CN208705225U - A kind of fiber grating gas sensor - Google Patents
A kind of fiber grating gas sensor Download PDFInfo
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- CN208705225U CN208705225U CN201821428811.1U CN201821428811U CN208705225U CN 208705225 U CN208705225 U CN 208705225U CN 201821428811 U CN201821428811 U CN 201821428811U CN 208705225 U CN208705225 U CN 208705225U
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- gas sensor
- fiber grating
- grating gas
- fiber
- light source
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Abstract
The utility model provides a kind of fiber grating gas sensor, including fiber grating gas sensor, wideband light source and spectrometer；The input port light connects of the delivery outlet light connects of fiber grating gas sensor one end and wideband light source, the fiber grating gas sensor other end and spectrometer.Fiber grating gas sensor in the utility model is made of a single-mode fiber, fiber grating gas sensor is provided on optical fiber, it carries out the light that detection wideband light source issues and is uploaded to fiber grating gas sensor, it is analyzed by entering spectrometer after the reflection of fiber grating gas sensor, obtains the concentration of gas to be checked.Have many advantages, such as it is simple and practical in structure, to gas identification have specificity, anti-interference it is good, be suitable for complex conditions, be suitable for remote distributed sense.
Description
Technical field
The utility model belongs to fiber optic sensor technology field, is related to a kind of fiber grating gas sensor.
Background technique
In terms of industry security production, environmental quality and pollution monitoring, gas detection is had become in order to which one highly important
Content.Fibre optical sensor is widely used in gas sensing neck due to the features such as its own production is simple, electromagnetism interference, long service life
Domain, the common testing principle of fiber gas sensor have spectral absorption type, fluorescent type, chemical optical fibre material type etc..Wherein spectrum
Absorption process is most widely used in terms of detection gas concentration, and principle is sent out based on molecular vibration and rotation absorption spectra and light source
Light source consistency between light spectrum.Using this method detection gas concentration, it is necessary to be equipped with sample cell to hold gas, this is just
To the coupling of optical path, more stringent requirements are proposed, and influences the miniaturization and encapsulation of whole system, largely restricts
The combination of itself and optical fiber technology.
Utility model content
Just there is provided a kind of fiber grating gas sensors for the technical problems to be solved in the utility model, and benefit is by optical fiber light
Enter spectrometer after the reflection of grid gas sensor to be analyzed, obtains the concentration of gas to be checked.
A kind of fiber grating gas sensor, including fiber grating gas sensor, wideband light source and spectrometer；The light
The delivery outlet light connects of fine grating gas sensor one end and the wideband light source, the fiber grating gas sensor other end
With the input port light connects of the spectrometer.
It further, further include optical fiber, coupler, laser；The delivery outlet of the laser light source and the coupler
An input port light connects, another input port light connects of the delivery outlet of the wideband light source and the coupler；
The delivery outlet of the coupler and shown fiber port light connects；The input port of the spectrometer and the fiber port light connect
It connects；The input/output terminal of the fiber grating gas sensor and the Coupler ports light connects.
Further, the coat of the optical fiber in the fiber grating gas sensor is metal.
Further, gas chamber is used optical fibers as, and inscribes fiber grating gas sensor on it, is made using MOFBG
For wavelength selective reflection mirror, the reflective gas sensor of all -fiber is formed.
Fiber grating gas sensor in the utility model is made of a single-mode fiber, and optical fiber light is provided on optical fiber
Grid gas sensor carries out the light that detection wideband light source issues and is uploaded to fiber grating gas sensor, by fiber grating gas
Enter spectrometer after body sensor reflection to be analyzed, obtains the concentration of gas to be checked.With it is simple and practical in structure, to gas know
Do not have many advantages, such as that specificity, anti-interference are good, be suitable for complex conditions, be suitable for remote distributed sensing.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model fiber grating gas sensor.
Specific embodiment
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Optical fiber provided by the utility model is fully-reflected type, and the evanscent field energy in fully-reflected type optical fiber photonic crystal holes is big
Account for about the 10%~40% of gross energy.In order to realize the inscription of grating, and guarantee there is very strong evanscent field in hole, selects single-mode optics
Fibre is used as fully-reflected type optical fiber gas chamber.This optical fiber structure has very strong evanscent field, can improve the sensitivity of detection.
