CN203324177U - Device for measuring gas concentration - Google Patents
Device for measuring gas concentration Download PDFInfo
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- CN203324177U CN203324177U CN2013200582111U CN201320058211U CN203324177U CN 203324177 U CN203324177 U CN 203324177U CN 2013200582111 U CN2013200582111 U CN 2013200582111U CN 201320058211 U CN201320058211 U CN 201320058211U CN 203324177 U CN203324177 U CN 203324177U
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Abstract
The utility model relates to a device for measuring the gas concentration. The device comprises an infrared light source, a first lens, a gas testing chamber, a narrow-band filter and an infrared sensor which are sequentially connected with one another according to a propagation direction of optical signals, wherein the infrared light source is used for emitting broad-spectrum infrared light, the first lens is used for converging the infrared light, the gas testing chamber is used for containing tested gas which absorbs the infrared light, the narrow-band filter is used for filtering the broad-spectrum infrared light into narrow-band infrared light, and the infrared sensor is used for receiving infrared light signals and converting the infrared light signals into electrical signals. The device also comprises a driving unit and a signal processing unit, the driving unit is connected with the infrared light source and used for driving the infrared light source to emit the light, and the signal processing unit is connected with the infrared sensor and is used for processing the electrical signals and calculating a concentration value of gas to be tested. The device for measuring the gas concentration, provided by the utility model, can be used for greatly enhancing light intensity signals under the condition that the light source, the gas testing chamber and the sensor are not changed.
Description
Technical field
The utility model relates to the field of measuring concentration, particularly a kind of device of measure gas concentrations.
Background technology
In medical field, carry out Checking and diagnosis patient situation by the gas concentration of measuring and analyze patient's exhalation, be a kind of technological means commonly used.As the CO2 measurement of breathing out, the measurement of N2O measurement/anesthetic gases etc.Common detection mode is to use Non-Dispersive Infra-red (NDIR) method (NDIR).Its measuring principle is the infrared energy that specific gas can absorb specific wavelength; And the concentration of gas is larger, more to the absorption of infrared light.As the absorption peak of carbon dioxide and laughing gas, in 4～5 microns infrared bands, and the absorption peak of anesthetic gases (fluothane, enflurane, Isoflurane, Sevoflurane, desflurane) is positioned at 8～13 microns infrared bands.The gas concentration measuring apparatus that utilizes the Non-Dispersive Infra-red (NDIR) method to make can select the infrared light of specific wavelength to measure certain gas by narrow band pass filter, by the light intensity attenuation at this optical filter transmittance spectrum, calculates this gas concentration.
The device of Non-Dispersive Infra-red (NDIR) method measure gas concentrations commonly used mainly comprises several parts: driver element, infrared light supply, detection air chamber (inlet and gas outlet), infrared sensor, processing unit etc.Because the luminous power of the wide spectrum infrared light supply used in current technology is limited, then pass through the most light of narrow band pass filter elimination, the infrared energy that arrives infrared sensor is always very faint.For improving signal intensity, the normal use increases light source power, increases the air chamber transparent aperture or uses more highly sensitive sensor method in the industry.But said method has larger limitation: strengthen light source works power and can cause light source life to descend; Increasing the air chamber aperture can cause the measurement response time of gas concentration slack-off; The sensor of change sensitivity means cost that need to be higher; Therefore can not address this problem fully.
The utility model content
For overcoming above-mentioned defect, the purpose of this utility model is a kind of device of measure gas concentrations.
The purpose of this utility model is achieved through the following technical solutions:
The device of a kind of measure gas concentrations of the present utility model, comprise the infrared light supply, first lens, detection air chamber, narrow band pass filter and the infrared sensor that connect successively according to the lightray propagation direction; Described infrared light supply is for sending the wide spectrum infrared light; Described first lens is for converging infrared light; Described detection air chamber comprises the air intake opening that detection gas enters and detects the gas outlet that gas flows out, and this detection air chamber is for holding the tested gas that absorbs infrared light; Described narrow band pass filter is for being filtered into the arrowband infrared light by the wide spectrum infrared light; Described infrared sensor is used for receiving infrared signal, and this infrared signal is converted to electric signal; Wherein, also comprise driver element and signal processing unit; This driver element is connected with infrared light supply, luminous for driving infrared light supply; Described signal processing unit is connected with infrared sensor, for receiving described electric signal, and this electric signal is carried out to signal condition, signal amplification and analog-to-digital conversion and process, and go out the concentration value of gas to be measured according to the calculated signals of processing.
