CN207051192U - A kind of self-calibration device based on the double F P verniers amplification hydrogen gas sensors of optical fiber microcavity - Google Patents
A kind of self-calibration device based on the double F P verniers amplification hydrogen gas sensors of optical fiber microcavity Download PDFInfo
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- CN207051192U CN207051192U CN201720436647.8U CN201720436647U CN207051192U CN 207051192 U CN207051192 U CN 207051192U CN 201720436647 U CN201720436647 U CN 201720436647U CN 207051192 U CN207051192 U CN 207051192U
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Abstract
It the utility model is related to a kind of self-calibration device based on the double F P verniers amplification hydrogen gas sensors of optical fiber microcavity, it is characterised in that including wideband light source, spectroanalysis instrument, three-dB coupler, single-mode fiber, double F P hydrogen sensing modules；Double F P hydrogen sensing modules are formed by hollow-core fiber, multimode fibre welding；Wherein hollow-core fiber forms the first F P optical fiber microcavitys；Multimode fibre outer surface is coated with silverskin, silver/palladium-based composite membrane, forms the 2nd F P optical fiber microcavitys.First F P optical fiber microcavity is used as " disjunction mark chi ", there is provided a series of datum lines, the 2nd F P optical fiber microcavity is used as " vernier scale ", to be measured for sensing；When density of hydrogen increase, silver/palladium-based composite membrane volume expands, and causes interference spectrum to move, and the change of detection interference wavelength can be obtained by the concentration of hydrogen.The problem of being drifted about for existing fiber hydrogen gas sensor zero-base, it is proposed that a kind of precision is high, the big self-calibration device based on the double F P verniers amplification hydrogen gas sensors of optical fiber microcavity of sensing range.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, more particularly to a kind of based on the double F-P verniers amplifications of optical fiber microcavity
The self-calibration device of hydrogen gas sensor.
Background technology
With China's rapid development of economy, the demand of the energy is growing day by day.And the energy such as present used oil, coal
Source is all non-renewable resources.Meanwhile the use of these energy can give off substantial amounts of carbon dioxide and greenhouse gases, to environment
Harm is big.Hydrogen Energy is a kind of pollution-free, and reserves are big, the high clean energy resource of calorific value, is the permanent strategy for ensureing energy security.But
It is that because hydrogen molecule amount is small, easily leakage, is being produced, and is stored, and transport, many potential safety hazards in use be present.Therefore, hydrogen
It must can be monitored during storage and use.Existing hydrogen gas sensor has catalysis type, heat-conducted, electrochemistry
A few major class products such as formula, optical profile type.But it can fully meet all market there is presently no any hydrogen gas sensor and want
Ask.The great demand in the Hydrogen Energy that faces the future market, constantly lift sensitivity, selectivity, response time and the stability of sensor
The always focus and difficult point of hydrogen sensing technology.
Fibre optical sensor is risen in the eighties, because it has good real-time, has the characteristics that higher sensitivity
Each neighborhood is had been widely used for, small, small volume is particularly influenceed by ambient temperature and humidity, it is in light weight, it is passive device, does not produce
Light a fire flower, these features of essential safety, optical fiber sensing technology causes extensive concern in hydrogen detection field.At present, common light
The type of fine hydrogen gas sensor mainly has optical fiber interference type, microlens type, evanscent field type and Bragg grating type etc..Palladium is because of it
There are good selectivity, permeability and absorbability to hydrogen and be generally used as in optics hydrogen sensing.When hydrogen runs into palladium,
Hydrogen can be hydrogen atom in palladium dissociation on surface, by diffusing into palladium body.When the density of hydrogen in environment reduces in palladium
Hydrogen can be combined into hydrogen desorption again, the reaction is reversible reaction.But still deposited in some special occasions, Optical Fider Hybrogen Sensor
In some shortcomings, such as without datum line, it may appear that zero-base drifts about, and measurement accuracy is not high；Easily cracking causes to measure model palladium film
Enclose small, the problems such as detectivity is not high.
