CN109029517B - A kind of high-precision optical fiber sensor based on your interference structure of Mach Zehnder - Google Patents
A kind of high-precision optical fiber sensor based on your interference structure of Mach Zehnder Download PDFInfo
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- CN109029517B CN109029517B CN201810888834.9A CN201810888834A CN109029517B CN 109029517 B CN109029517 B CN 109029517B CN 201810888834 A CN201810888834 A CN 201810888834A CN 109029517 B CN109029517 B CN 109029517B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 32
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 108
- 230000003044 adaptive effect Effects 0.000 claims description 28
- 238000006243 chemical reaction Methods 0.000 claims description 25
- 230000003287 optical effect Effects 0.000 claims description 24
- 239000000919 ceramic Substances 0.000 claims description 22
- 230000009466 transformation Effects 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 8
- 239000004038 photonic crystal Substances 0.000 claims description 8
- 238000013519 translation Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 230000005622 photoelectricity Effects 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000000985 reflectance spectrum Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000018199 S phase Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229960004756 ethanol Drugs 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005305 interferometry Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
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- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000002463 transducing effect Effects 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
- G01D5/32—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 with attenuation or whole or partial obturation of beams of light
- G01D5/34—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
Abstract
A kind of your high-precision optical fiber sensor of interference structure based on Mach Zehnder of the invention belongs to fiber optic sensor technology field.Its primary structure has pumping source (1), the first photo-coupler (2), light wavelength division multiplexing (3) etc., the present invention uses sinusoidal signal as modulated signal, High-frequency Interference will not be generated, has the characteristics that work is more reliable, sensing accuracy is high, have a wide range of application.
Description
Technical field
The invention belongs to the technical field of fibre optical sensor, in particular to a kind of height based on your interference structure of Mach Zehnder
Precision optical fiber sensor.
Background technique
Electromagnetism interference, resistant to chemical etching, transmission loss is small, weight small in size because having for bragg grating (FBG)
Gently, convenient for large-scale production the advantages that, and it is widely used in field of sensing technologies.Especially in microstress detection, adverse circumstances
Temperature sensing etc., fibre optical sensor have unique advantage, the very small variation of one side temperature or stress, Bradley
Lattice fiber grating can be detected sensitively, have very high sensitivity, on the other hand in adverse circumstances such as humidity, strong electromagnetic
Under disturbed condition, bragg grating is hardly damaged, and working performance is unaffected, and signal transmission is interference-free.These are excellent
Point so that Bragg optical-fiber grating sensor be widely used in bridge, tunnel and fabric structure microstress variation monitoring,
The important safeties Workplace such as mine temperature safety monitoring.
It is the master thesis " distribution type fiber-optic of Dalian University of Technology Li Hong with the immediate prior art of the present invention
The research of Bragg grating sensor demodulation techniques ", the document provides a kind of based on non-equilibrium Mach Zehnder that interferometry demodulation
The bragg grating stress sensing system (referring to Fig. 1 .4 of page 5 of the document) of technology, the optical fiber sensing system use horse
He Ze Dare principle of interference is changed using the modulated signal that piezoelectric ceramics (PZT) is provided on the wherein arm in interferometer two-arm
Become the length of the arm, to change interferometer output intensity, interferometer output intensity is in cosine letter with the variation of PZT modulated signal
Number rule, if the modulated signal using ideal sawtooth wave as PZT, the output of optical fiber sensing system is directly cosine wave.
Optical fiber sensing system perceives the variation of measurement point stress (or temperature) by Bragg grating, and is reflected as reflectance spectrum center
The variation of wavelength, the variation of central wavelength are presented as the change of output cosine wave phase after your interferometer of above-mentioned Mach Zehnder
Change, the phase of cosine wave compares with the phase of sawtooth wave finally, can reflect bragg grating reflectance spectrum center
The variation of wavelength, to realize the variation of measurement extraneous stress (or temperature).
In above-mentioned sensor-based system, existing greatest problem is that sawtooth wave can not accomplish absolute idealization, preferably
Sawtooth wave failing edge is vertical, and the failing edge of actual sawtooth wave always has certain gradient, so that rear class can be made defeated
There are a high dithers for cosine wave out, generally necessary in grade demodulator circuit behind in order to eliminate the high-frequency jitter signal
Using bandpass filter (BPF), DC component and high fdrequency component are filtered out.But on the one hand the high fdrequency component inherently can be to remaining
The phase-detection of string wave impacts (zero crossing change in location)；On the other hand the frequency of the high-frequency jitter signal is driven by PZT
(electrical characteristics of PZT are equivalent to capacitor to the lagging characteristics of circuit performance, PZT itself, and both end voltage cannot jump, therefore
The failing edge of sawtooth wave be do not accomplish it is unlimited short) and the factors such as optical fiber elasticity itself influence, frequency size is indefinite, very
Difficulty filters out completely；Moreover, when using filter, it, can also be simultaneously other than it can be had an impact to the amplitude-frequency characteristic of output signal
The phase-frequency characteristic of signal is had an impact, i.e., filtering is that phase will receive influence near cutoff frequency, this is for relying on phase
It is very unfavorable for changing for the fibre optical sensor to measure the physical quantity variations such as stress or temperature.Therefore, existing Bradley
Lattice fiber-optic grating sensor also requires further improvement.
Summary of the invention
In order to overcome existing Bragg optical-fiber grating sensor there are the shortcomings that, the present invention provides a kind of using sinusoidal letter
A kind of high-precision optical fiber sensor based on your interference structure of Mach Zehnder number as PZT driving signal, so as to avoid height
The generation of frequency interference signal, and when handling the signal received without using filter, so as to avoid filtering
The influence that journey generates phase.
