KR102275947B1 - Method for testing performance of fine dust measuring device at room temperature and high humidity environmental conditions - Google Patents

Abstract

A method for evaluating the performance of a simple fine dust measurement device in ambient temperature and high humidity environmental conditions is disclosed. The method includes the steps of connecting a reference measuring device to a sample tube, supplying clean air to the chamber using an air supply unit that supplies clean air that does not contain fine dust, and the count value of the connected reference measuring device fluctuates from a predetermined value Keeping the inside of the chamber clean for a predetermined time until it is maintained without it, connecting the fine dust simple measuring device to the sample tube, and controlling the moisture supply and temperature controller to set the inside of the chamber to room temperature and high humidity environment conditions , operating a blower to introduce test air containing fine dust into the chamber, until the range of change of the measured value of the standard measuring device and the measured value of the simple fine dust measuring device at room temperature and high humidity environment is within a predetermined value After the stabilization step and the measured value are stabilized, the performance evaluation of the fine dust measuring device is performed by comparing the measured value measured by the reference measuring device with the measured value measured by the fine dust measuring device at room temperature and high humidity environment conditions. comprising the steps of performing

Description

Method for evaluating the performance of a simple fine dust measuring device at room temperature and high humidity environment

The present invention relates to a performance evaluation method for evaluating the reliability of a simple fine dust measuring device in ambient temperature and high humidity environment conditions.

Fine dust is a suspended matter in the atmosphere with various complex components, and is called PM (Particulate Matter)10 with a diameter of less than 10㎛ (micrometer).

Most of it is emitted mainly through automobile exhaust gas or factory chimneys, and refers to small-sized dust that is blown out during yellow dust or heavy smog in China.

Among these fine dust, dust with a diameter of 2.5 μm or less is defined as PM 2.5, and because of its very small size, it cannot be filtered in the airways, and most of it penetrates into the alveoli, causing heart disease and respiratory diseases.

Such a method for measuring fine dust includes a manual measurement method and an automatic measurement method, the manual measurement method includes a gravimetric method, and the automatic measurement method includes a beta ray measurement method and a light scattering fine dust measurement method.

The gravimetric method, which is a manual measurement method, uses an impactor or cyclone method to separate fine dust (PM 10: particles smaller than 10 micrometers), collects the dust on a GFC (glass fiber filter) filter paper with a pore size of 2 micrometers or smaller, and then , to calculate the weight of pure dust using the weight before and after collection on the filter paper, and then calculate the total flow rate of collection.

The automatic measurement method, the beta-ray absorption method-based measurement method, uses an impactor or cyclone method to separate fine particles (PM10: particles less than 10 micrometers), collects dust in a filter, and then passes through a beta-ray source to measure transmittance and quantify this permeability by weight.

In the light scattering type fine dust measurement method, particles are supplied to an optical chamber, and when particles enter the optical chamber, the light irradiated from the light source meets the particles to create scattered light. The detector recognizes the scattered light refracted by 90 degrees and determines the size of the scattered light. The particle size is determined accordingly, and the number of scattered light is determined to measure the number of each particle size.

The weight collection method has the disadvantage that it is difficult to measure in real time, and there are a lot of errors due to external influences in the process of measuring the weight of filter paper before and after collection. It has the disadvantage of being expensive and the disadvantage that it may have a harmful effect on the human body due to the beta wire.

The light scattering fine dust measuring method has the advantage that it can measure fine dust in real time and is relatively inexpensive compared to other measuring methods. Currently, many manufacturers are manufacturing simple fine dust measuring devices using this light scattering fine dust measuring method. are doing

As such, a simple fine dust measuring device has been developed and used to easily and quickly measure air quality, but a method for accurately evaluating performance such as reliability and accuracy of the fine dust simple measuring device has not been proposed.

Accordingly, there is a need for a method for evaluating the performance of a simple fine dust measurement device.

The present invention has been devised in accordance with the above-mentioned necessity, and an object of the present invention is to provide a method for evaluating the performance of a simple fine dust measuring device in ambient temperature and high humidity environment conditions.

The method for evaluating the performance of a simple fine dust measuring device at room temperature and high humidity environment includes the steps of connecting the reference measuring device to the sample tube, and using an air supply unit that supplies clean air that does not contain fine dust to the chamber. supplying a, maintaining the inside of the chamber clean for a predetermined time until the count value of the connected reference measuring device is maintained at a predetermined value without change, connecting the simple fine dust measuring device to the sample tube; Controlling the moisture supply unit and the temperature control unit to set the inside of the chamber to room temperature and high humidity environment conditions, operating a blower to introduce test air containing fine dust into the chamber, and the standard in the room temperature and high humidity environment conditions performing stabilization of maintaining the measured value of the measuring device and the range of change of the measured value of the simple fine dust measuring device within a predetermined value, and when the measured value is stabilized, the reference measurement in the ambient temperature and high humidity environment conditions Comparing the measured value measured by the device with the measured value measured by the simple fine dust measuring device, the method may include performing performance evaluation on the simple fine dust measuring device.