For the deficiency in the presence of above-mentioned Optical Fider Hybrogen Sensor, solve the problems, such as drift, realize the high accuracy to hydrogen
Detection.It is this utility model proposes a kind of self-calibration device based on the double F-P verniers amplification hydrogen gas sensors of optical fiber microcavity
Device chooses one group of interference peaks in double F-P interference cavities and, as self-calibration line, solves the problems, such as drift, take full advantage of optical fiber microcavity
The double F-P interference structures formed, realize vernier enlarge-effect, are realized with reference to the silver palladium alloy film with high stability to hydrogen
High precision test.The fibre optical sensor manufactured according to this device has sensing hydrogen range big, and selective good, precision is high,
The advantages that response time is short, reproducible, and resisting temperature is disturbed.
Utility model content
The utility model provides a kind of self-calibration device based on the double F-P verniers amplification hydrogen gas sensors of optical fiber microcavity,
To solve the zero-base drifting problem of Optical Fider Hybrogen Sensor generally existing.
The utility model is that the technical solution adopted for solving the technical problem is：
A kind of self-calibration device based on the double F-P verniers amplification hydrogen gas sensors of optical fiber microcavity, by wideband light source (1), light
Compose analyzer (2), three-dB coupler (3), single-mode fiber (4), double F-P hydrogen sensing modules (5) composition, it is characterised in that：Institute
Double F-P hydrogen sensing modules (5) are stated to be formed by hollow-core fiber (6), multimode fibre (7) welding；Wherein hollow-core fiber (6) is formed
First F-P optical fiber microcavity (10)；Multimode fibre (7) forms the 2nd F-P optical fiber microcavity (11), and outer surface is coated with silverskin (8), and silver/
Palladium-based composite membrane (9)；Two ports of three-dB coupler (3) side are connected with wideband light source (1), spectroanalysis instrument (2) respectively,
The port of three-dB coupler (3) opposite side is connected by single-mode fiber (4) with double F-P hydrogen sensing modules (5)；Spectroanalysis instrument
(2) it is used as signal demodulation part；Hollow-core fiber (6), the length difference of multimode fibre (7) are 5 μm~50 μm, the thickness of silverskin (8)
2nm~10nm is should be, the thickness of silver/palladium-based composite membrane (9) should be 10nm~40nm.
The beneficial effects of the utility model are：
The utility model chooses one group of interference peaks in double F-P interference cavities and, as self-calibration line, solves the problems, such as drift, fill
Divide and make use of double F-P interference structures that optical fiber microcavity is formed, vernier enlarge-effect is realized, with reference to the silver with high stability
Palladium alloy membrane realizes the high precision test to hydrogen.The fibre optical sensor manufactured according to this device has sensing hydrogen range
Greatly, the advantages that selectivity is good, and precision is high, and the response time is short, reproducible, and resisting temperature is disturbed.
Brief description of the drawings
Fig. 1 is apparatus structure schematic diagram of the present utility model.
Fig. 2 is the structural representation of double F-P hydrogen sensing modules (5) of the present utility model.
Embodiment
The utility model is further described below in conjunction with the accompanying drawings.
Referring to accompanying drawing 1, a kind of self-calibration device based on the double F-P verniers amplification hydrogen gas sensors of optical fiber microcavity, including width
Band light source (1), spectroanalysis instrument (2), three-dB coupler (3), single-mode fiber (4), double F-P hydrogen sensing modules (5)；It is described double
F-P hydrogen sensing module (5) is formed by hollow-core fiber (6), multimode fibre (7) welding；Wherein hollow-core fiber (6) forms the first F-
P optical fiber microcavity (10)；Multimode fibre (7) forms the 2nd F-P optical fiber microcavity (11), and outer surface is coated with silverskin (8), and silver/palladium is compound
Film (9)；Two ports of three-dB coupler (3) side are connected with wideband light source (1), spectroanalysis instrument (2) respectively, 3dB couplings
The port of device (3) opposite side is connected by single-mode fiber (4) with double F-P hydrogen sensing modules (5)；Spectroanalysis instrument (2) conduct
Signal demodulation part.
Working method of the present utility model is：Wideband light source (1) produces flashlight, and 3dB is input to by single-mode fiber (4)
Flashlight is input to double F-P hydrogen sensing modules (5) by single-mode fiber (4) and held by coupler (3), three-dB coupler (3)
Face is reflected, and reflected light passes through single-mode fiber (4), the another port for the side that is connected by three-dB coupler (3) with wideband light source (1)
It is relevant to be output to spectroanalysis instrument (2).
