CN205426774U - Protect inclined to one side photonic crystal optic fibre hydrogen sensor based on polarized light is interfered - Google Patents
Protect inclined to one side photonic crystal optic fibre hydrogen sensor based on polarized light is interfered Download PDFInfo
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- CN205426774U CN205426774U CN201620247260.3U CN201620247260U CN205426774U CN 205426774 U CN205426774 U CN 205426774U CN 201620247260 U CN201620247260 U CN 201620247260U CN 205426774 U CN205426774 U CN 205426774U
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- hydrogen
- pcf
- polarization
- photonic crystal
- polarized light
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Abstract
The utility model discloses an is protect inclined to one side photonic crystal optic fibre hydrogen sensor based on polarized light is interfered by broadband light source, transmission fiber, polarization controller, PM PCF, the pdAg hydrogen sensitive membrane, two -dimentional optic fibre anchor clamps, the constant temperature air chamber, the spectrum appearance is constituteed. Does the light beam of broadband light source transmission pass through the PM that incides behind the polarization controller adjustment polarization state PCF, PM PCF's the slow axis outside is evenly sputtered the pdAg hydrogen sensitive membrane and has been covered the half of periphery. It is different to the influence that fast slow axis birefringence led to the fact that the coating film distribution of optic fibre surface results in the pdAg hydrogen sensitive membrane to inhale the hydrogen inflation along the axial asymmetry, and the the polarization direction and the phase place of slow axis light change, and fast axis light state remains unchanged. Two transfer mode take place to interfere in transmission fiber, and spectrum is received by the spectrum appearance. The pdAg hydrogen sensitive membrane is very sensitive to hydrogen, consequently interferes spectrum drift volume can accurately reflect environment hydrogen concentration. This invents simple structure, and sensitivity is high, and temperature drift is little, provides the realistic plan for hydrogen concentration on -line monitoring.
Description
Technical field
The utility model belongs to optical fiber hydrogen field of sensing technologies, is specifically related to a kind of guarantor's polarisation based on polarized light interference
Photonic crystal fiber hydrogen gas sensor.
Background technology
Hydrogen (H2) energy density high, combustion product is nontoxic, is acknowledged as 21st century most development potentiality
Secondary energy sources.Under room temperature and standard atmosphere condition, the explosion ratio scope of hydrogen is very wide (4 % ~ 74.2 %), igniting
Minimum energy (0.02mJ), the security to hydrogen gas detector of the strong inflammable and explosive property, reliability and to super low concentration
The responding ability of hydrogen proposes high requirement.
Optical Hydrogen gas sensor, especially Optical Fider Hybrogen Sensor, use light as medium and carry out density of hydrogen sensing, by
There is not electric component in transducing part, there is essence explosion-proof, highly sensitive, to advantages such as electromagnetic interference immunity, draw in recent years
Rise and paid close attention to widely and study.Common grating type optical fiber hydrogen gas sensor, needs in extra temperature-compensating measure suppression
The temperature drift of cardiac wave length, there is also Temperature cross-over sensitive issue while accuracy of detection is the highest.
Polarization-maintaining photonic crystal fiber (PM-PCF) is the photonic crystal fiber with polarization property, by the light of fiber core
Sub-crystal structure combines stress rods and produces unified stress birfringence effect, it is possible to the polarization state keeping polarised light over long distances is same
Position, its good temperature characterisitic, be conducive to making temperature-resistant optical fibre device, can effectively simplify apparatus structure, improve
Device stability.
Summary of the invention
For the deficiencies in the prior art, the purpose of this utility model is to provide a kind of guarantor's polarisation based on polarized light interference
Photonic crystal fiber hydrogen gas sensor, by interfering the drift value reaction density of hydrogen of trough wavelength, this structure is easily achieved, sensitive
Degree height, temperature characterisitic is excellent, can effectively alleviate environmental temperature fluctuation and density of hydrogen detects the adverse effect brought.
The utility model is achieved through the following technical solutions: a kind of polarization-maintaining photonic crystal fiber hydrogen based on polarized light interference
Gas sensor, by wideband light source (1), Transmission Fibers (2), Polarization Controller (3), PM-PCF(4), Pd/Ag hydrogen sensitive film (5),
Two dimensional optical fiber fixture (6), constant temperature air chamber (7), spectrometer (8) forms；Wideband light source (1) is connected to by Transmission Fibers (2) partially
Shake controller (3), and Polarization Controller (3) passes through Transmission Fibers (2) and PM-PCF(4) left end is connected, PM-PCF(4) right-hand member passes through
Transmission Fibers (2) is connected with spectrometer (8)；Wherein, PM-PCF(4) slow axis outside uniform sputter Pd/Ag hydrogen sensitive film (5) cover
/ 2nd composition hydrogen sensitive heads of lid periphery, two dimensional optical fiber fixture (6) is by PM-PCF(4) it is fixed on constant temperature air chamber (7) bottom.