In addition, the ambient temperature and high humidity environmental conditions may be a temperature of 18 ℃ ~ 20 ℃ and a humidity of 85 ~ 95%.

In addition, the performance evaluation device receives the fine dust aqueous solution from the air supply unit supplying clean air not containing fine dust, the fine dust aqueous solution supply unit supplying the fine dust aqueous solution, and the fine dust aqueous solution supply unit, and the supplied fine dust A particle generator for producing test air containing microscopic particles by using an aqueous solution, an input unit for receiving input values for room temperature and high humidity environmental conditions inside the chamber, and an input unit for receiving an input value for a humidity value input through the input unit inside the chamber It may further include a moisture supply unit for supplying moisture for controlling the humidity of and a temperature control unit for performing temperature control inside the chamber based on the temperature value input through the input unit, wherein the chamber receives clean air from the air supply unit. It is provided and the test air is provided from the particle generator, and mixed air in which the clean air and the test air are mixed may be generated.

In addition, the reference measuring device may be a beta-ray absorption method-based fine dust measuring device, and the fine dust simple measuring device may be a light scattering fine dust measuring device.

In addition, the performing of the performance evaluation may include: acquiring the measured value measured by the reference measuring device and the fine dust simple measuring device under the ambient temperature and high humidity environmental conditions; based on the obtained measured value The method may include calculating error distribution data for each humidity of the light scattering type fine dust measuring device, and performing performance evaluation on the simple fine dust measuring device based on the calculated error distribution data for each humidity.

In addition, the calculated error distribution data for each humidity may be used as a correction value of a measurement value of a simple fine dust measuring device used in the ambient temperature and high humidity environment conditions.

According to the present invention, since the light scattering type fine dust measuring device is greatly affected by the surrounding environment, in particular, humidity, by evaluating the performance of the measuring device at room temperature and high humidity conditions, the error-generating factor is identified in advance, and in a high-humidity environment It has the effect of evaluating whether the light scattering fine dust measuring device accurately measures fine dust in

In addition, according to the present invention, by evaluating in a high-humidity environment, it is possible to identify and improve the causes of errors in advance, thereby contributing to quality improvement of fine dust measuring devices and product competition, and light scattering fine dust measuring devices It can solve the difficulties that may occur in the actual field of use.

1 is a block diagram illustrating an apparatus for evaluating the performance of a simple fine dust measuring device according to an embodiment of the present invention.
2 is a view showing the measurement results of the fine dust measuring device according to the ambient humidity.
3 is an exemplary view illustrating an input unit and a moisture supply unit according to an embodiment of the present invention.
4 is a block diagram illustrating a light scattering type fine dust measuring device according to an embodiment of the present invention.
5 and 6 are flowcharts illustrating in detail a performance evaluation method of a simple fine dust measuring device according to an embodiment of the present invention.
7 is a block diagram illustrating an apparatus for evaluating the performance of a simple fine dust measuring device according to another embodiment of the present invention.

The following is merely illustrative of the principles of the invention. Therefore, those skilled in the art can devise various devices that, although not explicitly described or shown herein, embody the principles of the invention and are included in the spirit and scope of the invention. In addition, it should be understood that all conditional terms and examples listed herein are, in principle, expressly intended only for the purpose of understanding the inventive concept and are not limited to the specifically enumerated embodiments and states as such. .

The above-described objects, features and advantages will become more apparent through the following detailed description in relation to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the invention pertains will be able to easily practice the technical idea of the invention. .

In addition, in the description of the invention, if it is determined that a detailed description of a known technology related to the invention may unnecessarily obscure the gist of the invention, the detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a performance evaluation apparatus 1000 of a simple fine dust measuring device according to an embodiment of the present invention.

Referring to FIG. 1 , the performance evaluation device 1000 includes an air supply unit 100 , a fine dust aqueous solution supply unit 150 , a particle generator 200 , an input unit 250 , a moisture supply unit 300 , and a temperature control unit 350 . ), the chamber 500 and the discharge unit 550 may include some or all.

In addition, at least one simple fine dust measuring device 400-1, ..400-N: 400 that is a performance evaluation target may be connected to the performance evaluation device 1000 of the simple fine dust measuring device. Here, the simple fine dust measuring device 400 connected to the performance evaluation device 1000 may be a light scattering fine dust measuring device that measures the concentration of fine dust present in the air using the amount and/or number of scattered light.

In addition, a reference measuring device 450 serving as a standard for performance evaluation of the fine dust measuring device 400 may be connected to the performance evaluation device 1000 of the fine dust measuring device. Here, the reference measuring device 450 may be a fine dust measuring device based on a beta-ray absorption method.

