CN201974366U - Gas sensing device - Google Patents
Gas sensing device Download PDFInfo
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- CN201974366U CN201974366U CN2010206587191U CN201020658719U CN201974366U CN 201974366 U CN201974366 U CN 201974366U CN 2010206587191 U CN2010206587191 U CN 2010206587191U CN 201020658719 U CN201020658719 U CN 201020658719U CN 201974366 U CN201974366 U CN 201974366U
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- sensing device
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- air chamber
- gas sensing
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Abstract
The utility model discloses a gas sensing device, which comprises a gas chamber, a fiber collimator 1 fixedly mounted at the upper end of the gas chamber, and a vibration detector fixedly connected with a shell of the gas chamber; an inlet is arranged on the side wall of the lower part of the gas chamber; an outlet is arranged on the side wall of the upper part of the gas chamber; the upper end of the fiber collimator 1 is connected with one end of a transmission fiber; the other end of the transmission fiber is connected with a pulse laser source; the pulse laser source is also connected with a processor; the processor comprises a frequency generator and a processing unit; the frequency generator is connected with the processing unit; the frequency generator is also connected with the pulse laser source; the processing unit is also connected with a locking amplifier; the locking amplifier is also connected with the vibration detector through a transmission line; a wavelength monitoring module is arranged on the transmission fiber; and the wavelength monitoring module is connected with the processing unit through a lead. As the wavelength monitoring module for monitoring the wavelength change of laser waves emitted by the laser source, the accuracy of the test result of the gas sensing device is guaranteed; moreover, the sensitivity is high, and the cost is low.
Description
Technical field
A kind of gas concentration test sensing unit of the utility model, 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, utilize the detection method of optoacoustic spectroscopy Characteristics Detection gaseous analytes concentration known, described the situation that with optoacoustic gas sensor the transform light energy of amplitude modulation light source is become acoustic energy when the optical excitation gaseous analytes as U.S. Patent No. 4740086 by the public.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, 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 actual applications, not only need to control the temperature and the drive current of lasing light emitter, also need to monitor its Wavelength of Laser of sending and change, to guarantee precision of test result.
The utility model content
Technical problem to be solved in the utility model is at 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 by installation, thereby guaranteed the accuracy of test result, and have characteristics simple in structure, reasonable in design, highly sensitive and that cost is low, have application value simultaneously.
For solving the problems of the technologies described above, the technical solution adopted in the utility model 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 and the vibration detection device that is fixedly connected on the air chamber shell of air chamber upper end, described air chamber lower sides is provided with import, described air chamber upper portion side wall is provided with outlet, one end of described optical fiber collimator one upper end and Transmission Fibers joins, the other end of described Transmission Fibers connects pulsed laser source, described pulsed laser source is the connection processing device also, described treating apparatus comprises and is used for the gating pulse lasing light emitter with the frequency generator of certain frequency emission laser be used for determining the processing unit of gas concentration, described frequency generator and processing unit join, described frequency generator also joins with pulsed laser source, described processing unit also connects lock-in amplifier, described lock-in amplifier joins by transmission line and vibration detection device, it is characterized in that: described Transmission Fibers is provided with the wavelength monitoring module, and described wavelength monitoring module is joined by lead and processing unit.
Above-mentioned a kind of gas sensing device, it is characterized in that: described wavelength monitoring module is made up of 1X2 fiber coupler, fiber grating and photo-detector, 1 mouthful of described 1X2 fiber coupler by Transmission Fibers connection pulsed laser source, a port in 2 mouthfuls of described 1X2 fiber coupler connects air chamber by Transmission Fibers, 2 mouthfuls another port and fiber grating of described 1X2 fiber coupler join, described fiber grating also joins with photo-detector, and described photo-detector also joins with lock-in amplifier.
Above-mentioned a kind of gas sensing device is characterized in that: the splitting ratio of described 1X2 fiber coupler is 1: 99.
