CN102564999A - Gas sensing device - Google Patents
Gas sensing device Download PDFInfo
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- CN102564999A CN102564999A CN2010105877628A CN201010587762A CN102564999A CN 102564999 A CN102564999 A CN 102564999A CN 2010105877628 A CN2010105877628 A CN 2010105877628A CN 201010587762 A CN201010587762 A CN 201010587762A CN 102564999 A CN102564999 A CN 102564999A
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Abstract
The invention discloses a gas sensing device comprising a gas chamber, an optical fiber collimator I and a vibration detecting device, wherein the optical fiber collimator I is fixedly mounted at the upper end of the gas chamber; the vibration detecting device is fixedly connected with the housing of the gas chamber; an inlet is formed in the side wall at the lower part of the gas chamber; an outlet is formed in the side wall at the upper part of the gas chamber; the upper end of the optical fiber collimator I is connected with one end of a transmission optical fiber; the other end of the transmission optical fiber is connected with a pulse laser source; the pulse laser source is further connected with a processing device; the processing device comprises a frequency generator and a processing unit; the frequency generator is connected with the processing unit and the pulse laser source; the processing unit is further connected with a lock-in amplifier; the lock-in amplifier is connected with the vibration detecting device through a transmission line; and a wavelength monitoring module is arranged on the transmission optical fiber and is connected with the processing unit through a conducting wire. As the wavelength monitoring module for monitoring the wavelength change of the laser emitted by the laser source is mounted, the accuracy of a test result is ensured; furthermore, the sensitivity is high and the cost is low.
Description
Technical field
A kind of gas concentration test sensing unit of the present invention, especially relating to a kind of is the gas sensing device of core with the optoacoustic spectroscopy.
Background technology
The detection of gas, the detection of especially flammable, explosive, toxic and harmful, most important to industrial and agricultural production, people's lives, scientific research and national security.
In gas sensor; The detection method of utilizing optoacoustic spectroscopy Characteristics Detection gaseous analytes concentration is known for public institute, has described when the optical excitation gaseous analytes situation that becomes the transform light energy of amplitude modulation light source with optoacoustic gas sensor acoustic energy like United States Patent(USP) No. 4740086.After the luminous energy that incides air chamber is by gas absorption to be measured, just generate the acoustic pressure Reeb of intensity corresponding to gas concentration to be measured in the air chamber, this acoustic pressure Reeb is detected by capacitor microphone.That the optoacoustic gas sensing technology has is highly sensitive, the volume required series of advantages such as little of air chamber, has obtained broad research and application.
In order to reach the cost that higher measuring accuracy also reduces lasing light emitter as much as possible; In the practical application generally our lasing light emitter that can select have only infra-red laser diode and fiber laser, the latter launches higher long distance, the distributed or quasi-distributed optoacoustic spectroscopy gas sensing device on a large scale of being suitable for of the power of laser; The former little of emitted laser power is suitable for single-point or quasi-distributed optoacoustic spectroscopy gas sensing device among a small circle; But the wavelength width that it is their emitted laser that the both has a common ground is narrower; The typical wavelengths width of the laser that infra-red laser diode sends is 0.1nm; And fiber laser can be narrower, and this just means the basic test precision that will guarantee gas sensing device, and lasing light emitter emitted laser wavelength just must lock onto the absorbing wavelength of gas to be measured accurately.Yet; Infra-red laser diode and fiber laser institute emitted laser wavelength can change along with multiple factor such as the temperature of infra-red laser diode and fiber laser, drive current, air pressure; So, in practical application, not only need control the temperature and the drive current of lasing light emitter; Also need monitor its Wavelength of Laser of sending and change, to guarantee precision of test result.
Summary of the invention
Technical matters to be solved by this invention is to above-mentioned deficiency of the prior art; A kind of gas sensing device is provided; It is used to monitor the wavelength monitoring module that lasing light emitter emission optical maser wavelength changes through installation; Thereby guaranteed the accuracy of test result, and had characteristics simple in structure, reasonable in design, highly sensitive and that cost is low, had application value simultaneously.