The performance evaluation apparatus 1000 of the simple fine dust measuring device may perform a process for evaluating the performance of the simple fine dust measuring device 400 connected to the performance evaluation device 1000 . If a plurality of simple fine dust measuring devices 1000 are connected to the performance evaluation device 1000 of the simple fine dust measuring device, the performance evaluating device 1000 of the simple fine dust measuring device is connected to the plurality of simple fine dust measuring devices. It is also possible to perform a process for performance evaluation with respect to 400 at the same time.

Before describing the performance evaluation apparatus 1000 of the simple fine dust measuring device according to the present invention in detail, the terms used in this specification are defined as follows.

* Clean air: It refers to air that has been filtered with fine dust with a HEPA filter or an equivalent or higher filter.

* Test air: This is the air used to test the discrimination performance of the simple fine dust measuring device, and it means that fine dust of known diameter is suspended in dry clean air. Here, as the fine dust, polystyrene latex (PSL) particles may be used.

* Fine dust simple measuring device: This is a device subject to performance evaluation, which means a device that measures the concentration of fine dust by sucking air, converts the concentration of fine dust in the air into mass concentration, and records the result. The simple fine dust measuring device according to the present invention may be a light scattering fine dust measuring device.

* Standard measuring device: It is a device that serves as a standard for performance evaluation, and refers to a device that measures the concentration of fine dust by sucking air, converts the concentration of fine dust in the air into mass concentration, and records the result. The measurement result value of such a reference measuring device is compared with the result value measured by the simple fine dust measuring device, and may be used to determine the measurement accuracy of the simple fine dust measuring device according to the comparison. The reference measuring device according to the present invention may be a fine dust measuring device based on a beta-ray absorption method.

On the other hand, the air supply unit 100 of the performance evaluation apparatus 1000 of the simple fine dust measurement device according to the present invention may control the air pressure and then supply it to the particle generator 200 and the chamber 500 . Here, the air supply unit 100 filters fine dust using an air supply source (not shown) that receives air from the external atmosphere, etc., receives air from the air supply source, and filters fine dust using a HEPA filter, etc. It may include a clean air generator (not shown) for generating air.

The air supply unit 100 may control the pressure of the clean air generated by the clean air generating unit (not shown) and then supply it to the particle generating unit 200 and the chamber 500 . In particular, the air supply unit 100 may be connected to the upper chamber 500 to supply clean air to the chamber 500 .

The fine dust aqueous solution supply unit 150 may supply the fine dust aqueous solution containing fine dust particles to the particle generating unit 200 . Here, the fine dust aqueous solution supply unit 200 may include a fine dust aqueous solution receiving unit (not shown) containing the fine dust aqueous solution.

In addition, the fine dust aqueous solution supply unit 150 controls the discharge amount of the fine dust aqueous solution accommodating unit to supply the fine dust aqueous solution accommodated in the fine dust aqueous solution accommodating unit to the particle generating unit 200. A fine dust aqueous solution supply control unit (not shown) may include In this case, the fine dust aqueous solution supply control unit (not shown) may control the fine dust aqueous solution accommodating unit to supply the fine dust aqueous solution accommodated in the fine dust aqueous solution accommodating unit to the particle generating unit 200 according to a preset supply amount per hour.

The particle generating unit 200 may use the fine dust aqueous solution provided from the fine dust aqueous solution supply unit 150 to prepare test air in which fine dust particles are suspended. In addition, the particle generator 200 may be connected to the upper portion of the chamber 500 to supply the manufactured test air to the chamber 500 .

Here, the particle generator 200 may be composed of an air supply system (not shown), a spray system (not shown), and a dry dilution system (not shown).

Specifically, the air supply system of the particle generating unit 200 may receive clean air from the air supply unit 100 and supply air to the spray system and the dry dilution system. And, the spray system of the particle generating unit 200 may spray the fine dust aqueous solution provided from the fine dust aqueous solution supply unit 150 using a sprayer. And, the dry dilution system of the particle generating unit 200 supplies the gas from the air source to the aerosol mixing tube in the order of the cold and hot dryer, the drying tube, the filter flow meter, and the filter in a different path from the spray system, and to dry the fine particles sprayed by the atomizer. can

Accordingly, it is possible to prepare test air in which fine dust is suspended.

On the other hand, the chamber 500 means a sealed space with a standardized test room with performance for maintaining a constant pressure, temperature, humidity, and the like.

A blower for sending out test air in which fine dust particles are suspended may be installed at one end of the chamber 500 , and a clean air supply tube that delivers clean air from the air supply unit 100 to the chamber 500 is a blower. It can be installed in the center of the outlet. Accordingly, the chamber 500 receives clean air from the air supply unit 100 , and the test air in which fine dust particles are suspended from the particle generator 200 , and the clean air is supplied by the blower in the chamber 500 . It can be mixed with test air. Here, one end of the chamber 500 may be an upper portion of the chamber. Here, the blower has an open flow rate of about 1 to 5 m ³ per minute, and a closing static pressure of at least 50 Pa may be provided with a damper for controlling the flow rate.

