CN109655446B - Triangular resonant cavity/integrating sphere combined enhancement cavity for improving gas Raman intensity - Google Patents
Triangular resonant cavity/integrating sphere combined enhancement cavity for improving gas Raman intensity Download PDFInfo
- Publication number
- CN109655446B CN109655446B CN201910059829.1A CN201910059829A CN109655446B CN 109655446 B CN109655446 B CN 109655446B CN 201910059829 A CN201910059829 A CN 201910059829A CN 109655446 B CN109655446 B CN 109655446B
- Authority
- CN
- China
- Prior art keywords
- cavity
- integrating sphere
- gold
- triangular
- mirrors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001069 Raman spectroscopy Methods 0.000 title abstract description 5
- 239000007789 gas Substances 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000002310 reflectometry Methods 0.000 claims abstract description 20
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000010931 gold Substances 0.000 claims abstract description 5
- 229910052737 gold Inorganic materials 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 239000010453 quartz Substances 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000004458 analytical method Methods 0.000 description 4
- 238000001237 Raman spectrum Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000005350 fused silica glass Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004949 mass spectrometry Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004867 photoacoustic spectroscopy Methods 0.000 description 1
- 238000001834 photoacoustic spectrum Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- 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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
- G01N21/658—Raman scattering enhancement Raman, e.g. surface plasmons
Landscapes
- Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
本发明涉及一种提高气体拉曼强度的三角型谐振腔/积分球联合增强腔，包括三块具有高反射率的腔镜(M1、M2、M3)、镀金积分球、具有高反射率的逆向反射镜(M4)和密封室，三块具有高反射率的腔镜(M1、M2、M3)镶嵌在镀金积分球上对应的三个孔洞处，具有高反射率的逆向反射镜(M4)安装在镀金积分球外且在腔镜(M3)后部的位置，而且逆向反射镜(M4)安装在密封室内。本发明针对目前换流变状态特征气体检测装置检测准确度低，无法同时测量并区分多种特征气体的问题，突破了拉曼光谱气体最小检测浓度达不到要求的技术瓶颈，大大提升了换流变状态特征气体检测的准确度与灵敏度。
The invention relates to a triangular resonant cavity/integrating sphere combined enhanced cavity for improving the Raman intensity of gas, comprising three cavity mirrors (M 1 , M 2 , M 3 ) with high reflectivity, a gold-plated integrating sphere with high reflectivity A retroreflector (M 4 ) and a sealed chamber with high reflectivity, three cavity mirrors with high reflectivity (M 1 , M 2 , M 3 ) are embedded in the corresponding three holes on the gold-coated integrating sphere, with high reflectivity A retro-reflector (M 4 ) is mounted outside the gold-coated integrating sphere and at a position behind the cavity mirror (M 3 ), and the retro-reflector (M 4 ) is mounted in the sealed chamber. The invention solves the problem of low detection accuracy of the current commutation change state characteristic gas detection device and cannot measure and distinguish multiple characteristic gases at the same time, breaks through the technical bottleneck that the minimum detection concentration of Raman spectroscopy gas cannot meet the requirements, and greatly improves the conversion efficiency. Accuracy and sensitivity of rheological state characteristic gas detection.
Description
Technical Field
The invention belongs to the technical field of detection devices for state characteristic gases of power equipment, and particularly relates to a triangular resonant cavity/integrating sphere combined enhancement cavity for improving Raman intensity of gases.
Background
When the converter transformer is used as a junction device in a direct current transmission system, once a fault occurs, not only can expensive electrical equipment be damaged, but also the power grid can be paralyzed, and the loss which is difficult to estimate is caused to the daily life of people and the national economy. The operation of the converter transformer oilpaper insulation system can be decomposed under the action of various factors such as electricity, heat and the like to generate various gases (H) reflecting fault properties and insulation performance2、CH4、C2H2、C2H4、C2H6、CO、CO2、O2Etc.) and dissolved in the insulating oil. The accurate detection of 8 kinds of trace fault characteristic gas in oil has very important significance for ensuring the safe and reliable operation of the large-scale converter transformer.
