CN206656954U - A kind of Sagnac interference-type optical fiber hydrogen gas sensors based on vernier enlarge-effect - Google Patents
A kind of Sagnac interference-type optical fiber hydrogen gas sensors based on vernier enlarge-effect Download PDFInfo
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- CN206656954U CN206656954U CN201720436594.XU CN201720436594U CN206656954U CN 206656954 U CN206656954 U CN 206656954U CN 201720436594 U CN201720436594 U CN 201720436594U CN 206656954 U CN206656954 U CN 206656954U
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- polarization maintaining
- optical fibre
- maintaining optical
- vernier
- coupler
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Abstract
It the utility model is related to a kind of Sagnac interference-type optical fiber hydrogen gas sensors based on vernier enlarge-effect.It is characterized in that including wideband light source, spectrometer, 2 × 2 three-dB coupler, two different lengths polarization maintaining optical fibre, single-mode fiber；The polarization maintaining optical fibre mistake axle welding of two described different lengths is obtained into one section of polarization maintaining optical fibre, tungstic acid platinum catalyst powder is applied in the surface of obtained polarization maintaining optical fibre；Two connection ends on the left of 2 × 2 three-dB coupler are connected with wideband light source and spectrometer respectively, and the both ends for the polarization maintaining optical fibre that two on the right side of 2 × 2 three-dB coupler connection end obtains with wrong axle welding respectively are connected, and realize the Sagnac interference spectrums of vernier amplification.Exothermic reaction occurs in the case where tungstic acid carries platinum powder catalytic using the high-temperature sensitivity characteristics and hydrogen and oxygen of Sagnac interference, realizes the measurement of density of hydrogen.The utility model have it is simple in construction, it is easily prepared, the advantages that high sensitivity.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, and in particular to a kind of Sagnac based on vernier enlarge-effect is done
Relate to type Optical Fider Hybrogen Sensor.
Background technology
Hydrogen is a kind of important raw material of industry, in fields such as petrochemical industry, electronics industry, metallurgical industry, food processings
Have a wide range of applications.Hydrogen content in air reaches 4%~70%, and running into naked light or electric spark will explode,
It is difficult to control during production, transport and use, easily leaks.Therefore, a kind of safe and reliable, hydrogen of high sensitivity is made
Gas sensor, so that the safe handling of hydrogen is very important.Fibre optical sensor is because of its small volume, good insulating, not by
The advantages that electromagnetic interference, is widely used in the fields such as oil, chemical industry, the energy.At present, Optical Fider Hybrogen Sensor obtain extensively and
In-depth study.Hydrogen gas sensor based on Applications of surface plasmon resonance, sensitivity is very high, and its key is accurate control gold
Belong to the thickness of film, it is necessary to use the instrument and equipment of costliness；Hydrogen gas sensor based on Fiber Bragg Grating FBG, because it has ripple
Divide the characteristic of multiplexing and be widely used in the distribution measuring of density of hydrogen, but sensitivity is generally relatively low.
With the development of optical fiber technology, optical fiber Sagnac interferometers are more next in the effect of fiber optic communication and sensory field of optic fibre
It is more important.The advantages that optical fiber Sagnac interferometers have simple in construction, highly reliable, electromagnetism interference, and precision is high, passed in optical fiber
Sense field has a wide range of applications, including temperature, pressure, stress, electric current and distortion sensing etc..
The problem of existing for above-mentioned Optical Fider Hybrogen Sensor, the utility model proposes one kind to be based on vernier enlarge-effect
Sagnac interference-type optical fiber hydrogen gas sensors, the sensor improves the sensitive of hydrogen gas sensor using vernier enlarge-effect
Degree, and have and be easy to make, advantages of simple structure and simple.
The content of the invention
The utility model provides a kind of Sagnac interference-type optical fiber hydrogen gas sensors based on vernier enlarge-effect, and it has
There is high sensitivity, it is simple in construction, the advantages that being easy to make.
The device that the utility model is taken for solution technical problem：
It is characterized in that including wideband light source, spectrometer, 2 × 2 three-dB coupler, two different lengths polarization maintaining optical fibre,
Single-mode fiber；The polarization maintaining optical fibre mistake axle welding of two described different lengths is obtained into one section of polarization maintaining optical fibre, in obtained polarization-maintaining
The surface coating tungstic acid platinum catalyst powder of optical fiber；Two connection ends difference on the left of 2 × 2 three-dB coupler
It is connected with wideband light source and spectrometer；The guarantor that two connection ends on the right side of 2 × 2 three-dB coupler obtain with wrong axle welding respectively
The fine both ends of polarisation are connected, and form a Sagnac with vernier enlarge-effect and interfere；
The length difference of the polarization maintaining optical fibre of described different length is 0.13 meter, the tungstic acid platinum carried catalysis of its side coating
The thickness of agent powder is 10-60 microns.
The beneficial effects of the utility model are：
1. only need to be by two connection ends on the right side of 2 × 2 three-dB coupler and mistake in Optical Fider Hybrogen Sensor preparation process
The both ends of the polarization maintaining optical fibre of axle welding are respectively connected with, and apply tungstic acid platinum catalyst powder in the surface of polarization maintaining optical fibre
End, have and prepare the advantages of facilitating.
2. Optical Fider Hybrogen Sensor described in is improved based on vernier enlarge-effect, the sensitivity of sensor.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the Sagnac interference-type optical fiber hydrogen gas sensors based on vernier enlarge-effect.
Embodiment
The utility model is further described below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of Sagnac interference-type optical fiber hydrogen gas sensors based on vernier enlarge-effect, including broadband light
Source (1), spectrometer (7), 2 × 2 three-dB coupler (2), polarization maintaining optical fibre (4), polarization maintaining optical fibre (5), single-mode fiber (3), by polarization-maintaining
The ending vertical of optical fiber (4) and polarization maintaining optical fibre (5) is cut, and wrong axle welding is carried out using heat sealing machine, in obtained polarization maintaining optical fibre
Surface coating tungstic acid platinum catalyst powder (6), two connection ends difference on the right side of 2 × 2 three-dB coupler (2)
The both ends of the polarization maintaining optical fibre obtained with wrong axle welding are connected, two connectivity ports on the left of 2 × 2 three-dB coupler (2) respectively with
The output end of wideband light source (1) is connected with the input of spectrometer (7) by single-mode fiber (3)；Spectrometer (7) is used as signal solution
Adjust part；The length difference of polarization maintaining optical fibre (4) and polarization maintaining optical fibre (5) is 0.13 meter, the tungstic acid platinum carried catalysis of its side coating
The thickness of agent powder (6) is 10-60 microns.
The light that wideband light source (1) is sent enters 2 × 2 three-dB coupler (2), and 2 × 2 three-dB coupler (2) is by flashlight
It is divided into the light that two beams transmit in opposite direction, arrives again at 2 × 2 by the polarization maintaining optical fibre of the wrong axle welding in loop respectively
Three-dB coupler (2), forms two sets of Sagnac interference spectrums in a Sagnac interference ring, and two sets of Sagnac interference spectrums are folded
In addition vernier enlarge-effect can be formed afterwards, produce the envelope cycle.By the guarantor of side coating tungstic acid platinum catalyst powder (6)
Polarisation fibre is placed in the space of density of hydrogen to be measured, hydrogen under the catalytic action of tungstic acid platinum catalyst powder (6) with oxygen
Oxidation reaction release heat occurs for gas so that the temperature rise of polarization maintaining optical fibre, because thermo-optic effect and thermal expansion effects to protect
The fine effective refractive index of polarisation and length variation with temperature change, so as to cause the envelope of Sagnac interference spectrums to float
Move.Change by demodulating spectral envelope may thereby determine that the concentration of space hydrogen to be measured.Experimental result such as table 1.
Table 1：Sagnac interferes the variation relation of envelope wavelength and density of hydrogen
| Density of hydrogen/% | 0% | 0.2% | 0.4% | 0.6% | 0.8% |
| Envelope wavelength/nm | 1502.90 | 1499.87 | 1496.83 | 1494.18 | 1491.14 |
Density of hydrogen rises to 0.8%, Sagnac interference wavelength from 0% and changes to 1491.14nm by 1502.90nm, becomes
Change amount is 11.76nm.As can be seen from the table, density of hydrogen and Sagnac interference Envelop waves length are linear, sensitive
Spend for -14.61nm/%, the sensitivity of the Sagnac interference hydrogen gas sensors formed compared to single hop polarization maintaining optical fibre -
7.877nm/% improves about 1.85 times.
The device can realize a kind of key of the Sagnac interference-type optical fiber hydrogen gas sensors based on vernier enlarge-effect
Technology has：
1. the control of two sections of polarization maintaining optical fibre length differences.The envelope cycle of the Sagnac interference spectrums formed after wrong axle welding
For：When Δ L is smaller, the envelope cycle is bigger, and the sensitivity of sensor is higher.Pass through theory analysis
And Experimental Research draw the two sections of polarization maintaining optical fibres that can produce vernier enlarge-effect length difference should between 0.03m~0.2m,
The high-acruracy survey to physical quantity can be realized using vernier enlarge-effect.
2. apply the length control of the polarization maintaining optical fibre of tungstic acid platinum catalyst powder.Apply tungstic acid platinum carried catalysis
The length of the polarization maintaining optical fibre of agent powder is longer, and the tungstic acid platinum catalyst powder used under equal conditions is more, and hydrogen exists
More with oxygen generation oxidation reaction release heat under the catalytic action of tungstic acid platinum catalyst powder, temperature change is brighter
It is aobvious.
In a specific embodiment of the present utility model, the length of two polarization maintaining optical fibres is respectively 1.9m and 1.77m, length
Difference is 0.13m, and the output wavelength of light source is 1200nm~1650nm；The operation wavelength coverage of spectrometer be 1200nm~
1650nm；Single-mode fiber is Standard single-mode fiber (G.625), and core diameter is 8.2 μm, and cladding diameter is 125 μm, polarization-maintaining
Optical fiber is panda type polarization-preserving fiber, and cladding diameter is 125 μm, and core diameter is 8.5 μm, and the tungstic acid of coating carries platinum and urged
The thickness of agent powder is 10-60 μm.
Claims (1)
1. a kind of Sagnac interference-type optical fiber hydrogen gas sensors based on vernier enlarge-effect, it is characterised in that including broadband light
Source, spectrometer, 2 × 2 three-dB coupler, polarization maintaining optical fibre, the single-mode fiber of two different lengths；It is different long by described two
The polarization maintaining optical fibre mistake axle welding of degree obtains one section of polarization maintaining optical fibre, is carried in the surface coating tungstic acid of obtained polarization maintaining optical fibre
Platinum catalyst powder；Two connection ends on the left of 2 × 2 three-dB coupler are connected with wideband light source and spectrometer respectively；2 × 2
The both ends for the polarization maintaining optical fibre that two connection ends on the right side of three-dB coupler obtain with wrong axle welding respectively are connected, and forming one has
The Sagnac interference of vernier enlarge-effect；
The length difference of the polarization maintaining optical fibre of described different length is 0.13 meter, the tungstic acid platinum catalyst powder of its side coating
The thickness at end is 10-60 microns.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720436594.XU CN206656954U (en) | 2017-04-21 | 2017-04-21 | A kind of Sagnac interference-type optical fiber hydrogen gas sensors based on vernier enlarge-effect |
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| CN201720436594.XU CN206656954U (en) | 2017-04-21 | 2017-04-21 | A kind of Sagnac interference-type optical fiber hydrogen gas sensors based on vernier enlarge-effect |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057307A (en) * | 2019-04-26 | 2019-07-26 | 华中科技大学 | A kind of method and fibre optic interferometer improving fibre optic interferometer strain sensitivity |
| CN111122512A (en) * | 2019-12-20 | 2020-05-08 | 天地（常州）自动化股份有限公司 | Polypyrrole coating optical fiber volatile organic compound sensor and manufacturing method thereof |
| CN113758902A (en) * | 2021-08-24 | 2021-12-07 | 比羿激光科技(湖州)有限公司 | Based on WO3Sagnac interference type optical fiber hydrogen sensor |
-
2017
- 2017-04-21 CN CN201720436594.XU patent/CN206656954U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057307A (en) * | 2019-04-26 | 2019-07-26 | 华中科技大学 | A kind of method and fibre optic interferometer improving fibre optic interferometer strain sensitivity |
| CN110057307B (en) * | 2019-04-26 | 2023-12-01 | 华中科技大学 | Method for improving strain sensitivity of optical fiber interferometer and optical fiber interferometer |
| CN111122512A (en) * | 2019-12-20 | 2020-05-08 | 天地（常州）自动化股份有限公司 | Polypyrrole coating optical fiber volatile organic compound sensor and manufacturing method thereof |
| CN113758902A (en) * | 2021-08-24 | 2021-12-07 | 比羿激光科技(湖州)有限公司 | Based on WO3Sagnac interference type optical fiber hydrogen sensor |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171121 Termination date: 20200421 |
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| CF01 | Termination of patent right due to non-payment of annual fee |