CN103472001B - Photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber - Google Patents
Photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber Download PDFInfo
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- CN103472001B CN103472001B CN201310451111.XA CN201310451111A CN103472001B CN 103472001 B CN103472001 B CN 103472001B CN 201310451111 A CN201310451111 A CN 201310451111A CN 103472001 B CN103472001 B CN 103472001B
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Abstract
Photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber, belongs to gas detection with optical fiber field.Comprise pump light source, rare-earth doped optical fibre, Q-switch etc., wherein wavelength division multiplexer, rare-earth doped optical fibre, optoisolator, insert input, the air chamber of output coupling mirror, Q-switch, fiber coupler composition pulse optical fiber ring cavity; Quartz tuning-fork is positioned in air chamber, for the acoustic signals that pulse laser energizing gas in detection optical fiber laser chamber produces; The signal that quartz tuning-fork detects is extracted further by lock-in amplifier, and is transferred to computing machine by data collecting card acquisition, obtains gas concentration information after doing gas concentration inverting.Combine Fiber laser technology and optoacoustic spectroscopy gas detection technology, present system has the features such as high sensitivity, high performance-price ratio, cost be low.
Description
Technical field
The present invention relates to photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber, namely relate to a kind of intracavity, based on the gas detecting system of optoacoustic spectroscopy gas detection technology, belong to gas detection with optical fiber field.
Technical background
In industrial processes, often need to carry out qualitative even quantitative test to guarantee production safety to some gas.Highly sensitive gas-detecting device is then needed for some trace gas, at present, conventional gas detection method mainly contains electrochemical process, infra-red sepectrometry and vapor-phase chromatography etc., wherein infra-red sepectrometry receives much concern always, and its gordian technique has Spectrographic absorption techniques, Difference Absorption technology, Difference Absorption technology, harmonic detecting technique, intracavity spectral absorption technology and optoacoustic spectroscopy based on length scanning.Traditional absorption techniques is limited because gas effectively absorbs light path, so its detection sensitivity can not be very high; Air chamber is placed in resonant cavity of fibre-optical laser by intracavity spectral absorption technology, utilize the round vibration of laser greatly to increase gas and effectively absorb light path, but this technology still relies on wavelength-scanning technique, atomic weak useful signal need be extracted in strong background noise, make to improve detection sensitivity and be subject to certain restrictions; The luminous energy that the direct measurement gas of optoacoustic spectroscopy detection technique absorbs, can detect atomic weak absorption, have higher sensitivity, but existing research is all that coupling process loss is luminous energy greatly based on the laser of finished product laser instrument coupling output as excitation source.
" Chinese laser ", 2009, 36 volume 9 phases, 2384-2387 page, author is Jia great Gong, Liu Kun, well literary talent, Wang Yan, Zhang Hongxia, Zhang Yimo, the article being entitled as " gas detection method based on ring cavity fiber laser " proposes a kind of gas detecting system based on the design of fiber laser inner chamber, this system adopts wavelength-scanning technique to make fiber laser output wavelength cover multiple gas absorption peak, corresponding gas concentration is drawn by the method for averaging to many absorption peaks inverting concentration, the method promotes in detection sensitivity and precision all to some extent relative to utilizing single absorption peak, but inherently there is the low defect of sensitivity based on the Spectrographic absorption of wavelength-scanning technique, and traditional air chamber generally can not do too little for increasing effectively its size of absorption light path, this will make to there is bulky shortcoming when future forms product.
Summary of the invention
For overcoming the deficiency of existing correlation technique, the present invention devises photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber.