The existing fault characteristic gas online monitoring device mainly comprises an oil-gas separator and a fault characteristic gas sensing detector separated from oil. Analysis shows that: the problems of gas cross interference, easy aging, poor stability and the like of the internal sensing detector are main reasons of large analysis error, more misjudgment and missed judgment of the existing fault characteristic gas online monitoring device. The existing fault characteristic gas sensing analysis method mainly comprises the following steps: qi (Qi)Phase chromatography, mass spectrometry, semiconductor (carbon nanotube) gas sensor, solid state microbridge detector, infrared absorption spectrum and photoacoustic spectrometry. The gas chromatography is the most common detection method for trace fault characteristic gas analysis, and can realize accurate measurement. However, the chromatographic column is easy to age and is not favorable for long-term detection. The mass spectrometry has the characteristics of high efficiency and accurate detection, but the effective detection of the mixed gas can be realized only by combining a chromatographic column; the sensitivity of a semiconductor (carbon nano tube) gas sensor and a solid-state microbridge detector is high, but the problem of mixed gas cross sensitivity exists, the mixed gas is easy to age, the stability is low, and the detection accuracy is to be improved; the infrared absorption spectrum and the photoacoustic spectrum analysis method have the characteristics of no damage and no consumption of sample gas, have high detection sensitivity, are gas optical detection methods rapidly developed in recent years, but each gas to be detected needs a laser with a specific wavelength to excite the absorption effect of the gas, and the method is difficult to detect the low-concentration H2And O2Equivalent nuclear diatomic gases.
Disclosure of Invention
In order to solve the technical problems of gas cross interference, easy aging, poor stability and the like of the current converter transformer state characteristic gas detection device, the invention provides a light feedback frequency locking triangular resonant cavity/gold-plated integrating sphere combined enhanced Raman spectrum detection method, designs a trace gas light feedback frequency locking triangular resonant cavity/integrating cavity combined enhanced Raman spectrum detection device, and realizes trace detection of the converter transformer state characteristic gas Raman spectrum.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the triangular resonant cavity/gold-plated integrating sphere combined cavity comprises three cavity mirrors M with high reflectivity1、M2、M3Gold-plated integrating sphere, retroreflective mirror M having high reflectivity4And a sealed chamber. Three cavity mirrors M with high reflectivity1、M2、M3A retroreflector M embedded in three corresponding holes on the gold-plated integrating sphere and having high reflectivity4Mounted outside the gold-plated integrating sphere at M3Position of the rear part, and M4Is arranged in a sealed chamberAnd (4) the following steps. Three cavity mirrors M1、M2、M3The laser beams are arranged in a regular triangle from the space, and the laser beams incident to the triangular resonant cavity/the gold-plated integrating sphere combined cavity are arranged according to M1→M2→M3→ M1Multiple reflections are performed. Three cavity mirrors M1、M2、M3The geometric centers of the two adjacent cavity mirrors are positioned on the same plane, and the included angle formed by the connecting line between the geometric centers of the two adjacent cavity mirrors and the tangent line at the geometric center of the cavity mirror is 60 degrees. Incident laser line and cavity mirror M1The included angle between the normal lines at the geometric center of the cavity mirror M is 30 degrees, and the straight line where the incident laser is positioned and the cavity mirror M2Is also 30 deg. between normals at the geometric centre. Such a triangular resonator may ensure by geometry that reflections of the incident laser beam directly from the cavity input mirror do not return to the laser.
The invention is at chamber mirror M3A retro-reflector M is arranged at the rear part4Will be composed of a cavity mirror M3And the laser escaping from the triangular resonant cavity/gold-plated integrating sphere combined cavity is reflected back to the triangular resonant cavity/gold-plated integrating sphere combined cavity according to the original optical path. By a retro-reflector M4The part of the reflected laser light reflected back to the triangular resonant cavity/gold-plated integrating sphere combined cavity is according to M3→ M2→M1→M3The light path of the laser is reflected for multiple times, and two laser beams are totally arranged in the triangular resonant cavity/the gold-plated integrating sphere combined cavity, wherein the original incident laser beam and the reflected laser beam are reflected by a reverse reflector M4The reflected laser light reflected back into the joint cavity is enhanced separately.
To prevent the incident laser beam from being reflected by the retroreflector M4The reflected laser reflected back to the combined cavity generates destructive interference in the triangular resonant cavity/gold-plated integrating sphere combined cavity to reduce the laser intensity in the combined cavity, and the PZT piezoelectric sensor is arranged on the reverse reflector M4At the base, the retroreflector M is adjusted by adjusting the position of the PZT piezoelectric sensor4Thereby controlling the position of the retroreflector M4The phase of the reflected laser light reflected back into the combined cavity is adjusted so that the incident laser light and the reflected laser light are reflected by the retroreflector M4ReflectionThe reflected laser returning to the combined cavity always generates constructive interference in the triangular resonant cavity/gold-plated integrating sphere combined cavity, so that the laser intensity in the combined cavity is increased.