The mixed air generated inside the chamber 500 may move from the upper end of the chamber 500 to the lower end of the chamber 500 .

Meanwhile, the interior of the chamber 500 according to the present invention may be set to room temperature and high humidity environment conditions. That is, since the simple fine dust measuring device (light scattering fine dust measuring device) is greatly affected by the surrounding environment, in particular, humidity, the performance evaluation device 1000 according to the present invention measures the inside of the chamber 500 at room temperature and high humidity. It is possible to evaluate the performance of the fine dust simple measuring device under the conditions.

2 is a view showing the measurement result of the fine dust measuring device according to the ambient humidity. Referring to FIG. 2 , (a) is a graph in which PM 2.5 is measured at every hourly interval using a reference measuring device, (b) is a graph showing the change in ambient humidity for each hour, and (c) is a simple fine dust This is a graph of PM 2.5 measured at hourly intervals using a measuring device.

Here, the reference measuring device is a beta-ray absorption method-based fine dust measuring device, which can measure the concentration of fine dust stably under any environmental conditions (especially, high-humidity environmental conditions).

Referring to FIG. 2( a ), it can be seen that the reference measuring device accurately measures the concentration of fine dust in the surrounding environment without being affected by the change in humidity as shown in FIG. 2( b ).

However, referring to FIG. 2(c) , it can be seen that the concentration of fine dust measured by the simple fine dust measuring device is greatly affected by humidity. That is, it can be seen that the concentration of fine dust measured through the fine dust simple measuring device increases as the humidity increases. This may occur because the simple fine dust measuring device cannot accurately separate the particle size in a high-humidity environment, and thus cannot properly determine moisture and fine dust.

As such, the fact that the difference between the measured value measured by the reference measuring device and the measured value measured by the simple fine dust measuring device in a high-humidity environmental condition is very large means that the value measured by the simple fine dust measuring device is likely to be an incorrect value. It means very high.

Accordingly, the performance evaluation apparatus 1000 according to the present invention sets the interior of the chamber 500 to room temperature and high humidity environment conditions for accurate performance evaluation of the simple fine dust measuring device, and evaluates the performance of the simple fine dust measuring device can be performed.

To this end, the performance evaluation apparatus 1000 according to the present invention may include an input unit 250 , a moisture supply unit 300 , and a temperature control unit 350 for setting room temperature and high humidity environment conditions inside the chamber 500 . have.

The input unit 250 may receive input values for ambient temperature and high humidity environment conditions inside the chamber 500 from a user. Here, the temperature and humidity values input through the input unit 250 may be used for the moisture supply unit 300 and the temperature control unit 350 . For example, the input unit 250 may input a temperature of 18° C. to 22° C. and a humidity of 80 to 95%, preferably a temperature of 20° C. and a humidity of 90%. In addition, the input unit 250 may also perform a function of displaying the current environmental conditions (temperature and humidity) of the chamber 500 . In this regard, referring to FIG. 3 , the input unit 250 may include a display indicating the temperature and humidity inside the chamber 500 as shown in FIG. 3B , and the humidity and temperature inside the chamber 500 . You can input the input value to adjust the value in analog or digital way.

The moisture supply unit 300 is a device for making pure or ultrapure water by removing impurities in the water. Based on the humidity value input through the input unit 250 , moisture is supplied for controlling the humidity inside the chamber 500 . function can be performed.

Specifically, the moisture supply unit 300 may include a configuration for producing pure or ultrapure water such as pre-filtration pressure, activated carbon filter, ion exchange device, ultraviolet light, etc., through which pure or ultrapure water can be manufactured, and the manufactured pure water Alternatively, ultrapure water may be provided to the chamber 500 and used to control humidity. In this regard, referring to FIG. 3 , the moisture supply unit 300 may include a display indicating the purity of water as shown in FIG. 3A , and may include a control button for adjusting the purity of water. Accordingly, the chamber 500 may receive pure or ultrapure water from the moisture supply unit 300 to adjust the internal humidity.

The temperature control unit 350 may perform temperature control in the chamber based on the temperature value input through the input unit 250 . For example, when a temperature value of 20°C is input through the input unit 250 , the temperature controller 350 may adjust the temperature so that the temperature inside the chamber 500 is maintained at 20°C.

Meanwhile, a plurality of sample tubes for connecting the reference measuring device 450 and the simple fine dust measuring device 400 may be installed at the other end of the chamber 500 . Here, the plurality of sample tubes have a smooth inner surface with a diameter that matches the air intake size of the standard measurement device 450 and the simple fine dust measurement device 400, and the length of the tube is within 1 m, and a part including the suction port is a chamber. It is located inside the 500 , and the remaining part may be located outside the chamber 500 .