Present system is realized by following technical scheme:
Photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber, comprises pump light source, wavelength division multiplexer, rare-earth doped optical fibre, optoisolator, air chamber, input coupling mirror, output coupling mirror, quartz tuning-fork, Q-switch, fiber coupler, photodetector, data collecting card, lock-in amplifier, computing machine; It is characterized in that described pump light source exports the corresponding input end of termination wavelength division multiplexer, one end of wavelength division multiplexer compound termination rare-earth doped optical fibre, another termination optoisolator input end of rare-earth doped optical fibre; The optical axis alignment of input coupling mirror and output coupling mirror is positioned over the front and back end in air chamber respectively; Optoisolator exports the input coupling mirror placed in termination air chamber, output coupling mirror connects the input end of Q-switch, the input end of the output termination fiber coupler of Q-switch, fiber coupler light splitting be 90% one export another input end corresponding to termination wavelength division multiplexer, fiber coupler light splitting be 10% one export termination photodetector light input end; Photo detector signal exports the analog input end A of termination data collecting card; Quartz tuning-fork is placed between input coupling mirror in air chamber and output coupling mirror, the signal output part of quartz tuning-fork connects lock-in amplifier signal input part, the analog output B of the reference signal input termination data collecting card of lock-in amplifier, the analog input end B of the output termination data collecting card of lock-in amplifier; The analog output A of data collecting card connects the control input end of Q-switch; The signal input port of data collecting card is connected to computing machine by data line;
Described wavelength division multiplexer, rare-earth doped optical fibre, optoisolator, insert input, ring cavity that the air chamber of output coupling mirror, Q-switch, fiber coupler form fiber laser.
Described pump light source is semiconductor laser.
Described rare-earth doped optical fibre is Er-doped fiber or Yb dosed optical fiber or thulium doped fiber or erbium-ytterbium co-doped fiber.
Described quartz tuning-fork is the cylindricality crystal oscillator that 32.768KHz sloughs vacuum shell.
Described photodetector is in-Ga-As photoelectric detector.
Described Q-switch, wavelength division multiplexer, optoisolator, fiber coupler, input coupling mirror, output coupling mirror are general commercial laser Q-switching technology, Fibre Optical Sensor or optical communication device.
Described is positioned at fiber laser ring cavity inside for the quartz tuning-fork detecting photoacoustic signal, and photoacoustic signal results from fiber laser cavity; And pulse strength exports pulse strength greatly than laser instrument in fiber laser cavity, the photoacoustic signal that the photoacoustic signal therefore produced in chamber can excite outside chamber compared with Output of laser is strong, and detection sensitivity is high.
Described air chamber can be accomplished very little, needs sample gas under study little.
During native system work, wavelength division multiplexer, rare-earth doped optical fibre, optoisolator, insert the ring cavity of input, the air chamber of output coupling mirror, Q-switch, fiber coupler formation fiber laser; The pulse signal that data collecting card exports certain frequency controls Q-switch break-make, realizes adjusting Q process, makes the laser pulse forming respective frequencies in laser chamber; Endovenous laser is coupled into air chamber through input coupling mirror, and transfers to output coupling mirror, by this coupling mirror coupled transfer to tunable optic filter input end by the gap between quartz tuning-fork fork stock; The stabilized lasers part that fiber laser is formed returns ring cavity through the output terminal that fiber coupler splitting ratio is 90% and participates in vibration, the output terminal that another part laser is 10% by fiber coupler splitting ratio exports photodetector to, again through data collecting card collection, as the use of Laser output monitoring, normalization reference; Air chamber is built with gas to be measured, and pitch the laser pulse exciting light acoustic effect between stock through quartz tuning-fork, quartz tuning-fork detects the acoustic signals produced, and Signal transmissions is carried out harmonic detecting to lock-in amplifier; The data of acquisition and necessary reference data are transferred to computing machine by data collecting card, do further Inversion Calculation, draw corresponding gas concentration.
Advantage of the present invention:
First, air chamber is placed in the inner laser energy taking full advantage of a laser instrument and can produce of fiber laser, and can detection signal strength be improved; Secondly, the optoacoustic spectroscopy gas detection technology with high detection sensitivity is applied in intracavity gas detection system, improves the detection sensitivity of whole system further; 3rd, the optoacoustic spectroscopy detection technique based on quartz tuning-fork needs the sample gas of minute quantity; 4th, the constituent components majority of system commonly uses device for Fibre Optical Sensor and optical communication, and its cost is low.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the gas detecting system that the present invention relates to.
Wherein: 1, pump light source, 2, wavelength division multiplexer, 3, rare-earth doped optical fibre, 4, optoisolator, 5, air chamber, 6, quartz tuning-fork, 7, Q-switch, 8, fiber coupler, 9, photodetector, 10, data collecting card, 11, lock-in amplifier, 12, computing machine, 13, input coupling mirror, 14 output coupling mirrors.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described, but be not limited thereto.
