CN206710289U - A kind of hydrogen gas sensor based on F P interferometers non-sensitive to temperature - Google Patents
A kind of hydrogen gas sensor based on F P interferometers non-sensitive to temperature Download PDFInfo
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- CN206710289U CN206710289U CN201720603908.0U CN201720603908U CN206710289U CN 206710289 U CN206710289 U CN 206710289U CN 201720603908 U CN201720603908 U CN 201720603908U CN 206710289 U CN206710289 U CN 206710289U
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- interferometers
- hydrogen gas
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- temperature
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Abstract
The utility model discloses a kind of hydrogen gas sensor based on F P interferometers non-sensitive to temperature, including wideband light source, circulator, spectrometer and F P interferometers, it is characterised in that：Described F P interferometers are made up of single-mode fiber, hollow-core fiber and single-mode fiber successively welding, wherein, special air chamber is formed by hollow-core fiber through discharge process twice, the side coating of the air chamber is Pd catalyst fineses, so as to form the hydrogen gas sensor based on F P interferometers non-sensitive to temperature；The left end of the sensor and one end of circulator are connected, and wideband light source, spectrometer are connected with the other both ends of circulator respectively.The utility model has compact-sized, small volume, easy making, cost is low and is not influenceed by variation of ambient temperature, can be applied to the measurement of density of hydrogen.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, and in particular to a kind of non-sensitive to temperature based on F-P interference
The hydrogen gas sensor of instrument.
Background technology
Hydrogen is a kind of fuel of high effect cleaning, and having potentially can the energy that utilizes of Infinite Cyclic.But hydrogen molecule
Volume it is very small, easily leak.Hydrogen in Air concentration runs into naked light i.e. explosibility in 4%-75%, thus transport,
During storage, use, it is a very necessary security work that monitoring in real time is carried out to environment density of hydrogen.Develop
The hydrogen gas sensor based on electrical characteristics operation principle gone out, is also easy to produce electric spark during use, have set off an explosion can
Can property.Compared with traditional hydrogen gas sensor, Optical Fider Hybrogen Sensor is detected by optical signal, has essential explosion-proof, body
The advantages that long-pending small, in light weight, corrosion-resistant, electromagnetism interference, high high sensitivity and precision.Optical fiber hydrogen sensing technology just receives
Extensive concern.There are several different types of Optical Fider Hybrogen Sensors at present, sensed including interference-type optical fiber hydrogen
It is device, disappearance wave mode Optical Fider Hybrogen Sensor, surface plasma body resonant vibration type hydrogen gas sensor, FBG types Optical Fider Hybrogen Sensor, micro-
Lensed fiber hydrogen gas sensor.Although the reason for every kind of optical-fiber type hydrogen gas sensor is with the presence of its, but each deposit
Inevitable the shortcomings that, for example, the change of interference-type optical fiber hydrogen gas sensor external environment can cause to do to the measurement of hydrogen
Disturb, disappearance wave mode Optical Fider Hybrogen Sensor is only suitable for detecting low-concentration hydrogen concentration range, surface plasma body resonant vibration type optical fiber
Hydrogen gas sensor Pd/WO3Although cosputtering sensitive membrane can absorb very wide density of hydrogen scope, its response time is slow, no
Alarm function can be played, hytrogen sensitive film is due to caused understressing after absorption hydrogen in FBG type Optical Fider Hybrogen Sensors
Differ stretching optical fiber surely, so as to which the Bragg wavelength of grating can not be changed or variable quantity is very small to distinguish, and FBG hydrogen
Gas sensor needs more complicated technology and expensive optical fibre device to carry out the detection of wavelength shift, while also needs to high-power
Wideband light source or Wavelength tunable light source, therefore detect resolution ratio and dynamic range can be this by a definite limitation, use
The cost of sensor also can be very high.
The content of the invention
In order to solve above-mentioned the deficiencies in the prior art, the utility model provides a kind of non-sensitive to temperature done based on F-P
The hydrogen gas sensor of interferometer, only need to be by hollow by single-mode fiber, hollow-core fiber and single-mode fiber successively welding, special air chamber
Optical fiber is formed through discharge process twice, then applies Pd catalyst fineses in the side of air chamber, is had and is prepared convenient, knot
The advantages that structure is simple, small volume, light weight, cost are low and is not influenceed by variation of ambient temperature.
Technical scheme used by the utility model：A kind of hydrogen sensing based on F-P interferometers non-sensitive to temperature
Device, including wideband light source, spectrometer, circulator and F-P interferometers, it is characterised in that：Described F-P interferometers are by single-mode optics
Fine, hollow-core fiber and single-mode fiber successively welding and form, wherein, the special air chambers of a length of 100-120 microns of chamber be by
Hollow-core fiber is formed through discharge process twice, and the side coating of the air chamber is that the Pd that thickness is 20-30 microns is catalyzed
Agent powder, so as to form the hydrogen gas sensor based on F-P interferometers non-sensitive to temperature；The left end and circulator of the sensor
One end connection, wideband light source, spectrometer are connected with the other both ends of circulator respectively.
The beneficial effects of the utility model are：
1. sensor integral material is optical fiber, there is electromagnetism interference, anticorrosive, essential safety, stability are strong, small volume
And the advantages that light weight.
2. optical fiber need to only be discharged using general commercial optical fiber splicer in the preparation process of the sensor, weld
The work such as reason and coating powder, has the advantages of simple in construction and easy preparation.
3. the sensor for temperature sensitivity is very low, so the use that the change of ambient temperature senses to the hydrogen
Do not influence, it is not necessary to which cascade fiber grating compensates to environment temperature.