Described PM-PCF(4) a length of 30mm ~ 50mm, Pd/Ag hydrogen sensitive film (5) a length of 20mm of plated film ~
30mm, thickness be 40nm ~ 50nm, Ag mass fraction be 20% ~ 40%.
Described PM-PCF(4) the preferred model of polarization-maintaining photonic crystal fiber selected is PM-1550-01, operation wavelength
At 1550nm.
Operation principle of the present utility model is: wideband light source (1) launches the light beam of wavelength 1500nm ~ 1600nm, by partially
Along the incident PM-PCF of Transmission Fibers (2) after the controller (3) that shakes adjustment polarization state.Due to PM-PCF(4) slow axis outside uniformly spatter
Penetrating Pd/Ag hydrogen sensitive film (5) and cover 1/2nd of periphery, the distribution of cladding surface plated film is the most asymmetric, at Pd/Ag hydrogen
After sensitive membrane (5) absorbs hydrogen generation volumetric expansion, in extruding covering, the birefringence effect of fast axle, slow axis can be produced by airport
Different Effects.After being modulated, polarization direction and the phase place of slow axial light change, and fast axial light state keeps constant, two transmission
Phase difference occurs between pattern and interferes in Transmission Fibers (2), interference signal along Transmission Fibers (2) by spectrometer (8)
Receive.It follows that the drift value of interference spectrum is extruded PM-PCF(4 by Pd/Ag hydrogen sensitive film (5)) phase difference that introduces is certainly
Fixed, and Pd/Ag hydrogen sensitive film (5) is very sensitive to hydrogen, therefore, it is possible to realize the high-precision sensing to environment density of hydrogen.
Phase difference between fast axial light and slow axial lightBy the extruding of PM-PCF self and Pd/Ag hydrogen sensitive film (5) simultaneously
Determine, can be expressed as
(1)
In formula, integer m is order of interference,It is m level trough wavelength,、It is respectively the intrinsic birefringence of PM-PCF
And fiber lengths；、It is respectively additional birefringence and the length of coating film area that Pd/Ag hydrogen sensitive film (5) introduces.
Pd is owing to absorbing H2Molecular grating volume expands, and in extruding covering, airport causes the birefringence of slow axis to change
Become, the phase difference between two transmission modesBecome
(2)
By (1) formula and (2) Shi Ke get, m level interferes trough drift valueFor
(3)
Additional birefringence variable quantityDetermine m level and interfere trough drift value, and Pd/Ag hydrogen sensitive film (5) is to hydrogen
Gas is very sensitive, therefore, it is possible to realize the high-precision sensing of density of hydrogen.
The beneficial effects of the utility model are: (1) selects the PM-PCF that temperature characterisitic is excellent to make temperature-resistant
Optical Fider Hybrogen Sensor, it is not necessary to temperature-compensating link, effectively simplifies apparatus structure, saves cost of manufacture；(2) Ag can effectively suppress
Pd combines what H atom occurredPhase transformation, stable metal lattice structure, alleviate the foaming of Pd coating surface, fault phenomenon, improve hydrogen
Sensitive membrane mechanical performance, extension fixture service life；Therefore, the utility model has simple in construction, highly sensitive, can alleviate temperature
Degree fluctuation, on advantages such as the impacts that density of hydrogen detection brings, provides a kind of practicable side for density of hydrogen on-line monitoring
Case.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of a kind of polarization-maintaining photonic crystal fiber hydrogen gas sensor based on polarized light interference.
Fig. 2 is the cross section of hydrogen sensitive head in a kind of polarization-maintaining photonic crystal fiber hydrogen gas sensor based on polarized light interference
Schematic diagram.
Detailed description of the invention
With detailed description of the invention, the utility model is described in further detail below in conjunction with the accompanying drawings.
See accompanying drawing 1, a kind of polarization-maintaining photonic crystal fiber hydrogen gas sensor based on polarized light interference, it is characterised in that:
By wideband light source (1), Transmission Fibers (2), Polarization Controller (3), PM-PCF(4), Pd/Ag hydrogen sensitive film (5), two dimensional optical fiber is pressed from both sides
Tool (6), constant temperature air chamber (7), spectrometer (8) forms；Wideband light source (1) is connected to Polarization Controller by Transmission Fibers (2)
(3), Polarization Controller (3) passes through Transmission Fibers (2) and PM-PCF(4) left end is connected, PM-PCF(4) right-hand member passes through Transmission Fibers
(2) it is connected with spectrometer (8)；Two dimensional optical fiber fixture (6) is by PM-PCF(4) it is fixed on constant temperature air chamber (7) bottom；Hydrogen sensitive head is horizontal
Cross section sees accompanying drawing 2, PM-PCF(4) slow axis outside uniform sputter Pd/Ag hydrogen sensitive film (5) cover periphery 1/2nd,
PM-PCF(4) a length of 40mm, the thickness of a length of 30mm, Pd/Ag hydrogen sensitive film (5) of coating film area is 40nm, Ag's
Mass fraction is 25%, PM-PCF(4) it is the polarization-maintaining photonic crystal fiber of PM-1550-01 model.