Above-mentioned a kind of gas sensing device is characterized in that: described fiber grating is More's fiber grating, and the centre of homology wavelength of described 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: described wavelength monitoring module is by the 1X2 fiber coupler, optical fiber collimator two and photo-detector and the closed container four parts composition that is used to comprise gas to be measured, 1 mouthful of described 1X2 fiber coupler by Transmission Fibers connection pulsed laser source, a port in 2 mouthfuls of described 1X2 fiber coupler connects air chamber by Transmission Fibers, 2 mouthfuls the another port and the optical fiber collimator two of described 1X2 fiber coupler join, described optical fiber collimator two also joins with closed container, and described closed container also joins with photo-detector.
Above-mentioned a kind of gas sensing device, it is characterized in that: described wavelength monitoring module is by the 1X2 fiber coupler, optical fiber collimator two and the closed container and the shaped form housing that is spirally wound on the closed container outer wall that are used to comprise gas to be measured, be respectively arranged with a plurality of distortion teeth one and a plurality of distortion tooth two on inboard two the relative faces of described shaped form housing, described distortion tooth one is staggered corresponding laying between the tooth two with distortion, described 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 described distortion tooth one and the distortion tooth two, described signal optical fibre connects test cell by extended fiber, and described test cell and lock-in amplifier join.
Above-mentioned a kind of gas sensing device is characterized in that: described signal optical fibre one end is provided with light reflecting device, and 1 mouthful of the described signal optical fibre other end and 1X2 fiber coupler is connected, and 2 mouthfuls of described 1X2 fiber coupler are connected with test cell.
Above-mentioned a kind of gas sensing device is characterized in that: described light reflecting device is catoptron or fiber grating.
Above-mentioned a kind of gas sensing device is characterized in that: described pulsed laser source below is provided with heating/refrigerator, is connected with temperature controller between described heating/refrigerator and the processing unit.
Above-mentioned a kind of gas sensing device is characterized in that: described air chamber upper end is provided with the air chamber window, and described optical fiber collimator one lower end is provided with filter plate.
The utility model compared with prior art has the following advantages:
1, gas measuring device of the present utility model 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 utility model, change by the optical maser wavelength that adopts wavelength monitoring module monitors pulsed laser source to send, 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 utility model is simple in structure, reasonable in design, processing and fabricating convenient and have low cost and other advantages, by adopting the wavelength monitoring module, has guaranteed precision of test result, makes device of the present utility model have good use prospect.
Below by drawings and Examples, the utility model is described in further detail.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment 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
A kind of gas sensing device as shown in Figure 1, comprise the air chamber 10 that is used to receive gas 14 to be measured, be fixedly mounted on optical fiber collimator one 22-1 and the vibration detection device 2 that is fixedly connected on air chamber 10 shells of air chamber 10 upper ends, described air chamber 10 lower sides are provided with import 8, described air chamber 10 upper portion side wall are provided with outlet 9, described optical fiber collimator one 22-1 upper end joins with an end of Transmission Fibers 23, the other end of described Transmission Fibers 23 connects pulsed laser source 25, described pulsed laser source 25 is the connection processing device also, described treating apparatus comprises and is used for gating pulse lasing light emitter 25 with the frequency generator 40 of certain frequency emission laser be used for determining the processing unit 50 of gas concentration, described frequency generator 40 joins with processing unit 50, described frequency generator 40 also joins with pulsed laser source 25, described processing unit 50 also connects lock-in amplifier 7, described lock-in amplifier 7 joins by transmission line 3 and vibration detection device 2, described Transmission Fibers 23 is provided with wavelength monitoring module 12, and described wavelength monitoring module 12 is joined by lead 11 and processing unit 50.