Once light that meets the resonance conditions of the triangular resonator enters the cavity, it propagates as a traveling wave around the cavity. Resonant frequency (omega) of triangular resonant cavityn) Corresponding to the length LR2 pi phase change after a single round trip. The angular frequency of resonance in the cavity (ω ═ 2 π c/λ for wavelength λ) is given by the following equation
Where n is any integer and c is the speed of light in the intracavity medium.
In order to prevent the influence of dust in the external environment, the retroreflector M4And the sealing chamber is positioned in the sealing chamber, the sealing chamber is filled with nitrogen, the pressure in the sealing chamber is one atmospheric pressure, and one side surface of the sealing chamber is provided with a wedge-shaped fused quartz window.
The three cavity mirrors are plano-concave lenses, the reflectivity is greater than 0.9999, and the curvature radius is 100 cm. The length of a straight line L between the geometric centers of two adjacent cavity mirrors is 18.3 cm. Retro-reflector M4Is placed in the cavity mirror M3At a distance of 3 cm.
In the invention, the top of the gold-plated integrating sphere is also provided with a circular hole with the radius of 0.6cm as a gas inlet and outlet for detection.
Drawings
The technical scheme is further explained by combining the attached drawings.
FIG. 1 is a schematic structural diagram of a triangular resonant cavity/integrating sphere combined enhanced cavity for gas detection in converter flow.
Fig. 2 is an external view and a cross-sectional view of a gold-plated integrating sphere.
Detailed Description
Example 1
As shown in FIG. 1, a triangular cavity/gold-plated integrating sphere combination in this embodimentThe cavity comprises three cavity mirrors M1, M2 and M3 with high reflectivity, a gold-plated integrating sphere, a retroreflector M4 with high reflectivity and a sealed chamber. Three round holes with the radius of 3.5cm are formed in the gold-plated integrating sphere, and a round hole with the radius of 0.6cm is formed in the top end of the gold-plated integrating sphere. Three cavity mirrors M with high reflectivity1、M2、M3A retroreflector M embedded in three corresponding holes on the gold-plated integrating sphere and having high reflectivity4Mounted outside the gold-plated integrating sphere at M3Position of the rear part, and M4Is installed in the sealed chamber. Three cavity mirrors M1、M2、M3The laser beams are arranged in a regular triangle from the space, and the laser beams incident to the triangular resonant cavity/the gold-plated integrating sphere combined cavity are arranged according to M1→M2→M3→M1Multiple reflections are performed. Three cavity mirrors M1、M2、M3The geometric centers of the two adjacent cavity mirrors are positioned on the same plane, and the included angle formed by the connecting line between the geometric centers of the two adjacent cavity mirrors and the tangent line at the geometric center of the cavity mirror is 60 degrees. Incident laser line and cavity mirror M1The included angle between the normal lines at the geometric center of the cavity mirror M is 30 degrees, and the straight line where the incident laser is positioned and the cavity mirror M2Is also 30 deg. between normals at the geometric centre.
In the embodiment, the three cavity mirrors are all plano-concave lenses, the reflectivity is greater than 0.9999, and the curvature radius is 100 cm. The length of a straight line L between the geometric centers of two adjacent cavity mirrors is 18.3 cm. The coating material on the inner wall of the gold-plated integrating sphere is gold, and the radius of the integrating sphere is 10.5 cm. The reverse reflector M4And the endoscope M3The emergent laser is vertical and is arranged in a distance cavity mirror M33cm position. The sealing chamber is filled with nitrogen, the pressure in the sealing chamber is one atmospheric pressure, and one side surface of the sealing chamber is provided with a wedge-shaped fused quartz window.
As shown in fig. 2, in this embodiment, a circular hole with a radius of 3.5cm is formed in each of the three cavity mirrors, and a circular hole with a radius of 0.6cm is formed at the top of the gold-plated integrating sphere for gas to enter and exit.
In order to measure the enhancement effect of the combined enhancement cavity on laser, a power sampling plate and a laser power meter are arranged in front of the combined enhancement cavity, and a laser power meter is arranged behind the combined enhancement cavity. When laser is emitted into the combined enhanced cavity by a laser, the laser power measured by a laser power meter in front of the cavity is 2.45mW, and the reflectivity of the power sampling plate is 10 percent, so that the laser power emitted into the combined enhanced cavity is 22.05 mW. When the laser power measured after the cavity was 63 μ W, the laser power in the cavity was enhanced by 1890mW, and the enhancement factor of the laser power was calculated to be about 85.7 times.
