CN111896475A - Light path range-extending type photoacoustic cell for photoacoustic spectrum trace gas detection - Google Patents
Light path range-extending type photoacoustic cell for photoacoustic spectrum trace gas detection Download PDFInfo
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- CN111896475A CN111896475A CN202010742006.1A CN202010742006A CN111896475A CN 111896475 A CN111896475 A CN 111896475A CN 202010742006 A CN202010742006 A CN 202010742006A CN 111896475 A CN111896475 A CN 111896475A
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- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 238000001834 photoacoustic spectrum Methods 0.000 title description 5
- 230000003287 optical effect Effects 0.000 claims abstract description 32
- 238000004867 photoacoustic spectroscopy Methods 0.000 claims abstract description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 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
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/031—Multipass arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/222—Constructional or flow details for analysing fluids
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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
- 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
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Abstract
An optical path extended range photoacoustic cell for photoacoustic spectroscopy trace gas detection comprises a frame, a concave reflector, a plane reflector and a microphone; a first optical window, a first buffer cavity, a cylindrical resonant cavity, a second buffer cavity and a second optical window are sequentially arranged in the frame from left to right; an air inlet is arranged on the frame at the top of the first buffer cavity; an air outlet is arranged on the frame at the top of the second buffer cavity; the concave reflector is arranged in the first optical window, the reflecting concave surface of the concave reflector faces the inner side of the frame, and a laser incident port is formed in the body of the concave reflector; the plane reflector is arranged in the second optical window, and the reflecting plane of the plane reflector faces the inner side of the frame; a microphone mounting groove is formed in the frame at the top of the middle of the cylindrical resonant cavity, and the microphone is located in the microphone mounting groove; the reflecting plane of the plane reflecting mirror is provided with at least one auxiliary reflecting concave surface, the radius of the plane reflecting mirror is R, the radius of the auxiliary reflecting concave surface is R, and R is (4.5-5) R.
Description
Technical Field
The invention belongs to the technical field of photoacoustic spectroscopy trace gas detection, and particularly relates to an optical path extended range photoacoustic cell for photoacoustic spectroscopy trace gas detection.
Background
The photoacoustic spectroscopy trace gas detection technology is a high-sensitivity gas detection technology based on the characteristics of photo-thermal effect, such as high sensitivity, low background, wide dynamic range, no loss to samples in the detection process and the like, and is widely applied to the fields of coal mining, chemical industry, environmental detection, biomedical treatment and the like at present.
The photoacoustic cell is a key part of a photoacoustic spectrum trace gas detection technology, the detection sensitivity of photoacoustic signals is inseparable from the performance of the photoacoustic cell, and the traditional photoacoustic cell is increasingly difficult to further improve the detection sensitivity.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an optical path extended-range photoacoustic cell for photoacoustic spectrum trace gas detection, which can effectively increase the reflection times of laser on the basis of the basic configuration of the traditional photoacoustic cell, further increase the optical path quantity, and finally further improve the detection sensitivity by increasing the optical path quantity.
In order to achieve the purpose, the invention adopts the following technical scheme: an optical path extended range photoacoustic cell for photoacoustic spectroscopy trace gas detection comprises a frame, a concave reflector, a plane reflector and a microphone; a first optical window, a first buffer cavity, a cylindrical resonant cavity, a second buffer cavity and a second optical window are sequentially arranged in the frame from left to right; an air inlet is formed in the frame at the top of the first buffer cavity; an air outlet is formed in the frame at the top of the second buffer cavity; the concave reflector is arranged in the first optical window, the reflecting concave surface of the concave reflector faces the inner side of the frame, and a laser incident port is formed in the body of the concave reflector; the plane reflector is arranged in the second optical window, and the reflecting plane of the plane reflector faces the inner side of the frame; a microphone mounting groove is formed in the frame at the top of the middle of the cylindrical resonant cavity, and the microphone is located in the microphone mounting groove; and an auxiliary reflection concave surface is arranged on the reflection plane of the plane reflector.
The number of the auxiliary reflection concave surfaces is at least one.
The radius of the plane mirror is R, the radius of the auxiliary reflection concave surface is R, and R is (4.5-5) R.
The invention has the beneficial effects that:
the optical path extended-range photoacoustic cell for photoacoustic spectrum trace gas detection can effectively increase the reflection times of laser on the basis of the basic configuration of the traditional photoacoustic cell, further increase the optical path quantity, and finally further improve the detection sensitivity by increasing the optical path quantity.