In the present embodiment, as shown in Figure 2, described wavelength monitoring module 12 is made up of 1X2 fiber coupler 45, fiber grating 16 and photo- detector 15,1 mouthful of described 1X2 fiber coupler 45 by Transmission Fibers 23 connection pulsed laser sources 25, a port in 2 mouthfuls of described 1X2 fiber coupler 45 connects air chamber 10 by Transmission Fibers 23,2 mouthfuls the another port and the fiber grating 16 of described 1X2 fiber coupler 45 join, described fiber grating 16 also joins with photo-detector 15, and described photo-detector 15 also joins with lock-in amplifier 7.
Described pulsed laser source 25 belows are provided with heating/refrigerator 30, are connected with temperature controller 31 between described heating/refrigerator 30 and the processing unit 50.Described air chamber 10 upper ends are provided with air chamber window 20, and described optical fiber collimator one 22-1 lower end is provided with filter plate 21.
Preferably, described fiber grating 16 is More's fiber grating, the centre of homology wavelength of described 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, the laser power that enters on the photo-detector 15 is reduced, photo-detector 15 passes to processing unit 50 with this information by lead 11, processing unit 50 is adjusted pulsed laser source 25 emitted laser wavelength by instruction control frequency generator 40 and temperature controller 31, make pulsed laser source 25 emitted laser wavelength locking on preset wavelength, 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, 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 enters on the photo-detector 15 is increased, photo-detector 15 passes to processing unit 50 with this information by lead 11, processing unit 50 is adjusted lasing light emitter 25 emitted laser wavelength locking on preset wavelength by 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 described 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, described Transmission Fibers 23 as 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, described Transmission Fibers 23 external packets are covered with waterproof material, as 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, described wavelength monitoring module 12 is by 1X2 fiber coupler 45, optical fiber collimator two 22-2 and photo-detector 15 and the closed container 18 4 parts composition that is used to comprise gas 14 to be measured, 1 mouthful of described 1X2 fiber coupler 45 by Transmission Fibers 23 connection pulsed laser sources 25, a port in 2 mouthfuls of described 1X2 fiber coupler 45 connects air chamber 10 by Transmission Fibers 23,2 mouthfuls the another port and optical fiber collimator two 22-2 of described 1X2 fiber coupler 45 join, described optical fiber collimator two 22-2 also join with closed container 18, and described closed container 18 also joins with photo-detector 15.
When pulsed laser source 25 emitted laser wave length shifts, comprise the absorption of gas 14 meeting minimizings to be measured in the closed container 18 to lasing light emitter 25 emitted laser, make and enter laser power increase on the photo-detector 15, photo-detector 15 passes to processing unit 50 with this information by lead 11, processing unit 50 is adjusted lasing light emitter 25 emitted laser wavelength locking on preset wavelength by 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, as quartz glass, low bulk metal material, pottery or other compound substance.
Shown in Figure 4 and 5, in the present embodiment, described wavelength monitoring module 12 is by 1X2 fiber coupler 45, optical fiber collimator two 22-2 and the closed container 18 and the shaped form housing 4 that is spirally wound on closed container 18 outer walls that are used to comprise gas 14 to be measured, be respectively arranged with a plurality of distortion tooth one 4-1 and a plurality of distortion tooth two 4-2 on described shaped form housing 4 inboard two relative faces, be staggered corresponding laying between described distortion tooth one 4-1 and distortion tooth two 4-2, described 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 described distortion tooth one 4-1 and distortion tooth two 4-2, described signal optical fibre 6 connects test cell 5 by extended fiber 1, and described 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 by 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 by lead 11, processing unit 50 is adjusted pulsed laser source 25 emitted laser wavelength locking on preset wavelength by 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, described signal optical fibre 6 one ends are provided with light reflecting device, 1 mouthful of described signal optical fibre 6 other ends and 1X2 fiber coupler 45 is connected, and 2 mouthfuls of described 1X2 fiber coupler 45 are connected with test cell 5, and described light reflecting device is catoptron or fiber grating.
Preferably, described closed container 18 adopts the material of low temperature expansion coefficient, as quartz glass, low bulk metal material, pottery or other compound substance.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.
