CN106767959A - A kind of Demodulation System for Fiber Optic Fabry-Perot Sensors - Google Patents
A kind of Demodulation System for Fiber Optic Fabry-Perot Sensors Download PDFInfo
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- CN106767959A CN106767959A CN201611218187.8A CN201611218187A CN106767959A CN 106767959 A CN106767959 A CN 106767959A CN 201611218187 A CN201611218187 A CN 201611218187A CN 106767959 A CN106767959 A CN 106767959A
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- fabry
- perot
- fiber optic
- fiber
- optical fiber
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- 239000000835 fiber Substances 0.000 title claims abstract description 42
- 239000013307 optical fiber Substances 0.000 claims abstract description 52
- 239000013078 crystal Substances 0.000 claims abstract description 34
- 230000001133 acceleration Effects 0.000 claims abstract description 8
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052738 indium Inorganic materials 0.000 claims description 6
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 15
- 230000003287 optical effect Effects 0.000 description 7
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/266—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light by interferometric means
Abstract
The present invention relates to a kind of Demodulation System for Fiber Optic Fabry-Perot Sensors, including fiber optic coupler, by the first optical fiber and the wideband light source that the fiber optic coupler is connected, the fine Fabry-Perot sensor being connected with the fiber optic coupler by the second optical fiber, the port of the 3rd optical fiber being connected with the fiber optic coupler is provided with fibre-optical splice, it is characterized in that：Also include collimation lens corresponding with the fibre-optical splice it is corresponding with the collimation lens and with control circuit connection electro-optic crystal convergent lens corresponding with electro-optic crystal single point detector corresponding with the convergent lens.The measurement of the physical quantitys such as power, acceleration, strain, vibration that the present invention can be used under HTHP, and demodulating system can obtain more accurate measurement result.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, and in particular to a kind of Demodulation System for Fiber Optic Fabry-Perot Sensors.The invention
The measurement of the physical quantitys such as the power, acceleration, strain, the vibration that can be used under HTHP.
Background technology
Optical fiber Fabry-Perot sensor is a kind of novel sensor, by making two high reflection film layers in optical fiber, forms one
, when light beam passes through this F-P cavity, there is the multiple-beam interference of transmission and reflection in the individual F-P microcavity with certain size, be reflected back
The interference signal for coming carries chamber change information long.So, when extraneous parameter changes, cause the generation long of F-P cavity chamber
Corresponding change, so that change interference signal, it is achieved that sensing.
Fibre-optical F-P sensor and fiber F-P demodulating system together determine the accuracy of detection and speed of fiber F-P sensor-based system
Degree, demodulating system is a very important part in fiber F-P sensor-based system.The optical parametric utilized according to demodulation mode is not
Together, the demodulation of optical fiber Fabry-Perot sensing can be largely classified into：Intensity demodulation and phase demodulating.This invention uses one kind to use
The phase demodulating method of computing cross-correlation.
" a kind of high-speed demodulating system of fiber F-P cavity sensor " disclosed in CN203642944U, including wideband light source, three
Fiber port circulator, dense wave division multiplexer, photodetector and acquisition process unit.The light that wideband light source sends passes through three
Fiber port circulator injection fibre F-P cavity sensor；The reflected light of fiber F-P cavity sensor is again via the optical fiber circulator
Injection dense wave division multiplexer；The broadband reflection light of injection is decomposed into three beams different wave length after being filtered through dense wave division multiplexer
Narrow band light；This three beams arrowband light wave injection light electric explorer, is entered after opto-electronic conversion and filter and amplification by acquisition process unit
Row high-speed sampling and data processing, are calculated the phase or change of cavity length amount of F-P cavity sensor to be measured.Which not only reduces skill
Art difficulty, significantly reduces system cost, additionally it is possible to realizes that the high speed of fiber F-P cavity sensor, high accuracy are demodulated, is particularly suitable for
Dynamic measurement, such as measurement of blast pressure.Undoubtedly, this is a kind of good try of art.
The content of the invention
It is an object of the invention to provide a kind of Demodulation System for Fiber Optic Fabry-Perot Sensors, the power that can be used under HTHP, plus
The measurement of the physical quantitys such as speed, strain, vibration, and demodulating system can obtain more accurate measurement result.
