CN109029516A - A kind of multipurpose optical fiber sensor - Google Patents
A kind of multipurpose optical fiber sensor Download PDFInfo
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- CN109029516A CN109029516A CN201810888697.9A CN201810888697A CN109029516A CN 109029516 A CN109029516 A CN 109029516A CN 201810888697 A CN201810888697 A CN 201810888697A CN 109029516 A CN109029516 A CN 109029516A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 13
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 104
- 230000003044 adaptive effect Effects 0.000 claims description 37
- 239000000919 ceramic Substances 0.000 claims description 23
- 230000003287 optical effect Effects 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 230000009466 transformation Effects 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 17
- 230000005669 field effect Effects 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims description 6
- 238000013519 translation Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims 1
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000005622 photoelectricity Effects 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 6
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000985 reflectance spectrum Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000005305 interferometry Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
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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
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Abstract
A kind of multipurpose optical fiber sensor of the invention belongs to fiber optic sensor technology field.Its primary structure has pumping source (1), light wavelength division multiplexing (2), Er-doped fiber (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 multipurpose 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 multipurpose optical fiber sensor number as PZT driving signal, so as to avoid the generation of high-frequency interferencing signal, and is being docked
Without using filter when the signal received is handled, the influence that phase is generated so as to avoid filtering.
The purpose of the present invention is achieved through the following technical solutions:
A kind of multipurpose optical fiber sensor, structure have, and pumping source 1 is connected with the end 980nm of light wavelength division multiplexing 2, light
The end 1550nm of wavelength division multiplexer 2 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 11 is connected with the input terminal of the first optoisolator 10, the control terminal of the first piezoelectric ceramics 11 and the
The output port of one PZT driving circuit 12 is connected, the output of the input terminal and D/A converting circuit 13 of the first PZT driving circuit 12
Port is connected, and the input port of D/A converting circuit 13 is connected with single-chip microcontroller 18；The output end and light of first optoisolator 10 are filtered
The light input end of wave device 9 is connected, and the electric control end of optical filter 9 is connected with single-chip microcontroller 18, the light output end and light of optical filter 9
The first port of circulator 7 is connected, and the second port of optical circulator 7 is connected with one end of Bragg grating group 8, optical circulator 7
Third port be connected with the input terminal of the first photo-coupler 5,90% output end and the second optoisolator of the first photo-coupler 5
4 input terminal is connected, and the output end of the second optoisolator 4 is connected with one end of Er-doped fiber 3, the other end of Er-doped fiber 3 and
The common end of light wavelength division multiplexing 2 is connected；The input of 10% the output end output and the second photo-coupler 6 of first photo-coupler 5
End is connected, and an output end of the second photo-coupler 6 is connected with an input terminal of third photo-coupler 24, the second photo-coupler
6 another output is connected with the one end for the optical fiber being wrapped on the second piezoelectric ceramics 23, is wrapped in the second piezoelectric ceramics 23
On the other end of optical fiber be connected with another input terminal of third photo-coupler 24, the output end and light of third photo-coupler 24
The input terminal of power conversion circuit 25 is connected；
It is characterized in that, structure in addition, the output end and function translation circuit 26 of photoelectric conversion circuit 25 input terminal phase
Even, the output end of functional transformation circuit 26 is connected with an input terminal of adaptive amplitude normalizing circuit 27, reference voltage circuit
29 output end is connected with another input terminal of adaptive amplitude normalizing circuit 27, the output of adaptive amplitude normalizing circuit 27
End is connected with an input terminal of phase-comparison circuit 28；The frequency output terminal in controllable frequency source 21 is connected with single-chip microcontroller 18, letter
Number output end is connected with another input terminal of phase-comparison circuit 28, is also connected with the input terminal of the 2nd PZT driving circuit 22,
The output end of phase-comparison circuit 28 is connected with single-chip microcontroller 18, the output end and the second piezoelectric ceramics of the 2nd PZT driving circuit 22
23 control terminal is connected；The output end of constant-current source circuit 15 is connected with thermistor 16, thermistor 16 and analog to digital conversion circuit