The purpose of the present invention is achieved through the following technical solutions:
A kind of high-precision optical fiber sensor based on your interference structure of Mach Zehnder, structure have, pumping source 1 and the first light
The input terminal of coupler 2 is connected, and 90% output end of the first photo-coupler 2 is connected with the end 980nm of light wavelength division multiplexing 3, light
The end 1550nm of wavelength division multiplexer 3 is connected with the one end for the optical fiber being wrapped on the first piezoelectric ceramics 12, is wrapped in the first piezoelectricity
The other end of optical fiber on ceramics 12 is connected with the input terminal of the first optoisolator 11, the control terminal of the first piezoelectric ceramics 12 and the
The output port of one PZT driving circuit 13 is connected, the output of the input terminal and D/A converting circuit 14 of the first PZT driving circuit 13
Port is connected, and the input port of D/A converting circuit 14 is connected with single-chip microcontroller 20；The output end and light of first optoisolator 11 are filtered
The light input end of wave device 10 is connected, and the electric control end of optical filter 10 is connected with single-chip microcontroller 20, the light output end of optical filter 10
It is connected with the first port of optical circulator 8, the second port of optical circulator 8 is connected with one end of Bragg grating group 9, ring of light shape
The third port of device 8 is connected with the input terminal of third photo-coupler 6,90% output end and the second light of third photo-coupler 6 every
Input terminal from device 5 is connected, and the output end of the second optoisolator 5 is connected with one end of Er-doped fiber 4, Er-doped fiber 4 it is another
End is connected with the common end of light wavelength division multiplexing 3；The output of 10% output end and the 4th photo-coupler 7 of third photo-coupler 6
Input terminal is connected, and an output end of the 4th photo-coupler 7 is connected with an input terminal of the 5th photo-coupler 26, the 4th optocoupler
The another output of clutch 7 is connected with the one end for the optical fiber being wrapped on the second piezoelectric ceramics 25, is wrapped in the second piezoelectricity pottery
The other end of optical fiber on porcelain 25 is connected with another input terminal of the 5th photo-coupler 26, the output end of the 5th photo-coupler 26
It is connected with the input terminal of the second photoelectric conversion circuit 27；
It is characterized in that, structure in addition, the output end and function translation circuit 28 of the second photoelectric conversion circuit 27 input
End is connected, and the output end of functional transformation circuit 28 is connected with an input terminal of adaptive amplitude normalizing circuit 29, adaptive width
The output end of degree normalizing circuit 29 is connected with an input terminal of phase-comparison circuit 30；The input terminal and list in controllable frequency source 23
Piece machine 20 is connected, and the output end in controllable frequency source 23 is connected with another input terminal of phase-comparison circuit 30, phase bit comparison electricity
The output end on road 30 is connected with single-chip microcontroller 20；Input terminal of the output end in controllable frequency source 23 also with the 2nd PZT driving circuit 24
It is connected, the output end of the 2nd PZT driving circuit 24 is connected with the control terminal of the second piezoelectric ceramics 25；First photo-coupler 2
10% output end is connected with an input terminal of the second photo-coupler 17, another input terminal of the second photo-coupler 17 with it is anhydrous
One end that ethyl alcohol fills photonic crystal fiber 16 is connected, and dehydrated alcohol fills the other end and the second optocoupler of photonic crystal fiber 16
One output end of clutch 17 is connected, the input of the another output of the second photo-coupler 17 and the first photoelectric conversion circuit 18
End is connected, and the output end of the first photoelectricity shifting circuit 18 is connected with the input terminal of analog to digital conversion circuit 19, analog to digital conversion circuit 19
Output end is connected with single-chip microcontroller 20；Single-chip microcontroller 20 is also connected with input key 15, serial communication modular 21, display screen 22 respectively；
The structure of the functional transformation circuit 28 is, one end of capacitor C3 and the pin 12 of trigonometric function converter U1 and
One end of resistance R2 is connected, and input terminal of the other end of capacitor C3 as functional transformation circuit 28 is denoted as port ACOS_in, with
The output end of second photoelectric conversion circuit 27 is connected；The other end of resistance R2 is grounded；The pin 2 of trigonometric function converter U1,3,
4,5,8,11,13 ground connection, pin 9,10 are connected with one end of capacitor C2 and -12V power supply, the other end ground connection of capacitor C2；Triangle
The pin 6 of function converter U1 is connected with pin 7, and pin 16 is connected with one end of+12V power supply and capacitor C1, and capacitor C1's is another
One end ground connection；The pin 1 of trigonometric function converter U1 is connected with the sliding end of slide rheostat W1, one end of slide rheostat W1
It is connected with one end of resistance R1, the other end of resistance R1 is connected with the pin 14 of trigonometric function converter U1, slide rheostat W1
Output end of the sliding end as functional transformation circuit 28, port ACOS_out is denoted as, with adaptive amplitude normalizing circuit 29
Input terminal is connected；The model AD639 of the trigonometric function converter U1；
The structure of the adaptive amplitude normalizing circuit 29 is one end of capacitor C9 and one end of resistance R3 and chip U2
Pin 3 be connected, the other end of resistance R3 ground connection, input of the other end of capacitor C9 as adaptive amplitude normalizing circuit 29
End, is denoted as port ADAPT_in, and the port ACOS_out of and function translation circuit 28 is connected；Pin 1, pin 7, the pipe of chip U2
Foot 8, pin 14 are grounded, and pin 2 is connected with+5V power supply with pin 4, and pin 11 is connected and one with capacitor C5 with pin 12
End and+5V power supply are connected, the other end ground connection of capacitor C5；The pin 13 of chip U2 is connected with one end of capacitor C4, capacitor C4's
Other end ground connection；The pin 9 of chip U2 is connected with one end of capacitor C6, the other end ground connection of capacitor C6；The pin 5 of chip U2 with
One end of resistance R12 and resistance R11 are connected, the other end ground connection of resistance R12, the output of the other end and amplifier U4 of resistance R11
End and one end of capacitor C8 are connected, the positive supply termination+5V power supply of amplifier U8, negative power end ground connection；The other end of capacitor C8 with
One end of resistance R10 is connected, and the other end of resistance R10 is connected with the non-inverting input terminal of amplifier U4；The inverting input terminal of amplifier U4
It is connected with the sliding end of sliding variohm W3, one end of slide rheostat W3 is connected with+5V power supply, and slide rheostat W3's is another
One end ground connection；One end of capacitor C7 is connected with the non-inverting input terminal of one end of resistance R9 and amplifier U4, another termination of capacitor C7
The other end on ground, resistance R9 is connected with the output end of one end of resistance R7 and amplifier U3, and the other end of resistance R7 is with amplifier U3's
Inverting input terminal is connected；One end of resistance R8 is connected with the non-inverting input terminal of amplifier U3, other end ground connection；The positive supply of amplifier U3
