KR101943635B1 - Thermal mass flow meter and Thermal mass flow measurement system - Google Patents

Abstract

The present invention relates to a thermal mass flowmeter capable of measuring the flow rate of a medium flowing through a pipe in a dry type without cutting the pipe and includes a heating device for heating at least a part of the internal medium of the pipe outside the pipe, Which is located at a first position in the direction in which the medium flows with respect to the heating apparatus, so that a temperature distribution according to a flow rate of the medium heated inside the pipe by the apparatus can be measured outside the pipe, A temperature measuring device and a heating device for measuring a temperature distribution according to a flow rate of the medium heated in the pipe inside the pipe, And a second temperature measuring device formed symmetrically with the first temperature measuring device.

Description

[0001] The present invention relates to a thermal mass flow meter and a thermal mass flow measurement system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal mass flow meter, and more particularly, to a thermal mass flow meter capable of measuring a flow rate of a medium flowing through a pipe without cutting a pipe.

In general, infusion pumps and syringe pumps are used as drug infusion pumps for small doses of medication in patients in hospitals. Although such a pump is used with its own calibration of each medical institution, it is being used in a different environment from the site where the drug is injected to the actual patient.

For example, in an actual patient's injection process, a drug delivery tube is branched to inject various drugs at the same time in order to simultaneously deliver various drugs. Also, although the internal pressure of the human body varies depending on the patient's condition and the temperature and pressure conditions of the operating room or the hospital room are different, these various conditions are not considered in the calibration of the medicine infusion pump due to practical limitations.

Therefore, there is a need for a flow meter that can monitor the actual drug dosage. When the drug injection amount can be monitored in real time, the injection amount can be sent to the medicine injection pump to control the feedback, thereby improving the accuracy of the medicine injection pump.

Flowmeters capable of monitoring these drug doses include a wet type that requires a pipe to be inserted and a flow meter inserted, and a dry type that can measure outside the pipe without cutting the pipe.

However, such a conventional wet type flow meter is limited in use because it is required to cut and install the piping, and thus it has not been able to be used to use a medicine infusion pump in actual hospitals. Further, in the conventional dry type flow meter, there is a dry ultrasonic flow meter as a method of measuring without cutting the piping from the outside. However, there is a problem that the ultrasonic flow meter has a limitation in measuring a drug having a minute flow rate in principle.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a clamp-on type pipe which can be easily attached to and detached from a pipe without cutting a pipe, And to provide a thermal mass flow meter capable of real-time monitoring of the flow rate of a drug injected into an actual patient, which can be used in various medical situations. However, these problems are exemplary and do not limit the scope of the present invention.

According to one aspect of the invention, a thermal mass flow meter is provided. The thermal mass flowmeter includes a heating device for heating at least a portion of the internal medium of the pipe outside the pipe; The heating device is formed at a first position in front of a direction in which the medium flows with respect to the heating device so that a temperature distribution according to a flow rate of the medium heated inside the pipe can be measured outside the pipe A first temperature measuring device; And a second position, which is located rearward of the heating device in a direction in which the medium flows, so that a temperature distribution according to a flow rate of the medium heated in the pipe by the heating device can be measured outside the pipe, And a second temperature measuring device formed symmetrically with the first temperature measuring device.

In the thermal mass flowmeter, the heating device may include a laser diverging device for emitting a laser so as to locally heat the medium inside the pipe.

In the thermal type mass flowmeter, the heating device includes a beam block installed so as to face the laser diverging device with respect to the pipe so that the laser emitted from the laser diverging device does not leak to the outside through the pipe .

In the thermal type mass flow meter, the first temperature measuring device may include: a first infrared ray emitting unit installed at the first position and irradiating the medium inside the pipe with a first infrared ray; And a first infrared ray receiving unit disposed opposite to the first infrared ray emitting unit on the basis of the pipe, for sensing the first infrared ray light passing through the medium.

In the thermal type mass flow meter, the second temperature measuring device may include: a second infrared ray emitting unit installed at the second position and irradiating the medium inside the pipe with a second infrared ray; And a second infrared ray receiving unit disposed opposite to the second infrared ray emitting unit based on the pipe, for sensing the second infrared ray passing through the medium.