A kind of Demodulation System for Fiber Optic Fabry-Perot Sensors of the present invention, including fiber optic coupler, by the first light
The fine wideband light source being connected with the fiber optic coupler, the light being connected with the fiber optic coupler by the second optical fiber
Fine Fabry-Perot sensor, the port of the 3rd optical fiber being connected with the fiber optic coupler is provided with fibre-optical splice, it is characterized in that：
Also include that collimation lens corresponding with the fibre-optical splice is corresponding with the collimation lens and brilliant with the electric light that control circuit is connected
Body convergent lens corresponding with electro-optic crystal single point detector corresponding with the convergent lens.
Further, described optical fiber Fabry-Perot sensor is optical-fiber Fabry-Perot force sensor, Fabry-perot optical fiber strain sensor or light
Nanofarads P acceleration sensor.
Further, the collimation lens is single convex lens, biconvex lens, cemented doublet or air-spaced doublet.
Further, the electro-optic crystal is for slab construction and with the inclinations angle of 15 to 20 degree, its preceding surface and rear table
Face is coated with semi-transparent semi-reflecting film layer, and the preceding surface is connected with the voltage output end of the control power supply, the rear surface and institute
State the earth terminal connection of control power supply.
The single point detector is single-point indium gallium arsenic detector or single-point silicon detector.
The present invention has following beneficial effect：
A kind of electro-optic crystal of present invention application, electro-optic crystal can occur electrooptic effect, i.e. crystal under External Electrical Field
Refractive index will change and change with external electric field.By way of voltage change constantly changes crystal refractive index, arrival is set to demodulate system
The interfering beam of system occurs to reflect and transmits on crystal, when the refractive index of crystal reaches certain numerical value, the light of the reflected beams
Path difference is long with F-P cavity chamber equal, you can obtain very big light intensity signal with detector.Because this demodulating system uses Fabry-perot optical fiber
Sensor, realizes multi-angle, multidirectional measurement；Due to using collimated light path structure, it is possible to achieve light source wave-length coverage wide
Measurement；Due to utilizing electro-optic crystal, the measurement of size range wide can be realized by changing voltage；Due to being detected using single-point
Device, can improve certainty of measurement and speed.Sum it up, the invention can improve the demodulation essence of Fibre Optical Sensor demodulating system
Degree, speed and raising measurement range.
Brief description of the drawings
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is fiber optic coupler schematic diagram；
Fig. 3 is the schematic diagram that electro-optic crystal is connected with control circuit；
Fig. 4 is the structural representation of electro-optic crystal.
In figure：1- wideband light sources, 2- fiber optic couplers, 3- optical fiber Fabry-Perot sensors, 4- collimation lenses, 5-
Electro-optic crystal, 6- control circuits, 7- convergent lenses, 8- single point detectors；
The optical fiber of 21- first, the optical fiber of 22- second, the optical fiber of 23- the 3rd, 24- fibre-optical splices；
The preceding surfaces of 51-, surface after 52-；
61- voltage output ends, 62- earth terminals.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
Referring to a kind of Demodulation System for Fiber Optic Fabry-Perot Sensors shown in Fig. 1 to Fig. 4, including fiber optic coupler 2, pass through
The fine Fabry-Perot sensor 3 that first optical fiber 21 is connected with the fiber optic coupler, is connected with the fiber optic coupler
The port of the 3rd optical fiber 23 is provided with fibre-optical splice 24, and it also includes collimation lens 4 corresponding with the fibre-optical splice 24 and institute
State collimation lens correspondence and the convergent lens 7 corresponding with the electro-optic crystal of electro-optic crystal 5 with the control connection of circuit 6 and institute
State the corresponding single point detector 8 of convergent lens.
Described optical fiber Fabry-Perot sensor 3 is optical-fiber Fabry-Perot force sensor, Fabry-perot optical fiber strain sensor or Fabry-perot optical fiber
Acceleration transducer.Optical fiber Fabry-Perot sensor in different measurement requests, with various structures form, for example：Fabry-perot optical fiber
Force snesor, Fabry-perot optical fiber strain sensor, Fabry-perot optical fiber acceleration transducer etc..
The collimation lens 4 is single convex lens, biconvex lens, cemented doublet or air-spaced doublet.By fiber optic coupling
The hot spot of clutch outgoing is the circular Gaussian hot spot of diverging, it is necessary to collimation lens is translated into collimated light beam outgoing, and collimation is saturating
Mirror can have variform according to aberration requirement, such as：Single convex lens, biconvex lens, cemented doublet, air-spaced doublet etc..
