CN106767959B - 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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- CN106767959B CN106767959B CN201611218187.8A CN201611218187A CN106767959B CN 106767959 B CN106767959 B CN 106767959B CN 201611218187 A CN201611218187 A CN 201611218187A CN 106767959 B CN106767959 B CN 106767959B
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- 239000000835 fiber Substances 0.000 title claims abstract description 39
- 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
- 230000003287 optical effect Effects 0.000 claims 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
- 238000010276 construction Methods 0.000 claims description 3
- 241001227124 Dialytes Species 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 14
- 230000008859 change Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000008569 process 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
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000001782 photodegradation Methods 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
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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
- G01D5/266—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, the wideband light source being connect by the first optical fiber with the fiber optic coupler, the fine Fabry-Perot sensor being connect by the second optical fiber with the fiber optic coupler, the port for the third optical fiber connecting with the fiber optic coupler is equipped with fibre-optical splice, it is characterized in that: further including collimation lens corresponding with the fibre-optical splice, electro-optic crystal that is corresponding with the collimation lens and connecting to the control circuit, convergent lens corresponding with the electro-optic crystal, single point detector corresponding with the convergent lens.The present invention can be used for the measurement of the physical quantitys such as power, acceleration, strain, vibration under high temperature and pressure, and the available more accurate measurement result of demodulating system.
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 power, acceleration, strain, the vibration that can be used under high temperature and pressure.
Background technique
Optical fiber Fabry-Perot sensor is a kind of novel sensor, by making two high reflection film layers in optical fiber, forms one
A F-P microcavity with certain size occurs the multiple-beam interference of transmission and reflection, is reflected back when light beam passes through this F-P cavity
The interference signal come carries the long change information of chamber.So causing F-P cavity chamber is long to generate when extraneous parameter changes
Corresponding variation, to change interference signal, it is achieved that sensing.
Fibre-optical F-P sensor and fiber F-P demodulating system determine the detection accuracy and speed of fiber F-P sensor-based system together
Degree, demodulating system is very important a part in fiber F-P sensor-based system.The optical parameter utilized according to demodulation mode is not
Together, the demodulation of optical fiber Fabry-Perot sensing can be mainly divided into: intensity demodulation and phase demodulating.The invention uses a kind of 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 issues 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
Inject dense wave division multiplexer；After dense wave division multiplexer filters by the broadband reflection photodegradation of injection be three beams different wave length
Narrow band light；This three beams narrowband light wave injection light electric explorer, after photoelectric conversion and filter and amplification by acquisition process unit into
The phase or change of cavity length amount of F-P cavity sensor to be measured is calculated in row high-speed sampling and data processing.Which not only reduces skills
Art difficulty, substantially reduces system cost, additionally it is possible to realize that the high speed of fiber F-P cavity sensor, high-precision demodulate, be particularly suitable for
Dynamic measures, such as the measurement of blast pressure.Undoubtedly, this is a kind of good try of technical field.
Summary of the invention
The object of the present invention is to provide a kind of Demodulation System for Fiber Optic Fabry-Perot Sensors, can be used for power under high temperature and pressure plus
The measurement of the physical quantitys such as speed, strain, vibration, and the available more accurate measurement result of demodulating system.
A kind of Demodulation System for Fiber Optic Fabry-Perot Sensors of the present invention, including fiber optic coupler, pass through the first light
The fine wideband light source being connect with the fiber optic coupler, the light being connect by the second optical fiber with the fiber optic coupler
The port of fine Fabry-Perot sensor, the third optical fiber connecting with the fiber optic coupler is equipped with fibre-optical splice, it is characterized in that:
Further include collimation lens corresponding with the fibre-optical splice, and the electric light that connects to the control circuit corresponding with the collimation lens it is brilliant
Body and the corresponding convergent lens of the electro-optic crystal, single point detector corresponding with the convergent lens.