Drawings
FIG. 1 is a schematic structural diagram of an optical path extended photoacoustic cell for photoacoustic spectroscopy trace gas detection according to the present invention;
FIG. 2 is a light spot diagram of a concave reflector in an embodiment;
FIG. 3 is a light spot diagram of a plane mirror with a concave auxiliary reflection surface in an embodiment;
in the figure, 1-frame, 2-concave reflector, 3-plane reflector, 4-microphone, 5-first optical window, 6-first buffer cavity, 7-cylindrical resonant cavity, 8-second buffer cavity, 9-second optical window, 10-air inlet, 11-air outlet, 12-laser entrance port, 13-microphone mounting groove, 14-auxiliary reflection concave surface.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, an optical path extended photoacoustic cell for photoacoustic spectroscopy trace gas detection includes a frame 1, a concave reflector 2, a plane reflector 3 and a microphone 4; a first optical window 5, a first buffer cavity 6, a cylindrical resonant cavity 7, a second buffer cavity 8 and a second optical window 9 are sequentially arranged in the frame 1 from left to right; an air inlet 10 is formed in the frame 1 at the top of the first buffer cavity 6; an air outlet 11 is formed in the frame 1 at the top of the second buffer cavity 8; the concave reflector 2 is arranged in the first optical window 5, the reflecting concave surface of the concave reflector 2 faces the inner side of the frame 1, and a laser incident port 12 is formed in the body of the concave reflector 2; the plane mirror 3 is arranged in the second optical window 9, and the reflecting plane of the plane mirror 3 faces the inner side of the frame 1; a microphone mounting groove 13 is formed in the frame 1 at the top of the middle of the cylindrical resonant cavity 7, and the microphone 4 is located in the microphone mounting groove 13; an auxiliary reflecting concave surface 14 is arranged on the reflecting plane of the plane mirror 3.
The number of the auxiliary reflecting concave surfaces 14 is at least one.
The radius of the plane mirror 3 is R, the radius of the auxiliary concave reflecting surface 14 is R, and R is (4.5-5) R.
The one-time use process of the present invention is described below with reference to the accompanying drawings:
in this embodiment, the radius of the concave reflector 2 is 7mm, the focal length of the concave reflector 2 is 250mm, the curvature radius of the concave reflector 2 is 500mm, the radius of the laser entrance port 12 is 1mm, an xyz three-dimensional coordinate system is established with the central point of the concave reflector 2 as the origin, the plane of the concave reflector 2 is located in the xy plane of the xyz three-dimensional coordinate system, and the central axis of the concave reflector 2 is taken as the z axis of the xyz three-dimensional coordinate system; the coordinate of the central point of the laser entrance port 12 in the xyz three-dimensional coordinate system is (3, 3, 0); the distance between the concave reflecting mirror 2 and the plane reflecting mirror 3 is 200mm, namely the coordinate of the central point of the plane reflecting mirror 3 in an xyz three-dimensional coordinate system is (0, 0, 200); the radius of the auxiliary reflecting concave surface 14 is 1.5mm, the focal length of the auxiliary reflecting concave surface 14 is 10mm, and the curvature radius of the auxiliary reflecting concave surface 14 is 20 mm; the number of the auxiliary reflective concave surfaces 14 is three, and the coordinates of the central points of the three auxiliary reflective concave surfaces 14 in the xyz three-dimensional coordinate system are (2, 3, 200), (-1, -3, 200), and (1, 0, 200) in sequence.
Gas to be measured is injected from the gas inlet 10, sequentially passes through the first buffer cavity 6, the cylindrical resonant cavity 7 and the second buffer cavity 8, and is finally discharged from the gas outlet 11. The laser light source is started to generate incident light, the wavelength range of the incident light is 380 nm-2100 nm, in the embodiment, the wavelength of the incident light is set to 1532.83nm, the incident light with the set wavelength is emitted to the plane reflector 3 through the laser incident port 12 with a certain slope, so that the incident light is reflected between the plane reflector 3 and the concave reflector 2 for multiple times, when the reflected light enters the range of the auxiliary reflection concave surface 14, the reflection times of the light can be improved, and finally the reflection times of the light between the plane reflector 3 and the concave reflector 2 can be improved. As shown in fig. 2, the light spot diagram of the concave reflector 2 is shown, as shown in fig. 3, the light spot diagram of the plane reflector 3 with the auxiliary reflective concave 14 is shown, and it can be seen from the two light spot diagrams that the light spot dense points are very obvious, which indicates that the light reflection times within the light spot dense point range are obviously improved.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (3)
1. An optical path range-extending photoacoustic cell for photoacoustic spectroscopy trace gas detection is characterized in that: comprises a frame, a concave reflector, a plane reflector and a microphone; a first optical window, a first buffer cavity, a cylindrical resonant cavity, a second buffer cavity and a second optical window are sequentially arranged in the frame from left to right; an air inlet is formed in the frame at the top of the first buffer cavity; an air outlet is formed in the frame at the top of the second buffer cavity; the concave reflector is arranged in the first optical window, the reflecting concave surface of the concave reflector faces the inner side of the frame, and a laser incident port is formed in the body of the concave reflector; the plane reflector is arranged in the second optical window, and the reflecting plane of the plane reflector faces the inner side of the frame; a microphone mounting groove is formed in the frame at the top of the middle of the cylindrical resonant cavity, and the microphone is located in the microphone mounting groove; and an auxiliary reflection concave surface is arranged on the reflection plane of the plane reflector.