While the best mode for carrying out the invention has been described in detail and illustrated in the accompanying drawings, it is to be understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the scope of the invention should be determined by the appended claims and any changes or modifications which fall within the true spirit and scope of the invention should be construed as broadly described herein.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910059829.1A CN109655446B (en) | 2019-01-22 | 2019-01-22 | Triangular resonant cavity/integrating sphere combined enhancement cavity for improving gas Raman intensity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910059829.1A CN109655446B (en) | 2019-01-22 | 2019-01-22 | Triangular resonant cavity/integrating sphere combined enhancement cavity for improving gas Raman intensity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109655446A CN109655446A (en) | 2019-04-19 |
| CN109655446B true CN109655446B (en) | 2021-03-30 |
Family
ID=66120773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910059829.1A Active CN109655446B (en) | 2019-01-22 | 2019-01-22 | Triangular resonant cavity/integrating sphere combined enhancement cavity for improving gas Raman intensity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109655446B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110596005A (en) * | 2019-09-25 | 2019-12-20 | 安徽理工大学 | A Novel Optical Multi-pass Absorption Cell with Annular Plano-Concave Mirror |
| CN113161862B (en) * | 2021-04-23 | 2022-10-04 | 浙江法拉第激光科技有限公司 | Optical resonant cavity based on integrating sphere and implementation method thereof |
| CN113295669B (en) * | 2021-05-14 | 2023-10-24 | 重庆大学 | Folding type multi-reflecting cavity for enhancing gas Raman signal |
| US12178397B2 (en) * | 2022-06-07 | 2024-12-31 | Karl Storz Imaging, Inc. | Sterile calibrating cap and methods for using the same on an endoscope |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1685217A (en) * | 2002-09-30 | 2005-10-19 | 英特尔公司 | Spectroscopic analysis system and method |
| JP2008203022A (en) * | 2007-02-19 | 2008-09-04 | Riken Keiki Co Ltd | Optical interference type gas concentration measuring device |
| CN101539511A (en) * | 2009-04-24 | 2009-09-23 | 中国科学院上海光学精密机械研究所 | Device and method for measuring optical characteristic parameters of nanoparticle system |
| CN102346140A (en) * | 2011-06-17 | 2012-02-08 | 清华大学 | Air refractive index measurement system and measurement method thereof |
| CN105548048A (en) * | 2015-12-29 | 2016-05-04 | 山东罗纳德分析仪器有限公司 | Designing method and device of spectrum sampling gas chamber of multi-optical-path single gas chamber |
| CN205212168U (en) * | 2015-12-01 | 2016-05-04 | 苏州谱道光电科技有限公司 | Speculum for optical resonantor and optical resonantor and spectral measurement appearance thereof |
| CN105784593A (en) * | 2015-07-03 | 2016-07-20 | 清华大学 | Quadruplet objective lens Chernin type multi-optical-distance gas absorption cavity |
| CN107104262A (en) * | 2017-04-10 | 2017-08-29 | 南京航空航天大学 | A kind of method and cavity resonator structure for improving microwave cavity magnetic distribution uniformity |
| WO2018078051A1 (en) * | 2016-10-28 | 2018-05-03 | Coherent Lasersystems Gmbh & Co. Kg | Monitoring method and apparatus for excimer-laser annealing process |
| CN108535192A (en) * | 2018-06-15 | 2018-09-14 | 上海理工大学 | LR laser raman gas-detecting device based on Multi-path proportional detection |
-
2019
- 2019-01-22 CN CN201910059829.1A patent/CN109655446B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1685217A (en) * | 2002-09-30 | 2005-10-19 | 英特尔公司 | Spectroscopic analysis system and method |
| JP2008203022A (en) * | 2007-02-19 | 2008-09-04 | Riken Keiki Co Ltd | Optical interference type gas concentration measuring device |
| CN101539511A (en) * | 2009-04-24 | 2009-09-23 | 中国科学院上海光学精密机械研究所 | Device and method for measuring optical characteristic parameters of nanoparticle system |
| CN102346140A (en) * | 2011-06-17 | 2012-02-08 | 清华大学 | Air refractive index measurement system and measurement method thereof |
| CN105784593A (en) * | 2015-07-03 | 2016-07-20 | 清华大学 | Quadruplet objective lens Chernin type multi-optical-distance gas absorption cavity |