The device of a kind of measure gas concentrations of the present utility model, also comprise and be arranged at the second lens that detect between air chamber and narrow band pass filter, for converging by remaining infrared light after tested gas absorption.
The device of a kind of measure gas concentrations of the present utility model, the front end of described detection air chamber and rear end have the broadband window mirror through infrared light, and this broadband window mirror will be measured the front-end and back-end sealing of air chamber.
The device of a kind of measure gas concentrations of the present utility model, described narrow band pass filter comprises the first narrow band pass filter and the second narrow band pass filter, described the first narrow band pass filter and the second convex lens be arranged in parallel, and the centre wavelength of this first narrow band pass filter in the absorption band to infrared light, is measured the passage of light in gas to be measured for conduct; Described the second narrow band pass filter arranges with the second convex lens are vertical, and the centre wavelength of this second narrow band pass filter is in gas to be measured outside the absorption band to infrared light, for the passage as with reference to light.
The device of a kind of measure gas concentrations of the present utility model, described infrared sensor comprises the first infrared sensor and the second infrared sensor; This first infrared sensor and the first narrow band pass filter be arranged in parallel, for receiving the flashlight of measuring optical channel; This second infrared sensor and the second narrow band pass filter be arranged in parallel, for receiving the flashlight of reference light passage.
The device of a kind of measure gas concentrations of the present utility model, described narrow band pass filter comprises the first narrow band pass filter and the second narrow band pass filter; Described the second lens comprise two convex lens of vertically placing, and are arranged with respectively the first narrow band pass filter and the second narrow band pass filter in parallel.
The device of a kind of measure gas concentrations of the present utility model, the described wavelength coverage that goes out the wide spectrum infrared light is 1～20um.
The device of a kind of measure gas concentrations of the present utility model, described first lens and the second lens are convex lens.
The device of a kind of measure gas concentrations of the present utility model, is characterized in that, the concentration value computing formula of described gas to be measured is y=f (IM/IREF), wherein
For the infrared light intensity after gas absorption to be measured,
For not passing through the infrared light intensity of gas absorption to be measured, y is gas concentration value to be measured.
The device of a kind of measure gas concentrations provided by the utility model can in the situation that light source, detect air chamber, sensor is constant, significantly strengthens light intensity signal; Also can when increasing signal intensity, reduce the air chamber volume, make the gas to be measured of same flow be full of the time decreased of whole air chamber, improve the response speed of whole measuring system.Therefore the device of a kind of measure gas concentrations of the present utility model has following three advantages: (1) improves signal to noise ratio (S/N ratio); (2) reduce device volume; (3) improve response speed.
The accompanying drawing explanation
For ease of explanation, the utility model is described in detail by following preferred embodiment and accompanying drawing;
An integral module schematic diagram of the device that Fig. 1 is a kind of measure gas concentrations of the present utility model;
First embodiment device figure of the device that Fig. 2 is a kind of measure gas concentrations of the present utility model;
Second embodiment device figure of the device that Fig. 3 is a kind of measure gas concentrations of the present utility model;
The 3rd embodiment device figure of the device that Fig. 4 is a kind of measure gas concentrations of the present utility model;
The 4th embodiment device figure of the device that Fig. 5 is a kind of measure gas concentrations of the present utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Please refer to shown in Fig. 1, the device of realizing a kind of measure gas concentrations of the present utility model comprises: driver element 100, the infrared light supply 101 connected successively according to the lightray propagation direction, first lens 102, detection air chamber 103, the second lens 104, narrow band pass filter 105 and infrared sensor 106, signal processing unit 107.
Wherein, described driver element 100 is connected with infrared light supply 101, luminous for driving infrared light supply; Described driver element is constant voltage, constant current or Constant-power drive circuit, and electric energy is provided, and drives infrared source working, and can drive infrared light supply to send the infrared signal of direct current or send frequency is the infrared signal that 10～100Hz exchanges.
Wherein, described infrared light supply 101, for infrared light supply is provided, can send the light source of wide spectrum infrared light, and its light wavelength is 1～20um; This infrared light supply is not identical with the infrared laser that sends narrow band light, and because the luminescent spectrum of infrared laser is arrowband, the spectral width of the infrared light sent is much smaller than 1um.