Embodiment 1:
As shown in Figure 1, photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber, comprise pump light source 1, wavelength division multiplexer 2, rare-earth doped optical fibre 3, optoisolator 4, air chamber 5, input coupling mirror 13, output coupling mirror 14, quartz tuning-fork 6, Q-switch 7, fiber coupler 8, photodetector 9, data collecting card 10, lock-in amplifier 11, computing machine 12, it is characterized in that pump light source 1 exports the corresponding input end of termination wavelength division multiplexer 2, one end of wavelength division multiplexer 2 compound termination rare-earth doped optical fibre 3, another termination optoisolator 4 input end of rare-earth doped optical fibre 3, optoisolator 4 exports the input coupling mirror 13 placed in termination air chamber 5, input coupling mirror 13 is positioned over the front and back end in air chamber 5 respectively with the optical axis alignment of output coupling mirror 14, output coupling mirror 14 connects the input end of Q-switch 7, the input end of the output termination fiber coupler 8 of Q-switch 7, fiber coupler 8 splitting ratio is another input end of output termination wavelength division multiplexer 2 correspondence of 90%, and fiber coupler 8 splitting ratio is the light input end of an output termination photodetector 9 of 10%, photodetector 9 signal output part meets the analog input end A of data collecting card 10, quartz tuning-fork 6 is placed between input coupling mirror 13 in air chamber and output coupling mirror 14, the signal output part of quartz tuning-fork 6 connects lock-in amplifier 11 signal input part, the analog output B of the reference signal input termination data collecting card 10 of lock-in amplifier 11, the analog input end B of the output termination data collecting card 10 of lock-in amplifier 11, the analog output A of data collecting card 10 connects the control input end of Q-switch 7, the signal input port of data collecting card 10 is connected to computing machine 12 by data line,
Described wavelength division multiplexer 2, rare-earth doped optical fibre 3, optoisolator 4, insert input, ring cavity that the air chamber 5 of output coupling mirror 13,14, Q-switch 7, fiber coupler 8 form fiber laser.
Described pump light source 1 is semiconductor laser.
Described rare-earth doped optical fibre 3 is Er-doped fiber.
Described quartz tuning-fork 6 sloughs the cylindricality crystal oscillator of vacuum shell for 32.768KHz.
Described photodetector 9 is in-Ga-As photoelectric detector.
Embodiment 2:
Identical with embodiment 1, just described rare-earth doped optical fibre 3 is Yb dosed optical fiber.
Embodiment 3:
Identical with embodiment 1, just described rare-earth doped optical fibre 3 is thulium doped fiber.
Embodiment 4:
Identical with embodiment 1, just described rare-earth doped optical fibre 3 is erbium-ytterbium co-doped fiber.
Claims (5)
1. a photoacoustic spectroscopy gas detecting system in Q adjusting optical fiber laser chamber, comprises pump light source, wavelength division multiplexer, rare-earth doped optical fibre, optoisolator, air chamber, input coupling mirror, output coupling mirror, quartz tuning-fork, Q-switch, fiber coupler, photodetector, data collecting card, lock-in amplifier and computing machine; It is characterized in that described pump light source exports the corresponding input end of termination wavelength division multiplexer, one end of wavelength division multiplexer compound termination rare-earth doped optical fibre, another termination optoisolator input end of rare-earth doped optical fibre; The optical axis alignment of input coupling mirror and output coupling mirror is positioned over the front and back end in air chamber respectively; Optoisolator exports the input coupling mirror placed in termination air chamber, output coupling mirror connects the input end of Q-switch, the input end of the output termination fiber coupler of Q-switch, fiber coupler light splitting be 90% one export another input end corresponding to termination wavelength division multiplexer, fiber coupler light splitting be 10% one export termination photodetector light input end; Photo detector signal exports the analog input end A of termination data collecting card; Quartz tuning-fork is placed between input coupling mirror in air chamber and output coupling mirror, the signal output part of quartz tuning-fork connects lock-in amplifier signal input part, the analog output B of the reference signal input termination data collecting card of lock-in amplifier, the analog input end B of the output termination data collecting card of lock-in amplifier; The analog output A of data collecting card connects the control input end of Q-switch; The signal input port of data collecting card is connected to computing machine by data line;
Described wavelength division multiplexer, rare-earth doped optical fibre, optoisolator, insert input, ring cavity that the air chamber of output coupling mirror, Q-switch, fiber coupler form fiber laser.
2. photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber as claimed in claim 1, is characterized in that described pump light source is semiconductor laser.
3. photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber as claimed in claim 1, is characterized in that described rare-earth doped optical fibre is Er-doped fiber or Yb dosed optical fiber or thulium doped fiber or erbium-ytterbium co-doped fiber.
4. photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber as claimed in claim 1, is characterized in that described quartz tuning-fork is the cylindricality crystal oscillator that 32.768KHz sloughs vacuum shell.
5. photoacoustic spectroscopy gas detecting system in a kind of Q adjusting optical fiber laser chamber as claimed in claim 1, is characterized in that described photodetector is in-Ga-As photoelectric detector.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105548023B (en) * | 2015-12-28 | 2019-04-02 | 哈尔滨工业大学 | A kind of evanescent wave type optoacoustic spectroscopy minimum gas sensor and measurement method based on fiber resonance cavity |
| WO2018119671A1 (en) | 2016-12-27 | 2018-07-05 | 深圳大学 | Measurement device and measurement method for concentration of contaminants in water |
| CN107064012B (en) | 2017-04-11 | 2019-06-25 | 山西大学 | Quartz enhanced photoacoustic spectroscopy gas-detecting device and method based on beat effect |
| CN107543794A (en) * | 2017-09-11 | 2018-01-05 | 山东大学 | Photoacoustic spectroscopy gas detecting system based on double grating Q adjusting optical fiber laser |
| CN108226047A (en) * | 2017-12-29 | 2018-06-29 | 山东大学 | Optoacoustic spectroscopy multiple spot gas detecting system based on optical fiber laser annular cavity |
| CN113155741B (en) * | 2020-01-22 | 2022-06-24 | 中国海洋大学 | Wavelength scanning Q-switching photoacoustic spectroscopy gas detection system with self-adjusting and self-checking functions of quartz tuning fork and application of wavelength scanning Q-switching photoacoustic spectroscopy gas detection system |
| CN114414517B (en) * | 2021-12-17 | 2024-02-20 | 山东微感光电子有限公司 | Low-power-consumption intrinsic safety type laser carbon monoxide sensing control method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684059A (en) * | 2012-04-20 | 2012-09-19 | 中国科学院半导体研究所 | Tunable laser frequency stabilizing device capable of reinforcing gas photoacoustic spectroscopy on basis of quartz tuning fork |
| CN103093107A (en) * | 2013-01-25 | 2013-05-08 | 武汉工程大学 | Method used for single exploration engineering ore body boundary delineation |
| CN203519484U (en) * | 2013-09-27 | 2014-04-02 | 山东大学 | Photoacoustic spectrometry gas detection system in cavity of Q-switched optical fiber laser |
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| US7245380B2 (en) * | 2002-06-10 | 2007-07-17 | William Marsh Rice University | Quartz-enhanced photoacoustic spectroscopy |
| CN203519485U (en) * | 2013-09-27 | 2014-04-02 | 山东大学 | Detection system for photoacoustic spectrometry gas in optical fiber laser cavity |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684059A (en) * | 2012-04-20 | 2012-09-19 | 中国科学院半导体研究所 | Tunable laser frequency stabilizing device capable of reinforcing gas photoacoustic spectroscopy on basis of quartz tuning fork |
| CN103093107A (en) * | 2013-01-25 | 2013-05-08 | 武汉工程大学 | Method used for single exploration engineering ore body boundary delineation |
| CN203519484U (en) * | 2013-09-27 | 2014-04-02 | 山东大学 | Photoacoustic spectrometry gas detection system in cavity of Q-switched optical fiber laser |
Non-Patent Citations (2)
| Title |
|---|
| "掺镱包层光纤激光器的全光纤调Q技术";宁继平等;《中国激光》;20080430;第35卷(第4期);第384页第2部分 * |
| "环腔掺铒光纤激光器应用于气体传感的理论和实验研究";马凤;《中国优秀硕士学位论文全文数据库 信息科技辑》;20111215(第52期);第18页第3.1节、第19页第3.2.1节、第20页第3.2.2节、第21页第3.2.4节及附图3-1和3-3 * |
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