Wherein a temperature distribution in accordance with a flow velocity of the medium heated inside the pipe by a heating device is provided at a third position in front of the direction in which the medium flows with reference to the first position in the thermal mass flowmeter, A third temperature measuring device for measuring the temperature of the third temperature sensor; And a temperature distribution in accordance with a flow rate of the medium heated inside the pipe by the heating device is measured at the outside of the pipe by a heater disposed at a fourth position behind the direction of flow of the medium with respect to the second position And a fourth temperature measuring device.

In the thermal mass flowmeter, the pipe may be a tube made of a transparent polymer material so that the first infrared light emitted from the first infrared light emitting portion and the second infrared light emitted from the second infrared light emitting portion can pass through. .

In the thermal type mass flow meter, the heating device may include a first heater part formed in a half-ring shape surrounding one side of the pipe and locally heating the pipe by heat resistance; And a second heater part formed to face the first heater part in a half ring shape surrounding the other side of the pipe to locally heat the pipe by heat resistance.

In the thermal mass flow meter, a first body having a first receiving groove portion surrounding one side of the pipe; And a second body formed with a second receiving groove for surrounding the other side of the pipe and being foldably coupled to the first body.

In the thermal mass flowmeter, the laser diverging device may be installed in the first receiving groove, and the beam block may be installed in the second receiving groove so as to face the laser diverging device.

In the thermal mass flow meter, the first infrared ray emitting portion and the second infrared ray emitting portion are provided in the first receiving groove portion, and the first infrared ray receiving portion and the second infrared ray receiving portion are disposed in the first infrared ray emitting portion and the second infrared ray receiving portion, And may be provided in the second receiving groove portion so as to face the infrared ray emitting portion.

In the thermal mass flowmeter, the first heater portion may be provided in the first receiving groove, and the second heater portion may be provided in the second receiving groove portion so as to face the first heater portion.

According to one aspect of the present invention, a thermal mass flow measurement system is provided. The thermal mass flow rate measuring system comprising: a heating device for heating at least a part of the internal medium of the pipe outside the pipe; The heating device is formed at a first position in front of a direction in which the medium flows with respect to the heating device so that a temperature distribution according to a flow rate of the medium heated inside the pipe can be measured outside the pipe A first temperature measuring device; And a controller for controlling the heating device so that a temperature distribution in accordance with a flow rate of the medium heated inside the pipe can be measured outside the pipe, A second temperature measuring device symmetrically formed with the first temperature measuring device; And a controller for receiving measurement data from the first temperature measuring device and the second temperature measuring device and measuring a temperature distribution around the heating device according to a flow rate of the medium to calculate a flow rate of the medium flowing through the pipe; . ≪ / RTI >

According to one embodiment of the present invention as described above, it is possible to easily attach and detach a pipe to a pipe in a clamp-on type without cutting a pipe, so that a doctor and a nurse can easily use the pipe, It is possible to monitor the flow rate of injected medicines in real time because it can be used in situations.

In addition, feedback control of the drug infusion pump using the flow rate value of the monitored drug can improve the performance of the drug infusion pump. Accordingly, it is possible to inject a medicine into the patient at an accurate injection amount and to realize a thermal mass flow meter capable of securing the stability of the patient. Of course, the scope of the present invention is not limited by these effects.

1 is a perspective view showing a thermal mass flowmeter according to an embodiment of the present invention.
Fig. 2 is a perspective view showing the thermal mass flowmeter of Fig. 1 clamped to a pipe. Fig.
3 is a cross-sectional view schematically showing the thermal mass flowmeter of FIG.
4 is a cross-sectional view schematically showing a thermal mass flowmeter according to another embodiment of the present invention.
5 is a cross-sectional view schematically showing a thermal mass flow meter according to another embodiment of the present invention.
FIGS. 6 and 7 are graphs showing spectra measured by a spectrometer using a halogen lamp according to temperature. FIG.
8 is a graph showing the intensity of a signal according to temperature at a main wavelength of an infrared LED (LED) in a temperature-dependent spectrum.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated" or "coupled to" another element, It will be appreciated that elements may be directly "on", "connected", "laminated" or "coupled" to another element, or there may be other elements intervening therebetween. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, it is interpreted that there are no other components intervening therebetween do. Like numbers refer to like elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, in the figures, when the element is turned over, the elements depicted as being on the upper surface of the other elements are oriented on the lower surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure. If the elements are oriented in different directions (rotated 90 degrees with respect to the other direction), the relative descriptions used herein can be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

1 is a perspective view illustrating a thermal mass flow meter 100 according to an embodiment of the present invention. 2 is a perspective view showing that the thermal mass flow meter 100 of FIG. 1 is clamped to the pipe T, and FIG. 3 is a cross-sectional view schematically showing the thermal mass flow meter 100 of FIG.

