CN208818645U - Multi-component harmful gas detection system based on hollow-core fiber SERS spectra - Google Patents
Multi-component harmful gas detection system based on hollow-core fiber SERS spectra Download PDFInfo
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- CN208818645U CN208818645U CN201821544364.6U CN201821544364U CN208818645U CN 208818645 U CN208818645 U CN 208818645U CN 201821544364 U CN201821544364 U CN 201821544364U CN 208818645 U CN208818645 U CN 208818645U
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Abstract
In particular to a kind of multi-component harmful gas detection system based on hollow-core fiber SERS spectra of the utility model, including sequentially connected pump light source, first fiber coupler, optical fiber laser, second fiber coupler, hollow-core fiber component, Raman spectrometer and processing unit, the pump light source enters in optical fiber laser after the first fiber coupler focuses coupling for generating pump light, the laser of optical fiber laser excitation is incident upon in hollow-core fiber component by the second fiber coupler, gold and silver multi-layer core-shell nano particle and under test gas in hollow-core fiber component react under laser action and generate Raman light, Raman spectrometer receives Raman light and obtains the Raman spectrogram of under test gas, processing unit is handled to obtain the gas component under test gas to Raman spectrogram.The system is very easy to use, quick, while can accurately and fast detect to multi-component harmful gas.
Description
Technical field
It is the utility model relates to Gas Thickness Detecting Technology field, in particular to a kind of based on hollow-core fiber SERS spectra
Multi-component harmful gas detection system.
Background technique
Mine pernicious gas is the various gases for being unfavorable for human health that coal (rock) body is gushed out and generated in production process
Common name, including carbon monoxide, nitrogen dioxide, sulfur dioxide, hydrogen sulfide, ammonia etc..Mine air is from the fresh of ground
The mixture of pernicious gas and floating dust that air and underground generate, so, when underground operators work, pernicious gas in mine
Moment threatens their life security.The concentration of clear stipulaties underground pernicious gas must not surpass in " safety regulations in coal mine "
Cross following level: CO (24ppm), NO2(25ppm)、SO2(5ppm)、H2S(6.6ppm)、NH3(40ppm)。
Surface enhanced Raman spectroscopy (abbreviation SERS) is obtained as a kind of novel analytical technology combined with nanotechnology
Huge breakthrough, may be implemented the detection of unimolecule magnitude, and can provide the finger print information of molecular structure.SERS spectra is not only
Has the advantages that Raman spectrum, detection sensitivity is also much higher than other common Raman detections.SERS is as a kind of hypersensitive
Detection method is widely applied in fields such as environment measuring, medical diagnosis, bioanalysis, chemical, public safeties.
But in terms of it is used for gas detection, the method that currently used Raman spectrum does not take enhancing, in gas Raman spectrum
Enhance mechanism, SERS substrate synthesizes, there is also problems for Raman signal acquisition aspect.
Utility model content
The multi-component harmful gas detection based on hollow-core fiber SERS spectra that the purpose of this utility model is to provide a kind of
System can accurately and fast detect multi-component harmful gas.
In order to achieve the above object, the technical solution adopted in the utility model are as follows: including sequentially connected pump light source, first
Fiber coupler, optical fiber laser, the second fiber coupler, hollow-core fiber component, Raman spectrometer and processing unit, it is described
Pump light source for generate pump light by the first fiber coupler focus coupling after enter optical fiber laser in, optical-fiber laser
The laser of device excitation is incident upon in hollow-core fiber component by the second fiber coupler, the gold and silver multilayer core in hollow-core fiber component
Core-shell nanoparticles and under test gas react under laser action and generate Raman light, and Raman spectrometer receives Raman light and obtains
The Raman spectrogram of under test gas, processing unit are handled to obtain the gas component under test gas to Raman spectrogram.
Compared with prior art, there are following technical effects for the utility model: passing through setting pump light source and optical-fiber laser
Device generates suitable laser, under the effect of the laser, in hollow-core fiber component in gold and silver multi-layer core-shell nano particle and to be measured
Gas reacts generate Raman light after received and processed by Raman spectrometer and processing unit, it is only necessary to be passed through into system to
Surveying gas can be realized automatic detection, very easy to use, quick, while testing result is very accurate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of system；
Fig. 2 is the structural schematic diagram of hollow-core fiber.
Specific embodiment
Below with reference to Fig. 1 to Fig. 2, the utility model is described in further detail.
