CN105021588B - A kind of single light source CARS gas-detecting devices and method - Google Patents
A kind of single light source CARS gas-detecting devices and method Download PDFInfo
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Abstract
A kind of single light source CARS gas detecting systems, it is relevant with Raman active gas real-time online or offline inspection, the present invention uses coherent antistockes Raman spectroscopy technology, light source can be used as using single pump laser, a part for pumping laser is converted into stokes light in object gas Raman pond through stimulated Raman scattering, remainder is used as pump light and detection light, focused on altogether with stokes light in object gas pond to be measured at same position, CARS flashlights are produced in pump light, detection light and stokes light copolymerization Jiao Chu.The technical scheme can obtain the CARS signals of under test gas using a laser, can effectively reduce cost and system complexity.In addition, the present invention is using high pressure object gas filling Raman pond, the wavelength of the stokes light of generation can accurately meet detection demand, therefore need not calibrate Stokes optical wavelength as common CARS technologies, it is possible to decrease maintenance difficulties simultaneously improve accuracy of detection.
Description
Technical field
The present invention is a kind of single light source CARS gas detecting systems, is had with Raman active gas real-time online or offline inspection
Close, the present invention uses coherent antistockes Raman spectroscopy technology, light source, realization pair can be used as using a laser
The detection of gas with Raman active, reduces system complexity, and save system cost.
Background technology
The important technology that CARS spectrum (coherent anti-stokes raman scattering) technology is detected as gas, in industry
Production, the field such as environmental monitoring and science and techniques of defence has played great function.Two beams are used currently employed CARS spectral techniques more
Or multiple laser light source, wherein beam of laser is as pump light, and another beam of laser (typically being produced by dye laser or OPO) is made
For stokes light, beam of laser may be used again as detection light (or pump light is as detection light) according to situation difference,
Therefore at least two lasers or at least one laser and an OPO is needed to provide input laser.Current CARS technologies are adopted
Scheme problems faced has cost too high, and accurate tunable laser system maintenance is difficult and needs regular calibration etc.,
In view of the above-mentioned problems, the present invention proposes a kind of low cost simple CARS systems of use single light source, using the conduct of Raman gas pond
Stokes light generating device, the detection for realizing object gas to be measured is coordinated with pump laser.
The content of the invention
The cost existed for current CARS detection techniques is high, the problem such as difficult in maintenance, it is proposed that a kind of single light source
CARS gas detecting systems, realize the detection to Raman active gas.
The technical solution adopted by the present invention is as follows：
A kind of single light source CARS gas-detecting devices, including pump laser and the Raman pond for being filled with pure object gas,
Using single pump laser as light source, pumping laser produces stokes light in object gas Raman pond.Pumping laser
Device is located at one end of light path, has been sequentially placed condenser lens on the output light path of laser, has been filled with the drawing of pure object gas
Man Chi, beam splitter, condenser lens, under test gas pond, short-pass filter plate and detector, the path-splitting in beam splitter side are placed
There is two-phase Look mirror, pumping laser detector is placed with Stokes photo-detector on the path-splitting of dichroscope side.
The output light line focus lens focus of pump laser, injects filled with pure object gas from the light window that enters of Raman pond
Raman pond in, the light exported by Raman pond light-emitting window is transmitted through beam splitter, condenser lens focus on, under test gas pond side
Enter in light window injection under test gas pond, the light exported from the light-emitting window of under test gas pond or pipeline opposite side is filtered through short-pass
Wave plate is irradiated on detector；The light reflected by beam splitter is irradiated on pumping laser detector after being transmitted through two-phase Look mirror, and two
The illumination of phase Look mirror reflection is mapped on stokes light detector.
Using device of the present invention carry out CARS gas detections method be：Pure object gas is filled in Raman pond,
In under test gas pond, filling under test gas is detected；The CARS signal light intensity I of detector collection, pumping laser detector is adopted
The pumping light intensity Ip of collection, the stokes light light intensity Is of Stokes photo-detector collection；
The CARS signal light intensities of detector collection are I, and C is mole of the unit volume of object gas under test gas pond
Amount, I and Ip, Is, the relation between C isWherein K is apparatus function, is under test gas pond or pipe
Determine and obtain during the object gas that standard unit's Molar amount is filled in road.Visited using pumping photo-detector and stokes light
Survey device and monitor pumping light intensity and Stokes light intensity in real time respectively, detection accuracy can be improved.
