CN208860739U - Sensor based on hydrogen in MZ interference inclined optical fiber grating measuring transformer - Google Patents
Sensor based on hydrogen in MZ interference inclined optical fiber grating measuring transformer Download PDFInfo
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- CN208860739U CN208860739U CN201821493283.8U CN201821493283U CN208860739U CN 208860739 U CN208860739 U CN 208860739U CN 201821493283 U CN201821493283 U CN 201821493283U CN 208860739 U CN208860739 U CN 208860739U
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Abstract
The utility model discloses a kind of sensors based on hydrogen in MZ interference inclined optical fiber grating measuring transformer, by wideband light source, polarization controller, first single mode optical fiber, first optical fiber dislocation welding structure, the second single mode optical fiber, inclined optical fiber grating, gold thin film, palladium membranes, hydrophobic oleophobic coating, the second optical fiber dislocation welding structure, third single mode optical fiber, fiber spectrometer composition.When the incident light that wideband light source issues enters inclined optical fiber grating by polarization controller polarization for P-polarized light, most incident lights are coupled as the cladding mode of reverse transfers.Since inclined optical fiber grating cladding surface is coated with the gold thin film of 50nm thickness, when the palladium membranes being plated in gold thin film absorbs hydrogen, acutely expansion occurs for volume, causes dielectric layer refractive index to change, and then meet the cladding mode of phase-matching conditionλ cl It changes, the wave length shift occurred by transmission peaks in measurement transmission spectrum can accurately measure density of hydrogen.
Description
Technical field
The utility model belongs to optical fiber hydrogen field of sensing technologies, and in particular to one kind interferes inclined optical fiber grating based on MZ
The sensor of hydrogen in measuring transformer.
Background technique
Hydrogen is that a kind of common active gas is easily ignited when the hydrogen content in air is in 4%~74.4%
With generation heavy explosion.If a failure occurs when electric equipment operation, internal stainless steel structure is easy to react with insulating oil, produces
Raw a large amount of exceeded hydrogen, are easy to cause safety accident.Therefore, safe and reliable, highly sensitive hydrogen gas sensor has important
Researching value.Fiber parametric amplification essence is explosion-proof, has strong anti-interference ability, and is the main research side of hydrogen gas sensor
To.
Surface plasma resonance (Surface Plasmon Resonance, SPR) sensing technology is a kind of photoelectric sensing skill
Art, sensitivity can reach 10-6RIU(Refractive Index Unit).Optical fiber sensing device is small in size, and structure is more
Sample is suitble to remote multi-point measurement, and spr signal is not easily susceptible to the interference of the extraneous factors such as mechanical structure, temperature, humidity.But
The complex manufacturing technology of optical fiber sensing device, signal response intensity is limited, the influence vulnerable to system self-noise.
Tilted fiber Bragg grating (Tilted Fiber Bragg Grating, TFBG) is a kind of fiber grating,
Lattice structure is similar to fiber bragg grating, but the wave vector direction of grating and the axial direction of optical fiber form an angle.Inclination
Incident light can not only be coupled as the core mode of reverse transfers by fiber bragg grating, can also be coupled as portion of incident light
The cladding mode of reverse transfers is with a wide range of applications in conjunction with SPR sensorgram technology.
Utility model content
In view of the deficiencies of the prior art, the purpose of this utility model is to provide one kind interferes inclined optical fiber grating based on MZ
Most of incident light is coupled as the cladding mode of reverse transfers by the sensor of hydrogen in measuring transformer, inclined optical fiber grating,
Meet the cladding mode of phase-matching condition in the Nano grade gold thin film and electricity sputtered on inclined optical fiber grating cladding surface
It is plated between the palladium membranes in gold thin film and surface plasma body resonant vibration occurs, form surface plasma wave.When palladium membranes absorbs
The expansion of volume is caused when the hydrogen dissolved in transformer insulation oil, is changed so as to cause its refractive index, and strong changes
Become phase-matching condition, and then changes the wavelength for cladding mode of most decaying.The mach zhender that two misconstructions are formed
Interference forms interference peaks in spectrum, then further improves measurement sensitivity, by the sensing device, can accurately monitor change
Density of hydrogen in depressor.