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 vibration detection device (2) on air chamber (10) shell, described air chamber (10) lower sides is provided with import (8), described air chamber (10) upper portion side wall is provided with outlet (9), described optical fiber collimator one (22-1) upper end joins with an end of Transmission Fibers (23), the other end of described Transmission Fibers (23) connects pulsed laser source (25), described pulsed laser source (25) is the connection processing device also, described treating apparatus comprises and is used for gating pulse lasing light emitter (25) with the frequency generator (40) of certain frequency emission laser be used for the processing unit (50) of definite gas concentration, described frequency generator (40) joins with processing unit (50), described frequency generator (40) also joins with pulsed laser source (25), described processing unit (50) also connects lock-in amplifier (7), described lock-in amplifier (7) joins by transmission line (3) and vibration detection device (2), it is characterized in that: described Transmission Fibers (23) is provided with wavelength monitoring module (12), and described wavelength monitoring module (12) is joined by 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: described wavelength monitoring module (12) is by 1X2 fiber coupler (45), fiber grating (16) and photo-detector (15) are formed, 1 mouthful of described 1X2 fiber coupler (45) by Transmission Fibers (23) connection pulsed laser source (25), a port in 2 mouthfuls of described 1X2 fiber coupler (45) connects air chamber (10) by Transmission Fibers (23), 2 mouthfuls the another port and the fiber grating (16) of described 1X2 fiber coupler (45) join, described fiber grating (16) also joins with photo-detector (15), and described 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 described 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: described fiber grating (16) is More's fiber grating, and the centre of homology wavelength of described 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: described wavelength monitoring module (12) is by 1X2 fiber coupler (45), optical fiber collimator two (22-2) and photo-detector (15) and being used to comprises closed container (18) four parts of gas to be measured (14) and forms, 1 mouthful of described 1X2 fiber coupler (45) by Transmission Fibers (23) connection pulsed laser source (25), a port in 2 mouthfuls of described 1X2 fiber coupler (45) connects air chamber (10) by Transmission Fibers (23), 2 mouthfuls the another port and the optical fiber collimator two (22-2) of described 1X2 fiber coupler (45) join, described optical fiber collimator two (22-2) also joins with closed container (18), and described 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: described 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 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 described shaped form housing (4), be staggered corresponding laying between described distortion tooth one (4-1) and distortion tooth two (4-2), described 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 described distortion tooth one (4-1) and the distortion tooth two (4-2), described signal optical fibre (6) connects test cell (5) by extended fiber (1), and described 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: described signal optical fibre (6) one ends are provided with light reflecting device, 1 mouthful of described signal optical fibre (6) other end and 1X2 fiber coupler (45) is connected, and 2 mouthfuls of described 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: described 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: described pulsed laser source (25) below is provided with heating/refrigerator (30), is connected with temperature controller (31) between described 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: described air chamber (10) upper end is provided with air chamber window (20), and described optical fiber collimator one (22-1) lower end is provided with filter plate (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206587191U CN201974366U (en) | 2010-12-15 | 2010-12-15 | Gas sensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206587191U CN201974366U (en) | 2010-12-15 | 2010-12-15 | Gas sensing device |
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| Publication Number | Publication Date |
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| CN201974366U true CN201974366U (en) | 2011-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206587191U Expired - Fee Related CN201974366U (en) | 2010-12-15 | 2010-12-15 | Gas sensing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967566A (en) * | 2012-11-14 | 2013-03-13 | 广东汉唐量子光电科技有限公司 | High-precision and high-speed trace analysis device |
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2010
- 2010-12-15 CN CN2010206587191U patent/CN201974366U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967566A (en) * | 2012-11-14 | 2013-03-13 | 广东汉唐量子光电科技有限公司 | High-precision and high-speed trace analysis device |
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Granted publication date: 20110914 Termination date: 20111215 |