The electro-optic crystal 5 is for slab construction and with the inclinations angle of 15 to 20 degree, its preceding surface 51 and rear surface 52
Semi-transparent semi-reflecting film layer is coated with, the preceding surface 51 is connected with the voltage output end 61 of the control power supply 6, the rear surface 52
Earth terminal 62 with the control power supply 6 is connected.Electro-optic crystal is used to match the optical path difference of optical fiber Fabry-Perot sensor.Fabry-perot optical fiber
Due to multiple-beam interference, change of cavity length determines the coherency states of reflected light to sensor, by electro-optic crystal inner refractive index
Consecutive variations, make the reflected beams optical path difference of electro-optic crystal also consecutive variations.
The single point detector 8 is single-point indium gallium arsenic detector or single-point silicon detector.Single point detector is used to receive meeting
Convergent pencil of rays, according to demodulation speed and required precision, from single-point indium gallium arsenic detector or single-point silicon detector.
Embodiment-, the selection optical-fiber Fabry-Perot force sensor of optical fiber Fabry-Perot sensor 3, the selection biconvex lens of collimation lens 4 is single
Point probe 8 selects single-point indium gallium arsenic detector.
Embodiment two, the selection Fabry-perot optical fiber strain sensor of optical fiber Fabry-Perot sensor 3, collimation lens 4 selects double glued saturating
Mirror, the selection single-point silicon detector of single point detector 8.
Embodiment three, the selection Fabry-perot optical fiber acceleration transducer of optical fiber Fabry-Perot sensor 3, collimation lens 4 selects double separation
Lens, the selection single-point indium gallium arsenic detector of single point detector 8.
Can also be constituted another according to different requirement selection optical fiber Fabry-Perot sensors 3, collimation lens 4 and single point detector 8
Outer multiple specific embodiments.
The light beam that wideband light source of the invention 1 sends enters through the first optical fiber 21, fiber optic coupler 2, the second optical fiber 22
Optical fiber Fabry-Perot sensor 3 is incident upon, by the carrying Fa-Po cavity sensor of the end face reflection of the Fa-Po cavity of the optical fiber Fabry-Perot sensor
The optical signal of chamber long message is transmitted to the 3rd optical fiber 23 along the second optical fiber 22, fiber optic coupler 2, and by the end of the 3rd optical fiber 23
Fibre-optical splice 24 on mouth is incident to collimation lens 4；Collimation lens 4 makes light beam exiting parallel to electro-optic crystal 5, electro-optic crystal
Inclination angle with 15 to 20 degree, and controlled by control circuit 6；Collimated light beam after collimated lens 4 are collimated reaches electric light
The preceding surface 51 of crystal, the refractive index inside electro-optic crystal 5 changes with the change of the control output voltage of circuit 6；Directional light
There is multiple-beam interference in beam, on the preceding surface 51 of electro-optic crystal and rear surface 52 because collimated light beam is per se with Fabry-Perot sensor
Chamber long message, so when the inner refractive index of electro-optic crystal 5 changes, light beam reflects and enters electric light on the surface of electro-optic crystal
The two beam coherent light optical path differences that crystals are reflected again meet certain condition, can be obtained on single point detector greatly
Intensity signal.Finally, the concentrated lens 7 of coherent light for being reflected by electro-optic crystal are received after assembling by single point detector 8.
In the presence of circuit is controlled, different voltage causes electro-optic crystal refraction index changing to electro-optic crystal of the invention,
The optical path difference that the Fa-Po cavity of optical fiber Fabry-Perot sensor is produced is matched, the change of cavity length letter of Fa-Po cavity is obtained on single-point simple detector
Breath, finally gives the physical quantity information of measurand.The present invention can apply power at high temperature under high pressure, acceleration, strain, shakes
The measurement of the physical quantity such as dynamic, and accurate measurement result can be obtained.