Wherein, described first lens 102 is for being converged infrared light; This first lens is preferably convex lens, according to convex lens imaging principle, infrared light is played to the effect of converging.
Wherein, described detection air chamber 103 is for holding detected gas; Wherein this detection air chamber comprises air intake opening and gas outlet; Detected gas enters from air intake opening, arrives the detection air chamber and carries out gas concentration measurement, then flow out from gas outlet; Detect air chamber 103 and can be divided into according to the mode of gas flow two kinds of main flow air chamber and by-pass flow air chambers; Wherein the main flow air chamber is for to enter the detection air chamber according to the effect driving gas of external force, and the by-pass flow air chamber is that the membrane pump extracting gases that system carries enters the detection air chamber; Wherein two kinds of modes of the detection air chamber in the utility model all can; When the infrared light process detects air chamber, gas to be measured can absorb the infrared light of specific wavelength, and according to Lambert-Beer's law, the concentration of known gas to be measured is higher, more to the absorption of infrared light, with this, just can calculate the concentration of gas to be measured.
Wherein, described the second lens 104 detect remaining infrared light after the air chamber gas absorption for converging, and are also to converge infrared light; Wherein the second lens and first lens can exist also simultaneously and can have one; And first lens and the second lens can be lens or lens combination, and preferred convex lens; Wherein the material of lens is infra-red material.The plastic materials such as the glass materials such as crystalline materials such as CaF2, BaF2 or orpiment glass or teflon, those materials have wider spectrum transmittancy at infrared band.
Wherein, described narrow band pass filter 105 is for being filtered into the arrowband infrared light to the wide spectrum infrared light; Wherein, select different narrow band pass filters according to the difference of gas to be measured; For example, while measuring CO2, usually select the narrow band pass filter of centre wavelength in 4.2～4.3um scope, measuring NO2, usually select the narrow band pass filter of centre wavelength in 5.2～5.4um scope; What wherein narrow band pass filter can be for monolithic or biplate; When narrow band pass filter is biplate, wherein the centre wavelength of a slice narrow band pass filter is in gas to be measured in the absorption band to infrared light, as measuring optical channel, infrared light intensity after this narrow band pass filter filters can significantly be affected (by gas absorption infrared light to be measured) by gas concentration to be measured, the light intensity of measuring by this measurement optical channel can calculate the concentration of gas to be measured; And in addition the centre wavelength of a slice in gas to be measured outside the absorption band to infrared light, as the reference optical channel, infrared light intensity after this another narrow band pass filter is not subject to the impact (being that gas to be measured does not absorb infrared light substantially) of gas concentration to be measured, and the intensity of this reference light channel measurement can be used as the reference data of original luminous intensity.And narrow band pass filter 105 is while being monolithic, this narrow band pass filter is only made the narrow band pass filter of measuring optical channel, but take the reference data that the infrared light intensity that records while not passing into gas to be measured is original luminous intensity.Generally, narrow band pass filter normally carries out plated film on the substrates such as silicon, germanium to be made, very thin thickness, and it does not change the direction that infrared light is propagated.
Wherein, described infrared sensor 106 is for receiving infrared signal, and this infrared signal is converted to electric signal; Be that infrared sensor can sensitive response infrared signal and be translated into electric signal.Generally comprise thermopile sensor or pyroelectric sensor; For example, at the infrared light for direct current, can use thermopile sensor, the infrared light of interchange can be used pyroelectric sensor.Infrared sensor in the utility model can comprise one or two, and the quantity of this infrared sensor is identical with the quantity of narrow band pass filter, and, when two infrared sensors are arranged, one of them is corresponding to measuring optical channel, and another is corresponding to the reference light passage; When an infrared sensor is arranged, only corresponding to measuring optical channel.
Wherein, described signal processing unit 107 is connected with described infrared sensor 106, for receiving described electric signal, and this electric signal is carried out to signal condition, signal amplification and analog-to-digital conversion and process, and then according to the calculated signals of processing, goes out the concentration value of gas to be measured; And general computing method are according to shown in following formula: y=f (IM/IREF); In formula
For the infrared light intensity after gas absorption to be measured,
For not passing through the infrared light intensity of gas absorption to be measured, both are divided by and can obtain the ratio of gas absorption light intensity.F () function is that gas is to the assimilation ratio of infrared light and the relation curve function of gas concentration (relation curve can be measured acquisition by experiment, and function can obtain by the matching to empirical curve).Function calculating by f () can obtain gas concentration value y to be measured.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with concrete device, be described.
