CN102374970A - Corrugated-pipe-shaped optical fiber gas sensing device - Google Patents
Corrugated-pipe-shaped optical fiber gas sensing device Download PDFInfo
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- CN102374970A CN102374970A CN2010102644344A CN201010264434A CN102374970A CN 102374970 A CN102374970 A CN 102374970A CN 2010102644344 A CN2010102644344 A CN 2010102644344A CN 201010264434 A CN201010264434 A CN 201010264434A CN 102374970 A CN102374970 A CN 102374970A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 58
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
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- 238000004867 photoacoustic spectroscopy Methods 0.000 description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
Abstract
The invention discloses a corrugated-pipe-shaped optical fiber gas sensing device based on a photoacoustic spectroscopic technique, which comprises a laser source (25), a frequency generator (40) for controlling the light-emitting frequency of the laser source (25), a lock-in amplifier (7) and a processing unit (50) for calculating gas concentration. The corrugated-pipe-shaped optical fiber gas sensing device is characterized in that a gas chamber (10) is of a corrugated-pipe-shaped structure. Since the change of the air chamber (10) under the acoustic pressure wave of gas to be tested leads to the change of the distance between side-A deformable teeth (3) and side-B deformable teeth (4) which are distributed on two opposite surfaces of the pipe wall of the corrugated-pipe-shaped air chamber (10), the bending curvature of signal optical fibers (6) which are clamped between the side-A deformable teeth and the side-B deformable teeth is changed, the microbending losses of the signal optical fibers (6) are changed, the change can be detected by a testing unit (5) and finally the processing unit (50) calculates to obtain the concentration of the gas to be tested. The device has the advantages of high accuracy, low cost, easiness in multiplexing and networking and broad application prospect.
Description
Technical field
The present invention relates to the method and apparatus of optoacoustic spectroscopy gas sensing, or rather, relate to a kind of device that utilizes the bellows of bending loss of optical fiber change-detection photoacoustic signal.The invention belongs to technical field of optical fiber sensing, be mainly used in the concentration sensing detection of gaseous material.
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, and like first technology: United States Patent(USP) No. 4740086 has been 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.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.
Fibre Optical Sensor since have anti-electromagnetic interference (EMI), highly sensitive, electrical insulating property good, safe and reliable, corrosion-resistant, be convenient to plurality of advantages such as multiplexing networking, thereby broad prospect of application is all arranged in each fields such as industry, agricultural, biologic medical, national defence.For optoacoustic gas sensing principle and optical fiber sensing technology are combined, integrated both advantage forms novel optical fiber optoacoustic gas sensing technology, and people have proposed some technical schemes.Formerly two of technology: " based on the fiber gas sensor research of photocaustic spectroscopy ", Chinese laser, the 31st volume; The 8th phase, in 2004, proposed a kind ofly to adopt optical fiber mach Ceng Degan to relate to phase detector to replace traditional microphonic scheme; One arm of optical fiber mach Zehnder interferometer is wrapped in the outer wall of optoacoustic air cavity, and when gas absorption luminous energy produces the acoustic pressure Reeb, the acoustic pressure Reeb will make the vary in diameter of optoacoustic air cavity; Make winding optical fiber above that produce radial strain; Cause the phase change of light wave, change through Measurement Phase and come perception acoustic pressure Reeb to change, and then obtain gas concentration information.But; Owing to expand with heat and contract with cold; Variation of ambient temperature also can cause optoacoustic air cavity vary in diameter, and reference arm optical fiber can receive outer air-flow of optoacoustic air cavity and Influence of Temperature simultaneously, and the winding of optical fiber can produce birefringence; Thereby produce bigger and the irrelevant phase noise of gas absorption, cause that to measure sensitivity low poor with measurement stability.In addition, its exciting light source adopts dye laser, and volume is big; Intensity modulation adopts mechanical chopper, and frequency is low.Make the advantage of optical fiber sensing technology not be not fully exerted.