The utility model is achieved through the following technical solutions: by wideband light source (1), polarization controller (2), the first single-mode optics
Fine (3), the first optical fiber dislocation welding structure (4), the second single mode optical fiber (5), inclined optical fiber grating (6), gold thin film (7), palladium is thin
Film (8), hydrophobic oleophobic coating (9), the second optical fiber dislocation welding structure (10), third single mode optical fiber (11), fiber spectrometer
(12) it forms；Wherein the second single mode optical fiber (5) middle section fibre core is carved with inclined optical fiber grating (6), inclined optical fiber grating (6) grid
Area's cladding surface is coated with a floor gold thin film (7), and gold thin film (7) surface plates one layer of palladium membranes (8) again, and entire sensing arrangement all applies
It is covered with hydrophobic oleophobic coating (9)；Polarization controller (2) left end is connect with wideband light source (1), right end and the first single mode optical fiber (3)
Left end connection, the first single mode optical fiber (3) right end and the second single mode optical fiber (5) left end fibre core 3.5 microns of first optical fiber of formation of dislocation
Dislocation welding structure (4), the second single mode optical fiber (5) right end and third single mode optical fiber (11) left end fibre core misplace 3.5 microns and are formed
Second optical fiber dislocation welding structure (10), third single mode optical fiber (11) right end are connected to fiber spectrometer (12).
The first optical fiber dislocation welding structure (4) is that the first single mode optical fiber (3) right end and the second single mode optical fiber (5) are left
It holds fibre core to misplace 3.5 microns to be formed；Second optical fiber dislocation welding structure (9) is the second single mode optical fiber (5) right end and third single mode
Optical fiber (11) left end fibre core misplaces 3.5 microns and is formed.
The inclined optical fiber grating (5) is made by single mode optical fiber by phase-mask method, length 20mm, grating
Period is 556.6nm.
The gold thin film (7) is plated in inclined optical fiber grating (6) grid region covering table with a thickness of 50nm, using magnetron sputtering method
Face.
The palladium membranes (8) is plated in gold thin film (7) surface with a thickness of 200um, using magnetron sputtering method.
The hydrophobic oleophobic coating (9) is amino acrylic resin, SiO2Nanoparticle and silicon fluoride are compounded
Nano material is applied directly on sensing arrangement, and insulating oil is avoided to pollute sensor.
The working principle of the utility model is: the incident light that wideband light source (1) issues is by polarization controller (2) polarization
When P-polarized light enters inclined optical fiber grating (6), most incident lights are coupled as the cladding mode of reverse transfers.Due to inclining
Oblique fiber grating cladding surface is coated with the gold thin film (7) of 50nm thickness, meets the cladding mode λ of phase-matching conditionclIt can be thin in gold
Surface plasma resonance occurs for film surface, forms surface plasma wave.Due to cladding mode λclEnergy be converted into surface etc. from
Daughter wave, so transmission peaks can be will form on transmission spectrum.
Shown in phase-matching condition is specific as follows:
λcl=[neff.co (λcl)+neff.cl(λcl)])*Λg (1)
Wherein, neff.co(λcl) it be core mode in wavelength is λclUnder effective refractive index, neff.cl(λcl) it is cladding mode
It is λ in wavelengthclUnder effective refractive index, Λ g be inclined optical fiber grating (6) effective period.When the palladium being plated on gold thin film (7) is thin
When film (8) absorbs hydrogen, acutely expansion occurs for volume, causes dielectric layer refractive index to change, and then meet phase
Cladding mode λ with conditionclIt changes, the wave length shift occurred by transmission peaks in measurement transmission spectrum can accurately measure
Density of hydrogen out.When incident light passes through (4) misconstruction A, it is partially optically coupled into covering, by portion when misconstruction B (9)
Light splitting is coupled into fibre core, forms Mach and increases Dare interference, further enhances transducer sensitivity.