For solving the problems of the technologies described above; The technical scheme that the present invention adopts is: a kind of gas sensing device; Comprise the air chamber that is used to receive gas to be measured, be fixedly mounted on the optical fiber collimator one of air chamber upper end and be fixedly connected on the vibration detection device on the air chamber shell, said air chamber lower sides is provided with import, and said air chamber upper portion side wall is provided with outlet; One end of said optical fiber collimator one upper end and Transmission Fibers joins; The other end of said Transmission Fibers connects pulsed laser source, and said pulsed laser source is the connection processing device also, and said treating apparatus comprises and is used for the frequency generator and the processing unit that be used for confirm gas concentration of gating pulse lasing light emitter with certain frequency emission laser; Said frequency generator and processing unit join; Said frequency generator also joins with pulsed laser source, and said processing unit also connects lock-in amplifier, and said lock-in amplifier joins through transmission line and vibration detection device; It is characterized in that: said Transmission Fibers is provided with the wavelength monitoring module, and said wavelength monitoring module is joined through lead and processing unit.
Above-mentioned a kind of gas sensing device; It is characterized in that: said wavelength monitoring module is made up of 1X2 fiber coupler, fiber grating and photo-detector; 1 mouthful of said 1X2 fiber coupler through Transmission Fibers connection pulsed laser source; A port in 2 mouthfuls of said 1X2 fiber coupler connects air chamber through Transmission Fibers; 2 mouthfuls another port and fiber grating of said 1X2 fiber coupler join, and said fiber grating also joins with photo-detector, and said photo-detector also joins with lock-in amplifier.
Above-mentioned a kind of gas sensing device is characterized in that: the splitting ratio of said 1X2 fiber coupler is 1: 99.
Above-mentioned a kind of gas sensing device is characterized in that: said fiber grating is More's fiber grating, and the centre of homology wavelength of said More's fiber grating equates with the absorbing wavelength of gas to be measured.
Above-mentioned a kind of gas sensing device; It is characterized in that: said wavelength monitoring module by 1X2 fiber coupler, optical fiber collimator two and photo-detector and closed container four parts that are used to comprise gas to be measured form; 1 mouthful of said 1X2 fiber coupler through Transmission Fibers connection pulsed laser source; A port in 2 mouthfuls of said 1X2 fiber coupler connects air chamber through Transmission Fibers; 2 mouthfuls the another port and the optical fiber collimator two of said 1X2 fiber coupler join, and said optical fiber collimator two also joins with closed container, and said closed container also joins with photo-detector.
Above-mentioned a kind of gas sensing device; It is characterized in that: said wavelength monitoring module is by 1X2 fiber coupler, optical fiber collimator two and be used to comprise the closed container of gas to be measured and be spirally wound on the shaped form housing on the closed container outer wall; Be respectively arranged with a plurality of distortion teeth one and a plurality of distortion teeth two on inboard two the relative faces of said shaped form housing; Said distortion tooth one with the distortion tooth two between the corresponding laying of interleaved; Said distortion tooth one parallels with distortion tooth two and is all parallel with the central axis of closed container; Be equipped with signal optical fibre between said distortion tooth one and the distortion tooth two, said signal optical fibre connects test cell through extended fiber, and said test cell and lock-in amplifier join.
Above-mentioned a kind of gas sensing device is characterized in that: said signal optical fibre one end is provided with light reflecting device, and 1 mouthful of the said signal optical fibre other end and 1X2 fiber coupler is connected, and 2 mouthfuls of said 1X2 fiber coupler are connected with test cell.
Above-mentioned a kind of gas sensing device is characterized in that: said light reflecting device is catoptron or fiber grating.
Above-mentioned a kind of gas sensing device is characterized in that: said pulsed laser source below is provided with heating/refrigerator, is connected with temperature controller between said heating/refrigerator and the processing unit.
Above-mentioned a kind of gas sensing device is characterized in that: said air chamber upper end is provided with the air chamber window, and said optical fiber collimator one lower end is provided with filter plate.
The present invention compared with prior art has the following advantages:
1, gas measuring device of the present invention has the convenient and characteristics such as use-pattern is flexible, sensitivity height of simple in structure, reasonable in design, method of operating.
2, gas sensing device of the present invention; Optical maser wavelength through adopting wavelength monitoring module monitors pulsed laser source to send changes; And feed back to the optical maser wavelength that processing unit control sends pulsed laser source and keep stable; Thereby the optical maser wavelength that pulsed laser source is sent is aimed at the absorbing wavelength of gas to be measured, guarantees precision of test result.