4. the operation principle of hydrogen gas sensor described in is：Pd powder, which meets hydrogen, can occur following chemical reaction：
H2+Pd→PdHx (1)
The reaction can generate PdHx, and Pd powder inhale hydrogen after can produce transformation from a phases to β phases, can now produce expansion
Effect, so as to which F-P cavity elongates its air chamber due to being produced stress by bulking effect, optical path difference can also change therewith
Become, therefore as red shift can occur for the interference spectrum detected by the increase spectrometer of density of hydrogen, so we can pass through inspection
Survey interference spectrum drift value can Accurate Determining hydrogen to be measured concentration.
Brief description of the drawings
Below in conjunction with the accompanying drawings and concrete mode the utility model is described in further detail.
Fig. 1 is the structural representation of the hydrogen gas sensor；
Fig. 2 is the test system schematic diagram of the hydrogen gas sensor；
In figure：1. single-mode fiber, 2.Pd catalyst fineses, 3. hollow-core fibers, 4.F-P air chambers, 5. wideband light sources, 6. rings
Shape device, 7. hydrogen gas sensors, 8. air chambers, 9. spectrometers.
Embodiment
In Fig. 1, a kind of described hydrogen gas sensor based on F-P interferometers non-sensitive to temperature, its preparation flow is：
By single-mode fiber and hollow-core fiber welding, its is endless to be ensured to hollow-core fiber progress discharge process at 120 microns from fusion point
Full avalanche, discharge process is then being carried out again away from fusion point 140-260 microns, can now form special air chamber i.e. F-P
Chamber, the hollow-core fiber collapsed completely is cut off, then in the right-hand member welding single-mode fiber of air chamber, finally in the side of air chamber
Coat Pd catalyst fineses.
As shown in Figure 2 by one end of the hydrogen gas sensor and circulator connect, wideband light source, spectrometer respectively with circulator
Other both ends connection, then sensor is placed in air chamber.When carrying out hydrogen sensing experiment, when the light that wideband light source is sent
It can be reflected when being propagated along fibre core in F-P cavity front and rear wall, this two beams reflected light, which can interact, to be interfered, when Pd films are inhaled
Chemical reaction can occur after hydrogen can generate PdHx, and Pd powder is inhaled the transformation volume that can be produced from a phases to β phases after hydrogen and can expanded,
So as to which F-P cavity elongates its air chamber due to being produced stress by bulking effect, optical path difference can also change therewith, two
Light beam is overlapped mutually caused interference spectrum and can drifted about with the change of density of hydrogen, and spectrometer records hydrogen sensing in real time
The interference spectrum of device, i.e., we can be by detecting the drift value of interference spectrum so that it is determined that density of hydrogen size.The sensor and one
As hydrogen gas sensor compare have it is simple in construction, easy prepare, cost is low, small volume, light weight and not by variation of ambient temperature
The advantages that influence.
Claims (2)
1. a kind of hydrogen gas sensor based on F-P interferometers non-sensitive to temperature, including wideband light source, spectrometer, circulator
With F-P interferometers, it is characterised in that：Described F-P interferometers are by single-mode fiber, hollow-core fiber and single-mode fiber successively welding
And form, wherein, special air chamber is formed by hollow-core fiber through discharge process twice, the side coating of the air chamber
Be Pd catalyst fineses, so as to form the hydrogen gas sensor based on F-P interferometers non-sensitive to temperature；A left side for the sensor
End is connected with one end of circulator, and wideband light source, spectrometer are connected with the other both ends of circulator respectively.
2. a kind of hydrogen gas sensor based on F-P interferometers non-sensitive to temperature according to claim 1, its feature exist
In：The a length of 100-120 microns of chamber of described air chamber, the thickness of the Pd catalyst fineses of its side coating is 20-30 microns.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720603908.0U CN206710289U (en) | 2017-05-24 | 2017-05-24 | A kind of hydrogen gas sensor based on F P interferometers non-sensitive to temperature |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720603908.0U CN206710289U (en) | 2017-05-24 | 2017-05-24 | A kind of hydrogen gas sensor based on F P interferometers non-sensitive to temperature |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110068551A (en) * | 2019-06-04 | 2019-07-30 | 中国计量大学 | A kind of symmetrical cascade structured optical fiber SPR detector |
| CN110441265A (en) * | 2019-07-31 | 2019-11-12 | 武汉理工大学 | Based on the optical fiber carbon monoxide detection system of carbon monoxide sensitive material and its application |
| CN114414485A (en) * | 2022-01-19 | 2022-04-29 | 浙江树人学院（浙江树人大学） | Hydrogen detector based on elastic optical fiber |
-
2017
- 2017-05-24 CN CN201720603908.0U patent/CN206710289U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110068551A (en) * | 2019-06-04 | 2019-07-30 | 中国计量大学 | A kind of symmetrical cascade structured optical fiber SPR detector |
| CN110441265A (en) * | 2019-07-31 | 2019-11-12 | 武汉理工大学 | Based on the optical fiber carbon monoxide detection system of carbon monoxide sensitive material and its application |
| CN114414485A (en) * | 2022-01-19 | 2022-04-29 | 浙江树人学院（浙江树人大学） | Hydrogen detector based on elastic optical fiber |
| CN114414485B (en) * | 2022-01-19 | 2023-12-05 | 浙江树人学院（浙江树人大学） | Hydrogen detector based on elastic optical fiber |
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| 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: 20171205 Termination date: 20180524 |