17 input terminal is connected, and the output end of analog to digital conversion circuit 17 is connected with single-chip microcontroller 18；Single-chip microcontroller 18 also respectively with input key
14, serial communication modular 19, display screen 20 are connected；
The structure of the functional transformation circuit 26 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 26 is denoted as port ACOS_in, with
The output end of photoelectric conversion circuit 25 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；Trigonometric function
The pin 6 of converter U1 is connected with pin 7, and pin 16 is connected with one end of+12V power supply and capacitor C1, the other end of capacitor C1
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 and electricity
The one end for hindering R1 is connected, and the other end of resistance R1 is connected with the pin 14 of trigonometric function converter U1, the cunning of slide rheostat W1
Output end of the moved end as functional transformation circuit 26, is denoted as port ACOS_out, the input with adaptive amplitude normalizing circuit 27
End is connected；The model AD639 of the trigonometric function converter U1；
The structure of the adaptive amplitude normalizing circuit 27 is one end of capacitor C11 and one end of resistance R21 and chip
The pin 3 of U2 is connected, and the other end ground connection of resistance R21, the other end of capacitor C11 is as the defeated of adaptive amplitude normalizing circuit 27
Enter end, be denoted as port ADAPT_in, the port ACOS_out of and function translation circuit 26 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 R20 and resistance R19, the other end of resistance R20 ground connection, the other end of resistance R19 is defeated with amplifier U8's
One end of outlet and resistance R17 are connected, the positive supply termination+5V power supply of amplifier U8, negative power end ground connection；Resistance R17's is another
End is connected with one end of one end of resistance R15 and resistance R16, and is connected to the inverting input terminal of amplifier U8；Amplifier U8's is same mutually defeated
Enter end to be connected with one end of resistance R18, the other end of resistance R18 is connected with+2.5V power supply；The other end and capacitor of resistance R15
One end of C10 is connected, and is connected to the output end of amplifier U7；Positive supply termination+5V the power supply of amplifier U7, negative power end ground connection；Electricity
The other end for holding C10 is connected with one end of slide rheostat W3 and sliding end, and is connected to the inverting input terminal of amplifier U7；Amplifier U7
Non-inverting input terminal be connected with one end of resistance R14, the other end of resistance R14 is connected with+2.5V power supply；Slide rheostat W3's
The other end is connected with one end of resistance R13；The output of the other end of resistance R16 and the sliding end of slide rheostat W2 and amplifier U6
End is connected, and one end of slide rheostat W2 is connected with one end of resistance R11；One end phase of the other end of resistance R11 and resistance R10
Even, and it is connected to the inverting input terminal of amplifier U6；Positive supply termination+5V the power supply of amplifier U6, negative power end ground connection；Amplifier U6's is same
Phase input terminal is connected with one end of resistance R12, and the other end of resistance R12 is connected with+2.5V power supply；The other end of resistance R10 with
The other end of resistance R13 and one end of resistance R7 are connected, and are connected to the output end of amplifier U5；The other end and resistance R6 of resistance R7
One end be connected, and be connected to the inverting input terminal of amplifier U5；The output end of another termination amplifier U4 of resistance R6, amplifier U5 is just
Power supply termination+5V power supply, negative power end ground connection；One end of resistance R8 is connected with one end of resistance R9, and is connected to the same of amplifier U5
The other end of phase input terminal, resistance R9 is connected with+2.5V power supply；The other end of resistance R8 is as adaptive amplitude normalizing circuit 27
Reference voltage end, be connected with the reference voltage output terminal of reference voltage circuit 29；The pin 10 of chip U2 is used as adaptive width
The output end for spending normalizing circuit 27, is denoted as port ADAPT_out, is connected with an input terminal of phase-comparison circuit 28；Chip
The pin 10 of U2 is connected with one end of capacitor C7, the homophase input of the other end of capacitor C7 and one end of resistance R22 and amplifier U3
End is connected, the other end ground connection of resistance R22；One end of resistance R3 is connected with the anode of one end of capacitor C8 and diode D1, and
It is connected to the inverting input terminal of amplifier U3, the substrate (i.e. pin 8) of amplifier U3 is connected to the inverting input terminal of amplifier U3；Amplifier U3 is just
Power supply termination+5V power supply, negative supply termination -5V power supply；The other end of capacitor C8 and the cathode of diode D1 and diode D2's
Anode is connected, and is connected to the output end of amplifier U3；The anti-phase input of the other end of resistance R3 and one end of resistance R4 and amplifier U4
End is connected, and the other end of resistance R4 is connected with the grid of the cathode of diode D2 and field-effect tube Q1, the source electrode of field-effect tube Q1
It is connected with one end of one end of capacitor C9 and resistance R5, the other end of capacitor C9 is connected and is grounded with the other end of resistance R5；?