In sum, the present invention is simple in structure, reasonable in design, processing and fabricating convenient and have low cost and other advantages, through adopting the wavelength monitoring module, has guaranteed precision of test result, makes device of the present invention have good use prospect.
Through accompanying drawing and embodiment, the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1.
Fig. 2 is the structural representation of embodiment 1 medium wavelength monitoring modular.
Fig. 3 is the structural representation of embodiment 2.
Fig. 4 is the structural representation of embodiment 3.
Fig. 5 is the inner structure synoptic diagram of shaped form housing among the embodiment 3.
Description of reference numerals:
1-extends optical fiber; The 2-vibration detection device; The 3-transmission line;
4-shaped form housing; 4-1-is out of shape tooth one; 4-2-is out of shape tooth two;
The 5-test cell; The 6-signal optical fibre; The 7-lock-in amplifier;
The 8-import; The 9-outlet; The 10-air chamber;
The 11-lead; 12-wavelength monitoring module; 14-gas to be measured;
The 15-photo-detector; The 16-fiber grating; The 18-closed container;
20-air chamber window; The 21-filter plate; 22-1 optical fiber collimator one;
22-2-optical fiber collimator two; The 23-Transmission Fibers; The 25-pulsed laser source;
30-heating/refrigerator; The 31-temperature controller; The 40-frequency generator;
The 45-1x2 optical branching device; The 50-processing unit.
Embodiment
Embodiment 1
A kind of gas sensing device as shown in Figure 1; Comprise air chamber 10, optical fiber collimator one 22-1 that is fixedly mounted on air chamber 10 upper ends that is used to receive gas 14 to be measured and be fixedly connected on the vibration detection device 2 on air chamber 10 shells; Said air chamber 10 lower sides are provided with import 8; Said air chamber 10 upper portion side wall are provided with outlet 9, and said optical fiber collimator one 22-1 upper end joins with an end of Transmission Fibers 23, and the other end of said Transmission Fibers 23 connects pulsed laser source 25; Said pulsed laser source 25 is the connection processing device also; Said treating apparatus comprises and is used for the frequency generator 40 and the processing unit 50 that be used for confirm gas concentration of gating pulse lasing light emitter 25 with certain frequency emission laser, and said frequency generator 40 joins with processing unit 50, and said frequency generator 40 also joins with pulsed laser source 25; Said processing unit 50 also connects lock-in amplifier 7; Said lock-in amplifier 7 joins through transmission line 3 and vibration detection device 2, and said Transmission Fibers 23 is provided with wavelength monitoring module 12, and said wavelength monitoring module 12 is joined through lead 11 and processing unit 50.
In the present embodiment; As shown in Figure 2; Said wavelength monitoring module 12 is made up of 1X2 fiber coupler 45, fiber grating 16 and photo-detector 15; 1 mouthful of said 1X2 fiber coupler 45 connects pulsed laser sources 25 through Transmission Fibers 23, and a port in 2 mouthfuls of said 1X2 fiber coupler 45 connects air chambers 10 through Transmission Fibers 23, and 2 mouthfuls the another port and the fiber grating 16 of said 1X2 fiber coupler 45 join; Said fiber grating 16 also joins with photo-detector 15, and said photo-detector 15 also joins with lock-in amplifier 7.
Said pulsed laser source 25 belows are provided with heating/refrigerator 30, are connected with temperature controller 31 between said heating/refrigerator 30 and the processing unit 50.Said air chamber 10 upper ends are provided with air chamber window 20, and said optical fiber collimator one 22-1 lower end is provided with filter plate 21.
Preferably; Said fiber grating 16 is More's fiber grating; The centre of homology wavelength of said More's fiber grating equates with the absorbing wavelength of gas 14 to be measured; When pulsed laser source 25 emitted laser wave length shifts, More's fiber grating can stop or reduce pulsed laser source 25 emitted laser and pass, and the laser power that gets on the photo-detector 15 is reduced; Photo-detector 15 passes to processing unit 50 with this information through lead 11; Processing unit 50 is adjusted pulsed laser source 25 emitted laser wavelength through instruction control frequency generator 40 and temperature controller 31, makes pulsed laser source 25 emitted laser wavelength locking on preset wavelength, and this preset wavelength is exactly the absorbing wavelength of gas 14 to be measured.
