CN103969210A - Open type CO2/H2O monitoring device based on non-dispersive infrared principle - Google Patents
Open type CO2/H2O monitoring device based on non-dispersive infrared principle Download PDFInfo
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- CN103969210A CN103969210A CN201410206898.8A CN201410206898A CN103969210A CN 103969210 A CN103969210 A CN 103969210A CN 201410206898 A CN201410206898 A CN 201410206898A CN 103969210 A CN103969210 A CN 103969210A
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Abstract
The invention discloses an open type CO2/H2O monitoring device based on a non-dispersive infrared principle. An infrared light emitted by an infrared light source is focused through a paraboloid reflector so as to concentrate energy; after being reflected by a 45-degree reflector, the reflected light is fixed on a narrow bandpass filter on a wave chopping wheel to be filtered, then the filtered light is subjected to collimation through a collimating lens, the light beam enters an open atmosphere path, emitted light is absorbed by gas molecules to be detected, the unabsorbed light continues to be spread along the original direction, and the light beam is focused to the surface of a light detector through a focusing lens. According to a Lambert-Beer law, the intensity of the light signals passing through the gas to be detected is attenuated, and the attenuation degree is related to the concentration of the gas to be detected. The device can be used for monitoring low-concentration CO2 and low-concentration H2O in an atmospheric environment and the gas to be detected does not need to be preprocessed.
Description
Technical field
The present invention relates to a kind of open type CO based on Non-Dispersive Infra-red (NDIR) principle
2/ H
2o monitoring device, belongs to Greenhouse technical field.
Background technology
In recent years, CO
2concentration is the important parameter that many fields need Real-Time Monitoring and analysis.Along with the pay attention to day by day of people to environmental protection, to CO in atmosphere
2gas, H
2o concentration is carried out Quantitative Monitoring and has been become growing demand with control.At present, the fast monitoring technique of gas concentration, monitoring method be according to the difference of tested gas property, actual monitoring condition, monitoring accuracy and different, most of CO
2monitor is all only suitable for high concentration CO
2the monitoring of gas, and to CO in environment
2the monitoring accuracy of gas is but very low.Therefore, need to design a kind of quick CO that can adapt to relative low concentration environment in atmosphere
2, H
2o analytical instrument, is convenient under specific environment, carry out concentration monitor, and ensures the degree of accuracy of its work.
Traditional non-spectral technique was once widely used in the monitoring of atmospheric pollution composition, but their general sensitivity is not high, and measuring accuracy is lower, corresponding speed is slower, less stable, carries inconvenience, and can not carry out real-time atmospheric gas monitoring.The feature of infrared gas analysis method is to measure multiple gases simultaneously, and measurement range is wide, and precision is high, can analyze continuously and realize automatic control.The method is the main method of current important dusty gas monitoring, in existing monitoring device, conventionally there are one or more airtight air chambers, the design of air chamber not only will be considered the length of air chamber, the longer the better for air chamber in theory, but in fact air chamber length is subject to the restriction of factors, but also must consider the character of gas to be measured, select material and the smooth finish of air chamber.Usually, for airtight air chamber also must be dried gas to be measured, the pre-service such as constant temperature.The analyser of mentioning in patent CN102183482A can be measured CO
2and H
2the concentration of O, but it adopts airtight air chamber, need to, to air chamber inside spray resistant material, increase the cost of manufacturing, and for fear of condensing of steam in gas to be measured, need to carry out heating pretreatment to gas to be measured, has increased pretreated difficulty.
Summary of the invention
The object of the invention is: overcome the deficiencies in the prior art, the CO of the open type based on Non-Dispersive Infra-red (NDIR) principle is provided
2/ H
2o monitoring device, can be used under relative low concentration environment and carry out CO
2and H
2the Quick Measurement of O concentration, and temporal resolution is high.
In order to achieve the above object, the technical solution adopted in the present invention is: a kind of open type CO based on Non-Dispersive Infra-red (NDIR) principle
2/ H
2o monitoring device, it is characterized in that comprising: infrared light supply 1, parabolic mirror 2, shell 3,4,45 ° of catoptrons 5 of motor, chopper wheel 6, optical filter 7, collimation lens 8, the first window 9, gas light path 10, the second window 11, condenser lens 12 and photo-detector 13; Described motor 4 is used for driving chopper wheel 6; Described chopper wheel 6 is uniformly-spaced evenly distributed with four through holes along circumference, is separately installed with optical filter 7 in through hole, and described optical filter 7 is respectively and can sees through CO
2the bandpass filter of absorbent infrared signal light, see through H
22 bandpass filters of the bandpass filter of the absorbent infrared signal light of O and the absorbent infrared signal light of reference gas; The infrared light that infrared light supply 1 is launched, focus on through parabolic mirror 2, make energy more concentrated, after the catoptrons of 45 ° 5 reflections, see through by chopper wheel 6 optical filter 7 selectivity above, after collimation lens 8 collimations, enter gas light path 10 by the first window 9, emergent light is absorbed by gas molecule to be measured, absorption portion does not continue to propagate according to former direction, final beam focuses on photo-detector 13 surfaces by the second window 11 by condenser lens 12, and light signal is converted to electric signal by photo-detector 13.
Described infrared light supply 1 is heat radiation type infrared light supply, and radiation wavelength scope is from visible ray to 5 μ m.
Described chopper wheel 6 is aviation titanium material; Described shell 3 is metal; In infrared light supply 1 and the motor 4 betal can space in a sealing; The junction of betal can all adopts the sealing of O RunddichtringO, is used for outside air completely isolated.
Described motor 4 is DC brushless motor.
Described optical filter 7 is silicon chip material, is narrow band pass filter, and centre wavelength is respectively 4.26 μ m, 2.9 μ m, 3.95 μ m, 3.95 μ m, respectively with CO
2, H
2the absorbing wavelength of O and reference gas is corresponding.
Described the first window 9 and the second window 11 are sapphire material.
2 and 45 ° of catoptron 5 materials of described parabolic mirror are K9 glass, and are coated with golden reflectance coating, and reflectivity reaches more than 98%.
Described collimation lens 8 and condenser lens 12 are calcium fluoride material, and are coated with anti-reflection film, and transmitance reaches more than 90%.
Described gas light path 10 is one section of open gas light path.
Described photo-detector 13 is for carrying the single channel PbSe infrared detector of optical filter.
The present invention compared with prior art has the following advantages:
(1) the present invention adopts the optical path of open type, is exposed to completely in air, without the complicated air chamber of design, carries out pre-service without gas, can be used in atmosphere and relatively under low concentration environment, carry out CO
2and H
2the measurement of O concentration.
(2) chopper wheel of the present invention, by driven by Brush-Less DC motor, has realized the Quick Measurement to gas concentration.
(3) compact conformation of the present invention, easy to maintenance, is suitable for field test.
Brief description of the drawings
Fig. 1 is the schematic diagram of apparatus of the present invention;
Fig. 2 is the index path of apparatus of the present invention;
Fig. 3 is this chopper wheel structural representation.
Embodiment
As shown in Figure 1, a kind of open type CO based on Non-Dispersive Infra-red (NDIR) principle
2/ H
2o monitoring device schematic diagram, comprises that infrared light supply 1, parabolic mirror 2, shell 3,4,45 ° of catoptrons 5 of motor, chopper wheel 6, optical filter 7, collimation lens 8, the first window 9, gas light path 10, the second window 11, condenser lens 12 and photo-detector 13 form.Be one section of parallel light path in order to ensure gas light path 10, infrared light supply 1 is positioned at the focus inner side of parabolic mirror, 45 ° of catoptron 5 installation sites and parabolic mirror angle at 45 °, motor 4 is arranged on same axis with chopper wheel 6, optical filter 7 is arranged in chopper wheel 6, and be positioned at the focus place of collimation lens 8, collimation lens 8, the first window 9, the second window 11 and condenser lens 12 are arranged on same axis, photo-detector 13 is arranged on condenser lens 12 focus places, and above-mentioned parts are installed on shell 3 except optical filter 7.
As shown in Figure 2, the infrared light that infrared light supply 1 is launched, focus on through parabolic mirror 2, make energy more concentrated, after 5 reflections of 45 ° of catoptrons, see through by optical filter 7 selectivity, after collimation lens 8 collimations, enter gas light path 10 by the first window 9, emergent light is absorbed by gas molecule to be measured, and absorption portion does not continue to propagate according to former direction, and final beam focuses on photo-detector 13 surfaces by the second window 11 by condenser lens 12.Such light path design not only can increase light intensity, and can make open gas light path have the high depth of parallelism.
As shown in Figure 3, the thickness of chopper wheel 6 is 0.1mm, and its edge has 127 grooves, wherein has 126 sulculuses to be uniformly distributed, and groove gap angle is 2.8125 degree, and has a large short slot, large short slot to utilize optocoupler location, determines a monitoring periods.Chopper wheel 6 is uniformly-spaced evenly distributed with four through holes along circumference, is separately installed with optical filter 7 in through hole, and optical filter 7 orders are: CO
2, with reference to, with reference to, H
2o.
Mid-infrared light source 1 of the present invention adopts a kind of heat radiation type infrared light supply, the infrared signal that infrared light supply 1 produces, and wavelength coverage can expand to from visible ray 5 μ m of infrared region, can cover CO
2, H
2the infrared absorption band of O and reference gas.
In the present invention, the material of 2 and 45 ° of catoptrons 5 of parabolic mirror is K9 glass, and is coated with golden reflectance coating, and reflectivity can reach more than 98%; Collimation lens 8 and condenser lens 12 are calcium fluoride material, and are coated with anti-reflection film, and transmitance can reach more than 90%.