1, a thermal mass flow meter 100 according to an embodiment of the present invention includes a first body B1, a second body B2, a heating device 10, The first temperature measuring device 20 and the second temperature measuring device 30 may be included.

1, the thermal mass flow meter 100 includes a first body B1 in which a first receiving groove H1 surrounding a side of a pipe T is formed, and a second body B1 surrounding the other side of the pipe T And a second body B2 formed with a second receiving groove H2 and coupled to the first body B1 in a foldable manner.

More specifically, the first body B1 and the second body B2 are provided with the heating device 10, the first temperature measuring device 20 and the second temperature measuring device 30, It may be a structure having appropriate strength and durability. For example, the first body B1 and the second body B2 may be a structure selected from a material selected from the group consisting of steel, stainless steel, aluminum, magnesium, zinc, and synthetic resin. However, the first body B1 and the second body B2 are not necessarily limited to those shown in Fig. 1, and the heating device 10, the first temperature measuring device 20 and the second temperature measuring device 30 Members of a wide variety of materials that can be received and supported can be applied.

A hinge portion may be formed at the connection portion between the first body B1 and the second body B2 so that the second body B2 can be folded on the basis of the first body B1. In addition to the hinge portion, a folded portion formed of a thin synthetic resin or the like and easily foldable is formed between the first body B1 and the second body B2 so that the second body B2 can be folded B1). ≪ / RTI >

2, the first body B1 and the second body B2 of the thermal mass flow meter 100 according to an embodiment of the present invention are provided with a heating device 10, The second body B2 is folded on the basis of the first body B1 so that the second body B2 is easily folded on the clamp- (T), so that the physician and the nurse can easily guide the thermal mass flow meter 100 to use in the hospital.

3, the heating device 10 can heat at least a part of the internal medium of the pipe T outside the pipe T. [ More specifically, the heating apparatus 10 includes a laser divergence device 11 for diverging a laser L so as to locally heat the medium in the pipe T, and a laser divergence device 11 for emitting from the laser divergence device 11 And a beam block 12 installed so as to be opposed to the laser divergence device 11 with respect to the pipe T so as not to leak to the outside through the pipe T. [

At this time, the laser divergence device 11 is installed in the first receiving groove H1 of the first body B1, and the beam block 12 is provided in the second body B2 opposite to the laser divergence device 11 2 accommodating groove H2 so that the first body B1 and the second body B2 are folded so that the laser divergence device 11 and the beam block 12 can be opposed to each other in the pipe T during clamping. have.

Therefore, when the focal point of the laser L emitted from the laser divergence device 11 is irradiated to the inside of the pipe T and is irradiated to the pipe T, the above described medium in the pipe T is locally heated, The temperature at the local site can be rapidly increased. The beam block 12 provided opposite to the laser diverging device 11 with respect to the pipe T cuts off the pipeline T and the laser L passing through the medium so that the laser L is moved to the piping T to the outside.

3, the first temperature measuring device 20 is configured to measure the temperature distribution in accordance with the flow rate of the medium heated inside the pipe T from outside of the pipe T, And may be formed at a first position in front of the direction in which the medium flows with reference to the apparatus 10. The second temperature measuring device 30 is a device for measuring the temperature distribution of the medium T heated by the heating device 10 on the basis of the temperature of the medium T heated by the inside of the pipe T, And may be formed symmetrically with the first temperature measuring device 20 at a second position rearward of the direction in which the medium flows.

More specifically, the first temperature measuring device 20 is installed at the first position in the direction in which the medium flows with reference to the heating device 10, and the first infrared ray A first infrared ray emitting unit 21 for irradiating the light IR1 and a first infrared ray IR1 which are provided to face the first infrared ray emitting unit 21 with reference to the pipe T, And a first infrared ray receiving portion 22 for sensing the infrared ray.