As shown in Figure 1, the utility model provides a kind of fiber grating gas sensor, including fiber grating gas sensing
Device 1, wideband light source 2 and spectrometer 3；The delivery outlet light connects of 1 one end of fiber grating gas sensor and wideband light source 2, optical fiber
The input port light connects of 1 other end of grating gas sensor and spectrometer 3.It further include optical fiber 4, coupler 5, laser 6；It is described
One input port light connects of the delivery outlet of 6 light source of laser and the coupler 5, the delivery outlet of the wideband light source 2 with
Another input port light connects of the coupler 5；The delivery outlet of the coupler 5 and shown 4 port light connects of optical fiber；Institute
State spectrometer 3 input port and the 4 port light connects of optical fiber；The input/output terminal of the fiber grating gas sensor 1 with
The 5 port light connects of coupler.
Optical fiber 4 is single mode optical fiber, and more than one fiber grating gas sensor 1, each optical fiber is arranged in single mode optical fiber
Corresponding reflection wavelength is arranged in grating gas sensor 1, and nearby under test gas does not have apparent absorption peak, this wavelength reflection returns
The signal come is used as reference signal.Cover a certain absorption peak of under test gas, the absorption for probe gas.
After inscribing fiber grating gas sensor 1 on optical fiber 4, the wavelength selection of fiber grating gas sensor 1 is utilized
Property and combine gas sorption features spectral line, realize to the Concentration Testing of specific gas.According to lambert's Bill absorption law and suddenly die
The characteristics of wave senses, the signal strength expression that fiber grating gas sensor 1 reflects are as follows:
LR=RI0exp [- 2r α (λ) CL]
Wherein I0 is probe source signal, and R is the reflectivity of fiber grating gas sensor 1, and r is the relatively clever of evanescent wave
Quick coefficient, α (λ) are absorption coefficient of the gas in af at wavelength lambda, and C is the concentration of gas, and L is the length of gas chamber.Wherein r and conduction
Mode effective refractive index, material refractive index is related and directly proportional to evanscent field energy specific gravity in hole in hole.
Pass through strength retrogression's situation of analysis reflection signal, so that it may obtain the concentration information of under test gas.Due to gas
The specificity of absorption line and the wavelength selection of fiber grating gas sensor 1 act on, and this detection method is just kept away from principle
The interference for having exempted from other gases, the advantages of having embodied specific selection.
Fiber grating gas sensor 1 is mixed made of the photo-thermal optical fiber of metallic element in sandwich layer, the optical fiber light that will be prepared
Grid gas sensor 1 is connected with coupler 5 and spectrometer 3, and coupler 5 is separately connected laser 6 and wideband light source 2 again.Laser
The wavelength of device 6, by adjusting the output power of laser 6, utilizes photo-thermal optical fiber 4 not in the spectral region of wideband light source 2
The effect that optical power is converted into heat is absorbed, changes the temperature of fiber grating gas sensor 1, to adjust fiber grating gas
The wavelength of sensor 1 shakes it in gas absorption peak or so.Gas suction is obtained by analyzing the reflection signal power recorded
The optical power of receipts obtains the concentration of institute's probe gas.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (3)
1. a kind of fiber grating gas sensor, which is characterized in that including fiber grating gas sensor (1), wideband light source (2)
With spectrometer (3)；The delivery outlet light connects of described fiber grating gas sensor (1) one end and the wideband light source (2), it is described
The input port light connects of fiber grating gas sensor (1) other end and the spectrometer (3).
2. a kind of fiber grating gas sensor according to claim 1, which is characterized in that further include optical fiber (4), coupling
Device (5), laser (6)；The delivery outlet of laser (6) light source and an input port light connects of the coupler (5),
The delivery outlet of the wideband light source (2) and another input port light connects of the coupler (5)；The coupler (5)
Delivery outlet and shown optical fiber (4) port light connects；The input port of the spectrometer (3) and the optical fiber (4) port light connects；Institute
State the input/output terminal and the coupler (5) port light connects of fiber grating gas sensor (1).
3. a kind of fiber grating gas sensor according to claim 1, which is characterized in that the fiber grating gas passes
The coat of optical fiber (4) in sensor (1) is metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821428811.1U CN208705225U (en) | 2018-08-31 | 2018-08-31 | A kind of fiber grating gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821428811.1U CN208705225U (en) | 2018-08-31 | 2018-08-31 | A kind of fiber grating gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208705225U true CN208705225U (en) | 2019-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821428811.1U Active CN208705225U (en) | 2018-08-31 | 2018-08-31 | A kind of fiber grating gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208705225U (en) |
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2018
- 2018-08-31 CN CN201821428811.1U patent/CN208705225U/en active Active
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