Preferably; Described fiber grating 16 is a bragg grating; The reflection kernel wavelength of this bragg grating is the absorbing wavelength of gas 14 to be measured, and when lasing light emitter 25 emitted laser wave length shifts, lasing light emitter 25 emitted laser can more be passed bragg grating; The laser power that gets on the photo-detector 15 is increased; Photo-detector 15 passes to processing unit 50 with this information through lead 11, and processing unit 50 is adjusted lasing light emitter 25 emitted laser wavelength locking on preset wavelength through instruction control frequency generator 40 and temperature controller 31, and this preset wavelength is exactly the absorbing wavelength of gas to be measured.
The splitting ratio of said 1X2 fiber coupler 45 is 1: 99, and what wherein optical signal power was few a road is mounted with fiber grating 16 and photo-detector 15.
Preferably, said Transmission Fibers 23 like tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc., also can be plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber for the outside optical fiber that is surrounded by a plurality of protective seams.
Preferably, said Transmission Fibers 23 external packets are covered with waterproof material, like waterproofing unction, can further prevent the erosion of hydrone to Transmission Fibers 23, have prolonged the serviceable life of Transmission Fibers 23.
As shown in Figure 3; In the present embodiment; Said wavelength monitoring module 12 by 1X2 fiber coupler 45, optical fiber collimator two 22-2 and photo-detector 15 and closed container 18 4 parts that are used to comprise gas 14 to be measured form; 1 mouthful of said 1X2 fiber coupler 45 connects pulsed laser sources 25 through Transmission Fibers 23, and a port in 2 mouthfuls of said 1X2 fiber coupler 45 connects air chambers 10 through Transmission Fibers 23, and 2 mouthfuls the another port and optical fiber collimator two 22-2 of said 1X2 fiber coupler 45 join; Said optical fiber collimator two 22-2 also join with closed container 18, and said closed container 18 also joins with photo-detector 15.
When pulsed laser source 25 emitted laser wave length shifts; Comprise gas 14 to be measured in the closed container 18 and can reduce absorption lasing light emitter 25 emitted laser; Make and get into laser power increase on the photo-detector 15; Photo-detector 15 passes to processing unit 50 with this information through lead 11, and processing unit 50 is adjusted lasing light emitter 25 emitted laser wavelength locking on preset wavelength through instruction control frequency generator 40 and temperature controller 31, and this preset wavelength is exactly the absorbing wavelength of gas to be measured.
Preferably, described closed container 18 adopts the material of low temperature expansion coefficient, like quartz glass, low bulk metal material, pottery or other compound substance.
Shown in Figure 4 and 5; In the present embodiment; Said wavelength monitoring module 12 is by 1X2 fiber coupler 45, optical fiber collimator two 22-2 and be used to comprise the closed container 18 of gas 14 to be measured and be spirally wound on the shaped form housing 4 on closed container 18 outer walls; Be respectively arranged with a plurality of distortion tooth one 4-1 and a plurality of distortion tooth two 4-2 on said shaped form housing 4 inboard two relative faces; Corresponding layings of interleaved between said distortion tooth one 4-1 and distortion tooth two 4-2, said distortion tooth one 4-1 be out of shape that tooth two 4-2 parallel and all parallel, said distortion tooth one 4-1 and be out of shape between tooth two 4-2 and be equipped with signal optical fibre 6 with the central axis of closed container 18; Said signal optical fibre 6 connects test cell 5 through extended fiber 1, and said test cell 5 joins with lock-in amplifier 7.
When pulsed laser source 25 emitted laser wave length shifts; Comprise the absorption that gas 14 to be measured can reduce paired pulses lasing light emitter 25 emitted laser in the closed container 18; Thereby the vibration signal amplitude as the closed container of being gathered 18 of the shaped form housing 4 of sensing device and the inner signal optical fibre 6 that comprises is reduced; Test cell 5 obtains this information through the variation that extended fiber 1 records the optical signal power of transmission in the signal optical fibre 6; And pass to processing unit 50 through lead 11; Processing unit 50 is adjusted pulsed laser source 25 emitted laser wavelength locking on preset wavelength through instruction control frequency generator 40 and temperature controller 31, and this preset wavelength is exactly the absorbing wavelength of gas 14 to be measured.
Preferably, the resonant frequency of the described closed container 18 that comprises gas 14 to be measured is away from the resonant frequency of air chamber 10, thereby closed container 18 is operated in the state away from resonance.
