CN205691493U - A kind of sagnac interferometer hydrogen gas sensor based on photonic crystal polarization maintaining optical fibre - Google Patents
A kind of sagnac interferometer hydrogen gas sensor based on photonic crystal polarization maintaining optical fibre Download PDFInfo
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- CN205691493U CN205691493U CN201620647117.3U CN201620647117U CN205691493U CN 205691493 U CN205691493 U CN 205691493U CN 201620647117 U CN201620647117 U CN 201620647117U CN 205691493 U CN205691493 U CN 205691493U
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- Prior art keywords
- photonic crystal
- optical fibre
- polarization maintaining
- maintaining optical
- sagnac interferometer
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Abstract
The utility model discloses a kind of sagnac interferometer hydrogen gas sensor based on photonic crystal polarization maintaining optical fibre, including wideband light source, spectrogrph and sagnac interferometer, it is characterized in that: described sagnac interferometer includes that the bonder of 2*2 and side are coated with the photonic crystal polarization maintaining optical fibre of Tungstic anhydride. platinum catalyst powder, and in the pore within photonic crystal polarization maintaining optical fibre, fill ethanol, wherein, wideband light source and spectrogrph are connected with the two ends of bonder；Again by remaining for bonder left and right connect end respectively with the welding of photonic crystal fiber two ends, constitute a sagnac interferometer.This utility model has the advantages that preparation is simple, volume is little and highly sensitive.
Description
Technical field
This utility model belongs to technical field of optical fiber sensing, is specifically related to a kind of Sa Ge based on photonic crystal polarization maintaining optical fibre
Nanogram interferometer hydrogen gas sensor.
Background technology
Hydrogen as a kind of clean energy resource, have potential can the energy that utilizes of Infinite Cyclic.In petrochemical industry, metallurgical work
The aspects such as industry have a wide range of applications；But the aerial volumetric concentration of hydrogen easily sets off an explosion between 4%-75%,
So the Leak Detection of hydrogen is extremely important.Optical Fider Hybrogen Sensor, owing to having safety and the advantage of monitoring in real time, has this
Matter is explosion-proof, volume is little, lightweight, corrosion-resistant, electromagnetism interference, highly sensitive and precision advantages of higher, is widely applied to hydrogen
Gas Concentration Testing.The type of Optical Fider Hybrogen Sensor mainly has optical fiber interference type, microlens type, evanscent field type and Bragg grating
Type etc..Hydrogen gas sensor based on Fiber Bragg Grating FBG, because it has the characteristic of wavelength-division multiplex and to be widely used in hydrogen dense
The distribution measuring of degree, its capacity of resisting disturbance and stability are strong, but its making of this sensor is complicated and sensitivity is the most relatively low.Collection
Becoming the hydrogen gas sensor of optical microstructures, simple in construction is highly sensitive, but its complex manufacturing process, thus it is extensive to also limit it
Application.The method that interference-type hydrogen gas sensor typically utilizes capillary tube to encapsulate makes, and its manufacturing process is complicated, and sensitivity is not
High.Hydrogen Fibre Optical Sensor based on metal, and the most protected from environmental.Optical fiber fadout field pattern Optical Fider Hybrogen Sensor utilizes gold
Belonging to the change of evanescent field in coating and detect the concentration of hydrogen, this sensor is to making complexity.Based on surface plasma altogether
The hydrogen gas sensor of technology of shaking, uses expensive instrument and equipment accurately to control the thickness of metal film, and cost is high and makes multiple
Miscellaneous.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, this utility model provides a kind of Sa based on photonic crystal polarization maintaining optical fibre
Lattice nanogram interferometer hydrogen gas sensor, its preparation flow: ethanol will be filled in the pore within photonic crystal polarization maintaining optical fibre, then will
Its side coating Tungstic anhydride. platinum catalyst, has and prepares convenient, simple in construction and highly sensitive advantage.
The technical scheme that this utility model is used: a kind of sagnac interferometer hydrogen based on photonic crystal polarization maintaining optical fibre
Gas sensor, including wideband light source, spectrogrph and sagnac interferometer, it is characterised in that: described sagnac interferometer
Bonder and its side of photonic crystal polarization maintaining optical fibre including 2*2 are coated with Tungstic anhydride. platinum catalyst powder, and at photon
Pore within crystal polarization maintaining optical fibre is filled ethanol, wherein wideband light source and spectrogrph is connected with the two ends of bonder；Again
By remaining for bonder left and right connect end respectively with the welding of photonic crystal fiber two ends, constitute a sagnac interferometer.
The a length of 20-150mm of described photonic crystal polarization maintaining optical fibre, the Tungstic anhydride. platinum catalyst of its side coating
The thickness of powder is 10-50um.