Termination+5V power supply, negative power end ground connection；Output end of the pin 10 of chip U2 as adaptive amplitude normalizing circuit 29, is denoted as
Port ADAPT_out is connected with an input terminal of phase-comparison circuit 30；The pin 10 of chip U2 and the anode of diode D1
It is connected, the cathode of diode D1 is connected with one end of resistance R4, the other end of resistance R4 and one end of resistance R5 and amplifier U3's
Inverting input terminal is connected, and the other end of resistance R5 is connected with the anode of diode D2, the cathode and slide rheostat of diode D2
The sliding end of W2 is connected；One end of slide rheostat W2 is connected and is grounded with the cathode of diode D3, and slide rheostat W2's is another
One end is connected with the anode of one end of resistance R6 and diode D3, another termination -5V power supply of resistance R6；The chip U2 is
Variable gain amplifier chip, model are AD8367；
The structure of the phase-comparison circuit 30 is one end of capacitor C10 and the non-inverting input terminal and resistance of amplifier U5
One end of R13 is connected, and an input terminal of the other end of capacitor C10 as phase-comparison circuit 30 is denoted as port PHASE_
In1 is connected with the port ADAPT_out of adaptive amplitude normalizing circuit 29；The other end of resistance R13 is grounded；Amplifier U5 is just
Power supply termination+5V power supply, negative power end ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U6A；D type flip flop
The port D of U6A is grounded；The one end capacitor C11 ground connection, the end PR of another termination d type flip flop U6A；Resistance R14 mono- terminates d type flip flop
The end PR of U6A, the end Q of another termination d type flip flop U6A；CLR termination+5V the power supply of d type flip flop U6A, the Q of d type flip flop U6A are non-
Terminate the end PR of d type flip flop U8A；One end of capacitor C12 is connected with one end of the non-inverting input terminal of amplifier U7 and resistance R15, electricity
Hold another input terminal of the other end of C12 as phase-comparison circuit 30, port PHASE_in2 is denoted as, with controllable frequency source
23 port SineM_out is connected；The other end of resistance R15 is grounded；Positive supply termination+5V the power supply of amplifier U7, negative power end
Ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U6B；The port D of d type flip flop U6B is grounded；Capacitor C13 mono-
End ground connection, the end PR of another termination d type flip flop U6B；Resistance R16 mono- terminates the end PR of d type flip flop U6B, another termination d type flip flop
The end Q of U6B；CLR termination+5V the power supply of d type flip flop U6B, the end CLR of the Q non-terminated d type flip flop U8A of d type flip flop U6B；D touching
The end D and the end CLK for sending out device U8A are grounded, and output end of the end Q as phase-comparison circuit 30 is denoted as port PHASE_out, with
The input terminal of single-chip microcontroller 20 is connected；
The structure in the controllable frequency source 23 is a termination+12V power supply of resistance R17, another termination triode Q1's
Base stage；The base stage of a termination triode Q1 of resistance R18, other end ground connection；A termination+12V of resistance R19, another termination three
The collector of pole pipe Q1；The anode of electrolytic capacitor C15 connects the collector of triode Q1, and cathode connects the base stage of triode Q2；Resistance
The emitter of a termination triode Q1 of R20, the anode of another termination electrolytic capacitor C14；A termination electrolytic capacitor of resistance R21
The anode of C14, other end ground connection；The cathode of electrolytic capacitor C14 is grounded；A termination+12V power supply of resistance R22, another termination three
The base stage of pole pipe Q2；The base stage of a termination triode Q2 of resistance R23, other end ground connection；A termination+12V electricity of resistance R24
Source, the collector of another termination triode Q2；The emitter of a termination triode Q2 of resistance R25, other end ground connection；Electrolysis electricity
The anode for holding C16 connects the emitter of triode Q2, cathode ground connection；The anode of electrolytic capacitor C17 connects the collector of triode Q2, bears
Pole connects one end of thermistor Rt1；The emitter of another termination triode Q1 of thermistor Rt1；Electrolytic capacitor C18 anode connects
The collector of triode Q2, cathode connect the pin 2 of chip U9；The pin 3 of a chip termination U9 of capacitor C19, another termination core
The pin 2 of piece U10；The pin 2 of a chip termination U10 of capacitor C20, other end ground connection；The anode of electrolytic capacitor C21 connects chip
The pin 2 of U10, cathode connect the base stage of triode Q1；The pin 5 of a chip termination U9 of capacitor C22, other end ground connection；Capacitor
The pin 5 of a chip termination U10 of C23, other end ground connection；The pin 1 and pin 10 of chip U9 connects+5V power supply, pin 4 and pipe
Foot 6 is grounded；One end of 9 connecting resistance R26 of pin, one end of 8 connecting resistance R27 of pin, one end of 7 connecting resistance R28 of pin；Resistance
An input port of the other end of R26 as controllable frequency source, is denoted as port SineM_in1；The other end conduct of resistance R27
Another input port in controllable frequency source, is denoted as port SineM_in2；Port SineM_in1 and port SineM_in2 and list
The input terminal of piece machine 18 is connected；Another termination+5V power supply of resistance R28；The pin 1 and pin 10 of chip U10 connects+5V power supply,
Pin 4 and pin 6 are grounded；One end of 9 connecting resistance R29 of pin, one end of 8 connecting resistance R30 of pin, the one of 7 connecting resistance R31 of pin
End；Another termination port SineM_in1 of resistance R29；Another termination port SineM_in2 of resistance R30；Resistance R31's is another
One termination+5V power supply；Output port of the cathode of electrolytic capacitor C18 as controllable frequency source, is denoted as SineM_out.
The preferred 980nm laser light source of pumping source 1.
The Bragg grating group 9 is preferably made of two Bragg gratings, and the reflectivity of each grating is 90%,
Bandwidth is 0.6nm, and central wavelength is respectively 1550nm and 1560nm.
The utility model has the advantages that
1, the present invention uses sinusoidal signal as modulated signal, compared with the prior art is modulated using sawtooth signal,
High-frequency Interference will not be generated, so that sensor-based system work is more reliable.
2, the present invention uses adaptive amplitude normalizing circuit by the amplitude auto-changing of signal after demodulation at suitable phase ratio
Compared with the size that circuit is compared, so that phase-detection error is smaller, the sensing accuracy of entire sensor-based system is effectively increased.
3, compared with prior art, frequency modulating signal of the invention is adjustable, so that sensor-based system applied field of the invention
It closes wider.
4, the present invention has temperature compensation function, effectively overcomes influence of the environment temperature to parameter sensing.
Detailed description of the invention
Fig. 1 is whole functional block diagram of the invention.
Fig. 2 is the basic circuit diagram for the functional transformation circuit that the present invention uses.
Fig. 3 is the basic circuit diagram for the adaptive amplitude normalizing circuit that the present invention uses.
Fig. 4 is the basic circuit diagram for the phase-comparison circuit that the present invention uses.
Fig. 5 is the basic circuit diagram in the controllable frequency source that the present invention uses.
Specific embodiment
The working principle of the invention is further illustrated with reference to the accompanying drawing, it should be appreciated that the component marked in attached drawing
Parameter is the preferred parameter that following embodiment uses, rather than limiting the scope of the invention.
The overall structure of the invention of embodiment 1
As shown in Figure 1, overall structure of the invention has, pumping source 1 (the LC962U type pumping source of OCLARO company, center
Wavelength 980nm, maximum single-mode output optical power are 750mW) (OZ-OPTICS company produces, model with the first photo-coupler 2
FUSED-12-1064-7/125-90/10-3U-3mm, splitting ratio 90:10) input terminal be connected, the first photo-coupler 2
The end the 980nm phase of 90% output end and light wavelength division multiplexing 3 (COMCORE company 980/1060nm single mode optical fiber wavelength division multiplexer)
Even, (cylindrical piezoelectric is ceramic, outer diameter 50mm, internal diameter with the first piezoelectric ceramics 12 is wrapped at the end 1550nm of light wavelength division multiplexing 3
40mm, high 50mm) on optical fiber one end be connected, be wrapped in the optical fiber on the first piezoelectric ceramics 12 the other end and the first light every
Input terminal from device 11 (THORLABS company IO-H-1064B single mode optoisolator) is connected, the control terminal of the first piezoelectric ceramics 12
With the output of the first PZT driving circuit 13 (the homemade device of this seminar, specific structure are shown in patent ZL200710055865.8)
Port is connected, and the input terminal of the first PZT driving circuit 13 is connected with the output port of D/A converting circuit 14, D/A converting circuit
14 input port is connected with single-chip microcontroller 20 (STC89C51 single-chip microcontroller)；The output end and optical filter 10 of first optoisolator 11
The light input end of (production of Micron Optics company, model FFP-TF-1060-010G0200-2.0) is connected, optical filter
10 electric control end is connected with single-chip microcontroller 20, the light output end and (the Shanghai Han Yu company PIOC3- of optical circulator 8 of optical filter 10
15 type optical circulators) first port be connected, (reflectivity is for the second port of optical circulator 8 and Bragg grating group 9
90%, bandwidth is 0.6nm, and central wavelength is respectively 1550nm and 1560nm) one end be connected, the third end of optical circulator 8
(OZ-OPTICS company produces mouth, model FUSED-12-1064-7/125-90/10-3U-3mm, divides with third photo-coupler 6
Light ratio is connected for the input terminal of 90:10), and (THORLABS is public for 90% output end of third photo-coupler 6 and the second optoisolator 5
Take charge of IO-H-1064B single mode optoisolator) input terminal be connected, the output end of the second optoisolator 5 and the 4 (U.S. of Er-doped fiber
Nufern company production SM-ESF-7/125 Er-doped fiber) one end be connected, the other end and optical wavelength division multiplexing of Er-doped fiber 4
The common end of device 3 is connected.Above structure constitutes basic luminaire part and the transducing part of fibre optical sensor.Third photo-coupler
6 10% output end output and 7 (the model FUSED-12-1060-7/ of OZ-OPTICS company production of the 4th photo-coupler
125-50/50-3U-3mm, splitting ratio be 50:50 1 × 2 fiber coupler) input terminal be connected, the one of the 4th photo-coupler 7
26 (the model FUSED-12-1060-7/125-50/50- of OZ-OPTICS company production of a output end and the 5th photo-coupler
3U-3mm, splitting ratio be 50:50 1 × 2 fiber coupler) an input terminal be connected, another of the 4th photo-coupler 7 is defeated
Outlet and the optical fiber being wrapped on the second piezoelectric ceramics 25 (cylindrical piezoelectric ceramics, outer diameter 50mm, internal diameter 40mm, high 50mm)
One end is connected, and is wrapped in the other end of the optical fiber on the second piezoelectric ceramics 25 and another input terminal phase of the 5th photo-coupler 26
Even, the output end of the 5th photo-coupler 26 is connected with the input terminal of the second photoelectric conversion circuit 27.Above-mentioned 4th photo-coupler 7,
Second piezoelectric ceramics 25 and the 5th photo-coupler 26 collectively constitute Mach Zehnder that interference structure.
Structure of the invention in addition, the output end and function translation circuit 28 of the second photoelectric conversion circuit 27 input terminal phase
Even, the output end of functional transformation circuit 28 is connected with an input terminal of adaptive amplitude normalizing circuit 29, and adaptive amplitude is returned
The output end of one circuit 29 is connected with an input terminal of phase-comparison circuit 30；The input terminal and single-chip microcontroller in controllable frequency source 23
20 are connected, and the output end in controllable frequency source 23 is connected with another input terminal of phase-comparison circuit 30, phase-comparison circuit 30
Output end be connected with single-chip microcontroller 20；The output end in controllable frequency source 23 also (make by oneself with the 2nd PZT driving circuit 24 by this seminar
Device, specific structure is shown in patent ZL200710055865.8) input terminal be connected, the output end of the 2nd PZT driving circuit 24
It is connected with the control terminal of the second piezoelectric ceramics 25.Above structure constitutes the demodulation part of sensor.First photo-coupler 2
One input terminal phase of 10% output end and the second photo-coupler 17 (2 × 2 standard single mode photo-couplers, splitting ratio 50:50)
Even, another input terminal of the second photo-coupler 17 and dehydrated alcohol filling photonic crystal fiber 16 are (public by NKT Photonics
Take charge of production PM-1550-01 photonic crystal fiber airport filling dehydrated alcohol constitute) one end be connected, dehydrated alcohol is filled out
The other end for filling photonic crystal fiber 16 is connected with an output end of the second photo-coupler 17, the second photo-coupler 17 it is another
A output end is connected with the input terminal of the first photoelectric conversion circuit 18, output end and the analog-to-digital conversion electricity of the first photoelectricity shifting circuit 18
The input terminal on road 19 is connected, and the output end of analog to digital conversion circuit 19 is connected with single-chip microcontroller 20.Above structure be the present invention provides
Temperature compensation function.Single-chip microcontroller 20 is also connected with input key 15, serial communication modular 21, display screen 22 respectively, for being arranged
Parameter communicates with computer and shows the functions such as information.
2 functional transformation circuit of embodiment
The structure of the functional transformation circuit 28 is, one end of capacitor C3 and the pin 12 of trigonometric function converter U1 and
One end of resistance R2 is connected, and input terminal of the other end of capacitor C3 as functional transformation circuit 28 is denoted as port ACOS_in, with
The output end of second photoelectric conversion circuit 27 is connected；The other end of resistance R2 is grounded；The pin 2 of trigonometric function converter U1,3,
4,5,8,11,13 ground connection, pin 9,10 are connected with one end of capacitor C2 and -12V power supply, the other end ground connection of capacitor C2；Triangle
The pin 6 of function converter U1 is connected with pin 7, and pin 16 is connected with one end of+12V power supply and capacitor C1, and capacitor C1's is another
One end ground connection；The pin 1 of trigonometric function converter U1 is connected with the sliding end of slide rheostat W1, one end of slide rheostat W1
It is connected with one end of resistance R1, the other end of resistance R1 is connected with the pin 14 of trigonometric function converter U1, slide rheostat W1
Output end of the sliding end as functional transformation circuit 28, port ACOS_out is denoted as, with adaptive amplitude normalizing circuit 29
Input terminal is connected；The model AD639 of the trigonometric function converter U1；The circuit has the function of anti-cosine transform, second
The signal that photoelectric conversion circuit 27 exports carries out anticosine processing.