Claims (5)
1. a kind of Demodulation System for Fiber Optic Fabry-Perot Sensors, including fiber optic coupler (2), by the first optical fiber (21) with it is described
The wideband light source (1) of fiber optic coupler connection, the light being connected with the fiber optic coupler by the second optical fiber (22)
Fine Fabry-Perot sensor (3), the port of the 3rd optical fiber (23) being connected with the fiber optic coupler is provided with fibre-optical splice
(24), it is characterized in that：Also include collimation lens (4) corresponding with the fibre-optical splice (24) with the collimation lens it is corresponding simultaneously
Electro-optic crystal (5) convergent lens (7) corresponding with the electro-optic crystal connected with control circuit (6) and the convergent lens
Corresponding single point detector (8).
2. Demodulation System for Fiber Optic Fabry-Perot Sensors according to claim 1, it is characterized in that：Described optical fiber Fabry-Perot sensor
(3) be optical-fiber Fabry-Perot force sensor, Fabry-perot optical fiber strain sensor or Fabry-perot optical fiber acceleration transducer.
3. Demodulation System for Fiber Optic Fabry-Perot Sensors according to claim 1, it is characterized in that：The collimation lens (4) is list
Convex lens, biconvex lens, cemented doublet or air-spaced doublet.
4. Demodulation System for Fiber Optic Fabry-Perot Sensors according to claim 1, it is characterized in that：The electro-optic crystal (5) is flat
Hardened structure and with 15 to 20 degree inclinations angle, its preceding surface (51) and rear surface (52) are coated with semi-transparent semi-reflecting film layer, institute
State preceding surface (51) to be connected with the voltage output end (61) of control power supply (6), the rear surface (52) and the control are electric
Earth terminal (62) connection in source (6).
5. the Demodulation System for Fiber Optic Fabry-Perot Sensors according to claim any one of 1-4, it is characterized in that：The single-point is visited
It is single-point indium gallium arsenic detector or single-point silicon detector to survey device (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611218187.8A CN106767959B (en) | 2016-12-26 | 2016-12-26 | A kind of Demodulation System for Fiber Optic Fabry-Perot Sensors |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611218187.8A CN106767959B (en) | 2016-12-26 | 2016-12-26 | A kind of Demodulation System for Fiber Optic Fabry-Perot Sensors |
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| Publication Number | Publication Date |
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| CN106767959A true CN106767959A (en) | 2017-05-31 |
| CN106767959B CN106767959B (en) | 2019-04-30 |
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| CN201611218187.8A Active CN106767959B (en) | 2016-12-26 | 2016-12-26 | A kind of Demodulation System for Fiber Optic Fabry-Perot Sensors |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520429A (en) * | 2018-11-26 | 2019-03-26 | 重庆大学 | The few spectrum sample point high-speed measuring system and method for white light interference type optical fiber Fabry-Perot sensor |
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| CN201965369U (en) * | 2011-01-30 | 2011-09-07 | 福建中策光电科技有限公司 | Electro-optic crystal modulating device |
| CN103033202A (en) * | 2012-05-18 | 2013-04-10 | 天津大学 | Phase-shifting high-speed low coherence interference demodulating device and method thereof |
| CN106017519B (en) * | 2016-05-05 | 2018-05-22 | 重庆大学 | A kind of Demodulation System for Fiber Optic Fabry-Perot Sensors and method |
-
2016
- 2016-12-26 CN CN201611218187.8A patent/CN106767959B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| US3918007A (en) * | 1974-03-25 | 1975-11-04 | Rca Corp | Fabry-perot polarization laser beam modulator |
| CN1448695A (en) * | 2003-04-18 | 2003-10-15 | 重庆大学 | Optical fibre transducer general purpose high speed waveguide wavelength scanning demodulation process and apparatus |
| CN201965369U (en) * | 2011-01-30 | 2011-09-07 | 福建中策光电科技有限公司 | Electro-optic crystal modulating device |
| CN103033202A (en) * | 2012-05-18 | 2013-04-10 | 天津大学 | Phase-shifting high-speed low coherence interference demodulating device and method thereof |
| CN106017519B (en) * | 2016-05-05 | 2018-05-22 | 重庆大学 | A kind of Demodulation System for Fiber Optic Fabry-Perot Sensors and method |
Non-Patent Citations (1)
| Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109520429A (en) * | 2018-11-26 | 2019-03-26 | 重庆大学 | The few spectrum sample point high-speed measuring system and method for white light interference type optical fiber Fabry-Perot sensor |
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| CN106767959B (en) | 2019-04-30 |
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