, can also be close to Raman to eliminate influence of the issuable anti-Stokes light to result of detection in Raman pond
Chi Houfangchu places one high to anti-Stokes light anti-, pump light and the high saturating filter plate of stokes light, or uses one
Individual such filter plate as Raman pond output window.
The gas filled in Raman pond must be consistent with the object gas to be checked under test gas, but pressure is larger in Raman pond,
Typically can be between 1.5MPa-10MPa, the Raman active difference according under test gas is varied from, and is produced in the Raman pond
Stokes optical wavelength can accurately meet CARS detection requirement.
The remarkable advantage of the present invention is that, as light source, a part for the laser of laser output exists using a laser
Stokes light is converted into through stimulated Raman scattering in object gas Raman pond, remainder is as pump light and detects light, with
Stokes light is focused in object gas pond to be measured at same position altogether, in pump light, detection light and stokes light copolymerization
Jiao Chu produces CARS flashlights.The technical scheme can obtain the CARS signals of under test gas using a laser, can be effective
Reduce cost and system complexity.In addition, the present invention is using high pressure object gas filling Raman pond, the stokes light of generation
Wavelength can accurately meet detection demand, therefore Stokes optical wavelength need not be calibrated as common CARS technologies, can dropped
Low-maintenance difficulty simultaneously improves accuracy of detection.
In the technical solution adopted by the present invention, the CARS signal light wavelengths of object gas to be measured are than pump wavelength and Si Tuo
Gram this light wave length, therefore pump light and stokes light can be filtered out through short-pass filter plate, it is left pure CARS letters
Number light is received by detector.
Pump laser in the present invention should use high peak power pulse laser, its general power must up to megawatt with
On, the gas being filled with object gas Raman pond must be consistent with object gas to be measured, but its pressure is larger, typically can be
Between 1.5MPa-10MPa, the Raman active difference according under test gas is varied from.
Brief description of the drawings
Fig. 1 is single light source CARS gas detecting system structure charts involved in the present invention, in figure：1- high power pulsed lasers
Device, 2- condenser lenses, the pure object gas Raman ponds of 3-, 4- beam splitters, 5- two-phase Look mirrors, 6- pumping laser detectors, 7- Si supports
Gram this photo-detector, 8- condenser lenses, 9- under test gas pond or pipeline, 10- short-pass filter plates, 11-CARS photo-detectors.
Embodiment
The embodiment of Raman active gas of the present invention is illustrated below：
The output light line focus lens focus of pump laser, from Raman pond enter light window inject filled with pure object gas
Raman pond in, the light exported by Raman pond light-emitting window is transmitted through beam splitter, condenser lens focus on, under test gas pond side
Enter in light window injection under test gas pond, the light exported from the light-emitting window of under test gas pond or pipeline opposite side is filtered through short-pass
Wave plate is irradiated on detector；The light reflected by beam splitter is irradiated on pumping laser detector after being transmitted through two-phase Look mirror, and two
The illumination of phase Look mirror reflection is mapped on stokes light detector.
Embodiment 1
CH in the mixed gas pipeline produced using the present invention detection dry distillation of coal4The concentration of gas.
Using the 532nm laser of the YAG laser output through frequency multiplication as light source, pure 2MPa is filled in Raman pond first
Pure CH4Gas, will be filled with the pure CH of 1 atmospheric pressure in mixed gas pipeline to be measured4Gas, 532nm pumping laser line focuses
Lens 2 focus on pump light in object gas Raman pond 3, and the Stokes optical wavelength of generation is 629.7nm.Beam splitter 4 will
About 3% pumping laser and stokes light is reflexed in two-phase Look mirror 5, and wherein pump light is irradiated to pump through two-phase Look mirror 5
On Pu photo-detector 6, stokes light by two-phase Look mirror 5 reflect after incide on Stokes photo-detector 7, remainder
Pump light and the stokes light line focus lens 8 produced in Raman pond focus under test gas pipeline altogether, under test gas
Wavelength is produced in pipeline to be received by detector 11 after short-pass filter plate 10 for 460.5nm CARS flashlights.
Read the CARS signal light intensity I of the collection of CARS photo-detectors 11, the pumping light intensity that pumping laser detector 6 is gathered
Ip, the stokes light light intensity I that Stokes photo-detector 7 is gathereds；And according to known CH4The concentration of gas, by formulaTry to achieve apparatus function K.