The adaptive amplitude normalizing circuit of embodiment 3
Since the signal amplitude that functional transformation circuit 28 exports is smaller, and influenced by multiple parameters in optical path and circuit,
Size is indefinite, therefore the present invention devises adaptive amplitude normalizing circuit 29, for the signal for exporting functional transformation circuit 28
Amplitude normalization at best size, to further increase the precision of demodulation.The knot of the adaptive amplitude normalizing circuit 29
Structure is that one end of capacitor C9 is connected with the pin 3 of one end of resistance R3 and chip U2, the other end ground connection of resistance R3, capacitor C9
Input terminal of the other end as adaptive amplitude normalizing circuit 29, be denoted as port ADAPT_in, and function translation circuit 28
Port ACOS_out is connected；Pin 1, pin 7, pin 8, the pin 14 of chip U2 is grounded, and pin 2 and pin 4 are electric with+5V
Source is connected, and pin 11 is connected with pin 12 and is connected with one end of capacitor C5 and+5V power supply, the other end ground connection of capacitor C5；Core
The pin 13 of piece U2 is connected with one end of capacitor C4, the other end ground connection of capacitor C4；The pin 9 of chip U2 and one end of capacitor C6
It is connected, the other end ground connection of capacitor C6；The pin 5 of chip U2 is connected with one end of resistance R12 and resistance R11, and resistance R12's is another
One end ground connection, the other end of resistance R11 are connected with one end of the output end of amplifier U4 and capacitor C8, the positive supply termination of amplifier U8
+ 5V power supply, negative power end ground connection；The other end of capacitor C8 is connected with one end of resistance R10, the other end and amplifier of resistance R10
The non-inverting input terminal of U4 is connected；The inverting input terminal of amplifier U4 is connected with the sliding end of sliding variohm W3, slide rheostat
One end of W3 is connected with+5V power supply, the other end ground connection of slide rheostat W3；One end of capacitor C7 and one end of resistance R9 and fortune
The non-inverting input terminal for putting U4 is connected, the other end ground connection of capacitor C7, the other end of resistance R9 and one end of resistance R7 and amplifier U3
Output end be connected, the other end of resistance R7 is connected with the inverting input terminal of amplifier U3；One end of resistance R8 is same with amplifier U3's
Phase input terminal is connected, other end ground connection；Positive supply termination+5V the power supply of amplifier U3, negative power end ground connection；The pin 10 of chip U2
As the output end of adaptive amplitude normalizing circuit 29, it is denoted as port ADAPT_out, an input with phase-comparison circuit 30
End is connected；The pin 10 of chip U2 is connected with the anode of diode D1, and the cathode of diode D1 is connected with one end of resistance R4, electricity
The other end of resistance R4 is connected with the inverting input terminal of one end of resistance R5 and amplifier U3, and the other end of resistance R5 is with diode D2's
Anode is connected, and the cathode of diode D2 is connected with the sliding end of slide rheostat W2；One end of slide rheostat W2 and diode
The cathode of D3 is connected and is grounded, and the other end of slide rheostat W2 is connected with the anode of one end of resistance R6 and diode D3, electricity
Hinder another termination -5V power supply of R6；The chip U2 is variable gain amplifier chip, and model is AD8367.
4 phase-comparison circuit of embodiment
As shown in figure 4, the structure for the bit comparison circuit 30 that the present invention uses is, one end of capacitor C10 is same with amplifier U5's
One end of phase input terminal and resistance R13 are connected, an input terminal of the other end of capacitor C10 as phase-comparison circuit 30, note
For port PHASE_in1, it is connected with the port ADAPT_out of adaptive amplitude normalizing circuit 29；Another termination of resistance R13
Ground；Positive supply termination+5V the power supply of amplifier U5, negative power end ground connection, reverse inter-input-ing ending grounding, output termination d type flip flop U6A's
The end CLK；The port D of d type flip flop U6A is grounded；The one end capacitor C11 ground connection, the end PR of another termination d type flip flop U6A；Resistance R14
The end PR of one termination d type flip flop U6A, the end Q of another termination d type flip flop U6A；CLR termination+5V the power supply of d type flip flop U6A, D touching
Send out the end PR of the Q non-terminated d type flip flop U8A of device U6A；One end of capacitor C12 and the non-inverting input terminal of amplifier U7 and resistance R15's
One end is connected, another input terminal of the other end of capacitor C12 as phase-comparison circuit 30 is denoted as port PHASE_in2, with
The port SineM_out in controllable frequency source 23 is connected；The other end of resistance R15 is grounded；Positive supply termination+5V the electricity of amplifier U7
Source, negative power end ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U6B；The port D of d type flip flop U6B connects
Ground；The one end capacitor C13 ground connection, the end PR of another termination d type flip flop U6B；Resistance R16 mono- terminates the end PR of d type flip flop U6B, separately
The end Q of one termination d type flip flop U6B；CLR termination+5V the power supply of d type flip flop U6B, the Q non-terminated d type flip flop of d type flip flop U6B
The end CLR of U8A；The end D and the end CLK of d type flip flop U8A is grounded, and output end of the end Q as phase-comparison circuit 30 is denoted as end
Mouth PHASE_out, is connected with the input terminal of single-chip microcontroller 20.The standard sine wave that the circuit exports controllable frequency source 23 with it is adaptive
The sine wave (environment that its phase is detected by Bragg grating group 9 is influenced) for answering amplitude normalizing circuit 29 to export carries out phase ratio
Compared with, and by comparison result be sent into single-chip microcontroller 20, single-chip microcontroller 20 according to the phase differential, calculate at Bragg grating group 9 to
Survey the variation of physical quantity.