Preferably; Said signal optical fibre 6 one ends are provided with light reflecting device; 1 mouthful of said signal optical fibre 6 other ends and 1X2 fiber coupler 45 is connected, and 2 mouthfuls of said 1X2 fiber coupler 45 are connected with test cell 5, and said light reflecting device is catoptron or fiber grating.
Preferably, described closed container 18 adopts the material of low temperature expansion coefficient, like quartz glass, low bulk metal material, pottery or other compound substance.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any restriction, every technical spirit changes any simple modification, change and the equivalent structure that above embodiment did according to the present invention, all still belongs in the protection domain of technical scheme of the present invention.
Claims (10)
1. gas sensing device; Comprise the air chamber (10) that is used to receive gas to be measured (14), be fixedly mounted on the optical fiber collimator one (22-1) of air chamber (10) upper end and be fixedly connected on the vibration detection device (2) on air chamber (10) shell; Said air chamber (10) lower sides is provided with import (8); Said air chamber (10) upper portion side wall is provided with outlet (9); Said optical fiber collimator one (22-1) upper end joins with an end of Transmission Fibers (23); The other end of said Transmission Fibers (23) connects pulsed laser source (25), and said pulsed laser source (25) is the connection processing device also, and said treating apparatus comprises and is used for the frequency generator (40) and the processing unit (50) that be used for definite gas concentration of gating pulse lasing light emitter (25) with certain frequency emission laser; Said frequency generator (40) joins with processing unit (50); Said frequency generator (40) also joins with pulsed laser source (25), and said processing unit (50) also connects lock-in amplifier (7), and said lock-in amplifier (7) joins through transmission line (3) and vibration detection device (2); It is characterized in that: said Transmission Fibers (23) is provided with wavelength monitoring module (12), and said wavelength monitoring module (12) is joined through lead (11) and processing unit (50).
2. according to the described a kind of gas sensing device of claim 1; It is characterized in that: said wavelength monitoring module (12) is made up of 1X2 fiber coupler (45), fiber grating (16) and photo-detector (15); 1 mouthful of said 1X2 fiber coupler (45) through Transmission Fibers (23) connection pulsed laser source (25); A port in 2 mouthfuls of said 1X2 fiber coupler (45) connects air chamber (10) through Transmission Fibers (23); 2 mouthfuls the another port and the fiber grating (16) of said 1X2 fiber coupler (45) join, and said fiber grating (16) also joins with photo-detector (15), and said photo-detector (15) also joins with lock-in amplifier (7).
3. according to the described a kind of gas sensing device of claim 2, it is characterized in that: the splitting ratio of said 1X2 fiber coupler (45) is 1: 99.
4. according to the described a kind of gas sensing device of claim 2, it is characterized in that: said fiber grating (16) is More's fiber grating, and the centre of homology wavelength of said More's fiber grating equates with the absorbing wavelength of gas to be measured (14).
5. according to the described a kind of gas sensing device of claim 1; It is characterized in that: said wavelength monitoring module (12) by 1X2 fiber coupler (45), optical fiber collimator two (22-2) and photo-detector (15) and closed container (18) four parts that are used to comprise gas to be measured (14) form; 1 mouthful of said 1X2 fiber coupler (45) through Transmission Fibers (23) connection pulsed laser source (25); A port in 2 mouthfuls of said 1X2 fiber coupler (45) connects air chamber (10) through Transmission Fibers (23); 2 mouthfuls the another port and the optical fiber collimator two (22-2) of said 1X2 fiber coupler (45) join; Said optical fiber collimator two (22-2) also joins with closed container (18), and said closed container (18) also joins with photo-detector (15).
6. according to the described a kind of gas sensing device of claim 1; It is characterized in that: said wavelength monitoring module (12) is by 1X2 fiber coupler (45), optical fiber collimator two (22-2) and be used to comprise the closed container (18) of gas to be measured (14) and be spirally wound on the shaped form housing (4) on closed container (18) outer wall; Be respectively arranged with a plurality of distortion teeth one (4-1) and a plurality of distortion tooth two (4-2) on inboard two the relative faces of said shaped form housing (4); The corresponding laying of interleaved between said distortion tooth one (4-1) and distortion tooth two (4-2); Said distortion tooth one (4-1) parallels with distortion tooth two (4-2) and is all parallel with the central axis of closed container (18); Be equipped with signal optical fibre (6) between said distortion tooth one (4-1) and the distortion tooth two (4-2); Said signal optical fibre (6) connects test cell (5) through extended fiber (1), and said test cell (5) joins with lock-in amplifier (7).