In addition, the cross-sectional area of the suction port of each of the plurality of sample tubes may be the same. In addition, the material of the sample tube may be metal, glass, or a tube made of a synthetic resin that has no electrification and does not emit a plasticizer. In addition, the inlet of the sample tube is installed close to the center of the chamber 500 , and each arrangement constituting the plurality of sample tubes may be uniform but disposed close to each other.

Meanwhile, the discharge unit 550 may be connected to the lower portion of the chamber 500 to discharge the fluid introduced into the chamber 500 to the outside.

Specifically, a part of the mixed air in which the clean air introduced into the chamber 500, pure or ultrapure water, and test air containing fine dust particles is mixed moves to the lower part of the chamber 500 and is discharged to the outside through the discharge unit 550. can be emitted. Here, a filter (not shown) for filtering fine dust included in the mixed air may be installed in the discharge unit 550 , and the discharge unit 550 may discharge the air filtered through the fine dust to the outside.

In this process, the other part of the mixed air in which the clean air introduced into the chamber 500 and test air containing fine dust particles is mixed is passed through the sample tube installed in the inner center of the chamber 500 to become the standard for performance evaluation. It can move to the standard measuring device 450 and the fine dust simple measuring device 400 that is a performance evaluation target.

As such, some of the mixed air of the chamber 500 may move to the reference measuring device 450 through the sample tube installed in the inner center of the chamber 500 . The reference measuring device 450 may measure the concentration of fine dust from the mixed air collected through the sample tube inside the chamber 500 , convert the concentration of fine dust in the mixed air into a mass concentration, and record the result.

In addition, some of the mixed air of the chamber 500 may move to the simple fine dust measurement device 400 through the sample tube installed in the inner center of the chamber 500 . The simple fine dust measurement device 400 measures the concentration of fine dust from the mixed air collected through the sample tube inside the chamber 500, converts the concentration of fine dust in the mixed air into a mass concentration, and records the result. have.

In this case, the measurement result value of the reference measuring device 450 may be used as a reference for determining the accuracy of the result value measured by the simple fine dust measuring device 400 . That is, the measurement result of the reference measuring device 450 is compared with the result measured by the simple fine dust measuring device 400, and the performance of the simple fine dust measuring device 400 is evaluated according to the difference between the two result values. can

Meanwhile, the performance evaluation apparatus 1000 of the simple fine dust measuring device according to an embodiment of the present invention may further include a flow rate measuring unit (not shown) for measuring the flow rate of the mixed air inside the chamber 500 .

For example, the flow rate measuring unit may be implemented in a tube shape, and a portion having a flow rate measuring function may be located inside the chamber 500 , and the remaining portion may be located outside the chamber 500 . In addition, the portion having a flow rate measurement function located inside the chamber 500 may measure the flow rate of the fine dust mixed air moving from the upper end of the chamber 500 to the lower end of the chamber 500 .

The flow velocity value of the mixed air measured by the flow velocity measurement unit may be used as a performance evaluation index when evaluating the performance of the simple fine dust measuring device 400 or used as a value for setting an experimental environment.

As an example, the flow rate value, which is a reference when evaluating the performance of the simple fine dust measuring device 400 , and the flow rate value measured by the flow rate measuring unit are compared, and measured by the fine dust simple measuring device 400 and the reference measuring device 450 . It is possible to correct the concentration value based on the difference between the flow velocity values according to the comparison, and perform a performance evaluation on the fine dust simple measuring device 400 that is a performance evaluation target based on the corrected concentration value.

As another example, a blower inside the chamber 500 based on the difference between the flow rate value and the flow rate value measured by the flow rate measurement unit as a reference when evaluating the performance of the simple fine dust measurement device 400 . The flow rate of the mixed air can be adjusted by controlling the etc.

On the other hand, the simple fine dust measuring device 400 that is the performance evaluation target may be a light scattering type fine dust measuring device that measures the concentration of fine dust using the amount and number of scattered light. Such a light scattering type fine dust measuring device will be described in more detail with reference to FIG. 4 .

Referring to FIG. 4 , the light scattering type fine dust measuring device may include a light source unit 10 , a light guide unit 20 , a light detection unit 30 , and a processor 40 .

The light source unit 10 may emit light, and the light guide unit 20 may guide the light emitted from the light source unit 10 through a plurality of optical paths formed through the inside. In addition, the light detection unit 30 may detect the light passing through the light guide unit 20 . In addition, the processor 40 may calculate the concentration of fine dust from the detection data of the light detected by the light detection unit 30 .

Specifically, the light emitted from the light source unit 10 is scattered by dust particles in the scattering path, the light detection unit 30 detects the amount of scattered light, and the processor 40 based on the detected scattered light determines the concentration of fine dust. can be calculated.