Further, the 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 slab construction and the inclination angle with 15 to 20 degree, front surface and rear table
Face is coated with semi-transparent semi-reflecting film layer, and the front surface is connect with the voltage output end of the control power supply, the rear surface and institute
State the ground 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 the following beneficial effects:
The present invention applies a kind of electro-optic crystal, electrooptic effect can occur under the action of an external electric field for electro-optic crystal, i.e. crystal
Refractive index will change with external electric field and be changed.In such a way that voltage change constantly changes crystal refractive index, make to reach demodulation system
The interfering beam of system occurs to reflect and be transmitted on crystal, when the refractive index of crystal reaches certain numerical value, the light of the reflected beams
Path difference is equal with F-P cavity chamber length, it can obtains very big light intensity signal in detector.Since this demodulating system uses Fabry-perot optical fiber
Sensor realizes multi-angle, multidirectional measurement；Due to using collimated light path structure, the wide wave-length coverage of light source may be implemented
Measurement；Due to utilizing electro-optic crystal, the measurement of wide size range can be realized by changing voltage；Due to using single-point to detect
Measurement accuracy and speed can be improved in device.To sum up, the demodulation essence of fibre optical sensor demodulating system can be improved in the invention
Degree, speed and raising measurement range.
Detailed description of the invention
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 connects to the control circuit；
Fig. 4 is the structural schematic diagram of electro-optic crystal.
In figure: 1- wideband light source, 2- fiber optic coupler, 3- optical fiber Fabry-Perot sensor, 4- collimation lens, 5-
Electro-optic crystal, 6- control circuit, 7- convergent lens, 8- single point detector；
The first optical fiber of 21-, the second optical fiber of 22-, 23- third optical fiber, 24- fibre-optical splice；
51- front surface, 52- rear surface；
61- voltage output end, 62- ground terminal.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
A kind of Demodulation System for Fiber Optic Fabry-Perot Sensors referring to FIG. 1 to FIG. 4, including fiber optic coupler 2, pass through
The fine Fabry-Perot sensor 3 that first optical fiber 21 is connect with the fiber optic coupler is connect with the fiber optic coupler
The port of third optical fiber 23 is equipped with fibre-optical splice 24, further includes collimation lens 4 corresponding with the fibre-optical splice 24 and institute
State that collimation lens is corresponding and and control circuit 6 electro-optic crystal 5, convergent lens 7 corresponding with the electro-optic crystal and the institute that connect
State the corresponding single point detector 8 of convergent lens.
The 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 has various structures form in different measurement requests, such as: 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, and collimation lens is needed to be translated into collimated light beam outgoing, and collimation is saturating
Mirror according to aberration require can there are many form, such as: single convex lens, biconvex lens, cemented doublet, air-spaced doublet etc..
The electro-optic crystal 5 is slab construction and the inclination angle with 15 to 20 degree, front surface 51 and rear surface 52
It is coated with semi-transparent semi-reflecting film layer, the front surface 51 is connect with the voltage output end 61 of the control power supply 6, the rear surface 52
It is connect with the ground terminal 62 of the control power supply 6.Electro-optic crystal is used to match the optical path difference of optical fiber Fabry-Perot sensor.Fabry-perot optical fiber
For sensor due to multiple-beam interference, change of cavity length determines the coherency states of reflected light, passes through 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 for receiving meeting
Focal beam selects single-point indium gallium arsenic detector or single-point silicon detector according to demodulation speed and required precision.
Embodiment-, optical fiber Fabry-Perot sensor 3 select optical-fiber Fabry-Perot force sensor, and collimation lens 4 selects biconvex lens, single
Point detector 8 selects single-point indium gallium arsenic detector.
Embodiment two, optical fiber Fabry-Perot sensor 3 select Fabry-perot optical fiber strain sensor, and collimation lens 4 selects double glued saturating
Mirror, single point detector 8 select single-point silicon detector.
Embodiment three, optical fiber Fabry-Perot sensor 3 select Fabry-perot optical fiber acceleration transducer, and collimation lens 4 selects double separation
Lens, single point detector 8 select single-point indium gallium arsenic detector.