The first outer no hydrogen sensitive membrane of F-P optical fiber microcavity (10), as " disjunction mark stable in self-calibration technology " double scale "
Chi ", a series of datum lines are provided for self-calibration technology, the 2nd F-P optical fiber microcavity (11) appearance is coated with silverskin (8), and silver/palladium is multiple
Film (9) is closed, it is to be measured for sensing as " vernier scale ", can be with movement to be measured；At this moment the double F-P verniers of optical fiber microcavity are put
Big hydrogen gas sensor has self calibrating function.
The scale that first F-P optical fiber microcavity (10) is corresponded respectively to inside slide measure with the 2nd F-P optical fiber microcavity (11)
And vernier, so double F-P hydrogen sensing modules (5) can realize the high-acruracy survey to hydrogen due to vernier enlarge-effect；
When density of hydrogen increase, after silver/palladium-based composite membrane (9) absorbs hydrogen, volume expands, so as to the 2nd F-P optical fiber
Microcavity (11) applies the stress of axial direction, changes fibre optic interferometer phase, causes optical fiber sensor head interference spectrum to move；First F-P light
Fine microcavity (10) no hydrogen sensitive membrane, microcavity effective length is constant, is provided " baseline " for experiment；Examined using spectroanalysis instrument (2)
The change for surveying interference wavelength can be obtained by the concentration of hydrogen.
The device can realize a kind of pass of the self-calibration device based on the double F-P verniers amplification hydrogen gas sensors of optical fiber microcavity
Key technology has：
The F-P optical fiber microcavity of a no hydrogen sensitive membrane in double F-P interference cavities is chosen as self-calibration device " double scale "
In " disjunction mark chi ", provide a series of datum lines for self-calibration technology, so as to obtain one stable " disjunction mark chi ", another plating
Have a silverskin, the F-P optical fiber microcavity of silver/palladium-based composite membrane is used as " vernier scale ", to be measured for sensing, can with movement to be measured, with
This solves the problems, such as drift；Double F-P interference structures that optical fiber microcavity is formed are make use of, it is different to have chosen two sections of equivalent cavity length
F-P optical fiber microcavitys, realize vernier enlarge-effect；With reference to the silver palladium alloy film with high stability, by multiple alternating sputtering, carry
The adhesion of high film and optical fiber sensor head, realize the high precision test to hydrogen.The fibre optical sensor developed according to this device
The advantages that big with sensing hydrogen range, selectivity is good, precision height, and the response time is short, reproducible, and resisting temperature is disturbed.
In a specific embodiment of the present utility model, the output wavelength of light source is 1200nm~1650nm；Spectrometer
Operation wavelength coverage is 1200nm~1650nm；Single-mode fiber is Standard single-mode fiber (G.625), core diameter
For 8.2 μm, cladding diameter is 125 μm, and multimode fibre is graded index multimode fiber, and core diameter is 62.5 μm, bag
A diameter of 125 μm of layer, hollow-core fiber is quartz capillary (TSP075150), and external diameter is 150 μm, and internal diameter is 75 μm, coating
For 12 μm；The length of hollow-core fiber and multimode fibre is respectively 200 μm and 215 μm, and length difference is 15 μm；Silver film thickness is 5nm,
Silver/palladium-based composite membrane thickness is 30nm (ratio of silver and palladium is about 1: 3), in density of hydrogen in the range of 0% to 1.6%, is based on
The sensitivity of the double F-P verniers amplification hydrogen gas sensors of optical fiber microcavity is 20nm/%.
The utility model is disclosed by examples detailed above, but other are to based on the double F-P verniers amplifications of optical fiber microcavity
The simple deformation of the self-calibration device of hydrogen gas sensor, replacement will be fallen into right of the present utility model.