On the other hand, the performance evaluation apparatus 1000 of the simple fine dust measuring device according to the present invention is based on the measurement values measured by the reference measuring device 450 and the fine dust simple measuring device 400, respectively, the performance of the fine dust simple measuring device The performance of the simple fine dust measurement device 400 connected to the evaluation device 1000 may be evaluated. This will be described in more detail with reference to FIGS. 5 and 6 .

5 to 6 are flowcharts illustrating in detail a method for evaluating the performance of a simple measuring device for fine dust according to an embodiment of the present invention.

5 to 6 , first, a reference measuring device 450 may be connected to one of a plurality of sample tubes ( S110 ). In this case, the remaining sample tubes may be removed from the chamber 500 except for the sample tube for connecting the reference measuring device 450 among the plurality of sample tubes.

Thereafter, clean air may be supplied to the chamber 500 ( S120 ). At this time, the blower in the chamber may not be operated and the amount of clean air may be maintained to be greater than the suction amount of the reference measuring device 450 .

Thereafter, the inside of the chamber 500 may be kept clean for a predetermined time until the count value of the reference measuring device 450 is maintained at a predetermined value (eg, 0 or a number close thereto) without change ( S130 ).

Thereafter, a sample tube for connecting the simple fine dust measuring device 400 among the plurality of sample tubes may be installed in the chamber 400, and the simple fine dust measuring device 400 may be connected to the sample tube (S140).

Thereafter, the inside of the chamber 500 may be set to a room temperature and high humidity environment by controlling the moisture supply unit and the temperature control unit (S150). Here, the room temperature and high humidity environment may be determined based on the humidity value and the temperature value input from the input unit 250, and the room temperature and high humidity environment may have a temperature of 18°C to 22°C and a humidity of 80 to 95%.

Thereafter, by operating the blower, the test air containing fine dust may be introduced into the chamber 500 (S160).

Thereafter, the range of change of the measured value of the reference measuring device 450 and the range of change of the measured value of the simple fine dust measuring device 400 at room temperature and high humidity environment conditions are maintained until within a predetermined value (eg, 5%) stabilization can be performed (S170).

Thereafter, the performance evaluation of the simple fine dust measuring device 400 is performed by comparing the measured values measured by the standard measuring device 450 and the fine dust simple measuring device 400 in a room temperature and high humidity environment. can be (S180). In this case, performing the performance evaluation ( S180 ) may control the temperature within the temperature condition range corresponding to the room temperature and high humidity environmental conditions, adjust the humidity within the humidity condition range, and perform the performance evaluation.

Specifically, the performance evaluation step ( S180 ) may include a step ( S210 ) of obtaining a measurement value measured by the reference measurement device 450 and a measurement value measured by the simple fine dust measurement device 400 . Here, the measured value measured by the reference measuring device 450 and the measured value measured by the simple fine dust measuring device 400 may be the fine dust concentration value. In addition, the measured value measured by the reference measuring device 450 and the measured value measured by the fine dust simple measuring device 400 adjust the temperature within the temperature condition range corresponding to the room temperature and high humidity environmental conditions, and As the measured value while controlling the humidity, the value may be measured for each temperature and humidity.

In addition, the performance evaluation step ( S180 ) may include a step ( S220 ) of calculating error distribution data for each humidity of the light scattering type fine dust measuring device 400 based on the obtained measurement value.

As an example, the step of calculating the data ( S220 ) may include the measurement value of fine dust for each humidity of the reference measuring device 450 and the simple fine dust measuring device 400 in a predetermined range of humidity (eg, 80 to 95%) environment. By calculating the difference between the measured values for each humidity, and calculating the distribution of the calculated error, it is possible to calculate the error distribution data for each humidity. As an example, error distribution data for each humidity as shown in Table 1 below may be calculated.

Humidity 85 86 87 88 89 90 reference measuring instrument 40.1 40 40.2 40.2 40.3 40.2 Simple dust measuring device 1 80.1 85 90 98.2 105 120 error data 40 45 49.8 58 64.7 79.8 Simple dust measuring device 2 60.1 61 62.5 65 68 60 error data 20 21 22.3 24.2 28.3 29.8

In addition, the performance evaluation step ( S180 ) may include a step ( S230 ) of performing a performance evaluation on the light scattering type fine dust measuring device 400 based on the calculated error distribution data for each humidity.

Specifically, in the step of performing the performance evaluation based on the error distribution data for each humidity ( S230 ), the performance evaluation may be performed based on at least one of a deviation and an error size of the error distribution data for each humidity. As an example, the smaller the deviation of the error distribution data and the smaller the error size, the higher the performance of the light scattering type fine dust measuring device 400 may be evaluated. As another example, the greater the deviation of the error distribution data and the greater the error size, the lower the performance of the light scattering type fine dust measuring device 400 may be evaluated.

