CN111693504A - Scattering signal enhancement type gas Raman detection device - Google Patents
Scattering signal enhancement type gas Raman detection device Download PDFInfo
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- CN111693504A CN111693504A CN201910191453.XA CN201910191453A CN111693504A CN 111693504 A CN111693504 A CN 111693504A CN 201910191453 A CN201910191453 A CN 201910191453A CN 111693504 A CN111693504 A CN 111693504A
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- G—PHYSICS
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- 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
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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
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Abstract
The invention relates to a scattering signal enhancement type gas Raman detection device which comprises a laser generation cavity left reflector, a laser generation cavity right reflector, a high-voltage helium neon cavity, a Raman cavity left reflector, a Raman cavity right reflector, a gas chamber, a gain element and a photoelectric signal detector which are sequentially arranged from left to right, wherein the centers of the two reflectors are on the same straight line. The laser generation cavity comprises a left reflector, a right reflector and a high-voltage helium-neon cavity, and is responsible for generating exciting light; the Raman cavity comprises a left reflector, a right reflector and a gain element, wherein the gain element is responsible for enhancing optical signals scattered by gas; the gas chamber is used for storing gas to be detected, the upper side of the left part is connected with gas inlet, and the lower side of the right part is connected with gas outlet; the photoelectric signal detector is responsible for detecting the intensity of the optical signal. The scattering signal enhanced gas Raman detection device successfully realizes the detection of extremely low concentration of substances, and the double-cavity mode has the characteristics of high signal-to-noise ratio, high measurement sensitivity, strong reliability, low requirement on a detector, easiness in realization and the like.
Description
Technical Field
The invention relates to a gas concentration detection method, in particular to a scattering signal enhanced gas Raman detection device, and belongs to the technical field of gas detection.
Background
Along with social progress, the importance of gas concentration detection in production and life is more obvious, and in various industries such as petroleum, chemical engineering, metallurgy, electric power, medicine and the like, the gas concentration detection is more important because the gas concentration detection has higher requirements on metering and controlling various gas media, and has important significance on ensuring product quality, saving energy, reducing raw material consumption and enhancing economic accounting.
In the prior art, the device is named as a solid active cavity enhanced laser Raman gas detection device with the application number of CN201420115349.5, and has some advantages but certain disadvantages. The advantage of this patent does: 1) the laser generated by the high-voltage cavity laser has the characteristics of stable beam mode, tunable multiple beam modes in the near-field propagation process, and can carry more beam information under the condition of ensuring stable wavelength. 2) Compared with the prior art, the device adopting the horizontal double-cavity structure has the advantages of simpler structure and smaller Raman signal loss, and greatly increases the signal-to-noise ratio of the spectral signal. 3) In the signal enhancement process, the principle of a reflector is often adopted for enhancement in the prior art, and compared with the prior art, the enhancement structure designed by the laser gain principle adopted by the invention can reduce the interference caused by stray light in the light field signal propagation process, and has the characteristic of directly enhancing the signal of a sample to be detected.
Disclosure of Invention
The invention aims to provide a scattering signal enhanced gas Raman detection device aiming at the defects of the technology, so that the extremely low concentration detection of substances is successfully realized, and the double-cavity mode has the characteristics of high signal-to-noise ratio, high measurement sensitivity, strong reliability, low requirement on a detector, easiness in realization and the like.
The technical scheme of the invention is as follows: a scattering signal enhancement type gas Raman detection device comprises a laser generation cavity left reflector, a high-voltage helium neon cavity, a laser generation cavity right reflector, a Raman cavity left reflector, a gas chamber, a gain element, a Raman cavity right reflector and a photoelectric signal detector, wherein exciting light generated by the high-voltage helium neon cavity in a laser generator is enhanced through the left reflector and the right reflector to reach the laser emitting condition, and laser is generated; the exciting light is emitted to reach the Raman cavity, Raman scattering is generated between the gas chamber and the measured gas, the wavelength is shifted, a scattering signal is enhanced under the action of the gain element and the reflector, an optical signal is amplified, the light intensity is measured by the photoelectric signal detector, the optical signal is converted into an electric signal, the gas concentration is obtained, and the aim of enhancing the weak Raman signal is fulfilled.
The laser generation cavity comprises a laser generation cavity left reflecting mirror (1), a laser generation cavity right reflecting mirror (3), a Raman cavity left reflecting mirror (4) and a Raman cavity right reflecting mirror (7), which are concave mirrors with plated films.
The high-pressure helium neon cavity (2) generates laser with the wavelength of 632.8 nm.
The gas chamber (5) is one of high-pressure cavities made of glass.
The gain element (6) is a substance corresponding to the Raman scattering light frequency corresponding to the gas to be measured.
The photoelectric signal detector (8) is one of a semiconductor photoelectric detector and a thermoelectric detector.
The invention discloses the following technical effects: the invention relates to a scattering signal enhancement type gas Raman detection device which comprises a laser generation cavity left reflector, a high-voltage helium neon cavity, a laser generation cavity right reflector, a Raman cavity left reflector, a gas chamber, a gain element, a Raman cavity right reflector and a photoelectric signal detector which are sequentially arranged from left to right, wherein the centers of the Raman cavity right reflector and the Raman cavity left reflector are on the same straight line. The upper side of the left part of the gas chamber is connected with a gas inlet, the lower side of the right part of the gas chamber is connected with a gas outlet, and finally the gas concentration is detected by a photoelectric signal detector. The scattering signal enhanced gas Raman detection device successfully realizes the detection of extremely low concentration of substances, and the double-cavity mode has the characteristics of high signal-to-noise ratio, high measurement sensitivity, strong reliability, low requirement on a detector, easiness in realization and the like.
Drawings
Fig. 1 is a diagram of a scattering signal enhanced gas raman detection apparatus according to the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1, a scattering signal enhancement type gas raman detection device comprises a laser generation cavity left reflector 1, a high-voltage helium neon cavity 2, a laser generation cavity right reflector 3, a raman cavity left reflector 4, a gas chamber 5, a gain element 6, a raman cavity right reflector 7 and a photoelectric signal detector 8.
The exciting light generated by the high-voltage helium-neon cavity in the laser generator is enhanced by the left and right reflectors to reach the emitting condition of the laser to generate laser; the exciting light is emitted to reach the Raman cavity, Raman scattering is generated between the gas chamber and the measured gas, the wavelength is shifted, a scattering signal is enhanced under the action of the gain element and the reflector, an optical signal is amplified, the light intensity is measured by the photoelectric signal detector, the optical signal is converted into an electric signal, the gas concentration is obtained, and the aim of enhancing the weak Raman signal is fulfilled.
The invention adopts double-cavity mode gas Raman detection, and successfully realizes the detection of extremely low concentration of substances. The laser generated by the high-voltage cavity laser has the characteristics of stable beam mode, tunable multiple beam modes in the near-field propagation process, and can carry more beam information under the condition of ensuring stable wavelength. Compared with the prior art, the device adopting the horizontal double-cavity structure has the advantages of simpler structure and smaller Raman signal loss, and greatly increases the signal-to-noise ratio of the spectral signal. In the signal enhancement process, the principle of a reflector is often adopted in the prior art for enhancement, and compared with the prior art, the enhancement structure designed by the laser gain principle adopted by the invention can reduce the interference caused by stray light in the light field signal propagation process, and has the special characteristic of directly enhancing the signal of a sample to be detected
The above-mentioned embodiments are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only the most preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions, equivalents, etc. made within the scope of the principles of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a gaseous raman detection device of scattered signal enhancement mode, takes place chamber left reflector (1), high pressure helium neon chamber (2), laser and takes place chamber right reflector (3), raman chamber left reflector (4), gas chamber (5), gain element (6), raman chamber right reflector (7), photoelectric signal detector (8) including laser, its characterized in that: the laser generation cavity left reflector (1), the high-voltage helium neon cavity (2), the laser generation cavity right reflector (3), the Raman cavity left reflector (4), the gas chamber (5), the gain element (6), the Raman cavity right reflector (7) and the photoelectric signal detector (8) are sequentially arranged from left to right and placed, the centers of the laser generation cavity left reflector and the Raman cavity right reflector are on the same straight line, gas to be detected is connected with the gas through the left upper side (501), and the gas through the gas chamber is connected with the right lower side (502). Firstly, the exciting light generated by a high-voltage helium-neon cavity in a laser generator is enhanced by a left reflector and a right reflector to reach the emergent condition of a laser to generate laser; the exciting light is emitted to reach the Raman cavity, Raman scattering is generated between the gas chamber and the measured gas, the wavelength is shifted, a scattering signal is enhanced under the action of the gain element and the reflector, an optical signal is amplified, the light intensity is measured by the photoelectric signal detector, the optical signal is converted into an electric signal, the gas concentration is obtained, and the aim of enhancing the weak Raman signal is fulfilled.
2. A scattering signal enhanced gas raman detection device according to claim 1, wherein: the laser generation cavity comprises a laser generation cavity left reflecting mirror (1), a laser generation cavity right reflecting mirror (3), a Raman cavity left reflecting mirror (4) and a Raman cavity right reflecting mirror (7), which are concave mirrors with plated films.
3. A scattering signal enhanced gas raman detection device according to claim 1, wherein: the high-pressure helium neon cavity (2) generates laser with the wavelength of 632.8 nm.
4. A scattering signal enhanced gas raman detection device according to claim 1, wherein: the gas chamber (5) is one of high-pressure cavities made of glass.
5. A scattering signal enhanced gas raman detection device according to claim 1, wherein: the gain element (6) is a substance corresponding to the Raman scattering light frequency corresponding to the gas to be measured.
6. A scattering signal enhanced gas raman detection device according to claim 1, wherein: the photoelectric signal detector (8) is one of a semiconductor photoelectric detector and a thermoelectric detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910191453.XA CN111693504A (en) | 2019-03-14 | 2019-03-14 | Scattering signal enhancement type gas Raman detection device |
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| CN201910191453.XA CN111693504A (en) | 2019-03-14 | 2019-03-14 | Scattering signal enhancement type gas Raman detection device |
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| CN111693504A true CN111693504A (en) | 2020-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264642A (en) * | 2021-11-23 | 2022-04-01 | 中国船舶重工集团公司第七一八研究所 | Gas Raman signal enhancement device and method in multiple reflection and pressurization mode |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264642A (en) * | 2021-11-23 | 2022-04-01 | 中国船舶重工集团公司第七一八研究所 | Gas Raman signal enhancement device and method in multiple reflection and pressurization mode |
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Application publication date: 20200922 |