Chinese patent Granted publication CN 201034929Y has proposed a kind of vibrating diaphragm of placing induction acoustic pressure Reeb at photo acoustic gas cell one port; And the Fabry-Perot interferometer that constitutes through vibrating diaphragm and fiber end face detects acoustic pressure Reeb signal; Because faint this device that makes of vibrating diaphragm reflected signal is difficult for realizing monitoring at a distance; The demodulating equipment more complicated of interference signal also needs higher cost to accomplish in addition, thereby has limited the usable range of such sensor.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art; The present invention provides a kind of gas sensing device based on bending loss of optical fiber; It is simple in structure, reasonable in design, processing and fabricating is convenient and use-pattern is flexible, highly sensitive, result of use is good, and production, use, maintenance cost are low.
For solving the problems of the technologies described above; The technical scheme that the present invention adopts is: a kind of bellows fiber-optic fiber gas sensing apparatus; Comprise lasing light emitter 25 and be used to receive the air chamber 10 of wanting detected gas; It is characterized in that: air chamber 10 is structures of bellows, on relative two faces of the following recess of the tube wall of bellows air chamber 10, is laid with A side distortion tooth 3 and B side distortion tooth 4 respectively, A side distortion tooth 3 and B side distortion tooth 4 interlaced correspondences; A side distortion tooth 3 is out of shape the both sides that tooth 4 correspondences are laid in signal optical fibre 6 with the B side, and signal optical fibre 6 connects test cell 5 through extended fiber 1.
After gas to be measured such as methane get in the air chamber 10; The laser that includes the lasing light emitter 25 of gas absorption characteristic wavelength to be measured also is injected in the air chamber 10; The characteristic absorption wavelength of methane can be selected 1331nm or 1651nm for use; In air chamber 10; Gas to be measured can absorb the beam energy that lasing light emitter 25 injects; Thereby the temperature of gas to be measured can raise air chamber 10 pressure inside are increased; Distance between relative two faces of following recess of bellows air chamber 10 tube walls is increased, change thereby make respectively at A side distortion tooth 3 that said relative two faces are laid and the distance between the B side distortion tooth 4, the bending curvature that causes being clamped in the signal optical fibre 6 between A side distortion tooth 3 and the B side distortion tooth 4 changes; Test cell 5 obtains the variation of said air chamber 10 internal pressures through the variation of detection signal optical fiber 6 internal transmission optical signal powers; Be with A side distortion tooth 3 and B side distortion tooth 4 on relative two faces of the following recess of the tube wall that is laid in bellows air chamber 10 respectively, and to be clamped in the signal optical fibre 6 that both are out of shape between cog be the microphone element that the main sonic detection element that constitutes has replaced the public to know here, obtain the concentration of gas to be measured then through all the other testing processes that the public knew.
Described distortion tooth is distributed on the inwall of bellows air chamber 10.
Described distortion tooth is distributed on the outer wall of bellows air chamber 10.
Described air chamber 10 is bellows structures of helical structure.
End at described signal optical fibre 6 is mounted with light reflecting device, like light reflection mirror, fiber grating or at the end face plating reflectance coating of signal optical fibre, or only is that end face with signal optical fibre is treated to minute surface.
The other end of described signal optical fibre 61 mouthful through extended fiber and 1X2 optical branching device is connected 2 mouthfuls of stabilized light source and light power meters that connect the formation test cell respectively of 1X2 optical branching device.
Signal optical fibre 6 more than two or two on the different air chamber 10 is connected on an optical fiber.
The resonant frequency of described any two air chambers 10 is all inequality.
On the Transmission Fibers that connects between lasing light emitter 25 and the air chamber 10, be mounted with the 1XN optical branching device, an end of 1XN optical branching device N mouth is connected with a plurality of air chambers 10 through Transmission Fibers respectively.
On the Transmission Fibers that connects between lasing light emitter 25 and the air chamber 10, be mounted with the 1XN photoswitch, an end of 1XN photoswitch N mouth is connected with a plurality of air chambers 10 through Transmission Fibers respectively.