The second temperature measuring device 30 is installed at the second position behind the heating device 10 in the direction in which the medium flows so that the second infrared light A second infrared ray emitting portion 31 for irradiating the second infrared ray IR2 and a second infrared ray emitting portion 31 for detecting the second infrared ray IR2 passing through the medium, And a second infrared ray receiving portion 32. [

The first infrared ray emitting unit 21 and the second infrared ray emitting unit 31 are installed in the first receiving groove H1 of the first body B1 and the first infrared ray receiving unit 22 and the second infrared ray receiving unit 31, The first infrared ray emitting portion 32 is provided in the second receiving groove portion H2 of the second body B2 so as to face the first infrared ray emitting portion 21 and the second infrared ray emitting portion 31, The first infrared ray emitting portion 21 and the second infrared ray emitting portion 31 and the first infrared ray receiving portion 22 and the second infrared ray receiving portion 32 are connected to each other when the two bodies B2 are folded and clamped to the pipe T, You can have them face each other.

At this time, the pipe T is connected to the laser L which is emitted from the laser divergence device 11, the first infrared ray IR1 of the first infrared ray emitting portion 21 and the second infrared ray IR2 of the second infrared ray emitting portion 31 And may be a tube formed of a transparent polymer material so that the infrared ray IR2 can pass easily.

The first infrared ray IR1 and the second infrared ray IR2 emitted from the first infrared ray emitting portion 21 and the second infrared ray emitting portion 31 are emitted by the laser L in the pipe T When the infrared ray passes through the heated medium, the degree of absorption of the infrared ray (IR1, IR2) by the medium is different depending on the temperature of the medium, and the temperature can be measured using the infrared ray.

A control unit (not shown) connected to the first temperature measuring apparatus 20 and the second temperature measuring apparatus 30 receives a sensing signal from the first infrared ray receiving unit 22 and the second infrared ray receiving unit 32, It is possible to calculate the flow rate of the medium flowing through the pipe T by measuring the temperature distribution around the pipe 10.

3, the temperature of the medium within one point of the pipe T is rapidly increased to a high temperature by the laser L emitted from the laser divergence device 11 . At this time, the temperature distribution caused by the high temperature difference can be measured by the first temperature measuring device 20 and the second temperature measuring device 30. Since the temperature distribution differs according to the flow rate of the medium flowing in the pipe T, the control unit can calculate and calculate the flow rate of the medium flowing through the pipe T using the temperature distribution.

Therefore, the thermal mass flow meter 100 according to the embodiment of the present invention can easily attach and detach the pipe T to the pipe T in a clamp-on type without cutting the pipe T dry, Physicians and nurses can easily use it and can be used in various medical situations in practice so that the flow rate of the medicine injected to the actual patient can be monitored in real time through the control unit.

In addition, feedback control of the drug infusion pump using the flow rate value of the monitored drug can improve the performance of the drug infusion pump. Accordingly, it is possible to implement a thermal mass flow meter 100 capable of injecting the medicine into the patient at an accurate injection amount and securing the stability of the patient.

4 is a cross-sectional view schematically showing a thermal mass flow meter 200 according to another embodiment of the present invention.

4, the thermal mass flow meter 200 according to another embodiment of the present invention is installed at a third position in front of the direction in which the medium flows with respect to the first position, A third temperature measuring device 40 for measuring the temperature distribution according to the flow rate of the medium heated inside the pipe T by the first temperature measuring device 40 outside the pipe T and a second temperature measuring device 40 for measuring the temperature The temperature distribution according to the flow rate of the medium heated inside the pipe T by the heating device 10 is provided to the pipe T in a symmetrical manner with the third temperature measuring device 40 at the fourth position, And a fourth temperature measurement device 50 for measuring the temperature of the second temperature measurement device 50 outside the first temperature measurement device 50.

Here, the third temperature measuring device 40 and the fourth temperature measuring device 50 are the same as the first temperature measuring device 40 of the thermal mass flow meter 100 according to the embodiment of the present invention shown in Figs. The configuration and the function of the second temperature measuring device 30 and the second temperature measuring device 30 may be the same. Therefore, detailed description is omitted.

The first infrared ray IR1 and the second infrared ray IR2 emitted from the first infrared ray emitting portion 21, the second infrared ray emitting portion 31, the third infrared ray emitting portion 41 and the fourth infrared ray emitting portion 51, When the infrared ray IR2, the third infrared ray IR3 and the fourth infrared ray IR4 pass through the medium heated by the laser L in the pipe T, (IR1, IR2, IR3, IR4) absorbed by the medium are different, and the temperature can be measured using the same.