Embodiment mono-
Please refer to Fig. 2, based on a kind of measure gas concentrations device of the present utility model, comprising: light source driving circuit 200, infrared light supply 201, convex lens 202, detection air chamber 203, narrow band pass filter 204, infrared sensor 205 and signal processing unit 206; Its mid-infrared light source is arranged on the front end of measure gas concentrations device, sends the infrared light of wide spectrum, and wavelength is between 1～20um; Light source driving circuit 200 is electrically connected to infrared light supply, for driving infrared light supply 201 luminous; It can drive infrared light supply to send the infrared signal of direct current or send frequency is the infrared signal that 10～100Hz exchanges.Described convex lens 202 are arranged at infrared light supply 201 rear ends, and detect air chamber 203 front ends, that is to say that convex lens 202 are arranged at infrared light supply 201 and detect between air chamber 203, for converging the infrared light of wide-angle.Described detection air chamber 203 is arranged at convex lens 202 rear ends, for holding gas to be measured; Described gas to be measured enters from the air intake opening that detects air chamber 203, from gas outlet, flows out, and wherein detects the front and back end of air chamber and can seal with the broadband window mirror that sees through infrared light; And window mirror material can use CaF2, BaF2 material to make.Also can will detect the back-end closure of air chamber 203, front end is directly used convex lens 202 as detecting the air chamber closed window.Described narrow band pass filter 204 is identical with aforesaid narrow band pass filter, uses a slice narrow band pass filter simultaneously; Infrared sensor 205 is identical with aforementioned infrared sensor.Use an infrared sensor simultaneously.Described signal processing unit 206 is identical with aforementioned signal processing unit effect, accepts the electric signal that infrared sensor sends, and this electric signal is carried out to the signals such as signal condition, signal amplification, analog-to-digital conversion and process, and finally calculates gas concentration value to be measured.
Only use a slice convex lens, a narrow band pass filter and an infrared sensor in the present embodiment one, comparatively simply realized the measurement of gas concentration.
Embodiment bis-
Please refer to Fig. 3, the utility model provides the optical devices of another kind of gas concentration measurement, comprises light source driving circuit 300, infrared light supply 301, the first convex lens 302, detects air chamber 303, the second convex lens 304, narrow band pass filter 305, infrared sensor 306 and signal processing unit 307.Wherein in the present embodiment, from embodiment bis-different, be to have used two convex lens, the difference of two convex lens is the focal length difference, and the focal length of the first convex lens 302 is the distance between infrared light supply 301 to first convex lens 302; The focal length of the second convex lens 304 is the distance between infrared sensor 306 to second convex lens 304; In the present embodiment, two convex lens can, simultaneously as the front end closed window and the back-end closure window that detect air chamber, avoid gas to leak from two ends simultaneously.
In the present embodiment two, used two convex lens to design more flexibly the focal length of two lens according to the size of infrared light supply and sensor, the volume of whole measurement mechanism is further dwindled.
Embodiment tri-
Please refer to Fig. 4, the utility model provides the optical devices of another kind of gas concentration measurement, comprises light source driving circuit 400, infrared light supply 401, the first convex lens 402, detects air chamber 403, the second convex lens 404, spectroscope 405, the first narrow band pass filter 406a, second narrow band pass filter 406b the first infrared sensor 407a, the second infrared sensor 407b and signal processing unit 408; Wherein the difference of the present embodiment and the second embodiment is to be provided with spectroscope between the second convex lens 404 and the first narrow band pass filter 406a, and spectroscope is miter angle to be placed, and its spectroscopical acting as is divided into projection light and reflected light by the infrared light through the second convex lens 404; And the first narrow band pass filter 406a and the second convex lens 404 be arranged in parallel, the second narrow band pass filter 406b and the vertical setting of the second convex lens 404, and the first narrow band pass filter and the second narrow band filter slice are arranged at respectively spectroscopical both sides.Simultaneously the centre wavelength of the first narrow band pass filter 406a is in gas to be measured in the absorption band to infrared light, as the optical filter of measuring optical channel; The centre wavelength of the second narrow band pass filter 406b is in gas to be measured outside the absorption band to infrared light, as the optical filter of reference optical channel; And the first infrared sensor 407a receives the flashlight of measuring optical channel, the second infrared sensor 407b receives the flashlight of reference light passage.