The beneficial effects of the utility model are: in the density of hydrogen of measuring transformer dissolved in insulating oil, the speed of response
It is not key, the differentiation rate of hydrogen is relatively low in transformer insulation oil, and response sensitivity is then mostly important factor.
The utility model measures variations in refractive index before and after the quick material palladium film of hydrogen inhales hydrogen by being coated with the inclined optical fiber grating of gold thin film,
The SPR effect of generation has high sensitivity；Dare interference is increased using the Mach that two misconstructions are formed simultaneously, further
Improve transducer sensitivity；The hydrophobic oleophobic coating of Nano grade then substantially increases sensor service life；This reality simultaneously
Understandable with new principle, structure is simple, and cleaning is durable, provides for the density of hydrogen in high-precision detection transformer a kind of practical
Feasible scheme.
Detailed description of the invention
Fig. 1 is the sensor signal based on hydrogen in MZ interference inclined optical fiber grating measuring transformer of the utility model
Figure.
Fig. 2 is the optical fiber sensing structure schematic diagram of the utility model.
Specific embodiment
Referring to attached drawing 1, one kind is existed based on hydrogen gas sensor in MZ interference inclined optical fiber grating measuring transformer oil, feature
In: by wideband light source (1), polarization controller (2), the first single mode optical fiber (3), the first optical fiber dislocation welding structure (4), second is single
Mode fiber (5), inclined optical fiber grating (6), gold thin film (7), palladium membranes (8), hydrophobic oleophobic coating (9), the dislocation of the second optical fiber are molten
Binding structure (10), third single mode optical fiber (11), fiber spectrometer (12) composition；Wherein the second single mode optical fiber (5) middle section is fine
Core is carved with inclined optical fiber grating (6), and inclined optical fiber grating (6) grid region cladding surface is coated with one layer of gold thin film (7), gold thin film (7)
Surface plates one layer of palladium membranes (8) again, and entire sensing arrangement is each coated with hydrophobic oleophobic coating (9)；Polarization controller (2) left end
It is connect with wideband light source (1), right end is connect with the first single mode optical fiber (3) left end, the first single mode optical fiber (3) right end and the second single mode
Optical fiber (5) left end fibre core misplaces 3.5 microns of first optical fiber dislocation welding structures (4) of formation, the second single mode optical fiber (5) right end and the
Three single mode optical fibers (11) left end fibre core, 3.5 microns of second optical fiber dislocation welding structures (10) of formation of dislocation, third single mode optical fiber
(11) right end is connected to fiber spectrometer (12)；Wideband light source (1) central wavelength selected in the utility model is 1550nm, the
One single mode optical fiber (3), the second single mode optical fiber (5) and third single mode optical fiber are that core diameter is 9 μm, and cladding diameter is 125 μm
Single mode optical fiber.The working principle of the utility model is: the incident light that wideband light source (1) issues passes through polarization controller (2) pole
When turning to P-polarized light and entering inclined optical fiber grating (5), most incident lights are coupled as the cladding mode of reverse transfers.By
It is coated with the gold thin film (7) of 50nm thickness in inclined optical fiber grating cladding surface, meets the cladding mode λ of phase-matching conditionclMeeting exists
Surface plasma resonance occurs for gold thin film surface, forms surface plasma wave.Due to cladding mode λclEnergy is converted into surface
Plasma wave, so transmission peaks can be will form on transmission spectrum.When the palladium membranes (8) being plated on gold thin film (7) absorbs hydrogen
When, acutely expansion occurs for volume, causes dielectric layer refractive index to change, and then meet the cladding mode of phase-matching condition
Formula λclIt changes, the wave length shift occurred by transmission peaks in measurement transmission spectrum can accurately measure density of hydrogen.It is incident
When light passes through (4) misconstruction A, it is partially optically coupled into covering, is optically coupled into fibre by part when misconstruction B (9)
Core forms Mach and increases Dare interference, further enhances transducer sensitivity.