Therefore, the thermal mass flow meter 200 according to another embodiment of the present invention is configured such that the control unit (not shown) controls the first infrared ray receiving unit 22, the second infrared ray receiving unit 32, the third infrared ray receiving unit 42, It is possible to more accurately calculate the flow rate of the medium flowing through the pipe T by measuring the temperature distribution around the heating device 10 in a wide area by receiving the sensing signal from the infrared ray receiving portion 52.

5 is a cross-sectional view schematically showing a thermal mass flow meter 300 according to another embodiment of the present invention.

5, the heating device 10 is formed in a half-ring shape surrounding one side of the pipe T in the first receiving groove portion H1 of the first body B1, The first heater portion 13 for locally heating the first heater portion 13 and the second receiving groove portion H2 of the second body B2 are formed in a half ring shape surrounding the other side of the pipe T, And a second heater unit 14 formed so as to locally heat the pipe T by thermal resistance.

Therefore, when a precise flow rate measurement value of the medium flowing through the pipe T is not required, it is possible to use the heater portions 13 and 14 which can locally heat the pipe T by thermal resistance, A thermal mass flow meter 300 may be implemented.

Hereinafter, an experimental example to which the technical idea described above is applied will be described in order to facilitate understanding of the present invention. It should be understood, however, that the following examples are for the purpose of promoting understanding of the present invention and are not intended to limit the scope of the present invention.

FIGS. 6 and 7 are graphs showing a result of measuring spectra according to temperature using a halogen lamp with a spectrometer. FIG. 8 is a graph showing the intensity of a signal according to temperature at a main wavelength of an infrared LED FIG.

In the present experimental example, a temperature-dependent spectrum was measured using a halogen lamp with a spectrometer for an experiment using infrared rays. The spectroscope used an Avantes spectrometer capable of measuring wavelengths from 200 nm to 1800 nm. The light of the halogen lamp is passed through an optical fiber tube which is transparent polymer material used for drug injection, and is connected to the spectroscope to be measured. The medium used was distilled water (DI water) and the temperature was measured in the media storage chamber before measurement.

FIGS. 6 and 7 show the spectral spectra measured according to the temperature of the distilled water. FIG. 8 shows signal intensity according to temperature at 780 nm, 850 nm and 940 nm, which are major wavelengths of commercially available infrared LEDs Respectively. As shown in FIG. 7, since the accuracy of temperature measurement is increased at a wavelength of 1,400 to 1,900 nm, it is advantageous to perform temperature measurement using infrared rays of this region. As shown in FIG. 8, As the temperature increases, it can be seen that the temperature of the medium flowing inside the pipe T can be measured by using it.

Accordingly, the thermal mass flow meter 100 according to the embodiment of the present invention can rapidly increase the temperature of the medium within a certain point of the pipe T to a high temperature with the laser L emitted from the laser divergence device 11 And the temperature distribution resulting from the high temperature difference can be measured by the first temperature measuring device 20 and the second temperature measuring device 30. [ Since the temperature distribution differs according to the flow rate of the medium flowing in the pipe T, the control unit can calculate and calculate the flow rate of the medium flowing through the pipe T using the temperature distribution.

Therefore, the thermal mass flow meter 100 according to an embodiment of the present invention can easily attach and detach to and from the piping T in a clamp-on type without cutting the piping T, The nurse can easily use it, and it can be used in various medical situations, so that the flow rate of the medicine injected to the actual patient can be monitored in real time through the control unit.

In addition, feedback control of the drug infusion pump using the flow rate value of the monitored drug can improve the performance of the drug infusion pump. Accordingly, it is possible to implement a thermal mass flow meter 100 capable of injecting the medicine into the patient at an accurate injection amount and securing the stability of the patient.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Heating device
20: first temperature measuring device
30: second temperature measuring device
40: third temperature measuring device
50: fourth temperature measuring device
T: Piping
B1: First body
B2: Second body
100, 200, 300: Thermal mass flowmeter

Claims (13)