5 controllable frequency source of embodiment
As shown in figure 5, the structure in controllable frequency source 23 used in the present invention is, a termination+12V power supply of resistance R17,
The base stage of another termination triode Q1；The base stage of a termination triode Q1 of resistance R18, other end ground connection；One end of resistance R19
Connect+12V, the collector of another termination triode Q1；The anode of electrolytic capacitor C15 connects the collector of triode Q1, and cathode connects three
The base stage of pole pipe Q2；The emitter of a termination triode Q1 of resistance R20, the anode of another termination electrolytic capacitor C14；Resistance
The anode of a termination electrolytic capacitor C14 of R21, other end ground connection；The cathode of electrolytic capacitor C14 is grounded；A termination of resistance R22
+ 12V power supply, the base stage of another termination triode Q2；The base stage of a termination triode Q2 of resistance R23, other end ground connection；Resistance
A termination+12V power supply of R24, the collector of another termination triode Q2；The emitter of a termination triode Q2 of resistance R25,
Other end ground connection；The anode of electrolytic capacitor C16 connects the emitter of triode Q2, cathode ground connection；The anode of electrolytic capacitor C17 connects three
The collector of pole pipe Q2, cathode connect one end of thermistor Rt1；The emitter of another termination triode Q1 of thermistor Rt1；
Electrolytic capacitor C18 anode connects the collector of triode Q2, and cathode connects the pin 2 of chip U9；A chip termination U9's of capacitor C19
Pin 3, the pin 2 of another chip termination U10；The pin 2 of a chip termination U10 of capacitor C20, other end ground connection；Electrolysis electricity
The anode for holding C21 connects the pin 2 of chip U10, and cathode connects the base stage of triode Q1；The pin of a chip termination U9 of capacitor C22
5, other end ground connection；The pin 5 of a chip termination U10 of capacitor C23, other end ground connection；The pin 1 and pin 10 of chip U9 connects
+ 5V power supply, pin 4 and pin 6 are grounded；One end of 9 connecting resistance R26 of pin, one end of 8 connecting resistance R27 of pin, pin 7 connect electricity
Hinder one end of R28；An input port of the other end of resistance R26 as controllable frequency source 23, is denoted as port SineM_in1；
Another input port of the other end of resistance R27 as controllable frequency source 23, is denoted as port SineM_in2；Port SineM_
In1 and port SineM_in2 are connected with the input terminal of single-chip microcontroller 18；Another termination+5V power supply of resistance R28；The pipe of chip U10
Foot 1 and pin 10 connect+5V power supply, and pin 4 and pin 6 are grounded；One end of 9 connecting resistance R29 of pin, the one of 8 connecting resistance R30 of pin
End, one end of 7 connecting resistance R31 of pin；Another termination port SineM_in1 of resistance R29；Another termination port of resistance R30
SineM_in2；Another termination+5V power supply of resistance R31；Output end of the cathode of electrolytic capacitor C18 as controllable frequency source 23
Mouthful, it is denoted as SineM_out.The adjustable standard sine wave of module output frequency, provides required for demodulation part of the invention
Sinusoidal signal.
6 the working principle of the invention of embodiment
In conjunction with the various embodiments described above and each attached drawing, illustrate the working principle of the invention.When work, by bragg grating
Group 9 is placed on each position for needing to monitor, and (bridge of such as wanting monitor stress to change or wants monitoring temperature at building load-bearing pillar
The mine etc. of variation), it is bragg grating group by the optical fiber laser annular chamber that Er-doped fiber 4, optoisolator 5 etc. form
9 provide wideband light source, and each bragg grating has a specific reflectance spectrum, different gratings, the peak of reflectance spectrum
It is different to be worth wavelength, when some measurand stress changes, the reflectance spectrum peak wave of the bragg grating at this
Length can occur to deviate accordingly, and reflected light enters by the 4th photo-coupler 7, the second piezoelectric ceramics 25,26 structure of the 5th photo-coupler
At Mach Zehnder your interferometer in, while controllable frequency source 23 is that Mach Zehnder that interferometer provides a control signal sin
(ω t), the signal are influenced in interferometer by the light that bragg grating reflects, then through 27 turns of the second photoelectric conversion circuit
It changes electric signal into and sin (ω t+ Δ θ) is obtained later by the anti-cosine transform of functional transformation circuit 28, the signal is through adaptive width
Degree 29 amplitude of normalizing circuit is adjusted to a suitable size, and signal and controllable frequency source 23 at this time generates sinusoidal signal
Sin (ω t) is compared, and phase is changed, and is come out the phase difference detection of the two by phase-comparison circuit 30 and is sent into list
Piece machine 20, the phase difference real reaction variation of the measured physical quantity of measured point are finally realized and are monitored to measured point.This hair
It is bright during modulation and demodulation without using sawtooth wave, so as to avoid sawtooth wave failing edge bring high-frequency jitter signal,
Also there is no need to use bandpass filter to be filtered in demodulator circuit, the amplitude-frequency characteristic and phase frequency to output signal are avoided
Characteristic has an impact.The present invention is demodulated using standard sine wave signal as PZT modulated signal to modulated signal
When, functional transformation circuit 28 and adaptive amplitude normalizing circuit 29 are dexterously used, modulated signal is recovered into phase by cloth
Glug grating group 9 controls and amplitude suitable sinusoidal signal can when so that carrying out phase bit comparison in phase-comparison circuit 30
Highly precisely to compare the phase difference of controlled signal and original signal, to accurately react sensing head (i.e. Prague light
Grid group 9) environmental parameter that is detected.
Since optical fiber laser annular chamber (is generally sensed with bragg grating group 9 vulnerable to environment temperature at work
Pop one's head in not in same position) influence, therefore temperature compensation function has also been devised in the present invention, fills photonic crystal by dehydrated alcohol
Optical fiber 16, the second photo-coupler 17, the first photoelectric conversion circuit 18, analog to digital conversion circuit 19 are constituted.Dehydrated alcohol fills photon
Crystal optical fibre 16 is temperature sensor, can cause to generate variation by the phase of its laser when the environmental temperature is changed, into
And change the output electric current of the first photoelectric conversion circuit, then be converted into digital signal input single-chip microcontroller through analog to digital conversion circuit 19
20, measurement result bring error is given in the variation for environment temperature locating for compensated optical fiber laser annular chamber.