In the present invention, the first window 9 and the second window 11 adopt sapphire material, very durable and can resist cut.
In the present invention, chopper wheel 6 adopts aviation titanium material, adopt driven by Brush-Less DC motor, can realize to gas concentration continuously, in real time measure.
In mid-infrared light source 1 of the present invention and the DC brushless motor 4 betal can space in a sealing, the junction of the shell 3 of metal (embodiment of the present invention employing aluminium material) all adopts the sealing of O RunddichtringO, is used for outside air completely isolated.In betal can space, be placed with ascarite and magnesium perchlorate, be used for respectively absorbing the CO in betal can
2and H
2o, can effectively control light path like this, reduces measuring error.
In the present invention, the parameter of optical filter 7 is selected, according to gas to be measured: CO
2and H
2the infrared absorption characteristic of O is considered minimum intersection interference and high-absorbility simultaneously, the parameter of the optical filter in each passage is selected, wherein CO
2: 4.26 μ m, H
2o:2.9 μ m, reference 3.95 μ m.In order to improve the precision of measurement, adopt two reference channels, one as CO
2reference channel, one as H
2the reference channel of O.
The present invention adopts one section of open gas light path 10, is exposed to completely in air, need not carry out pre-service to gas, can make aerodynamics disturb and reach minimum, can high frequency response CO
2and H
2o gas concentration changes, and can directly carry out automatic on-line and monitor continuously, has improved monitoring sensitivity.
Detector 13 in the present invention adopts the single channel PbSe infrared detector that carries optical filter.This detector wavelength band is 1-4.5 μ m, has covered CO
2, H
2the absorbing wavelength of O and reference gas, and this detector has high stability under limiting case, and the life-span is long, and the optical filter carrying can be avoided the interference of extraneous parasitic light.
Ultimate principle of the present invention is: in the time that infrared light passes through gas to be measured, these gas molecules absorb the infrared light of its characteristic frequency, and its absorption relation is obeyed lambert-Bill (Lambert-Beer) law.Its substance is: for a certain specific gas component, absorption coefficient is a constant constant, and emergent light light intensity is only to be determined by the concentration of gas, and formula is as follows:
In formula, the concentration that C is gas to be measured, I is that infrared light passes through the transmitted light intensity after gas absorption, I
0for infrared light is by the incident intensity before gas to be measured, α is the absorption coefficient of gas to a certain specific wavelength infrared radiation, and L is that gas obtains active path length.
From above formula, the concentration C of gas to be measured and output intensity I, the absorption coefficient of gas, and effective light path L that infrared light passes through is relevant.Emergent light intensity is less, and the absorption coefficient of gas is larger, and effectively light path is longer, light intensity decays faster, and the concentration of gas to be measured is larger.The absorption coefficient of gas depends on the characteristic of gas itself, and the absorption coefficient that different gas is corresponding is also different.
Non-elaborated part of the present invention belongs to techniques well known.The above; be only part embodiment of the present invention, but protection scope of the present invention is not limited to this, in the technical scope that any those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
Claims (10)
1. the open type CO based on Non-Dispersive Infra-red (NDIR) principle
2/ H
2o monitoring device, it is characterized in that comprising: infrared light supply (1), parabolic mirror (2), shell (3), motor (4), 45 ° of catoptrons (5), chopper wheel (6), optical filter (7), collimation lens (8), the first window (9), gas light path (10), the second window (11), condenser lens (12) and photo-detector (13), described motor (4) is used for driving chopper wheel 6, described chopper wheel (6) is uniformly-spaced evenly distributed with four through holes along circumference, is separately installed with optical filter (7) in through hole, and described optical filter (7) is respectively and can sees through CO
2the bandpass filter of absorbent infrared signal light, see through H
2(2) individual bandpass filter of the bandpass filter of the absorbent infrared signal light of O and the absorbent infrared signal light of reference gas, the infrared light of infrared light supply (1) transmitting, focus on through parabolic mirror (2), make energy more concentrated, after the catoptrons of 45 ° (5) reflection, see through by chopper wheel (6) optical filter (7) selectivity above, after collimation lens (8) collimation, enter gas light path (10) by the first window (9), emergent light is absorbed by gas molecule to be measured, absorption portion does not continue to propagate according to former direction, final beam focuses on photo-detector (13) surface by the second window (11) by condenser lens (12), light signal is converted to electric signal by photo-detector (13).
2. the open type CO based on Non-Dispersive Infra-red (NDIR) principle according to claim 1
2/ H
2o monitoring device, is characterized in that: described infrared light supply (1) is heat radiation type infrared light supply, and radiation wavelength scope is from visible ray to 5 μ m.