The beneficial effects of the utility model are:
1. sensor preparation process only need to use general commercial optical fiber splicer by the connection end of bonder respectively with light
The welding respectively of the two ends of photonic crystal fiber, and in the pore of photonic crystal polarization maintaining optical fibre, fill ethanol, then it is coated with in its side
Apply Tungstic anhydride. platinum catalyst powder, have and prepare convenient, advantages of simple structure and simple.
2. the operation principle of the hydrogen gas sensor described in is: the hydrogen in air is at Tungstic anhydride. platinum catalyst powder
React with oxygen under catalytic action, this oxidation reaction process discharges heat, causes the temperature of photonic crystal polarization maintaining optical fibre
Raise, along with the change of temperature makes the refractive index being filled in the ethanol in photonic crystal polarization maintaining optical fibre change therewith, therefore light
The effective refractive index of sub-crystal polarization maintaining optical fibre changes, and makes the length of photonic crystal polarization maintaining optical fibre due to thermal expansion effects again
Elongated, cause the resonance wavelength of sagnac interferometer to be drifted about to short wavelength direction, we can be done by detection Sagnac
The resonance wavelength drift value of interferometer can accurately determine the concentration of Hydrogen in Air to be measured, and it is tool compared with general hydrogen gas sensor
There is highly sensitive advantage.
Accompanying drawing explanation
Fig. 1 is sagnac interferometer hydrogen gas sensor configuration schematic diagram based on photonic crystal polarization maintaining optical fibre.Wherein,
(1) bonder of 2*2, (2) side is coated with the photonic crystal polarization maintaining optical fibre of Tungstic anhydride. platinum catalyst powder.
Fig. 2 is the test system schematic of sagnac interferometer hydrogen gas sensor based on photonic crystal polarization maintaining optical fibre.
Wherein, (1) 2*2 bonder, the photonic crystal polarization maintaining optical fibre of (2) side coating Tungstic anhydride. platinum catalyst powder, (3) broadband
Light source, (4) spectrogrph.
Detailed description of the invention
The hydrogen gas sensor of the present invention calibrated is connected with wideband light source and spectrogrph respectively, side is applied three oxygen
The photonic crystal polarization maintaining optical fibre changing tungsten platinum catalyst powder is placed in the space of density of hydrogen to be measured.Hydrogen carries platinum at Tungstic anhydride.
Heat is discharged with oxygen generation oxidation reaction so that the temperature liter of photonic crystal polarization maintaining optical fibre under the catalytic action of catalyst fines
Height, owing to thermo-optic effect and thermal expansion effects make the effective refractive index of photonic crystal fiber and length variation with temperature occur
Change, thus interference spectrum drifts about, the interference spectrum of spectrogrph real time record sagnac interferometer hydrogen gas sensor, especially
Resonance wave long value in interference spectrum.By the change of comparison resonance wavelength so that it is determined that the concentration of space to be measured hydrogen.This hydrogen
The transducer sensitivity that sensor ratio is general wants height.
Claims (2)
1. a sagnac interferometer hydrogen gas sensor based on photonic crystal polarization maintaining optical fibre, including wideband light source, spectrogrph
And sagnac interferometer, it is characterised in that: described sagnac interferometer includes that the bonder of 2*2 and photonic crystal are protected partially
Its side of optical fiber is coated with Tungstic anhydride. platinum catalyst powder, and fills wine in the pore within photonic crystal polarization maintaining optical fibre
Essence, is wherein connected wideband light source and spectrogrph with the two ends of bonder；Again by remaining for bonder left and right connect end respectively with
The welding of photonic crystal fiber two ends, constitutes a sagnac interferometer.
A kind of sagnac interferometer hydrogen gas sensor based on photonic crystal polarization maintaining optical fibre the most according to claim 1,
It is characterized in that: a length of 20-150mm of described photonic crystal polarization maintaining optical fibre, the Tungstic anhydride. of its side coating carries platinum and urges
The thickness of agent powder is 10-50um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620647117.3U CN205691493U (en) | 2016-06-21 | 2016-06-21 | A kind of sagnac interferometer hydrogen gas sensor based on photonic crystal polarization maintaining optical fibre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620647117.3U CN205691493U (en) | 2016-06-21 | 2016-06-21 | A kind of sagnac interferometer hydrogen gas sensor based on photonic crystal polarization maintaining optical fibre |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205691493U true CN205691493U (en) | 2016-11-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620647117.3U Expired - Fee Related CN205691493U (en) | 2016-06-21 | 2016-06-21 | A kind of sagnac interferometer hydrogen gas sensor based on photonic crystal polarization maintaining optical fibre |
Country Status (1)
| Country | Link |
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| CN (1) | CN205691493U (en) |
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2016
- 2016-06-21 CN CN201620647117.3U patent/CN205691493U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161116 Termination date: 20170621 |