Claims (3)
1. a kind of high-precision optical fiber sensor based on your interference structure of Mach Zehnder, structure have, pumping source (1) and the first light
The input terminal of coupler (2) is connected, the end the 980nm phase of 90% output end and light wavelength division multiplexing (3) of the first photo-coupler (2)
Even, the end 1550nm of light wavelength division multiplexing (3) is connected with the one end for the optical fiber being wrapped on the first piezoelectric ceramics (12), is wrapped in
The other end of optical fiber on first piezoelectric ceramics (12) is connected with the input terminal of the first optoisolator (11), the first piezoelectric ceramics
(12) control terminal is connected with the output port of the first PZT driving circuit (13), the input terminal of the first PZT driving circuit (13) with
The output port of D/A converting circuit (14) is connected, and the input port of D/A converting circuit (14) is connected with single-chip microcontroller (20)；The
The output end of one optoisolator (11) is connected with the light input end of optical filter (10), the electric control end of optical filter (10) and list
Piece machine (20) is connected, and the light output end of optical filter (10) is connected with the first port of optical circulator (8), optical circulator (8)
Second port is connected with the one end of Bragg grating group (9), third port and third photo-coupler (6) of optical circulator (8)
Input terminal be connected, 90% output end of third photo-coupler (6) is connected with the input terminal of the second optoisolator (5), the second light every
Output end from device (5) is connected with one end of Er-doped fiber (4), the other end and light wavelength division multiplexing (3) of Er-doped fiber (4)
Common end is connected；10% output end of third photo-coupler (6) is connected with the input terminal of the 4th photo-coupler (7), the 4th optocoupler
One output end of clutch (7) is connected with an input terminal of the 5th photo-coupler (26), the 4th photo-coupler (7) another
Output end is connected with the one end for the optical fiber being wrapped on the second piezoelectric ceramics (25), the light being wrapped on the second piezoelectric ceramics (25)
The fine other end is connected with another input terminal of the 5th photo-coupler (26), the output end and second of the 5th photo-coupler (26)
The input terminal of photoelectric conversion circuit (27) is connected；
It is characterized in that, structure in addition, the output end and function translation circuit (28) of the second photoelectric conversion circuit (27) input
End is connected, and the output end of functional transformation circuit (28) is connected with an input terminal of adaptive amplitude normalizing circuit (29), adaptive
The output end of amplitude normalizing circuit (29) is answered to be connected with an input terminal of phase-comparison circuit (30)；Controllable frequency source (23)
Input terminal is connected with single-chip microcontroller (20), the output end of controllable frequency source (23) and another input terminal of phase-comparison circuit (30)
It is connected, the output end of phase-comparison circuit (30) is connected with single-chip microcontroller (20)；The output end in controllable frequency source (23) is also with second
The input terminal of PZT driving circuit (24) is connected, the control of the output end and the second piezoelectric ceramics (25) of the 2nd PZT driving circuit (24)
End processed is connected；10% output end of the first photo-coupler (2) is connected with an input terminal of the second photo-coupler (17), the second light
Another input terminal of coupler (17) is connected with one end of dehydrated alcohol filling photonic crystal fiber (16), dehydrated alcohol filling
The other end of photonic crystal fiber (16) is connected with an output end of the second photo-coupler (17), the second photo-coupler (17)
Another output is connected with the input terminal of the first photoelectric conversion circuit (18), the output end and mould of the first photoelectricity shifting circuit (18)
The input terminal of number conversion circuit (19) is connected, and the output end of analog to digital conversion circuit (19) is connected with single-chip microcontroller (20)；Single-chip microcontroller
(20) also it is connected respectively with input key (15), serial communication modular (21), display screen (22)；
The structure of the functional transformation circuit (28) is one end of capacitor C3 and the pin 12 and electricity of trigonometric function converter U1
The one end for hindering R2 is connected, and input terminal of the other end of capacitor C3 as functional transformation circuit (28) is denoted as port ACOS_in, with
The output end of second photoelectric conversion circuit (27) is connected；The other end of resistance R2 is grounded；The pin 2 of trigonometric function converter U1,
3,4,5,8,11,13 ground connection, pin 9,10 are connected with one end of capacitor C2 and -12V power supply, the other end ground connection of capacitor C2；Three
The pin 6 of angle function converter U1 is connected with pin 7, and pin 16 is connected with one end of+12V power supply and capacitor C1, capacitor C1's
Other end ground connection；The pin 1 of trigonometric function converter U1 is connected with the sliding end of slide rheostat W1, and the one of slide rheostat W1
End is connected with one end of resistance R1, and the other end of resistance R1 is connected with the pin 14 of trigonometric function converter U1, slide rheostat
Output end of the sliding end of W1 as functional transformation circuit (28), is denoted as port ACOS_out, with adaptive amplitude normalizing circuit
(29) input terminal is connected；The model AD639 of the trigonometric function converter U1；
The structure of the adaptive amplitude normalizing circuit (29) is, one end of capacitor C9 and one end of resistance R3 and chip U2's
Pin 3 is connected, the other end ground connection of resistance R3, input of the other end of capacitor C9 as adaptive amplitude normalizing circuit (29)
End, is denoted as port ADAPT_in, and the port ACOS_out of and function translation circuit (28) is connected；The pin 1 of chip U2, pin 7,
Pin 8, pin 14 are grounded, and pin 2 is connected with+5V power supply with pin 4, and pin 11 is connected with pin 12 and with capacitor C5's
One end and+5V power supply are connected, the other end ground connection of capacitor C5；The pin 13 of chip U2 is connected with one end of capacitor C4, capacitor C4
The other end ground connection；The pin 9 of chip U2 is connected with one end of capacitor C6, the other end ground connection of capacitor C6；The pin 5 of chip U2
It is connected with one end of resistance R12 and resistance R11, the other end of resistance R12 ground connection, the other end of resistance R11 is defeated with amplifier U4's
One end of outlet and capacitor C8 are connected, the positive supply termination+5V power supply of amplifier U8, negative power end ground connection；The other end of capacitor C8
It is connected with one end of resistance R10, the other end of resistance R10 is connected with the non-inverting input terminal of amplifier U4；The anti-phase input of amplifier U4
It holds and is connected with the sliding end of sliding variohm W3, one end of slide rheostat W3 is connected with+5V power supply, slide rheostat W3's
Other end ground connection；One end of capacitor C7 is connected with the non-inverting input terminal of one end of resistance R9 and amplifier U4, the other end of capacitor C7
Ground connection, the other end of resistance R9 are connected with the output end of one end of resistance R7 and amplifier U3, the other end and amplifier U3 of resistance R7
Inverting input terminal be connected；One end of resistance R8 is connected with the non-inverting input terminal of amplifier U3, other end ground connection；The positive electricity of amplifier U3
Source connects+5V power supply, negative power end ground connection；Output end of the pin 10 of chip U2 as adaptive amplitude normalizing circuit (29),
It is denoted as port ADAPT_out, is connected with an input terminal of phase-comparison circuit (30)；The pin 10 and diode D1 of chip U2
Anode be connected, the cathode of diode D1 is connected with one end of resistance R4, the other end of resistance R4 and one end of resistance R5 and fortune
The inverting input terminal for putting U3 is connected, and the other end of resistance R5 is connected with the anode of diode D2, the cathode of diode D2 and sliding