A heating device for heating at least a part of the internal medium of the pipe outside the pipe;
Wherein the temperature of the medium around the heating device, which is heated inside the pipe by the heating device, is measured outside the pipe, A first temperature measuring device formed at a first position in front of the flowing direction;
Wherein the temperature of the medium around the heating device, which is heated inside the pipe by the heating device, is measured outside the pipe, A second temperature measuring device formed symmetrically with the first temperature measuring device at a second position behind the flowing direction;
A first body having a first receiving groove for surrounding one side of the pipe; And
And a second body formed with a second receiving groove portion surrounding the other side of the pipe and being foldably coupled with the first body,
Wherein the first temperature measuring device comprises:
A first infrared ray emitting portion installed at the first position of the first receiving groove portion and irradiating the medium inside the pipe with a first infrared ray light; And
And a first infrared ray receiving unit disposed opposite to the first infrared ray emitting unit with respect to the pipe in the second receiving groove for sensing the first infrared ray light passing through the medium,
Wherein the second temperature measuring device comprises:
A second infrared light emitting unit installed at the second position of the first receiving groove to irradiate the medium inside the pipe with a second infrared light; And
A second infrared ray receiving unit installed in the second receiving groove to face the second infrared ray emitting unit with respect to the pipe and sensing the second infrared ray passing through the medium;
/ RTI > mass flow meter. The method according to claim 1,
The heating device includes:
A laser diverging device for emitting a laser so as to locally heat the medium inside the pipe;
/ RTI > mass flow meter. 3. The method of claim 2,
The heating device includes:
A beam block installed opposite to the laser diverging device with respect to the pipe so that the laser emitted from the laser diverging device does not leak to the outside through the pipe;
/ RTI > mass flowmeter. delete delete The method according to claim 1,
And a temperature measuring unit for measuring a temperature distribution of the medium heated by the heating unit inside the pipe at a position outside the pipe, 3 Temperature measuring devices; And
And a fourth temperature measuring device that is installed symmetrically with the third temperature measuring device at a fourth position that is rearward of the direction of flow of the medium with respect to the second position, A fourth temperature measuring device for measuring a distribution outside the pipe;
/ RTI > mass flow meter. The method according to claim 1,
In the above-described piping,
Wherein the first infrared ray emitted from the first infrared ray emitting portion and the second infrared ray emitted from the second infrared ray emitting portion are transparent. The method according to claim 1,
The heating device includes:
A first heater part formed in a half ring shape surrounding one side of the pipe and locally heating the pipe by heat resistance; And
A second heater part which is formed in a half ring shape surrounding the other side of the pipe and which opposes the first heater part to locally heat the pipe by heat resistance;
/ RTI > mass flow meter. delete The method of claim 3,
Wherein the laser diverging device is installed in the first receiving groove, and the beam block is installed in the second receiving groove so as to face the laser diverging device. delete 9. The method of claim 8,
Wherein the first heater portion is provided in the first receiving groove portion and the second heater portion is provided in the second receiving groove portion so as to face the first heater portion. A heating device for heating at least a part of the internal medium of the pipe outside the pipe;
Wherein the temperature of the medium around the heating device, which is heated inside the pipe by the heating device, is measured outside the pipe, A first temperature measuring device formed at a first position in front of the flowing direction;
Wherein the temperature of the medium around the heating device, which is heated inside the pipe by the heating device, is measured outside the pipe, A second temperature measuring device formed symmetrically with the first temperature measuring device at a second position behind the flowing direction;
A controller for receiving measurement data from the first temperature measuring device and the second temperature measuring device and measuring a temperature distribution around the heating device according to a flow rate of the medium to calculate a flow rate of the medium flowing through the pipe;
A first body having a first receiving groove for surrounding one side of the pipe; And
And a second body formed with a second receiving groove portion surrounding the other side of the pipe and being foldably coupled with the first body,
Wherein the first temperature measuring device comprises:
A first infrared ray emitting portion installed at the first position of the first receiving groove portion and irradiating the medium inside the pipe with a first infrared ray light; And
And a first infrared ray receiving unit disposed opposite to the first infrared ray emitting unit with respect to the pipe in the second receiving groove for sensing the first infrared ray light passing through the medium,
Wherein the second temperature measuring device comprises:
A second infrared light emitting unit installed at the second position of the first receiving groove to irradiate the medium inside the pipe with a second infrared light; And
A second infrared ray receiving unit installed in the second receiving groove to face the second infrared ray emitting unit with respect to the pipe and sensing the second infrared ray passing through the medium;
Wherein the thermal mass flow measurement system comprises:

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