Refering to fig. 1, a kind of multi-component harmful gas detection system based on hollow-core fiber SERS spectra, including be sequentially connected
Pump light source 10, the first fiber coupler 20, optical fiber laser 30, the second fiber coupler 40, hollow-core fiber component 50, draw
Graceful spectrometer 60 and processing unit 70, the pump light that the pump light source 10 generates are focused by the first fiber coupler 20
Enter in optical fiber laser 30 after coupling, the laser that optical fiber laser 30 excites is incident upon hollow by the second fiber coupler 40
In optical fiber component 50, gold and silver multi-layer core-shell nano particle and under test gas in hollow-core fiber component 50 occur under laser action
Raman light is reacted and generates, Raman spectrometer 60 receives Raman light and obtains the Raman spectrogram of under test gas, and processing unit 70 is right
Raman spectrogram is handled to obtain the gas component under test gas.By the way that pump light source 10 and optical fiber laser 30 is arranged,
Generate suitable laser, under the effect of the laser, in hollow-core fiber component 50 in gold and silver multi-layer core-shell nano particle and to be measured
Gas reacts generate Raman light after received and processed by Raman spectrometer 60 and processing unit 70, it is only necessary into system lead to
Entering under test gas can be realized automatic detection, very easy to use, quick, while testing result is very accurate.
It should be noted that reception and processing for Raman light, are not the key protection point of the utility model, Raman spectrum
Instrument is the equipment just having in the prior art, and goes out gas component according to Raman spectrum analysis, also there is many sides in the prior art
Case, common scheme is: processing unit is computer, by analysis, the place of installing software realization Raman spectrum on computers
Reason, the improvement of the utility model is not lain in here, so being no longer described in detail.
Preferably, the hollow-core fiber component 50 include third fiber grating 51, gas outlet 52, hollow-core fiber 53, into
Port 54 and the 4th fiber grating 55, what air inlet 54, hollow-core fiber 53 and the composition of gas outlet 52 were flowed through under test gas
Current path, third fiber grating 51 and the 4th fiber grating 55 constitute hollow-core fiber resonant cavity, gold and silver multi-layer core-shell nanometer
Grain is attached on the inner wall of hollow-core fiber 53.After third fiber grating 51 and the 4th fiber grating 55 is arranged, incident laser exists
The hollow-core fiber intra resonant cavity that the two is constituted ceaselessly vibrates back and forth, until laser energy runs out of, when exciting light is in hollow
It when passing through back and forth in fiber resonance cavity, can fully be acted on sample molecule, greatly improve point for participating in Raman scattering
Subnumber improves exciting light useful effect intensity indirectly, simultaneously because the photonic band gap effects that photonic crystal fiber is special, into one
Step improves Raman scattering intensities, and the Raman light of generation is by conducting intelligent acess to fiber Raman spectrometer 60, to obtain
Detect the Raman spectrogram of substance.
Further, the optical fiber laser 30 includes the first fiber grating 31, doped fiber 32 and the second optical fiber
Grating 33, the first fiber grating 31 and the second fiber grating 33 constitute laser resonator.First fiber grating 31 and the second optical fiber
Grating 33 is played the role of as third fiber grating 51 and the 4th fiber grating 55, is all to generate resonant cavity, is enhanced defeated
Laser intensity out.
Referring to Fig.2, preferably, the whole hollow-core fiber 53 is in hollow column, and hollow-core fiber 53 is provided centrally with
Fibre core airport 531, the periphery of fibre core airport 531 are arranged at intervals with covering airport 532, three covering skies of arbitrary neighborhood
The hole heart of stomata 532 is located on three vertex of equilateral triangle.After being arranged in this way, hollow-core fiber 53 can be greatly increased
Inner wall surface area can adhere to more gold and silver multi-layer core-shell nano particles in such hollow-core fiber 53.
Since the aperture of hollow-core fiber 53 is micron dimension, characteristic dimension is small, and gas flow field problem shows and macroscopical ruler
Different characteristic under degree, gas fill dynamic behavior and its complexity.If waiting for gas to be detected quietly fills full hollow-core fiber 53
Long time is needed, therefore here by way of applying positive pressure or negative pressure, pressure difference, air-flow are formed at 53 both ends of hollow-core fiber
Meet hydrodinamical model, the air exchanging rate of system can be greatly increased, the response time can foreshorten to several seconds.Here pass through
Two specific embodiments illustrate: first, being to be pumped into gas by way of positive pressure, the air inlet 54 is sequentially connected
Air pump, gas storage cylinder, under test gas is stored in gas storage cylinder, and air pump is used to the under test gas in gas storage cylinder being pumped into hollow
In optical fiber 53；Flowmeter is provided at the air inlet 54 or gas outlet 52 for monitoring under test gas in hollow-core fiber 53
Flow.Second, being to suck gas by way of negative pressure, the air inlet 54 connects gas storage cylinder, stores in gas storage cylinder
There is under test gas, gas outlet 52 connects vacuum pump, and vacuum pump is used to the under test gas in gas storage cylinder sucking hollow-core fiber 53
In；The air inlet 54 or gas outlet 52 goes out to be provided with flowmeter for monitoring the flow of under test gas in hollow-core fiber 53.