On the other hand, the performance evaluation step (S170) further includes the step of calculating the sampling accuracy value based on the flow rate value of the mixed air inside the chamber 500 measured by the flow rate measuring unit after the step (S210) of obtaining the measured value. may include Specifically, the step of calculating the sampling accuracy value may be calculated by dividing the absolute value of the difference between the flow rate value, which is a reference for performance evaluation, and the flow rate value measured by the flow rate measuring unit by the flow rate value measured by the flow rate measuring unit. . In addition, the measurement value measured by the simple fine dust measurement device 400 and the measurement value measured by the reference measurement device 450 may be corrected based on the calculated sampling accuracy value.

In this case, the step of calculating the error distribution data ( S220 ) is a correction value of the measurement value measured by the simple fine dust measurement device 400 and the correction value of the measurement value measured by the reference measurement device 450 , the error distribution data can be calculated.

Meanwhile, the error distribution data for each humidity calculated in the step of calculating the data ( S220 ) may be used as a correction value of a measurement value of a simple fine dust measuring device used in ambient temperature and high humidity environment conditions. As an example, the error distribution data for each humidity calculated in the step of calculating data ( S220 ) may be stored in the memory of “A fine dust simple measuring device” for which the performance evaluation is performed through the performance evaluation device 1000, and “A” The "fine dust simple measuring device" may be provided with a humidity measuring means. In this case, when measuring fine dust using "A simple dust measuring device" in a high-humidity environment, "A simple fine dust measuring device" corrects the measured value using the error distribution data for each humidity stored in the memory. It is possible to measure the fine dust concentration value in the measurement area.

On the other hand, the performance evaluation method of the simple fine dust measuring device according to an embodiment of the present invention according to FIG. 7 may be implemented as a computer program, and the performance evaluation apparatus 1000 of the fine dust measuring device according to the present invention is the corresponding program. can be used to automatically perform the performance evaluation method of a simple fine dust measurement device. This will be described in more detail with reference to FIG. 7 .

7 is a block diagram illustrating an apparatus 1000 for evaluating the performance of a simple fine dust measuring device according to another embodiment of the present invention. Referring to FIG. 7 , the performance evaluation apparatus of the simple fine dust measurement device may further include a processor 600 , a memory 650 , and a display unit 700 .

The memory 650 may store various programs for the operation of the performance evaluation device 1000 of the fine dust measuring device, and for example, a computer program for performing the performance evaluation method of the simple fine dust measuring device according to FIG. 6 . can be saved

Here, the memory 650 is a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable and programmable ROM (EEPROM), a register, a hard disk, a removable disk, and a memory card. , a storage device in a built-in type such as a Universal Subscriber Identity Module (USIM), etc., as well as a storage device in a removable type such as a USB memory, may be implemented.

The processor 600 acquires the measured value measured by the reference measuring device 450 and the measured value measured by the simple fine dust measuring device 400, and based on the obtained measured value, It is possible to calculate error distribution data for each humidity, and to perform performance evaluation on the fine dust simple measuring device 400 that is a performance evaluation target.

Meanwhile, the display unit 700 may display a result of evaluating the performance performed by the processor 600 on the screen.

According to the present invention, since the light scattering type fine dust measuring device is greatly affected by the surrounding environment, in particular, humidity, by evaluating the performance of the measuring device at room temperature and high humidity conditions, error occurrence factors are identified in advance, and high humidity It has the effect of evaluating whether the light scattering fine dust measuring device accurately measures fine dust in the environment.

In addition, according to the present invention, by evaluating in a high-humidity environment, it is possible to identify and improve the causes of errors in advance, thereby contributing to quality improvement of fine dust measuring devices and product competition, and light scattering fine dust measuring devices It can solve the difficulties that may occur in the actual field of use.

On the other hand, in the specification and claims, terms such as "first", "second", "third", and "fourth", if any, are used to distinguish between similar elements, although this is not necessarily the case. Used to describe a specific sequence or sequence of occurrences. It will be understood that the terms so used are interchangeable under appropriate circumstances to enable the embodiments of the invention described herein to operate, for example, in sequences other than those shown or described herein. Likewise, where methods are described herein as including a series of steps, the order of those steps presented herein is not necessarily the order in which those steps may be performed, and any described steps may be omitted and/or Any other steps not described may be added to the method.

Also, terms such as "left", "right", "front", "behind", "top", "bottom", "above", "below" in the specification and claims are used for descriptive purposes, It is not necessarily intended to describe an invariant relative position. It will be understood that the terms so used are interchangeable under appropriate circumstances to enable the embodiments of the invention described herein to operate otherwise than, for example, as shown or described herein. As used herein, the term “connected” is defined as being directly or indirectly connected in an electrical or non-electrical manner. Objects described herein as being "adjacent" to one another may be in physical contact with one another, in proximity to one another, or in the same general scope or area as appropriate for the context in which the phrase is used. The presence of the phrase “in one embodiment” herein refers to the same, but not necessarily, embodiment.