Transmission Fibers (2) utilizes single-mode fiber to be made, Transmission Fibers (2) and PM-PCF(4) between use optical fiber welding
The standardization program that picks welding, the optical fiber splicer model of employing is Fujikura 60s.Two dimensional optical fiber fixture (6) maintains PM-PCF
(4) level is exceptionally straight, in order to avoid Pd/Ag hydrogen sensitive film (5) is because fibre-optical bending comes off and keeps PM-PCF(4) intrinsic birefringence perseverance
Fixed.Constant temperature air chamber (7) interior temperature is maintained at 25 degrees Celsius.
Operation principle of the present utility model is: wideband light source (1) launches the light beam of wavelength 1500nm ~ 1600nm, by partially
Along the incident PM-PCF of Transmission Fibers (2) after the controller (3) that shakes adjustment polarization state.Due to PM-PCF(4) slow axis outside uniformly spatter
Penetrating Pd/Ag hydrogen sensitive film (5) and cover 1/2nd of periphery, the distribution of cladding surface plated film is the most asymmetric, at Pd/Ag hydrogen
After sensitive membrane (5) absorbs hydrogen generation volumetric expansion, in extruding covering, the birefringence effect of fast axle, slow axis can be produced by airport
Different Effects.After being modulated, polarization direction and the phase place of slow axial light change, and fast axial light state keeps constant, two transmission
Phase difference occurs between pattern and interferes in Transmission Fibers (2), interference signal along Transmission Fibers (2) by spectrometer (8)
Receive.It follows that the drift value of interference spectrum is extruded PM-PCF(4 by Pd/Ag hydrogen sensitive film (5)) phase difference that introduces is certainly
Fixed, and Pd/Ag hydrogen sensitive film (5) is very sensitive to hydrogen, therefore, it is possible to realize the high-precision sensing to environment density of hydrogen.
Claims (3)
1. a polarization-maintaining photonic crystal fiber hydrogen gas sensor based on polarized light interference, it is characterised in that: by wideband light source
(1), Transmission Fibers (2), Polarization Controller (3), PM-PCF(4), Pd/Ag hydrogen sensitive film (5), two dimensional optical fiber fixture (6), constant temperature
Air chamber (7), spectrometer (8) forms；Wideband light source (1) is connected to Polarization Controller (3), Polarization Control by Transmission Fibers (2)
Device (3) passes through Transmission Fibers (2) and PM-PCF(4) left end is connected, PM-PCF(4) right-hand member passes through Transmission Fibers (2) and spectrometer
(8) it is connected；Wherein, PM-PCF(4) slow axis outside uniform sputter Pd/Ag hydrogen sensitive film (5) cover this PM-PCF(4) periphery
1/2nd constitute hydrogen sensitive head, and two dimensional optical fiber fixture (6) is by PM-PCF(4) it is fixed on constant temperature air chamber (7) bottom.
A kind of polarization-maintaining photonic crystal fiber hydrogen gas sensor based on polarized light interference the most according to claim 1, it is special
Levy and be: described PM-PCF(4) a length of 30mm ~ 50mm, Pd/Ag hydrogen sensitive film (5) a length of 20mm of plated film ~
30mm, thickness be 40nm ~ 50nm, Ag mass fraction be 20% ~ 40%.
A kind of polarization-maintaining photonic crystal fiber hydrogen gas sensor based on polarized light interference the most according to claim 1, it is special
Levy and be: described PM-PCF(4) the preferred model of polarization-maintaining photonic crystal fiber selected is PM-1550-01, operation wavelength exists
1550nm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620247260.3U CN205426774U (en) | 2016-03-29 | 2016-03-29 | Protect inclined to one side photonic crystal optic fibre hydrogen sensor based on polarized light is interfered |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620247260.3U CN205426774U (en) | 2016-03-29 | 2016-03-29 | Protect inclined to one side photonic crystal optic fibre hydrogen sensor based on polarized light is interfered |
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| Publication Number | Publication Date |
|---|---|
| CN205426774U true CN205426774U (en) | 2016-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620247260.3U Withdrawn - After Issue CN205426774U (en) | 2016-03-29 | 2016-03-29 | Protect inclined to one side photonic crystal optic fibre hydrogen sensor based on polarized light is interfered |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606536A (en) * | 2016-03-29 | 2016-05-25 | 中国计量学院 | Polarization-maintaining photonic crystal fiber hydrogen sensor based on polarized light interferences |
-
2016
- 2016-03-29 CN CN201620247260.3U patent/CN205426774U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606536A (en) * | 2016-03-29 | 2016-05-25 | 中国计量学院 | Polarization-maintaining photonic crystal fiber hydrogen sensor based on polarized light interferences |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Hangzhou City, Zhejiang province 310018 Xiasha Higher Education Park source Street No. 258 Patentee after: CHINA JILIANG UNIVERSITY Address before: Hangzhou City, Zhejiang province 310018 Xiasha Higher Education Park source Street No. 258 Patentee before: China Jiliang University |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160803 Effective date of abandoning: 20180427 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160803 Effective date of abandoning: 20180427 |