Claims (1)
- A kind of 1. self-calibration device based on the double F-P verniers amplification hydrogen gas sensors of optical fiber microcavity, by wideband light source (1), spectrum Analyzer (2), three-dB coupler (3), single-mode fiber (4), double F-P hydrogen sensing modules (5) composition, it is characterised in that：Double F-P Hydrogen sensing module (5) is formed by hollow-core fiber (6), multimode fibre (7) welding；Wherein hollow-core fiber (6) forms the first F-P light Fine microcavity (10)；Multimode fibre (7) forms the 2nd F-P optical fiber microcavity (11), and outer surface is coated with silverskin (8), silver/palladium-based composite membrane (9)；Two ports of three-dB coupler (3) side are connected with wideband light source (1), spectroanalysis instrument (2) respectively, three-dB coupler (3) port of opposite side is connected by single-mode fiber (4) with double F-P hydrogen sensing modules (5)；Spectroanalysis instrument (2) is as letter Number demodulation part；Hollow-core fiber (6), the length difference of multimode fibre (7) are 5 μm~50 μm, the thickness of silverskin (8) should be 2nm~ 10nm, the thickness of silver/palladium-based composite membrane (9) should be 10nm~40nm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108717042A (en) * | 2018-05-28 | 2018-10-30 | 北京航空航天大学 | A kind of partially reflective density of hydrogen detection device of all risk insurance |
| CN108844921A (en) * | 2018-09-12 | 2018-11-20 | 中国计量大学 | Sensor based on hydrogen in MZ interference inclined optical fiber grating measuring transformer |
| CN109164050A (en) * | 2018-09-27 | 2019-01-08 | 电子科技大学 | The super sensitive gas sensor of Fabry-perot optical fiber based on tungsten selenide thin film channel structure |
| CN109632715A (en) * | 2019-01-25 | 2019-04-16 | 东北大学 | A kind of gas sensing probe based on triangle microcavity two-way F-P interference compensation |
| CN114034666A (en) * | 2021-11-08 | 2022-02-11 | 中国计量大学 | Self-packaging interference type optical fiber hydrogen sensor based on C-shaped ceramic sleeve |
| NL2029909B1 (en) * | 2021-11-25 | 2023-06-15 | Univ Jiliang China | SELF-ENCAPSULATED OPTICAL FIBER FABRY-PEROT INTERFEROMETER TYPE HYDROGEN SENSOR BASED ON Pd/Ag ALLOY FILM |
| NL2032418A (en) * | 2022-01-14 | 2023-07-21 | Zhuhai Must Science And Tech Research Institute | Probe-type hydrogen concentration sensor for f-p interferometers based on hollow-core fibers |
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2017
- 2017-04-21 CN CN201720436647.8U patent/CN207051192U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108717042A (en) * | 2018-05-28 | 2018-10-30 | 北京航空航天大学 | A kind of partially reflective density of hydrogen detection device of all risk insurance |
| CN108717042B (en) * | 2018-05-28 | 2020-08-21 | 北京航空航天大学 | Full polarization-preserving reflection type hydrogen concentration detection device |
| CN108844921A (en) * | 2018-09-12 | 2018-11-20 | 中国计量大学 | Sensor based on hydrogen in MZ interference inclined optical fiber grating measuring transformer |
| CN108844921B (en) * | 2018-09-12 | 2024-02-06 | 中国计量大学 | Sensor for measuring hydrogen in transformer based on MZ interference inclined fiber bragg grating |
| CN109164050A (en) * | 2018-09-27 | 2019-01-08 | 电子科技大学 | The super sensitive gas sensor of Fabry-perot optical fiber based on tungsten selenide thin film channel structure |
| CN109632715A (en) * | 2019-01-25 | 2019-04-16 | 东北大学 | A kind of gas sensing probe based on triangle microcavity two-way F-P interference compensation |
| CN109632715B (en) * | 2019-01-25 | 2020-03-24 | 东北大学 | Gas sensing probe based on triangular microcavity double-path F-P interference compensation |
| CN114034666A (en) * | 2021-11-08 | 2022-02-11 | 中国计量大学 | Self-packaging interference type optical fiber hydrogen sensor based on C-shaped ceramic sleeve |
| NL2029909B1 (en) * | 2021-11-25 | 2023-06-15 | Univ Jiliang China | SELF-ENCAPSULATED OPTICAL FIBER FABRY-PEROT INTERFEROMETER TYPE HYDROGEN SENSOR BASED ON Pd/Ag ALLOY FILM |
| NL2032418A (en) * | 2022-01-14 | 2023-07-21 | Zhuhai Must Science And Tech Research Institute | Probe-type hydrogen concentration sensor for f-p interferometers based on hollow-core fibers |
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