Claims (6)
1. a kind of multi-component harmful gas detection system based on hollow-core fiber SERS spectra, it is characterised in that: including successively connecting
The pump light source that connects, the first fiber coupler, optical fiber laser, the second fiber coupler, hollow-core fiber component, Raman spectrometer
And processing unit, the pump light source enter optical fiber after the first fiber coupler focuses coupling for generating pump light
In laser, the laser of optical fiber laser excitation is incident upon in hollow-core fiber component by the second fiber coupler, hollow-core fiber
Gold and silver multi-layer core-shell nano particle and under test gas in component react under laser action and generate Raman light, Raman light
Spectrometer receives Raman light and obtains the Raman spectrogram of under test gas, and processing unit handles Raman spectrogram to obtain gas to be measured
Gas component in body.
2. as described in claim 1 based on the multi-component harmful gas detection system of hollow-core fiber SERS spectra, feature exists
In: the hollow-core fiber component include third fiber grating, gas outlet, hollow-core fiber, air inlet and the 4th fiber grating,
Air inlet, hollow-core fiber and gas outlet constitute the current path flowed through under test gas, third fiber grating and the 4th optical fiber
Optical grating constitution hollow-core fiber resonant cavity, gold and silver multi-layer core-shell nano particle are arranged on the inner wall of hollow-core fiber.
3. as claimed in claim 2 based on the multi-component harmful gas detection system of hollow-core fiber SERS spectra, feature exists
In: the optical fiber laser include the first fiber grating, doped fiber and the second fiber grating, the first fiber grating and the
Two fiber gratings constitute laser resonator.
4. as claimed in claim 3 based on the multi-component harmful gas detection system of hollow-core fiber SERS spectra, feature exists
Integrally be in hollow column in: the hollow-core fiber, hollow-core fiber is provided centrally with fibre core airport, fibre core airport it is outer
Weekly interval is provided with covering airport, and the hole heart of three covering airports of arbitrary neighborhood is located at three vertex of equilateral triangle
On.
5. as claimed in claim 4 based on the multi-component harmful gas detection system of hollow-core fiber SERS spectra, feature exists
In: the air inlet is sequentially connected air pump, gas storage cylinder, and under test gas is stored in gas storage cylinder, and air pump is used for gas storage
Under test gas in steel cylinder is pumped into hollow-core fiber；Flowmeter is provided at the air inlet or gas outlet for monitoring hollow
The flow of under test gas in optical fiber.
6. as claimed in claim 4 based on the multi-component harmful gas detection system of hollow-core fiber SERS spectra, feature exists
In: the air inlet connects gas storage cylinder, and under test gas is stored in gas storage cylinder, and gas outlet connects vacuum pump, vacuum pump
For the under test gas in gas storage cylinder to be sucked in hollow-core fiber；The air inlet or gas outlet goes out to be provided with flowmeter use
The flow of under test gas in monitoring hollow-core fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821544364.6U CN208818645U (en) | 2018-09-17 | 2018-09-17 | Multi-component harmful gas detection system based on hollow-core fiber SERS spectra |
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| CN201821544364.6U CN208818645U (en) | 2018-09-17 | 2018-09-17 | Multi-component harmful gas detection system based on hollow-core fiber SERS spectra |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455778A (en) * | 2019-09-12 | 2019-11-15 | 中科院合肥技术创新工程院 | Apple volatilization gas detection method based on hollow-core fiber enhancing Raman spectrum |
| CN113029957A (en) * | 2021-03-31 | 2021-06-25 | 中国科学院长春光学精密机械与物理研究所 | Gas sensor based on evanescent wave |
| 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 |
-
2018
- 2018-09-17 CN CN201821544364.6U patent/CN208818645U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455778A (en) * | 2019-09-12 | 2019-11-15 | 中科院合肥技术创新工程院 | Apple volatilization gas detection method based on hollow-core fiber enhancing Raman spectrum |
| CN113029957A (en) * | 2021-03-31 | 2021-06-25 | 中国科学院长春光学精密机械与物理研究所 | Gas sensor based on evanescent wave |
| 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 |
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