Embodiment tetra-
Please refer to Fig. 5, the utility model provides the optical devices of another kind of gas concentration measurement, comprises light source driving circuit 500, infrared light supply 501, the first convex lens 502, detects air chamber 503, the second convex lens 504, the first narrow band pass filter 505a, the second narrow band pass filter 505b, the first infrared sensor 506a, the second infrared sensor 506b and signal processing unit 507; Wherein the difference of the present embodiment and the 3rd embodiment is that the second convex lens are a convex lens group, comprise two little convex lens of vertically placing, do not use spectroscope yet, vertically be placed with respectively the first narrow band pass filter 505a and the second narrow band pass filter 505b after little convex lens; Other parts are all identical with the 3rd embodiment, and effect is also identical.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (9)
1. the device of a measure gas concentrations, is characterized in that, comprises the infrared light supply, first lens, detection air chamber, narrow band pass filter and the infrared sensor that connect successively according to the lightray propagation direction; Described infrared light supply is for sending the wide spectrum infrared light; Described first lens is for converging infrared light; Described detection air chamber comprises the air intake opening that detection gas enters and detects the gas outlet that gas flows out, and this detection air chamber is for holding the tested gas that absorbs infrared light; Described narrow band pass filter is for being filtered into the arrowband infrared light by the wide spectrum infrared light; Described infrared sensor is used for receiving infrared signal, and this infrared signal is converted to electric signal; Wherein, also comprise driver element and signal processing unit; This driver element is connected with infrared light supply, luminous for driving infrared light supply; Described signal processing unit is connected with infrared sensor, for receiving described electric signal, and this electric signal is carried out to signal condition, signal amplification and analog-to-digital conversion and process, and go out the concentration value of gas to be measured according to the calculated signals of processing.
2. the device of a kind of measure gas concentrations as claimed in claim 1, is characterized in that, also comprises and be arranged at the second lens that detect between air chamber and narrow band pass filter, for converging by remaining infrared light after tested gas absorption.
3. the device of a kind of measure gas concentrations as claimed in claim 2, is characterized in that, the front end of described detection air chamber and rear end have the broadband window mirror through infrared light, and this broadband window mirror will be measured the front-end and back-end sealing of air chamber.
4. the device of a kind of measure gas concentrations as claimed in claim 2, is characterized in that, also comprises the spectroscope be arranged between the second lens and narrow band pass filter, and this spectroscope is for being divided into projection light and reflected light by infrared light.
5. as the device of claim 2 or 4 described a kind of measure gas concentrations, it is characterized in that, described narrow band pass filter comprises the first narrow band pass filter and the second narrow band pass filter, described the first narrow band pass filter and the second convex lens be arranged in parallel, and the centre wavelength of this first narrow band pass filter in the absorption band to infrared light, is measured the passage of light in gas to be measured for conduct; Described the second narrow band pass filter arranges with the second convex lens are vertical, and the centre wavelength of this second narrow band pass filter is in gas to be measured outside the absorption band to infrared light, for the passage as with reference to light.
6. the device of a kind of measure gas concentrations as claimed in claim 5, is characterized in that, described infrared sensor comprises the first infrared sensor and the second infrared sensor; This first infrared sensor and the first narrow band pass filter be arranged in parallel, for receiving the flashlight of measuring optical channel; This second infrared sensor and the second narrow band pass filter be arranged in parallel, for receiving the flashlight of reference light passage.
7. the device of a kind of measure gas concentrations as claimed in claim 2, is characterized in that, described narrow band pass filter comprises the first narrow band pass filter and the second narrow band pass filter; Described the second lens comprise two convex lens of vertically placing, and are arranged with respectively the first narrow band pass filter and the second narrow band pass filter in parallel.
8. the device of a kind of measure gas concentrations as claimed in claim 1 or 2, is characterized in that, the described wavelength coverage that goes out the wide spectrum infrared light is 1～20um.