| CN205212168U (en) * | 2015-12-01 | 2016-05-04 | 苏州谱道光电科技有限公司 | Speculum for optical resonantor and optical resonantor and spectral measurement appearance thereof |
| CN105548048A (en) * | 2015-12-29 | 2016-05-04 | 山东罗纳德分析仪器有限公司 | Designing method and device of spectrum sampling gas chamber of multi-optical-path single gas chamber |
| WO2018078051A1 (en) * | 2016-10-28 | 2018-05-03 | Coherent Lasersystems Gmbh & Co. Kg | Monitoring method and apparatus for excimer-laser annealing process |
| CN107104262A (en) * | 2017-04-10 | 2017-08-29 | 南京航空航天大学 | A kind of method and cavity resonator structure for improving microwave cavity magnetic distribution uniformity |
| CN108535192A (en) * | 2018-06-15 | 2018-09-14 | 上海理工大学 | LR laser raman gas-detecting device based on Multi-path proportional detection |
Non-Patent Citations (2)
| Title |
|---|
| Optical parametric sources for gas sensing applications;Antoine Godard et al;《Proc. of SPIE》;20171231;第10111卷;全文 * |
| 注入锁定腔增强拉曼光谱微量气体检测技术;王品一等;《光学精密工程》;20180831;第26卷(第8期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109655446A (en) | 2019-04-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109655446B (en) | Triangular resonant cavity/integrating sphere combined enhancement cavity for improving gas Raman intensity | |
| Liu et al. | A highly sensitive LITES sensor based on a multi-pass cell with dense spot pattern and a novel quartz tuning fork with low frequency | |
| Wang et al. | Highly sensitive laser spectroscopy sensing based on a novel four-prong quartz tuning fork | |
| Sun et al. | Highly sensitive and real-simultaneous CH4/C2H2 dual-gas LITES sensor based on Lissajous pattern multi-pass cell | |
| Zhao et al. | Ultra-high sensitive photoacoustic gas detector based on differential multi-pass cell | |
| CN104237135B (en) | CO gas detecting systems and method based on quartz tuning fork strengthened optoacoustic spectroscopy | |
| Ma et al. | Design of multipass cell with dense spot patterns and its performance in a light-induced thermoelastic spectroscopy-based methane sensor | |
| Guo et al. | High-sensitivity silicon cantilever-enhanced photoacoustic spectroscopy analyzer with low gas consumption | |
| CN102590112B (en) | Surface microstructure silicon cantilever enhancement type optical-thermal spectrum trace gas detection method and device | |
| CN113109268B (en) | Photoacoustic spectroscopy enhancement apparatus and method for gas detection using the same | |
| Zhao et al. | Ultra-high sensitive multipass absorption enhanced fiber-optic photoacoustic gas analyzer | |
| Qi et al. | Rapid photoacoustic exhaust gas analyzer for simultaneous measurement of nitrogen dioxide and sulfur dioxide | |
| CN214472779U (en) | For detecting SF6Enhanced Raman spectrum detection system for decomposed gas | |
| CN111896492A (en) | A long optical path gas detection system and method based on quantum cascade laser | |
| CN108562546A (en) | A kind of detecting instrument and method of the miniaturization enhanced Laser Photoacoustic Spectroscopy of multiple reflections formula photoacoustic cell | |
| CN103837520A (en) | Optic travelling wave cavity enhanced laser raman gas concentration detection device | |
| Wu et al. | Single fiber-type double cavity enhanced photoacoustic spectroscopy sensor for trace methane sensing | |
| CN109870414A (en) | A scattering-enhanced gas sensing probe | |
| CN105572099B (en) | LR laser raman gas-detecting device based on homocentric hysteroscope | |
| Zhao et al. | All-optical photoacoustic detection of SF6 decomposition component SO2 based on fiber-coupled UV-LED | |
| Li et al. | Cantilever-enhanced fiber-optic photoacoustic spectrophone for low-pressure gas detection | |
| Gong et al. | Noncontact fiber-optic cantilever-enhanced photoacoustic spectroscopy | |
| CN108593597A (en) | Natural gas leaking early warning monitoring device and method based on optical fiber FP lumen type probe | |
| CN112666083A (en) | SF based on Raman spectrum6Decomposition gas detection enhancement system | |
| Wu et al. | Multiple optical path length reflections enhancement based on balloon-type photoacoustic cell for trace gas sensing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |