CN107884382B - Gas detection system based on hollow anti-resonance optical fiber - Google Patents
Gas detection system based on hollow anti-resonance optical fiber Download PDFInfo
- Publication number
- CN107884382B CN107884382B CN201710953540.5A CN201710953540A CN107884382B CN 107884382 B CN107884382 B CN 107884382B CN 201710953540 A CN201710953540 A CN 201710953540A CN 107884382 B CN107884382 B CN 107884382B
- Authority
- CN
- China
- Prior art keywords
- gas
- cavity
- optical fiber
- detected
- gas cavity
- 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
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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
- G01N2201/084—Fibres for remote transmission
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
- G01N2201/0873—Using optically integrated constructions
Landscapes
- Health & Medical Sciences (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)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention provides a gas detection system based on a hollow anti-resonance optical fiber, which comprises a laser, a first gas cavity, a hollow anti-resonance optical fiber, a second gas cavity, a spectrometer and a data processing device, wherein the laser is arranged in the first gas cavity; two ends of the hollow anti-resonance optical fiber are respectively communicated with the first gas cavity and the second gas cavity; the first gas cavity and the second gas cavity are used for injecting gas to be detected into the hollow anti-resonance optical fiber; the laser is used for inputting detection laser into the hollow anti-resonance optical fiber; the spectrometer is used for measuring Raman scattering light generated by the gas to be detected, and the data processing device is used for processing the Raman spectrum and analyzing the components and the concentration of the gas to be detected. The hollow anti-resonance optical fiber has the characteristics of low transmission loss, wide transmission bandwidth, small bending loss, high damage threshold and single-mode transmission maintenance, reduces the threshold of Raman scattering, and can detect the components and the concentration of trace gas by using pump light with lower power.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a gas detection system based on a hollow anti-resonance optical fiber.
Background
When light irradiates on a substance, scattering occurs, and the scattering of the light is divided into elastic scattering and inelastic scattering; for elastic scattering, the scattered light frequency is equal to the incident light frequency, for inelastic scattering, the scattered light frequency is not equal to the incident light frequency, for scattered light frequencies greater than the incident light frequency, referred to as anti-stokes light, and for scattered light frequencies less than the incident light frequency, referred to as stokes light, both are collectively referred to as raman scattering.
The gas composition and concentration can be detected by measuring the Raman spectrum of the gas, in the prior art system for detecting the gas by the Raman spectrum, the gas medium has no ideal carrier, only a gas cell is used for containing the gas medium, the device enables the cross section area of the action of the light and the gas to be limited by the beam waist diameter of a light spot, the action length of the light and the gas is very short, the loss of the light in the large container is very large when the light propagates, the gas amount required for injecting the gas into the container is very large, the pumping light power is very high, only the pumping light power density is large enough to enable the gas to generate the Raman scattering so as to detect the gas composition and concentration, the pumping light power required for generating the Raman scattering by the experimental device is very high, only the high concentration and a large amount of gas can be detected, and the Raman threshold of the gas is also very high, raman scattering is hardly generated.
Therefore, the systems for detecting the components and the concentration of the gas through the Raman spectrum in the prior art have the problems of large optical loss, short action length, large gas quantity and very high power to the pumping light.
Disclosure of Invention
The invention provides a gas detection system based on a hollow-core anti-resonant optical fiber, which overcomes or at least partially solves the problems of high optical loss, short action length, large gas quantity and high pumping light power of the gas detection system in the prior art.
According to one aspect of the invention, a gas detection system is provided, comprising a laser, a first gas cavity, a hollow anti-resonant optical fiber, a second gas cavity, a spectrometer and a data processing device; two ends of the hollow anti-resonance optical fiber are respectively communicated with the first gas cavity and the second gas cavity; the first gas cavity and the second gas cavity are used for injecting gas to be detected into the hollow anti-resonance optical fiber; the laser is used for inputting detection laser into the hollow anti-resonance optical fiber; the spectrometer is used for measuring Raman scattering light generated by the gas to be detected, and the data processing device is used for processing the Raman spectrum and analyzing the components and the concentration of the gas to be detected.
Preferably, the output light path of the laser is sequentially provided with a first lens, a second lens and a first reflector, and the reflection light path of the first reflector is sequentially provided with a first focusing lens and the first gas cavity.
Preferably, the first lens and the second lens form a telescope system, the first lens and the second lens are coaxially mounted with the laser, and the position and the distance between the first lens and the second lens are adjustable.
Preferably, the first reflector, the second reflector and the first focusing lens are coaxial, and the positions and angles of the first reflector and the second reflector are adjustable.
Preferably, two ends of the hollow anti-resonance optical fiber are respectively fixed in the first gas cavity and the second gas cavity through clamps, and the axes of the first gas cavity, the hollow anti-resonance optical fiber, the second gas cavity and the first focusing lens are overlapped.
Preferably, one end of the first gas cavity, which is close to the first focusing lens, is provided with a first optical window, and the other end of the first gas cavity is sealed with the hollow anti-resonance optical fiber; and a second optical window is arranged at one end of the second gas cavity for outputting laser, and the other end of the second gas cavity is sealed with the hollow anti-resonance optical fiber.
Preferably, the upper part of the first gas cavity is communicated with the upper part of the second gas cavity through an exhaust pipeline, a gas collecting device is arranged on the exhaust pipeline and used for collecting detected gas, a first gas valve and a first pressure gauge are arranged on the exhaust pipeline of the gas collecting device to the first gas cavity, and a second gas valve and a second pressure gauge are arranged on the exhaust pipeline of the gas collecting device to the second gas cavity.
Preferably, the lower part of the first gas cavity is communicated with the lower part of the second gas cavity through an inflation pipeline, the inflation pipeline is connected with a gas pump, and a gas inlet of the gas pump is communicated with the gas to be detected and is used for inflating the gas to be detected into the inflation pipeline; and a third gas valve is arranged on an inflation pipeline of the gas pump to the first gas cavity, and a fourth gas valve is arranged on an inflation pipeline of the gas pump to the second gas cavity.
Preferably, a first check valve is arranged at the communication position of the gas pump and the inflation pipeline, and a second check valve is arranged at the gas inlet of the gas pump.
Preferably, a second focusing lens and a collecting optical fiber are arranged on one side of the second gas cavity, which outputs laser light, and the axes of the second focusing lens and the collecting optical fiber are coincident with the axis of the hollow anti-resonance optical fiber.
The application provides a gas detection system based on a hollow anti-resonance optical fiber, gas to be detected is filled into the hollow anti-resonance optical fiber through the relation between the Raman intensity of the gas and the concentration of the gas, and the hollow anti-resonance optical fiber has the characteristics of low transmission loss, wide transmission bandwidth, small bending loss, high damage threshold and single-mode transmission maintenance, so that the Raman scattering of the gas can be enhanced by utilizing the hollow anti-resonance optical fiber, the Raman scattering threshold is reduced, and the components and the concentration of trace gas can be detected by using pumping light with lower power; simultaneously, can also collect the gas after detecting, avoid causing the pollution to the environment, consequently, the system of this application can be used for the detection of the composition and the concentration of trace gas, can also be used to the detection of the composition and the concentration of multiple mist, has fine application prospect in the aspect of atmosphere pollution, environmental monitoring, oil gas exploitation and bio-medical treatment.
Drawings
FIG. 1 is a schematic diagram of a gas detection system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a hollow-core antiresonant optical fiber according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first gas chamber according to an embodiment of the invention.
Reference numerals:
laser 1 laser beam 2 first lens 3 second lens 4
First mirror-5 second mirror-6 first focusing lens-7 first optical window-8
First gas cavity-9 hollow anti-resonant optical fiber-10 second gas cavity-11 collection optical fiber-14
Second optical window-12 second focusing lens-13 spectrometer-15 data processing device-16
Second pressure gauge-17 second gas valve-18 gas collecting device-19 first gas valve-20
First pressure gauge-21 third gas valve-22 fourth gas valve-23 first check valve-24
Gas pump-25 second check valve-26 exhaust line-27 inflation line-28
Core region-101 cladding region-102 pipe interface-29 fiber interface-30
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, a gas detection system based on a hollow-core anti-resonant fiber 10 is shown, which comprises a laser 1, a first gas cavity 9, a hollow-core anti-resonant fiber 10, a second gas cavity 11, a spectrometer 15 and a data processing device 16; two ends of the hollow anti-resonance optical fiber 10 are respectively communicated with the first gas cavity 9 and the second gas cavity 11; the first gas cavity 9 and the second gas cavity 11 are used for injecting gas to be detected into the hollow anti-resonance optical fiber 10; the laser 1 is used for emitting a laser beam 2 and inputting detection laser into the hollow anti-resonance optical fiber 10; the spectrometer 15 is configured to measure raman scattered light generated by the gas to be detected, and the data processing device 16 is configured to process the raman spectrum and analyze the composition and concentration of the gas to be detected.
The hollow-core antiresonant Optical fiber 10 conducts light by utilizing antiresonant Reflecting Optical Waveguide (ARROW), that is, in the hollow-core antiresonant Optical fiber 10, when the thickness t of the quartz wall is determined, the wavelength satisfies the formula
The light (n is the refractive index of quartz, m is a positive integer) can resonate in the quartz and leak out of the cladding, the light with other wavelengths can reflect back to the fiber core due to antiresonance so as to be transmitted, therefore, the light guide passband (200-800THz) is very wide, the loss is very small, a better carrier is provided for gas Raman scattering research, the fiber core of the hollow antiresonance fiber 10 is generally in the micron order, the cross-sectional area of the light can be very small, the light spot density is increased, the loss of the hollow fiber is relatively small, a very long fiber can be used, and the interaction distance between the light and the gas is greatly increasedIn addition, the Raman threshold of the gas can be greatly reduced, the required power of the laser 1 can be very low, only a trace amount of gas can generate Raman scattering, and the Raman scattering detector can be used for detecting the components and the concentrations of the trace amount of gas and can also be used for detecting the components and the concentrations of various mixed gases.
As shown in fig. 2, the hollow-core antiresonant optical fiber 10 employed in the present embodiment includes a core region 101 having a low refractive index and a cladding region 102 having a high refractive index, and the cladding region 102 having a high refractive index is composed of an inner cladding region and an outer cladding region together. The low-refractive-index core region 101 is air; the inner cladding region is formed by arranging a plurality of micro-capillaries, and the innermost side (closest to the fiber core) of the inner cladding region is not contacted with one circle of micro-capillaries, has no node and has a negative curvature structure; the outer cladding region is formed of a solid material having a uniform refractive index distribution, and the solid material used herein is the same as the material of the inner cladding region and is silicon dioxide.
The laser 1 is used for pumping Raman scattering generated by gas filled into the hollow-core anti-resonance optical fiber 10 from the first gas cavity 9, the strength of the Raman scattering can be enhanced through the hollow-core anti-resonance optical fiber 10, Raman frequency shift amounts corresponding to different gases are different, the generated Raman scattering light is also different, components of the gases can be detected according to different Raman scattering light, and the relationship between the Raman scattering strength and the gas concentration follows the following equation:
wherein I0Light intensity, I, of the laser 1RThe intensity of Raman scattering, n is the density of the measured gas molecules, the efficiency of the eta experimental device, the absolute differential of the (d sigma)/(d omega) Raman scattering cross section, the solid angle of omega signal collecting light, alphaLLoss of the fiber to the pump laser, αRThe loss of raman scattered light generated by the gas by the optical fiber.
The gas components and the gas concentration are detected according to the difference of different gas Raman spectrums and the relation between the gas Raman intensity and the gas concentration, compared with the traditional gas detection system based on the Raman scattering effect, the hollow-core anti-resonance optical fiber 10 used by the system has the characteristics of low transmission loss, wide transmission bandwidth, small bending loss, high damage threshold value and capability of keeping single-mode transmission, and the gas Raman scattering can be enhanced by utilizing the hollow-core anti-resonance optical fiber 10, so that the Raman scattering threshold value is low, and the required pumping light power can be very small.
In this embodiment, a first lens 3, a second lens 4, and a first reflector 5 are sequentially disposed on a laser light path output by the laser 1, and a first focusing lens 7 and the first gas cavity 9 are sequentially disposed on a reflection light path of the first reflector 5.
Specifically, the first lens 3 and the second lens 4 form a telescope system, the first lens 3 and the second lens 4 are coaxially mounted with the laser 1, and the positions and the distances between the first lens 3 and the second lens 4 are adjustable. The spot diameter of the laser is changed by adjusting the first lens 3 and the second lens 4, so that the laser is matched with the mode field of the hollow anti-resonance fiber 10, the coupling efficiency is improved, the laser can be collimated and transmitted to the first focusing lens 7 by adjusting the first reflecting mirror 5 and the second reflecting mirror 6, and in the embodiment, the first focusing lens 7 is a focusing convex lens.
Specifically, the first reflector 5, the second reflector 6 and the first focusing lens 7 are coaxial, and the positions and angles of the first reflector 5 and the second reflector 6 are adjustable.
In this embodiment, two ends of the hollow anti-resonant fiber 10 are respectively fixed in the first gas cavity 9 and the second gas cavity 11 by clamps, and the axes of the first gas cavity 9, the hollow anti-resonant fiber 10, the second gas cavity 11 and the first focusing lens 7 are coincident. The first gas cavity 9 and the second gas cavity 11 are cylindrical, and two ends of the hollow anti-resonance optical fiber 10 are fixed in the first gas cavity 9 and the second gas cavity 11 through clamps.
In this embodiment, a first optical window 8 is disposed at one end of the first gas cavity 9 close to the first focusing lens 7, and the other end of the first gas cavity is sealed with a hollow anti-resonant fiber 10, and one end of the hollow anti-resonant fiber 10 in the first gas cavity 9 extends to a position close to the first optical window 8; one end of the second gas cavity 11, which outputs laser, is provided with a second optical window 12, the other end of the second gas cavity is sealed with the hollow anti-resonance optical fiber 10, and one end of the hollow anti-resonance optical fiber 10, which is positioned in the second gas cavity 11, extends to a position close to the second optical window 12. The optical window is an optical element directly exposed to the environment in the optical system, and can reduce the influence of the environment and the temperature on the laser transmission.
In this embodiment, the upper portion of the first gas chamber 9 is communicated with the upper portion of the second gas chamber 11 through an exhaust pipe 27, a gas collecting device 19 is disposed on the exhaust pipe 27, the gas collecting device 19 is used for collecting detected gas, a first gas valve 20 and a first pressure gauge 21 are disposed on the exhaust pipe 27 of the gas collecting device 19 leading to the first gas chamber 9, and a second gas valve 18 and a second pressure gauge 17 are disposed on the exhaust pipe 27 of the gas collecting device 19 leading to the second gas chamber 11.
The first pressure gauge 21 and the second pressure gauge 17 are used for measuring the pressure of the gas filled in the hollow-core anti-resonant optical fiber 10, the first gas valve 20 and the second gas valve 18 are used for controlling the output of the gas, and the gas collecting device 19 can collect the detected gas.
In the embodiment, the lower part of the first gas cavity 9 is communicated with the lower part of the second gas cavity 11 through an inflation pipeline 28, a gas pump 25 is connected to the inflation pipeline 28, and an air inlet of the gas pump 25 is communicated with the gas to be detected for inflating the gas to be detected into the inflation pipeline 28; the third gas valve 22 is arranged on the inflation pipeline 28 leading from the gas pump 25 to the first gas cavity 9, and the fourth gas valve 23 is arranged on the inflation pipeline 28 leading from the gas pump 25 to the second gas cavity 11. The gas pump 25 is communicated with the gas to be detected, the gas to be detected is filled into the first gas cavity 9 or the second gas cavity 11 through the inflation pipeline 28, the first check valve 24 is arranged at the communication position of the gas pump 25 and the inflation pipeline 28, and the second check valve 26 is arranged at the gas inlet of the gas pump 25, so that gas backflow can be prevented.
Specifically, in this embodiment, the gas to be detected can be filled into the inflation pipeline 28 through the gas pump 25, and only one of the third gas valve 22 and the fourth gas valve 23 can be opened, and the other one can be closed, so that the gas to be detected can circulate between the first gas cavity 9 and the second gas cavity 11, and further the gas to be detected enters the hollow-core anti-resonance optical fiber 10 to measure the gas components and the gas concentration; if the third gas valve 22 is opened, the fourth gas valve 23 is closed, the gas to be detected enters the first gas cavity 9 through the third gas valve 22, at the moment, the first gas valve 20 and the second gas valve 18 are closed, and the gas to be detected enters the second gas cavity 11 through the hollow anti-resonance optical fiber 10, meanwhile, the first pressure gauge 21 and the second pressure gauge 17 can detect the gas pressure in the first gas cavity 9 and the second gas cavity 11 at the same time, and only when the gas pressure in the first gas cavity 9 and the gas pressure in the second gas cavity 11 are the same, the detection is carried out, so that the gas to be detected does not completely flow through the hollow anti-resonance optical fiber 10, and the detection result is not accurate; if too much gas is filled, the gas pressure is too high or the difference between the gas pressures of the first gas cavity 9 and the second gas cavity 11 is large, the gas can be exhausted through the exhaust pipeline 27 for pressure reduction, specifically, if the gas to be detected is filled into the first gas cavity 9 firstly, the gas is preferentially discharged through the second gas valve 18, meanwhile, the gas is collected by the gas collecting device 19, if the gas to be detected is filled into the second gas cavity 11 firstly, the gas is preferentially discharged through the first gas valve 20, meanwhile, the gas collecting device 19 collects the gas, so that the environmental pollution caused by the exhaust is avoided; if the gas pressures in the first gas chamber 9 and the second gas chamber 11 are the same, the first gas valve 20 and the second gas valve 18 can be opened simultaneously to perform deflation and depressurization simultaneously.
As shown in fig. 3, which is a block diagram of the first gas chamber 9, two pipe joints 29 are provided at opposite upper and lower ends of the first gas chamber 9, respectively for communicating the inflation pipe 28 and the exhaust pipe 27; a first optical window 8 is arranged at one end of the first gas cavity 9 close to the first focusing lens 7, and an optical fiber interface 30 is arranged at the other end opposite to the first optical window 8 and used for connecting the hollow anti-resonant optical fiber 10.
In this embodiment, a second focusing lens 13 and a collecting fiber 14 are disposed on the side of the second gas chamber 11 outputting laser light, the second focusing lens 13 and the collecting fiber 14 are aligned with the axis of the hollow anti-resonant fiber 10, raman scattering light generated by the gas is collected into the collecting fiber 14 through the second focusing lens 13, the raman scattering light is input into the spectrometer 15 through the collecting fiber 14, the spectrometer 15 performs spectral measurement on the raman scattering light, the measured raman spectrum is transmitted to the data processing device 16, and the data processing device 16 detects the composition and concentration of the gas according to the relationship between the raman scattering intensity and the gas concentration.
The application provides a gas detection system based on a hollow anti-resonance optical fiber, gas to be detected is filled into the hollow anti-resonance optical fiber through the relation between the Raman intensity of the gas and the concentration of the gas, and the hollow anti-resonance optical fiber has the characteristics of low transmission loss, wide transmission bandwidth, small bending loss, high damage threshold and single-mode transmission maintenance, so that the Raman scattering of the gas can be enhanced by utilizing the hollow anti-resonance optical fiber, the Raman scattering threshold is reduced, and the components and the concentration of trace gas can be detected by using pumping light with lower power; simultaneously, can also collect the gas after detecting, avoid causing the pollution to the environment, consequently, the system of this application can be used for the detection of the composition and the concentration of trace gas, can also be used to the detection of the composition and the concentration of multiple mist, has fine application prospect in the aspect of atmosphere pollution, environmental monitoring, oil gas exploitation and bio-medical treatment.
Finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A gas detection system is characterized by comprising a laser, a first gas cavity, a hollow anti-resonance optical fiber, a second gas cavity, a spectrometer and a data processing device; two ends of the hollow anti-resonance optical fiber are respectively communicated with the first gas cavity and the second gas cavity; the first gas cavity and the second gas cavity are used for injecting gas to be detected into the hollow anti-resonance optical fiber; the laser is used for inputting detection laser into the hollow anti-resonance optical fiber; the spectrometer is used for measuring Raman scattering light generated by the gas to be detected, and the data processing device is used for processing the Raman spectrum and analyzing the components and the concentration of the gas to be detected;
the upper part of the first gas cavity is communicated with the upper part of the second gas cavity through an exhaust pipeline, a gas collecting device is arranged on the exhaust pipeline and is used for collecting detected gas, a first gas valve and a first pressure gauge are arranged on the exhaust pipeline of the gas collecting device to the first gas cavity, and a second gas valve and a second pressure gauge are arranged on the exhaust pipeline of the gas collecting device to the second gas cavity;
after filling the hollow anti-resonance optical fiber with the gas to be detected, exhausting and depressurizing can be carried out through an exhaust pipeline;
if the gas to be detected is filled into the first gas cavity, the gas is discharged through the second gas valve; if the gas to be detected is filled into the second gas cavity, the gas is discharged through the first gas valve.
2. The gas detection system of claim 1, wherein a first lens, a second lens and a first reflector are sequentially disposed on the output light path of the laser, and a first focusing lens and the first gas chamber are sequentially disposed on the reflected light path of the first reflector.
3. The gas detection system of claim 2, wherein the first lens and the second lens form a telescope system, the first lens and the second lens are coaxially mounted with the laser, and the position and the distance between the first lens and the second lens are adjustable.
4. The gas detection system of claim 2, wherein the first mirror, the second mirror and the first focusing lens are coaxial, and the first mirror and the second mirror are adjustable in position and angle.
5. The gas detection system of claim 2, wherein two ends of the hollow-core anti-resonant fiber are respectively fixed in the first gas cavity and the second gas cavity by clamps, and axes of the first gas cavity, the hollow-core anti-resonant fiber, the second gas cavity and the first focusing lens are coincident.
6. The gas detection system of claim 5, wherein the first gas chamber has a first optical window at one end near the first focusing lens and is sealed to the hollow antiresonant optical fiber at the other end; and a second optical window is arranged at one end of the second gas cavity for outputting laser, and the other end of the second gas cavity is sealed with the hollow anti-resonance optical fiber.
7. The gas detection system according to claim 1, wherein the lower part of the first gas chamber is communicated with the lower part of the second gas chamber through an inflation pipeline, a gas pump is connected to the inflation pipeline, and a gas inlet of the gas pump is communicated with the gas to be detected for inflating the gas to be detected into the inflation pipeline; and a third gas valve is arranged on an inflation pipeline of the gas pump to the first gas cavity, and a fourth gas valve is arranged on an inflation pipeline of the gas pump to the second gas cavity.
8. The gas detection system of claim 7, wherein a first check valve is disposed at a location where the gas pump communicates with the inflation conduit, and a second check valve is disposed at an air inlet of the gas pump.
9. The gas detection system of claim 1, wherein the second gas cavity is provided with a second focusing lens and a collecting optical fiber at a laser output side, and the second focusing lens and the collecting optical fiber are coincident with the axis of the hollow-core anti-resonant optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710953540.5A CN107884382B (en) | 2017-10-13 | 2017-10-13 | Gas detection system based on hollow anti-resonance optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710953540.5A CN107884382B (en) | 2017-10-13 | 2017-10-13 | Gas detection system based on hollow anti-resonance optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107884382A CN107884382A (en) | 2018-04-06 |
| CN107884382B true CN107884382B (en) | 2021-07-06 |
Family
ID=61781347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710953540.5A Active CN107884382B (en) | 2017-10-13 | 2017-10-13 | Gas detection system based on hollow anti-resonance optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107884382B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344727B (en) * | 2018-04-27 | 2024-01-30 | 中国石油化工集团有限公司 | Raman signal collection system and method |
| CN108760718B (en) * | 2018-08-03 | 2023-09-19 | 华南师范大学 | SERS probe based on hollow anti-resonance optical fiber and preparation method thereof |
| CN108918505B (en) * | 2018-09-19 | 2023-11-03 | 吉林大学 | Polarized gas Raman spectrum measurement system |
| CN110501777B (en) * | 2019-07-28 | 2020-05-26 | 复旦大学 | Hollow anti-resonance optical fiber polarization filter |
| WO2021032669A1 (en) * | 2019-08-20 | 2021-02-25 | Omicron Electronics Gmbh | Apparatus and method for analyzing gas |
| CN110568547B (en) * | 2019-08-21 | 2020-07-07 | 武汉安扬激光技术有限责任公司 | Gas filling device and gas filling method for hollow-core photonic crystal fiber |
| CN113325509B (en) * | 2021-06-04 | 2022-08-16 | 浙江师范大学 | Optical fiber multi-pass cell based on microstructure optical fiber |
| CN113552110A (en) * | 2021-07-16 | 2021-10-26 | 中国民航大学 | Raman spectrum-based dynamic early warning system and method for thermal runaway of lithium ion battery |
| CN113588624A (en) * | 2021-08-03 | 2021-11-02 | 武汉理工大学 | Hollow optical fiber-based vacuum air cavity and gas detection system |
| CN113534332B (en) * | 2021-08-03 | 2023-07-28 | 武汉理工大学 | Space filtering system of hollow anti-resonance optical fiber gas Raman spectrum |
| CN113588623B (en) * | 2021-08-03 | 2022-07-08 | 武汉理工大学 | Hollow optical fiber enhanced gas Raman spectrum detection system based on end surface coating |
| CN115436337B (en) * | 2022-08-29 | 2024-04-12 | 中国科学院上海光学精密机械研究所 | Hollow fiber transmission detection module based on multiplexing anti-resonance |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6594288B1 (en) * | 2000-11-06 | 2003-07-15 | Cidra Corporation | Tunable raman laser and amplifier |
| CN203339470U (en) * | 2013-05-22 | 2013-12-11 | 中国计量学院 | Hollow-core photonic crystal optical fiber and sealed cavity combined type 1.9 [mu]m wavelength converter |
| CN105241865A (en) * | 2015-10-27 | 2016-01-13 | 杭州电子科技大学 | Raman gas analyzing device of column vector field excited hollow core photonic crystal fiber |
| CN105807363B (en) * | 2016-05-13 | 2019-01-29 | 北京工业大学 | A kind of hollow antiresonance optical fiber |
| CN106253047B (en) * | 2016-09-13 | 2017-10-03 | 中国人民解放军国防科学技术大学 | Tunable mid-infrared light fibre mixed gas cascade Ramar laser |
| CN106768859B (en) * | 2016-12-09 | 2019-03-19 | 中国科学院物理研究所 | A kind of spectrum widening device based on large mode field antiresonance hollow-core photonic crystal fiber |
-
2017
- 2017-10-13 CN CN201710953540.5A patent/CN107884382B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107884382A (en) | 2018-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107884382B (en) | Gas detection system based on hollow anti-resonance optical fiber | |
| CN104237135B (en) | CO gas detecting systems and method based on quartz tuning fork strengthened optoacoustic spectroscopy | |
| CN100468049C (en) | Detection method for Optical-fiber transmitting infrared absorption type methane gas | |
| CN105424631B (en) | A kind of hypersensitivity nitrogen oxides measuring system based on UV, visible light wave band absorption spectrum | |
| US10466174B2 (en) | Gas analyzer including a radiation source comprising a black-body radiator with at least one through-hole and a collimator | |
| CN101587077B (en) | Optical fibre sensor structure | |
| CN104122214A (en) | Cavity enhanced absorption spectrometer for simultaneous detection of aerosol extinction and scattering coefficients | |
| CN104949958A (en) | Novel Raman probe based on optical fiber beam splitter | |
| US20180136166A1 (en) | Photoacoustic detector | |
| CN105651703A (en) | Method for measuring extinction coefficient of ring-down gas of optical cavity based on change of cavity length | |
| CN104949920A (en) | Reflective gas sensing system based on hollow-core photonic crystal fiber | |
| CN109655446B (en) | Triangular resonant cavity/integrating sphere combined enhancement cavity for improving gas Raman intensity | |
| CN105548023B (en) | A kind of evanescent wave type optoacoustic spectroscopy minimum gas sensor and measurement method based on fiber resonance cavity | |
| CN103308482A (en) | Aerosol scattering and extinction measurement device | |
| CN110411960A (en) | A kind of cavity ring-down spectroscopy instrument system | |
| KR101299135B1 (en) | Reflective probe type apparatus for detecting gas and method for detecting gas using optical fiber with hollow core | |
| CN105572099A (en) | Laser Raman gas detection device based on concentric endoscope | |
| CN106124407A (en) | A kind of optical cavity, the aerosol extinction instrument with this optical cavity and the measuring method of Aerosol Extinction | |
| CN105675581A (en) | Raman scattering collection device for gas in free space | |
| Li et al. | Measurement of low gas concentrations using photonic bandgap fiber cell | |
| CN204374087U (en) | A kind of Raman spectrum test macro based on liquid core waveguide | |
| CN103954587A (en) | Method and device for detecting hydroxyl in quartz glass | |
| CN112098351A (en) | Photoacoustic spectrometer suitable for aerosol absorption and extinction coefficient synchronous measurement | |
| CN105548139A (en) | Laser Raman gas detection system based on crossed closed light paths | |
| CN217484253U (en) | Photoacoustic spectrum nitrogen dioxide analyzer based on laser diode |
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 |