Optical fiber Fabry-Perot sensor 3, collimation lens 4 and single point detector 8 can also be selected according to different requirements, constituted another
Outer multiple specific embodiments.
The light beam that wideband light source 1 of the invention issues enters through the first optical fiber 21, fiber optic coupler 2, the second optical fiber 22
It is incident upon optical fiber Fabry-Perot sensor 3, 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 third optical fiber 23 along the second optical fiber 22, fiber optic coupler 2, and by 23 end of third optical fiber
Fibre-optical splice 24 on mouth is incident to collimation lens 4；Collimation lens 4 makes on 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 collimate reaches electric light
The front surface 51 of crystal, the refractive index inside electro-optic crystal 5 change with the variation of 6 output voltage of control circuit；Directional light
In the front surface 51 and rear surface 52 of electro-optic crystal multiple-beam interference occurs for beam, since collimated light beam is per se with Fabry-Perot sensor
Chamber long message, so when 5 inner refractive index of electro-optic crystal variation when, light beam electro-optic crystal surface reflection and enter electric light
Reflected two beams coherent light optical path difference is met certain condition crystals again, can be obtained on single point detector greatly
Intensity signal.Finally, being received after being assembled by the concentrated lens 7 of coherent light that electro-optic crystal reflects by single point detector 8.
For electro-optic crystal of the invention under the action of control circuit, different voltage leads to electro-optic crystal refraction index changing,
The optical path difference that the Fa-Po cavity of optical fiber Fabry-Perot sensor generates is matched, the change of cavity length letter of Fa-Po cavity is obtained on single-point simple detector
Breath, finally obtains the physical quantity information of measurand.The present invention can be using power at high temperature under high pressure, acceleration, strain, vibration
The measurement of the physical quantitys such as dynamic, and accurate measurement result can be obtained.
Claims (2)
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 connect by the second optical fiber (22) with the fiber optic coupler
The port of fine Fabry-Perot sensor (3), the third optical fiber (23) connecting with the fiber optic coupler is equipped with fibre-optical splice
(24), it is characterized in that: further include collimation lens (4) corresponding with the fibre-optical splice (24), with the collimation lens it is corresponding simultaneously
And control the electro-optic crystal (5), convergent lens corresponding with the electro-optic crystal (7) and the convergent lens of power supply (6) connection
Corresponding single point detector (8)；The optical fiber Fabry-Perot sensor (3) is optical-fiber Fabry-Perot force sensor, Fabry-perot optical fiber strain biography
Sensor or Fabry-perot optical fiber acceleration transducer；The collimation lens (4) is single convex lens, biconvex lens, cemented doublet or double
Dialyte lens；
The electro-optic crystal (5) is slab construction and opposite collimation lens tilt, where the optical axis of the collimation lens (4)
The angle of horizontal plane be 15 degree to 20 degree, front surface (51) and rear surface (52) are coated with semi-transparent semi-reflecting film layer, before described
Surface (51) is connect with the voltage output end (61) of control power supply (6), the rear surface (52) and the control power supply (6)
Ground terminal (62) connection.
2. Demodulation System for Fiber Optic Fabry-Perot Sensors according to claim 1, it is characterized in that: the single point detector (8) is
Single-point indium gallium arsenic detector or single-point silicon detector.
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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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| 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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| CN106767959A CN106767959A (en) | 2017-05-31 |
| CN106767959B true CN106767959B (en) | 2019-04-30 |
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| CN109520429B (en) * | 2018-11-26 | 2020-11-06 | 重庆大学 | Few-spectrum sampling point high-speed measurement system and method of white light interference type optical fiber Fabry-Perot sensor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2016
- 2016-12-26 CN CN201611218187.8A patent/CN106767959B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|
| 基于可调谐珐珀滤波器的光纤珐珀传感解调系统研究;王军 等;《激光杂志》;20061231;第27卷(第4期);第39-40页 |
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