Said signal optical fibre 6 is for the outside optical fiber that is surrounded by the multilayer fibers protective seam, like tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Said signal optical fibre also can be plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber.
The present invention compared with prior art has the following advantages:
1, novel optical fiber gas measuring device of the present invention, it is convenient and use-pattern is flexible, highly sensitive to have simple in structure, reasonable in design, method of operating;
2, bellows fiber-optic fiber gas sensing apparatus of the present invention; Add microphone because of the air chamber 10 that uses bellows and integrated optical-fiber type microphone have substituted traditional air chamber, make this device have anti-electromagnetic interference (EMI), highly sensitive, electrical insulating property good, safe and reliable, corrosion-resistant, be convenient to plurality of advantages such as multiplexing networking;
3, bellows fiber-optic fiber gas sensing apparatus of the present invention; Because the light source that can adopt-luminous power method test audio frequency acquiring signal; Thereby can reduce the cost of test cell 5 significantly, thereby the whole cost of this device is reduced significantly, make this device have wide usable range.
4, bellows fiber-optic fiber gas sensing apparatus of the present invention owing to adopted bellows air chamber 10, reduces the optoacoustic resonant frequency of this air chamber 10 significantly, has increased precision of test result and sensitivity.
In sum, the present invention is simple in structure, reasonable in design, processing and fabricating is convenient and use-pattern is flexible, highly sensitive, result of use is good, and have cost low, be prone to advantages such as networking is multiplexing, make device of the present invention have good use prospect.
Through accompanying drawing and embodiment, the technical scheme of invention is done further detailed description below.
Description of drawings
Fig. 1 is the structural representation of the present invention's first embodiment.
Fig. 2 is the cross-sectional structure synoptic diagram of shaped form housing 4 in the present invention's first embodiment.
Fig. 3 is the structural representation of the present invention's second embodiment.
Fig. 4 is air chamber 10 local structure for amplifying synoptic diagram in the present invention's second embodiment.
Fig. 5 is the structural representation of the present invention's the 3rd embodiment.
Description of reference numerals:
| 1-extended fiber; | 2-corrugated tube tube wall; | The 5-test cell; |
| The 6-signal optical fibre; | The 7-lock-in amplifier; | The 8-import; |
| The 9-outlet; | The 10-air chamber; | 20-air chamber window; |
| The 21-filter plate; | The 22-optical fiber collimator; | The 23-Transmission Fibers; |
| The 25-lasing light emitter; | The 30-heating/cooling device; | The 31-temperature controller; |
| The 40-frequency generator; | The 45-1X2 optical branching device | The 46-light reflecting device; |
| 3-A side distortion tooth; | 4-B side distortion tooth; | The 50-processing unit. |
Embodiment
Embodiment 1
Like Fig. 1, shown in Figure 2; Among the present invention, comprise lasing light emitter 25 and be used to receive the air chamber 10 of wanting detected gas that particularly: at air chamber 10 is to be made up of corrugated tube; Be laid with a plurality of A side distortion teeth 3 and a plurality of B side distortion teeth 4 in corrugated tube tube wall 2 recessed relative both sides; Described A side distortion tooth 3 and B side distortion tooth 4 interleaved are laid, and A side distortion tooth 3 is out of shape the both sides that tooth 4 correspondences are laid in signal optical fibre 6 with the B side, and the extended fiber 1 that passes through of signal optical fibre 6 connects test cell 5.