Referring to attached drawing 2, inclined optical fiber grating (5) is made by single mode optical fiber by phase-mask method, length 20mm,
Screen periods are 556.6nm；Gold thin film (7) is plated in inclined optical fiber grating (6) grid region packet with a thickness of 50nm, using magnetron sputtering method
Layer surface；Palladium membranes (8) is plated in gold thin film (7) surface with a thickness of 200um, using magnetron sputtering method；Hydrophobic oleophobic coating (9) is
Amino acrylic resin, SiO2 nanoparticle and the compounded nano material of silicon fluoride, are applied directly on sensing arrangement, keep away
Exempt from insulating oil to pollute sensor.
Claims (5)
1. the sensor based on hydrogen in MZ interference inclined optical fiber grating measuring transformer, it is characterised in that: by wideband light source
(1), polarization controller (2), the first single mode optical fiber (3), the first optical fiber dislocation welding structure (4), the second single mode optical fiber (5) incline
Oblique fiber grating (6), gold thin film (7), palladium membranes (8), hydrophobic oleophobic coating (9), the second optical fiber dislocation welding structure (10), the
Three single mode optical fibers (11), fiber spectrometer (12) composition；Wherein the second single mode optical fiber (5) middle section fibre core is carved with inclination optical fiber
Grating (6), inclined optical fiber grating (6) grid region cladding surface are coated with one layer of gold thin film (7), and gold thin film (7) surface plates one layer again
Palladium membranes (8), entire sensing arrangement are each coated with hydrophobic oleophobic coating (9)；Polarization controller (2) left end and wideband light source (1)
Connection, right end are connect with the first single mode optical fiber (3) left end, and the first single mode optical fiber (3) right end and the second single mode optical fiber (5) left end are fine
Core 3.5 microns of first optical fiber dislocation welding structures (4) of formation of dislocation, the second single mode optical fiber (5) right end and third single mode optical fiber
(11) 3.5 microns of second optical fiber dislocation welding structures (10) of formation of left end fibre core dislocation, the connection of third single mode optical fiber (11) right end
Fiber spectrometer (12).
2. the sensor according to claim 1 based on hydrogen in MZ interference inclined optical fiber grating measuring transformer, special
Sign is: the inclined optical fiber grating (6) is made by single mode optical fiber by phase-mask method, length 20mm, grating
Period is 556.6nm.
3. the sensor according to claim 1 based on hydrogen in MZ interference inclined optical fiber grating measuring transformer, special
Sign is: the gold thin film (7) is plated in inclined optical fiber grating (6) grid region covering table with a thickness of 50nm, using magnetron sputtering method
Face.
4. the sensor according to claim 1 based on hydrogen in MZ interference inclined optical fiber grating measuring transformer, special
Sign is: the palladium membranes (8) is plated in gold thin film (7) surface with a thickness of 200um, using magnetron sputtering method.
5. the sensor according to claim 1 based on hydrogen in MZ interference inclined optical fiber grating measuring transformer, special
Sign is: the hydrophobic oleophobic coating (9) is amino acrylic resin, SiO2Nanoparticle and silicon fluoride is compounded receives
Rice material, is applied directly on sensing arrangement, insulating oil is avoided to pollute sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821493283.8U CN208860739U (en) | 2018-09-12 | 2018-09-12 | Sensor based on hydrogen in MZ interference inclined optical fiber grating measuring transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821493283.8U CN208860739U (en) | 2018-09-12 | 2018-09-12 | Sensor based on hydrogen in MZ interference inclined optical fiber grating measuring transformer |
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| Publication Number | Publication Date |
|---|---|
| CN208860739U true CN208860739U (en) | 2019-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2018
- 2018-09-12 CN CN201821493283.8U patent/CN208860739U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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