In addition, in the specification and claims, references to 'connected', 'connecting', 'fastened', 'fastening', 'coupled', 'coupled', etc. It is used in the sense of being connected or indirectly connected through other components.

In addition, the suffixes "module" and "part" for the components used in this specification are given or mixed in consideration of the ease of writing the specification, and do not have distinct meanings or roles by themselves.

In addition, the terms used herein are for the purpose of describing the embodiments and are not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, 'comprise' and/or 'comprising' means that a referenced component, step, operation and/or element is the presence of one or more other components, steps, operations and/or elements. or addition is not excluded.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions are possible within the range that does not depart from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. will be.

Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: air supply unit 150: fine dust aqueous solution supply unit
200: particle generation unit 250: input unit
300: moisture supply 350: temperature control unit
400: simple fine dust measuring device 450: standard measuring device
500: chamber 550: discharge part
600: processor 650: memory
700: display

Claims (6)

In the method for evaluating the performance of a simple fine dust measuring device under ambient temperature and high humidity environmental conditions,
The performance evaluation device includes a chamber and a plurality of sample tubes installed in the chamber to which a standard measuring device serving as a criterion for performance evaluation and a fine dust simple measuring instrument serving as a performance evaluation target are connected,
The performance evaluation method is
connecting the reference measuring device to the sample tube;
supplying clean air to the chamber by using an air supply unit that supplies clean air not containing fine dust;
maintaining the chamber clean for a predetermined time until the count value of the connected reference measuring device is maintained at a predetermined value without change;
connecting the simple fine dust measuring device to the sample tube;
controlling the moisture supply unit and the temperature control unit to set the inside of the chamber to room temperature and high humidity environment conditions;
operating a blower to introduce test air containing fine dust into the chamber;
performing stabilization maintaining until the range of change of the measured value of the reference measuring device and the measured value of the simple fine dust measuring device is within a predetermined value under the ambient temperature and high humidity environmental conditions; and
When the measured value is stabilized, performing a performance evaluation on the simple fine dust measuring device by comparing the measured value measured by the reference measuring device with the measured value measured by the fine dust simple measuring device under the ambient temperature and high humidity environmental conditions including;
Humidity of the high humidity environment condition is 80 ~ 95%,
The step of performing the performance evaluation,
obtaining a measurement value for each humidity of the reference measuring device and the simple fine dust measuring device by controlling the humidity within the humidity condition range;
measuring a flow velocity value of the mixed air inside the chamber using a flow velocity measuring unit;
calculating a sample collection accuracy value by comparing the flow rate value as a reference in the performance evaluation with the flow rate value measured by the flow rate measuring unit;
correcting the measurement values for each humidity of the simple fine dust measurement device and the reference measurement device based on the calculated sample collection accuracy value;
calculating a difference between the measured value for each humidity of the corrected reference measuring device and the measured value for each humidity of the corrected simple fine dust measuring device, and calculating error distribution data for each humidity based on the calculated difference;
Performance evaluation method of a simple fine dust measuring device comprising a; performing a performance evaluation of the fine dust simple measuring device based on at least one of the size of the error and the deviation of the error distribution data for each humidity calculated. The method of claim 1,
A performance evaluation method for a simple fine dust measuring device, characterized in that the temperature is 18°C to 22°C in room temperature and high humidity environment conditions. 3. The method of claim 2,
The performance evaluation device,
an air supply unit that supplies clean air that does not contain fine dust;
Fine dust aqueous solution supply unit for supplying the fine dust aqueous solution;
a particle generating unit that receives the fine dust aqueous solution from the fine dust aqueous solution supply unit and produces test air containing fine dust particles using the supplied fine dust aqueous solution;
an input unit for receiving input values for room temperature and high humidity environment conditions inside the chamber;
a moisture supply unit for supplying moisture for humidity control in the chamber based on the humidity value input through the input unit; and
Further comprising; a temperature control unit for performing temperature control inside the chamber based on the temperature value input through the input unit;
The chamber receives clean air from the air supply unit, receives test air from the particle generator, and generates mixed air in which the clean air and the test air are mixed. Performance evaluation of a simple measuring device for fine dust Way. According to claim 1,
The reference measuring device is a beta-ray absorption method-based fine dust measuring device,
The simple fine dust measuring device is a performance evaluation method of the fine dust simple measuring device, characterized in that the light scattering fine dust measuring device. delete According to claim 1,
The calculated error distribution data for each humidity is used as a correction value for the measurement value of the simple fine dust measurement device used in the ambient temperature and high humidity environment conditions.

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