Then by the pure CH in pipeline to be measured4Gas is bled off, and under test gas introduces pipeline to be measured, and other configurations condition is not
Become, the gas in gas piping to be measured is detected；According to the CARS signal light intensity I of the collection of CARS photo-detectors 11, pump
The pumping light intensity I that Pu laser detector 6 is gatheredp, the stokes light light intensity I that Stokes photo-detector 7 is gathereds；And on quoting
The apparatus function K that one step is obtained, it is possible to by formulaCalculate the CH under test gas4Concentration.
The remarkable advantage of the present invention is that, as light source, a part for the laser of laser output exists using a laser
Stokes light is converted into through stimulated Raman scattering in object gas Raman pond, remainder is as pump light and detects light, with
Stokes light is focused in object gas pond to be measured at same position altogether, in pump light, detection light and stokes light copolymerization
Jiao Chu produces CARS flashlights.The technical scheme can effectively reduce cost and system complexity, and the Stokes produced
The wavelength of light can accurately meet CARS detection demands, therefore need not calibrate wavelength, it is possible to decrease maintenance difficulties simultaneously improve detection essence
Degree.Pumping photo-detector 6 and Stokes photo-detector 7 can use APD photodiodes, the pumping light intensity real-time monitored and
Stokes light intensity can be used as signal calibration foundation.In addition, the present invention is using high pressure object gas filling Raman pond, generation this
The wavelength of lentor light can accurately meet detection demand, therefore need not calibrate Stokes light wave as common CARS technologies
It is long, it is possible to decrease maintenance difficulties simultaneously improve accuracy of detection.
Embodiment 2
The O in the tail gas that certain experimental provision is produced is detected using the present invention2Gas concentration.
Using the 532nm laser of the YAG laser output through frequency multiplication as light source, pure 5MPa is filled in Raman pond first
Pure O2Gas, will be filled with the pure O of 1 atmospheric pressure in mixed gas pipeline to be measured2Gas, 532nm pumping laser line focuses are saturating
Mirror 2 focuses on pump light in object gas Raman pond 3, and the Stokes optical wavelength of generation is 580nm.Beam splitter 4 will about 2%
Pumping laser and stokes light reflex in two-phase Look mirror 5, wherein pump light through two-phase Look mirror 5 be irradiated to pump light visit
Survey device 6 on, stokes light by two-phase Look mirror 5 reflect after incide on Stokes photo-detector 7, the pump light of remainder
Under test gas pipeline is focused on altogether with the stokes light line focus lens 8 produced in Raman pond, under test gas pipeline
Wavelength is produced to be received by detector 11 after short-pass filter plate 10 for 491nm CARS flashlights.
Read the CARS signal light intensity I of the collection of CARS photo-detectors 11, the pumping light intensity that pumping laser detector 6 is gathered
Ip, the stokes light light intensity I that Stokes photo-detector 7 is gathereds；And according to known O2The concentration of gas, by formulaTry to achieve apparatus function K.
Then by the pure O in pipeline to be measured2Gas is bled off, and under test gas introduces pipeline to be measured, and other configurations condition is not
Become, the gas in gas piping to be measured is detected；According to the CARS signal light intensity I of the collection of CARS photo-detectors 11, pump
The pumping light intensity I that Pu laser detector 6 is gatheredp, the stokes light light intensity I that Stokes photo-detector 7 is gathereds；And on quoting
The apparatus function K that one step is obtained, it is possible to by formulaCalculate the O under test gas2Concentration.
The remarkable advantage of the present invention is that, as light source, a part for the laser of laser output exists using a laser
Stokes light is converted into through stimulated Raman scattering in object gas Raman pond, remainder is as pump light and detects light, with
Stokes light is focused in object gas pond to be measured at same position altogether, in pump light, detection light and stokes light copolymerization
Jiao Chu produces CARS flashlights.The technical scheme can effectively reduce cost and system complexity, and the Stokes produced
The wavelength of light can accurately meet CARS detection demands, therefore need not calibrate wavelength, it is possible to decrease maintenance difficulties simultaneously improve detection essence
Degree.Pumping photo-detector 6 and Stokes photo-detector 7 can use APD photodiodes, the pumping light intensity real-time monitored and
Stokes light intensity can be used as signal calibration foundation.