The sliding end of rheostat W2 is connected；One end of slide rheostat W2 is connected and is grounded with the cathode of diode D3, slide rheostat
The other end of W2 is connected with the anode of one end of resistance R6 and diode D3, another termination -5V power supply of resistance R6；The core
Piece U2 is variable gain amplifier chip, and model is AD8367；
The structure of the phase-comparison circuit (30) is one end of capacitor C10 and the non-inverting input terminal of amplifier U5 and resistance R13
One end be connected, an input terminal of the other end of capacitor C10 as phase-comparison circuit (30) is denoted as port PHASE_in1,
It is connected with the port ADAPT_out of adaptive amplitude normalizing circuit (29)；The other end of resistance R13 is grounded；The positive electricity of amplifier U5
Source connects+5V power supply, negative power end ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U6A；D type flip flop
The port D of U6A is grounded；The one end capacitor C11 ground connection, the end PR of another termination d type flip flop U6A；Resistance R14 mono- terminates d type flip flop
The end PR of U6A, the end Q of another termination d type flip flop U6A；CLR termination+5V the power supply of d type flip flop U6A, the Q of d type flip flop U6A are non-
Terminate the end PR of d type flip flop U8A；One end of capacitor C12 is connected with one end of the non-inverting input terminal of amplifier U7 and resistance R15, electricity
Hold another input terminal of the other end of C12 as phase-comparison circuit (30), port PHASE_in2 is denoted as, with controllable frequency
The port SineM_out in source (23) is connected；The other end of resistance R15 is grounded；Positive supply termination+5V the power supply of amplifier U7, negative electricity
Source ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U6B；The port D of d type flip flop U6B is grounded；Capacitor
The one end C13 ground connection, the end PR of another termination d type flip flop U6B；Resistance R16 mono- terminates the end PR of d type flip flop U6B, another termination D
The end Q of trigger U6B；CLR termination+5V the power supply of d type flip flop U6B, the CLR of the Q non-terminated d type flip flop U8A of d type flip flop U6B
End；The end D and the end CLK of d type flip flop U8A is grounded, and output end of the end Q as phase-comparison circuit (30) is denoted as port
PHASE_out is connected with the input terminal of single-chip microcontroller (20)；
The structure in the controllable frequency source (23) is a termination+12V power supply of resistance R17, the base of another termination triode Q1
Pole；The base stage of a termination triode Q1 of resistance R18, other end ground connection；A termination+12V of resistance R19, three poles of another termination
The collector of pipe Q1；The anode of electrolytic capacitor C15 connects the collector of triode Q1, and cathode connects the base stage of triode Q2；Resistance R20
One termination triode Q1 emitter, it is another termination electrolytic capacitor C14 anode；A termination electrolytic capacitor C14 of resistance R21
Anode, the other end ground connection；The cathode of electrolytic capacitor C14 is grounded；A termination+12V power supply of resistance R22, three poles of another termination
The base stage of pipe Q2；The base stage of a termination triode Q2 of resistance R23, other end ground connection；A termination+12V power supply of resistance R24,
The collector of another termination triode Q2；The emitter of a termination triode Q2 of resistance R25, other end ground connection；Electrolytic capacitor
The anode of C16 connects the emitter of triode Q2, cathode ground connection；The anode of electrolytic capacitor C17 connects the collector of triode Q2, cathode
Connect one end of thermistor Rt1；The emitter of another termination triode Q1 of thermistor Rt1；Electrolytic capacitor C18 anode connects three
The collector of pole pipe Q2, cathode connect the pin 2 of chip U9；The pin 3 of a chip termination U9 of capacitor C19, another chip termination
The pin 2 of U10；The pin 2 of a chip termination U10 of capacitor C20, other end ground connection；The anode of electrolytic capacitor C21 connects chip
The pin 2 of U10, cathode connect the base stage of triode Q1；The pin 5 of a chip termination U9 of capacitor C22, other end ground connection；Capacitor
The pin 5 of a chip termination U10 of C23, other end ground connection；The pin 1 and pin 10 of chip U9 connects+5V power supply, pin 4 and pipe
Foot 6 is grounded；One end of 9 connecting resistance R26 of pin, one end of 8 connecting resistance R27 of pin, one end of 7 connecting resistance R28 of pin；Resistance
An input port of the other end of R26 as controllable frequency source (23), is denoted as port SineM_in1；The other end of resistance R27
As another input port of controllable frequency source (23), it is denoted as port SineM_in2；Port SineM_in1 and port
SineM_in2 is connected with the input terminal of single-chip microcontroller 18；Another termination+5V power supply of resistance R28；The pin 1 and pin of chip U10
10 connect+5V power supply, and pin 4 and pin 6 are grounded；One end of 9 connecting resistance R29 of pin, one end of 8 connecting resistance R30 of pin, pin 7
One end of connecting resistance R31；Another termination port SineM_in1 of resistance R29；Another termination port SineM_ of resistance R30
in2；Another termination+5V power supply of resistance R31；Output port of the cathode of electrolytic capacitor C18 as controllable frequency source (23), note
For SineM_out；The model of the chip U9 and chip U10 are AD5272-50.
2. a kind of high-precision optical fiber sensor based on your interference structure of Mach Zehnder according to claim 1, feature
It is, the pumping source (1) is 980nm laser light source.
3. a kind of high-precision optical fiber sensor based on your interference structure of Mach Zehnder according to claim 1 or 2, special
Sign is that the Bragg grating group (9) is made of two Bragg gratings, and the reflectivity of each grating is
90%, bandwidth is 0.6nm, and central wavelength is respectively 1550nm and 1560nm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810888834.9A CN109029517B (en) | 2018-08-07 | 2018-08-07 | A kind of high-precision optical fiber sensor based on your interference structure of Mach Zehnder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810888834.9A CN109029517B (en) | 2018-08-07 | 2018-08-07 | A kind of high-precision optical fiber sensor based on your interference structure of Mach Zehnder |
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| Publication Number | Publication Date |
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| CN109029517B true CN109029517B (en) | 2019-09-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100810145B1 (en) * | 2006-09-29 | 2008-03-06 | 전북대학교산학협력단 | Strain measurement system using double-pass mach-zehnder interferometer and fiber grating sensor |
| GB2443661B (en) * | 2006-11-08 | 2011-08-31 | Polarmetrix Ltd | Detecting a disturbance in the phase of light propogating in an optical waveguide |
| CN102564317A (en) * | 2011-12-23 | 2012-07-11 | 北京交通大学 | High-accuracy remote absolute displacement measurement system based on optical fiber composite interference |
| CN108181023A (en) * | 2017-12-27 | 2018-06-19 | 北京信息科技大学 | A kind of fiber grating and thick cone fiber optic temperature and strain measurement system and its method |
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| US7683312B2 (en) * | 2007-10-23 | 2010-03-23 | Us Sensor Systems, Inc. | Fiber-optic interrogator with normalization filters |
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|---|---|---|---|---|
| KR100810145B1 (en) * | 2006-09-29 | 2008-03-06 | 전북대학교산학협력단 | Strain measurement system using double-pass mach-zehnder interferometer and fiber grating sensor |
| GB2443661B (en) * | 2006-11-08 | 2011-08-31 | Polarmetrix Ltd | Detecting a disturbance in the phase of light propogating in an optical waveguide |
| CN102564317A (en) * | 2011-12-23 | 2012-07-11 | 北京交通大学 | High-accuracy remote absolute displacement measurement system based on optical fiber composite interference |
| CN108181023A (en) * | 2017-12-27 | 2018-06-19 | 北京信息科技大学 | A kind of fiber grating and thick cone fiber optic temperature and strain measurement system and its method |
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| 基于PZT的主动锁模光纤激光器腔长控制技术研究;高博;《中国博士学位论文全文数据库 信息科技辑》;20091215(第8期);第I135-14页 * |
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