2. An optical path extended photoacoustic cell for photoacoustic spectroscopy trace gas detection according to claim 1, wherein: the number of the auxiliary reflection concave surfaces is at least one.
3. An optical path extended photoacoustic cell for photoacoustic spectroscopy trace gas detection according to claim 1, wherein: the radius of the plane mirror is R, the radius of the auxiliary reflection concave surface is R, and R is (4.5-5) R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010742006.1A CN111896475A (en) | 2020-07-29 | 2020-07-29 | Light path range-extending type photoacoustic cell for photoacoustic spectrum trace gas detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010742006.1A CN111896475A (en) | 2020-07-29 | 2020-07-29 | Light path range-extending type photoacoustic cell for photoacoustic spectrum trace gas detection |
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| CN111896475A true CN111896475A (en) | 2020-11-06 |
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| CN202010742006.1A Pending CN111896475A (en) | 2020-07-29 | 2020-07-29 | Light path range-extending type photoacoustic cell for photoacoustic spectrum trace gas detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023168951A1 (en) * | 2022-03-07 | 2023-09-14 | 汉威科技集团股份有限公司 | Reflective optical system for long optical path gas absorption cell |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08191166A (en) * | 1995-01-12 | 1996-07-23 | Toshiba Corp | Gas laser device |
| CN101950069A (en) * | 2010-08-25 | 2011-01-19 | 中国科学院物理研究所 | Light path time-delay device |
| CN104931427A (en) * | 2015-07-02 | 2015-09-23 | 中国科学院合肥物质科学研究院 | Opto-acoustic gas detection device based on multiple reflections of optical path |
| CN205786277U (en) * | 2016-04-28 | 2016-12-07 | 中钢集团武汉安全环保研究院有限公司 | The laser gas detection platform of multiple reflections long light path high temp samples room |
| CN205826501U (en) * | 2016-06-12 | 2016-12-21 | 力合科技（湖南）股份有限公司 | For improving the device of stability of layout and being provided with the optical detection apparatus of this device |
| CN106483071A (en) * | 2016-12-30 | 2017-03-08 | 郑州光力科技股份有限公司 | A kind of gas detector and its absorption cell |
| CN108562546A (en) * | 2018-04-10 | 2018-09-21 | 大连理工大学 | A kind of detecting instrument and method of the miniaturization enhanced Laser Photoacoustic Spectroscopy of multiple reflections formula photoacoustic cell |
| CN109212733A (en) * | 2017-07-04 | 2019-01-15 | 徐州旭海光电科技有限公司 | A kind of light path folded device |
| CN209894680U (en) * | 2019-04-22 | 2020-01-03 | 安徽理工大学 | Enhanced photoacoustic cell for photoacoustic spectrum detection |
-
2020
- 2020-07-29 CN CN202010742006.1A patent/CN111896475A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08191166A (en) * | 1995-01-12 | 1996-07-23 | Toshiba Corp | Gas laser device |
| CN101950069A (en) * | 2010-08-25 | 2011-01-19 | 中国科学院物理研究所 | Light path time-delay device |
| CN104931427A (en) * | 2015-07-02 | 2015-09-23 | 中国科学院合肥物质科学研究院 | Opto-acoustic gas detection device based on multiple reflections of optical path |
| CN205786277U (en) * | 2016-04-28 | 2016-12-07 | 中钢集团武汉安全环保研究院有限公司 | The laser gas detection platform of multiple reflections long light path high temp samples room |
| CN205826501U (en) * | 2016-06-12 | 2016-12-21 | 力合科技（湖南）股份有限公司 | For improving the device of stability of layout and being provided with the optical detection apparatus of this device |
| CN106483071A (en) * | 2016-12-30 | 2017-03-08 | 郑州光力科技股份有限公司 | A kind of gas detector and its absorption cell |
| CN109212733A (en) * | 2017-07-04 | 2019-01-15 | 徐州旭海光电科技有限公司 | A kind of light path folded device |
| CN109477953A (en) * | 2017-07-04 | 2019-03-15 | 徐州旭海光电科技有限公司 | Efficient optical path folding device |
| CN108562546A (en) * | 2018-04-10 | 2018-09-21 | 大连理工大学 | A kind of detecting instrument and method of the miniaturization enhanced Laser Photoacoustic Spectroscopy of multiple reflections formula photoacoustic cell |
| CN209894680U (en) * | 2019-04-22 | 2020-01-03 | 安徽理工大学 | Enhanced photoacoustic cell for photoacoustic spectrum detection |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023168951A1 (en) * | 2022-03-07 | 2023-09-14 | 汉威科技集团股份有限公司 | Reflective optical system for long optical path gas absorption cell |
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Application publication date: 20201106 |