Claims (4)
1. a kind of single light source CARS gas-detecting devices, including pump laser and the Raman pond for being filled with pure object gas, its
It is characterized in：Pump laser (1) is located at one end of light path, and condenser lens has been sequentially placed on the output light path of laser (1)
(2) Raman pond (3) of pure object gas, beam splitter (4), condenser lens (8), under test gas pond or pipeline, short-pass, are filled with
Filter plate (10) and detector (11), the path-splitting in beam splitter (4) side are placed with two-phase Look mirror (5), pumping laser detection
Device (6), is placed with Stokes photo-detector (7) on the path-splitting of dichroscope (5) side.
2. single light source CARS gas-detecting devices according to claim 1, it is characterized in that：Pump laser (1) is located at light
The one end on road, is focused in the output light line focus lens (2) of pump laser (1), is filled from the light window injection that enters of Raman pond (3)
It is filled with the Raman pond of pure object gas (3), the light exported by Raman pond (3) light-emitting window is saturating through beam splitter (4) transmission, focusing
Mirror (8) is focused on, and enters light window injection under test gas pond under test gas pond side, under test gas pond or pipeline opposite side
Light-emitting window output light be irradiated to through short-pass filter plate (10) on detector (11)；The light warp reflected by beam splitter (4)
It is irradiated to after two-phase Look mirror (5) transmission on pumping laser detector (6), the illumination of two-phase Look mirror (5) reflection is mapped to Stokes
Photo-detector (7).
3. a kind of method that use claim 1 described device carries out CARS gas detections, it is characterized in that：
The pure object gas of filling in Raman pond (3), is detected under test gas pond or pipeline filling under test gas；Detector
(11) the CARS signal light intensities of collection are I, and two-phase Look mirror (5) is high to pumping laser thoroughly, and high to stokes light anti-, pumping swashs
The pumping light intensity of photo-detector (6) collection is Ip, and the stokes light light intensity of Stokes photo-detector (7) collection is Is；
The CARS signal light intensities of detector (11) collection are I, and C is mole of the unit volume of object gas under test gas pond
Amount, I and Ip, Is, the relation between C is I=K × Ip 2×Is×C2；
Wherein K is apparatus function, determines and obtains when being and the object gas of standard unit's Molar amount is filled under test gas pond
.
4. according to the method that CARS gas detections are carried out described in claim 3, it is characterized in that：
The gas filled in Raman pond must be consistent with the object gas to be checked under test gas, but pressure is larger in Raman pond,
Between 1.5MPa-10MPa, the Raman active difference according under test gas is varied from, the stoke produced in the Raman pond
This optical wavelength can accurately meet CARS detection requirements.
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| CN106679810A (en) * | 2015-11-05 | 2017-05-17 | 中国科学院大连化学物理研究所 | Forward coherent enhanced anti-Stokes Raman spectrometer |
| CN106932318B (en) * | 2015-12-30 | 2021-01-15 | 中国科学院电子学研究所 | Diagnostic device and method for semiconductor pumping alkali metal vapor laser |
| CN106338501A (en) * | 2016-03-23 | 2017-01-18 | 北京杏林睿光科技有限公司 | Novel Raman probe with light source |
| CN108088832B (en) * | 2016-11-22 | 2020-09-04 | 中国科学院大连化学物理研究所 | Single-light-source CARS (coherent anti-Raman scattering) spectrum device and method for detecting Raman active medium |
| CN109031658B (en) * | 2017-06-12 | 2020-10-02 | 中国科学院大连化学物理研究所 | Thin laser transmission detection window |
| CN109839368A (en) * | 2017-11-27 | 2019-06-04 | 中国科学院大连化学物理研究所 | A kind of temperature control type single light source CARS spectral device and the method for detecting Raman active medium |
| CN108613967B (en) * | 2018-08-09 | 2020-12-08 | 江苏师范大学 | Raman spectrum testing system |
| CN110231332B (en) * | 2019-07-03 | 2022-01-11 | 榆林学院 | Coherent anti-Stokes Raman scattering spectrum device and method simplified by utilizing super-steep filter plate |
| CN111413317B (en) * | 2020-04-29 | 2021-09-21 | 中国科学院长春光学精密机械与物理研究所 | Stimulated Raman gas sensing system based on annular optical fiber resonant cavity |
| CN113340868B (en) * | 2021-05-11 | 2023-02-14 | 中国科学院上海光学精密机械研究所 | Detection device and detection method for measuring concentration of pollutants in air by single-beam femtosecond laser |
| CN116337273B (en) * | 2023-05-29 | 2023-07-28 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | CARS spectrum multi-point temperature measuring device based on double micro-lens arrays |
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