The testing process of total system is: processing unit 50 makes temperature controller 31 control heating/refrigerators 30 that lasing light emitter 25 is in the stable temperature through instruction; Stable temperature makes the wavelength and the power of the light signal that lasing light emitter 25 sends relatively stable; Processing unit 50 makes frequency generator 40 control lasing light emitters 25 with certain frequency emission laser through instruction; This frequency is the resonant frequency of air chamber 10 and the common integral body that constitutes of attachment thereof, and gas to be measured gets in the air chamber 10 through air intake opening 8 like the air that is mixed with methane, and flows out air chamber through gas outlet 9; At this moment in the air chamber 10 air that is mixed with gas to be measured; The laser that includes the lasing light emitter 25 of gas absorption characteristic wavelength to be measured also is injected in the air chamber 10 through Transmission Fibers 23, wave filter 21 and air chamber window 20, and the characteristic absorption wavelength of methane can be selected 1331nm or 1651nm for use, in air chamber 10; Behind the beam energy that gas absorption lasing light emitter 25 to be measured injects; The temperature of gas to be measured raises air chamber 10 pressure inside is increased, and makes the relative both sides of the corrugated tube tube wall variable in distance of air chamber 10, and the distance that causes being laid between the distortion tooth of the relative both sides on the tube wall changes; So also can change the bending curvature that is clamped in relative both sides distortion between cog signal optical fibre 6; The variation that test cell 5 obtains said air chamber 10 internal pressures through the variation of detection signal optical fiber 6 internal transmission optical signal powers, and give lock-in amplifier 7 with data transfer, the frequency values that lock-in amplifier 7 is given through frequency generator 40 is handled the data of test cell 5 and is obtained the Reeb of the acoustic pressure accurately value of air chamber 10; And this value passed to processing unit 50, processing unit 50 calculates the concentration of gas to be measured.
Described air chamber 10 adopts the material of low temperature expansion coefficient, like quartz glass, teflon, pottery or other compound substances.
Can the signal optical fibre 6 on the different air chambers 10 more than two or two be connected on the optical fiber; Thereby reach the purpose that multiple spot is monitored gas to be measured, further scheme is the purpose that test cell 5 selects for use optical time domain reflection technology (OTDR) can accomplish accurate distribution tests, monitoring.
Also can be that resonant frequency with the different air chambers 10 more than two or two is set to different frequencies in advance; Processing unit 50 makes frequency generator 40 control lasing light emitters 25 with certain sweep frequency emission laser through instruction, and different air chambers is surveyed on different time; Also can be that the photoswitch that the Transmission Fibers 23 of the different air chambers 10 more than two or two is passed through 1XN is connected with lasing light emitter 25, different air chambers is surveyed on different time, thereby reached the purpose that multiple spot is monitored gas to be measured.
Said Transmission Fibers 23, signal optical fibre 6 are for the outside optical fiber that is surrounded by the multilayer fibers protective seam, like tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Said Transmission Fibers 23, signal optical fibre 6 also can be plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber.
Said Transmission Fibers 23, signal optical fibre 6 and extended fiber 1 external packets are covered with waterproof material; Like waterproofing unction; Can further prevent the erosion of hydrone, prolong the serviceable life of Transmission Fibers 23, signal optical fibre 6 and extended fiber 1 Transmission Fibers 23, signal optical fibre 6 and extended fiber 1.
Like Fig. 3, shown in Figure 4, in the present embodiment, different with embodiment 1 is: A side distortion tooth 3 and B side distortion tooth 4 are laid in recess under the outer wall of corrugated tube tube wall 2.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 5; In the present embodiment; Different with embodiment 1 is: an end of described signal optical fibre 6 is mounted with light reflecting device 46, and the other end of signal optical fibre 6 connects 1 mouthful of a 1X2 optical branching device 45 through extended fiber 1, and 2 mouthfuls of 1X2 optical branching device 45 connect test cell 5.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
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. bellows fiber-optic fiber gas sensing apparatus; Comprise lasing light emitter (25) and be used to receive the air chamber (10) of wanting detected gas; It is characterized in that: air chamber (10) is the structure of bellows; On relative two faces of the following recess of the tube wall of bellows air chamber (10), be laid with A side distortion tooth (3) respectively and be out of shape tooth (4) with the B side; A side distortion tooth (3) and the interlaced correspondence of B side distortion tooth (4), A side distortion tooth (3) and B side distortion tooth (4) correspondence are laid in the both sides of signal optical fibre 6, and signal optical fibre (6) connects test cell (5) through extended fiber (1).
2. according to the described bellows fiber-optic fiber gas of claim 1 sensing apparatus, it is characterized in that: described distortion tooth is distributed on the inwall of bellows air chamber (10).
3. according to the described bellows fiber-optic fiber gas of claim 1 sensing apparatus, it is characterized in that: described distortion tooth is distributed on the outer wall of bellows air chamber (10).
4. according to the described bellows fiber-optic fiber gas of claim 1 sensing apparatus, it is characterized in that: described air chamber (10) is the bellows structure of helical structure.
5. according to the described bellows fiber-optic fiber gas of claim 1 sensing apparatus, it is characterized in that: the end at described signal optical fibre (6) is mounted with light reflecting device (46).
6. according to the described bellows fiber-optic fiber gas of claim 5 sensing apparatus; It is characterized in that: the other end of described signal optical fibre (6) 1 mouthful through extended fiber (1) and 1X2 optical branching device (45) is connected 2 mouthfuls of stabilized light source and light power meters that connect formation test cell (5) respectively of 1X2 optical branching device (45).
7. according to the described bellows fiber-optic fiber gas of claim 1 sensing apparatus, it is characterized in that: the signal optical fibre (6) more than two or two on the different air chamber (10) is connected on an optical fiber.
8. according to the described bellows fiber-optic fiber gas of claim 7 sensing apparatus, it is characterized in that: the resonant frequency of described any two air chambers (10) is all inequality.
9. according to claim 7 or 8 described bellows fiber-optic fiber gas sensing apparatus; It is characterized in that: on the Transmission Fibers that connects between lasing light emitter (25) and the air chamber (10), be mounted with the 1XN optical branching device, an end of 1XN optical branching device N mouth is connected with a plurality of air chambers (10) through Transmission Fibers respectively.
10. according to claim 7 or 8 described bellows fiber-optic fiber gas sensing apparatus; It is characterized in that: on the Transmission Fibers that connects between lasing light emitter (25) and the air chamber (10), be mounted with the 1XN photoswitch, an end of 1XN photoswitch N mouth is connected with a plurality of air chambers (10) through Transmission Fibers respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102644344A CN102374970A (en) | 2010-08-17 | 2010-08-17 | Corrugated-pipe-shaped optical fiber gas sensing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102644344A CN102374970A (en) | 2010-08-17 | 2010-08-17 | Corrugated-pipe-shaped optical fiber gas sensing device |
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| CN102374970A true CN102374970A (en) | 2012-03-14 |
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| CN2010102644344A Pending CN102374970A (en) | 2010-08-17 | 2010-08-17 | Corrugated-pipe-shaped optical fiber gas sensing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879898A (en) * | 2012-09-29 | 2013-01-16 | 太原科技大学 | Automatic tunable system with multiple optical paths |
| CN108139319A (en) * | 2015-09-29 | 2018-06-08 | 辛特福特图有限公司 | Eliminate noise-type detector |
| 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 |
| CN114526808A (en) * | 2022-02-15 | 2022-05-24 | 中国航空工业集团公司北京长城计量测试技术研究所 | Infrasound airborne sound calibrating device |
-
2010
- 2010-08-17 CN CN2010102644344A patent/CN102374970A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879898A (en) * | 2012-09-29 | 2013-01-16 | 太原科技大学 | Automatic tunable system with multiple optical paths |
| CN108139319A (en) * | 2015-09-29 | 2018-06-08 | 辛特福特图有限公司 | Eliminate noise-type detector |
| 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 |
| CN114526808A (en) * | 2022-02-15 | 2022-05-24 | 中国航空工业集团公司北京长城计量测试技术研究所 | Infrasound airborne sound calibrating device |
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Application publication date: 20120314 |