7. according to the described a kind of gas sensing device of claim 6; It is characterized in that: said signal optical fibre (6) one ends are provided with light reflecting device; 1 mouthful of said signal optical fibre (6) other end and 1X2 fiber coupler (45) is connected, and 2 mouthfuls of said 1X2 fiber coupler (45) are connected with test cell (5).
8. according to the described a kind of gas sensing device of claim 7, it is characterized in that: said light reflecting device is catoptron or fiber grating.
9. according to the described a kind of gas sensing device of claim 1, it is characterized in that: said pulsed laser source (25) below is provided with heating/refrigerator (30), is connected with temperature controller (31) between said heating/refrigerator (30) and the processing unit (50).
10. according to the described a kind of gas sensing device of claim 1, it is characterized in that: said air chamber (10) upper end is provided with air chamber window (20), and said optical fiber collimator one (22-1) lower end is provided with filter plate (21).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105877628A CN102564999A (en) | 2010-12-15 | 2010-12-15 | Gas sensing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105877628A CN102564999A (en) | 2010-12-15 | 2010-12-15 | Gas sensing device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645156A (en) * | 2013-12-27 | 2014-03-19 | 北京雪迪龙科技股份有限公司 | TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection method and system |
| CN104280341A (en) * | 2014-10-27 | 2015-01-14 | 合肥卓越分析仪器有限责任公司 | Equipment for detecting carbon content of steel samples |
| CN106955090A (en) * | 2017-05-09 | 2017-07-18 | 陈志霖 | Pulse diagnosing device, gas-detecting device, simulation pulse device and traditional Chinese medical science diagnosis and therapy system |
| CN107991269A (en) * | 2018-01-23 | 2018-05-04 | 山东省科学院激光研究所 | Multicomponent gas monitoring system, method and device |
| CN108169150A (en) * | 2017-12-06 | 2018-06-15 | 中国电子科技集团公司第八研究所 | A kind of lossless on-Line Monitor Device of solid rocket propellant volatilization gas optical fiber |
| CN109477791A (en) * | 2016-07-29 | 2019-03-15 | 国立大学法人德岛大学 | Concentration measurement apparatus |
| CN110361332A (en) * | 2019-07-09 | 2019-10-22 | 华中科技大学 | A kind of photoacoustic cell for the detection of gas optoacoustic spectroscopy |
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2010
- 2010-12-15 CN CN2010105877628A patent/CN102564999A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645156A (en) * | 2013-12-27 | 2014-03-19 | 北京雪迪龙科技股份有限公司 | TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas detection method and system |
| CN103645156B (en) * | 2013-12-27 | 2016-03-02 | 北京雪迪龙科技股份有限公司 | A kind of TDLAS gas detection method and system |
| CN104280341A (en) * | 2014-10-27 | 2015-01-14 | 合肥卓越分析仪器有限责任公司 | Equipment for detecting carbon content of steel samples |
| CN109477791A (en) * | 2016-07-29 | 2019-03-15 | 国立大学法人德岛大学 | Concentration measurement apparatus |
| CN106955090A (en) * | 2017-05-09 | 2017-07-18 | 陈志霖 | Pulse diagnosing device, gas-detecting device, simulation pulse device and traditional Chinese medical science diagnosis and therapy system |
| CN106955090B (en) * | 2017-05-09 | 2023-09-15 | 陈志霖 | Pulse feeling device, gas detection device, pulse simulating device and traditional Chinese medicine diagnosis and treatment system |
| CN108169150A (en) * | 2017-12-06 | 2018-06-15 | 中国电子科技集团公司第八研究所 | A kind of lossless on-Line Monitor Device of solid rocket propellant volatilization gas optical fiber |
| CN107991269A (en) * | 2018-01-23 | 2018-05-04 | 山东省科学院激光研究所 | Multicomponent gas monitoring system, method and device |
| CN107991269B (en) * | 2018-01-23 | 2023-07-14 | 山东省科学院激光研究所 | Multicomponent gas monitoring system, method and device |
| CN110361332A (en) * | 2019-07-09 | 2019-10-22 | 华中科技大学 | A kind of photoacoustic cell for the detection of gas optoacoustic spectroscopy |
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Application publication date: 20120711 |