9. the device of a kind of measure gas concentrations as claimed in claim 2, is characterized in that, described first lens and the second lens are convex lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013200582111U CN203324177U (en) | 2013-02-01 | 2013-02-01 | Device for measuring gas concentration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013200582111U CN203324177U (en) | 2013-02-01 | 2013-02-01 | Device for measuring gas concentration |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089919A (en) * | 2014-07-03 | 2014-10-08 | 中国人民解放军后勤工程学院 | Infrared spectrum-based detection method of large-space oil gas concentration of oil house |
| CN105403530A (en) * | 2015-10-26 | 2016-03-16 | 长沙开元仪器股份有限公司 | Gas concentration detection apparatus and method thereof |
| CN105466491A (en) * | 2015-12-28 | 2016-04-06 | 中国科学院武汉物理与数学研究所 | Imaging-type combustion temperature and concentration measurement device based on dual-channel molecule optical filtering |
| CN105675529A (en) * | 2016-01-21 | 2016-06-15 | 电子科技大学 | Microminiature mid-infrared optical waveguide gas sensor |
| CN106338490A (en) * | 2016-11-16 | 2017-01-18 | 周学成 | Infrared light detection water concentration sensor |
| CN106353263A (en) * | 2015-07-16 | 2017-01-25 | 株式会社堀场制作所 | Gas ingredient detection device |
| CN106814043A (en) * | 2015-12-01 | 2017-06-09 | 昆明勤瑞科技有限公司 | A kind of quick screening device of chloroform and method |
| CN106990197A (en) * | 2016-01-20 | 2017-07-28 | 株式会社岛津制作所 | Dual channel flame photometric detector |
| CN108507966A (en) * | 2018-07-02 | 2018-09-07 | 青岛海纳光电环保有限公司 | A kind of infrared spectrum gas sensor and data processing method |
| CN108955780A (en) * | 2018-09-07 | 2018-12-07 | 广州南控自动化设备有限公司 | A kind of turbine flowmeter of detectable gas quality |
| CN109342347A (en) * | 2018-11-05 | 2019-02-15 | 安徽建筑大学 | A kind of multi-mode gas analyzing apparatus and analysis method |
| CN111141695A (en) * | 2019-12-24 | 2020-05-12 | 中国船舶重工集团公司第七一八研究所 | Non-dispersive infrared multi-component Freon gas detection system |
| CN113640242A (en) * | 2021-08-23 | 2021-11-12 | 北京信息科技大学 | Portable liver total reserve function detector and method based on infrared light absorption |
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2013
- 2013-02-01 CN CN2013200582111U patent/CN203324177U/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089919A (en) * | 2014-07-03 | 2014-10-08 | 中国人民解放军后勤工程学院 | Infrared spectrum-based detection method of large-space oil gas concentration of oil house |
| CN106353263A (en) * | 2015-07-16 | 2017-01-25 | 株式会社堀场制作所 | Gas ingredient detection device |
| CN105403530A (en) * | 2015-10-26 | 2016-03-16 | 长沙开元仪器股份有限公司 | Gas concentration detection apparatus and method thereof |
| CN106814043A (en) * | 2015-12-01 | 2017-06-09 | 昆明勤瑞科技有限公司 | A kind of quick screening device of chloroform and method |
| CN105466491A (en) * | 2015-12-28 | 2016-04-06 | 中国科学院武汉物理与数学研究所 | Imaging-type combustion temperature and concentration measurement device based on dual-channel molecule optical filtering |
| CN106990197A (en) * | 2016-01-20 | 2017-07-28 | 株式会社岛津制作所 | Dual channel flame photometric detector |
| CN105675529A (en) * | 2016-01-21 | 2016-06-15 | 电子科技大学 | Microminiature mid-infrared optical waveguide gas sensor |
| CN105675529B (en) * | 2016-01-21 | 2018-10-12 | 电子科技大学 | Microminiature mid-infrared light waveguide gas sensor |
| CN106338490A (en) * | 2016-11-16 | 2017-01-18 | 周学成 | Infrared light detection water concentration sensor |
| CN108507966A (en) * | 2018-07-02 | 2018-09-07 | 青岛海纳光电环保有限公司 | A kind of infrared spectrum gas sensor and data processing method |
| CN108955780A (en) * | 2018-09-07 | 2018-12-07 | 广州南控自动化设备有限公司 | A kind of turbine flowmeter of detectable gas quality |
| CN109342347A (en) * | 2018-11-05 | 2019-02-15 | 安徽建筑大学 | A kind of multi-mode gas analyzing apparatus and analysis method |
| CN111141695A (en) * | 2019-12-24 | 2020-05-12 | 中国船舶重工集团公司第七一八研究所 | Non-dispersive infrared multi-component Freon gas detection system |
| CN113640242A (en) * | 2021-08-23 | 2021-11-12 | 北京信息科技大学 | Portable liver total reserve function detector and method based on infrared light absorption |
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