3. the open type CO based on Non-Dispersive Infra-red (NDIR) principle according to claim 1
2/ H
2o monitoring device, is characterized in that: described chopper wheel (6) is aviation titanium material; Described shell (3) is metal; In infrared light supply (1) and the betal can space of motor (4) in a sealing; The junction of betal can all adopts the sealing of O RunddichtringO, is used for outside air completely isolated.
4. the open type CO based on Non-Dispersive Infra-red (NDIR) principle according to claim 1
2/ H
2o monitoring device, is characterized in that: described motor (4) is DC brushless motor.
5. the open type CO based on Non-Dispersive Infra-red (NDIR) principle according to claim 1
2/ H
2o monitoring device, is characterized in that: described optical filter (7) is silicon chip material, is narrow band pass filter, and centre wavelength is respectively 4.26 μ m, 2.9 μ m, 3.95 μ m, 3.95 μ m, respectively with CO
2, H
2the absorbing wavelength of O and reference gas is corresponding.
6. the open type CO based on Non-Dispersive Infra-red (NDIR) principle according to claim 1
2/ H
2o monitoring device, is characterized in that: described the first window (9) and the second window (11) are sapphire material.
7. the open type CO based on Non-Dispersive Infra-red (NDIR) principle according to claim 1
2/ H
2o monitoring device, is characterized in that: described parabolic mirror (2) and 45 ° of catoptrons (5) material are K9 glass, and are coated with golden reflectance coating, and reflectivity reaches more than 98%.
8. the open type CO based on Non-Dispersive Infra-red (NDIR) principle according to claim 1
2/ H
2o monitoring device, is characterized in that: described collimation lens (8) and condenser lens (12) are calcium fluoride material, and are coated with anti-reflection film, and transmitance reaches more than 90%.
9. the open type CO based on Non-Dispersive Infra-red (NDIR) principle according to claim 1
2/ H
2o monitoring device, is characterized in that: described gas light path (10) is one section of open gas light path.
10. the open type CO based on Non-Dispersive Infra-red (NDIR) principle according to claim 1
2/ H
2o monitoring device, is characterized in that: described photo-detector (13) is for carrying the single channel PbSe infrared detector of optical filter.
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|---|---|---|---|
| CN201410206898.8A CN103969210A (en) | 2014-05-15 | 2014-05-15 | Open type CO2/H2O monitoring device based on non-dispersive infrared principle |
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| CN106092886A (en) * | 2016-08-05 | 2016-11-09 | 苏州优谱德精密仪器科技有限公司 | A kind of fluid analyzer unit |
| CN106092888A (en) * | 2016-08-05 | 2016-11-09 | 苏州优谱德精密仪器科技有限公司 | A kind of device for the optical evaluation |
| CN106092887A (en) * | 2016-08-05 | 2016-11-09 | 苏州优谱德精密仪器科技有限公司 | A kind of optical analysis rotating disk |
| CN106092889A (en) * | 2016-08-05 | 2016-11-09 | 苏州优谱德精密仪器科技有限公司 | A kind of optical assay device |
| CN107368103A (en) * | 2017-07-19 | 2017-11-21 | 芜湖市奥尔特光电科技有限公司 | A kind of high definition examination of material evidence instrument of multi-angle adjustment |
| CN109870408A (en) * | 2019-01-15 | 2019-06-11 | 广东省计量科学研究院（华南国家计量测试中心） | A kind of detection method for the optical filter and its application and Nitrogen trifluoride detecting Nitrogen trifluoride for non-dispersive infrared |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359852A (en) * | 2014-11-25 | 2015-02-18 | 云南无线电有限公司 | CO, CO2 and SO2 three-component infrared integrated gas sensor |
| CN106092886A (en) * | 2016-08-05 | 2016-11-09 | 苏州优谱德精密仪器科技有限公司 | A kind of fluid analyzer unit |
| CN106092888A (en) * | 2016-08-05 | 2016-11-09 | 苏州优谱德精密仪器科技有限公司 | A kind of device for the optical evaluation |
| CN106092887A (en) * | 2016-08-05 | 2016-11-09 | 苏州优谱德精密仪器科技有限公司 | A kind of optical analysis rotating disk |
| CN106092889A (en) * | 2016-08-05 | 2016-11-09 | 苏州优谱德精密仪器科技有限公司 | A kind of optical assay device |
| CN107368103A (en) * | 2017-07-19 | 2017-11-21 | 芜湖市奥尔特光电科技有限公司 | A kind of high definition examination of material evidence instrument of multi-angle adjustment |
| CN109870408A (en) * | 2019-01-15 | 2019-06-11 | 广东省计量科学研究院（华南国家计量测试中心） | A kind of detection method for the optical filter and its application and Nitrogen trifluoride detecting Nitrogen trifluoride for non-dispersive infrared |
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Application publication date: 20140806 |