The source electrode of effect pipe Q1 is connected with the drain electrode of field-effect tube Q1, and is connected to the non-inverting input terminal of amplifier U4；The reverse phase of amplifier U4 is defeated
Enter end to be connected with the output end of the substrate of amplifier U4 and amplifier U4；Positive supply termination+5V the power supply of amplifier U3, negative supply termination-
5V power supply；The chip U2 is variable gain amplifier chip, and model is AD8367；
The structure of the phase-comparison circuit 28 is one end of capacitor C12 and the non-inverting input terminal and resistance of amplifier U9
One end of R23 is connected, and an input terminal of the other end of capacitor C12 as phase-comparison circuit 28 is denoted as port PHASE_
In1 is connected with the port ADAPT_out of adaptive amplitude normalizing circuit 27；The other end of resistance R23 is grounded；Amplifier U9 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 U10A；D triggering
The port D of device U10A is grounded；The one end capacitor C13 ground connection, the end PR of another termination d type flip flop U10A；Resistance R24 mono- terminates D touching
Send out the end PR of device U10A, the end Q of another termination d type flip flop U10A；CLR termination+5V the power supply of d type flip flop U10A, d type flip flop
The end PR of the Q non-terminated d type flip flop U12A of U10A；One end of capacitor C14 and the non-inverting input terminal of amplifier U11 and resistance R25's
One end is connected, another input terminal of the other end of capacitor C12 as phase-comparison circuit 28 is denoted as port PHASE_in2, with
The port SineM_out in controllable frequency source 21 is connected；The other end of resistance R25 is grounded；Positive supply termination+5V the electricity of amplifier U11
Source, negative power end ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U10B；The port D of d type flip flop U10B
Ground connection；The one end capacitor C15 ground connection, the end PR of another termination d type flip flop U10B；The PR of the termination of resistance R26 mono- d type flip flop U10B
End, the end Q of another termination d type flip flop U10B；CLR termination+5V the power supply of d type flip flop U10B, the Q non-terminated D of d type flip flop U10B
The end CLR of trigger U12A；The end D and the end CLK of d type flip flop U12A is grounded, output of the end Q as phase-comparison circuit 28
End, is denoted as port PHASE_out；
The structure of the reference voltage circuit 29 is a termination+5V power supply of resistance R27, another termination amplifier U13's
Non-inverting input terminal, the plus earth of zener diode D3, cathode connect amplifier U13 non-inverting input terminal, the inverting input terminal of amplifier U13
It is connected with output end, positive supply termination+5V power supply, negative power end ground connection, output end is+2.5V power supply ,+the 2.5V in each module
Power supply is provided by the output end；A termination+2.5V power supply of slide rheostat W4, other end ground connection, sliding termination amplifier U14
Non-inverting input terminal；The anti-phase input of amplifier U14 terminates its output end, and positive supply termination+5V power supply, negative power end is grounded, defeated
Output end of the outlet as reference voltage circuit 29, is denoted as port Vref, the reference voltage with adaptive amplitude normalizing circuit 27
End is connected；
The structure in the controllable frequency source 21 is the non-inverting input terminal of a termination amplifier U15 of resistance R33, the other end
Ground connection；The non-inverting input terminal of a termination amplifier U15 of capacitor C20, signal output end of the other end as controllable frequency source 21, note
For port SinM_out, with the port PHASE_in2 of phase-comparison circuit 28 and the input terminal phase of the 2nd PZT driving circuit 22
Even；The inverting input terminal of a termination amplifier U15 of resistance R32, other end ground connection；Positive supply termination+5V the power supply of amplifier U15,
Negative power end ground connection, frequency output terminal of the output end as controllable frequency source 21 is denoted as port FrqM_out, with 18 phase of single-chip microcontroller
Even；A termination+12V power supply of resistance R28, the base stage of another termination triode Q2；A termination+12V power supply of resistance R30, separately
The collector of one termination triode Q2；The base stage of a termination triode Q2 of capacitor C19, another termination electrolytic capacitor C18's is negative
Pole；The anode of electrolytic capacitor C18 connects the emitter of triode Q2；The base stage of a termination triode Q2 of resistance R29, another termination
Ground；Resistance R31 mono- terminates the emitter of triode Q2, other end ground connection；The emitter of a termination triode Q2 of capacitor C16,
Other end ground connection；The anode of electrolytic capacitor C17 connects the collector of triode Q2, and cathode connects the emitter of triode Q2；Adjustable electric
Feel the collector of a termination triode Q2 of L1, the cathode of another termination electrolytic capacitor C18；The collector of triode Q2 connects port
SinM_out。
The preferred 980nm laser light source of pumping source 1.
The Bragg grating group 8 is preferably made of 3 Bragg gratings, and the reflectivity of each grating is 90%,
Bandwidth is 0.6nm, and central wavelength is respectively 1550nm, 1560nm and 1630nm.
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 for the reference voltage circuit that the present invention uses.
Fig. 6 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 (980nm laser, peak power output 1W) with
The end 980nm of light wavelength division multiplexing 2 (980/1550nm wavelength division multiplexer) is connected, the end 1550nm of light wavelength division multiplexing 2 with twine
It is wound on one end phase of the optical fiber on the first piezoelectric ceramics 11 (cylindrical piezoelectric ceramics, outer diameter 50m m, internal diameter 40mm, high 50mm)
Even, it is wrapped in (the unrelated optical isolation of 1550nm polarization of the other end of the optical fiber on the first piezoelectric ceramics 11 and the first optoisolator 10
Device) input terminal be connected, the control terminal of the first piezoelectric ceramics 11 and the first PZT driving circuit 12 (the homemade device of this seminar,
Specific structure is shown in patent ZL200710055865.8) output port be connected, the input terminal and digital-to-analogue of the first PZT driving circuit 12
The output port of conversion circuit 13 is connected, input port and single-chip microcontroller 18 (STC89C51 single-chip microcontroller) phase of D/A converting circuit 13
Even；(Micron Optics company produces the output end and optical filter 9 of first optoisolator 10, model FFP-TF-1060-
Light input end 010G0200-2.0) is connected, and the electric control end of optical filter 9 is connected with single-chip microcontroller 18, and the light of optical filter 9 is defeated
Outlet is connected with the first port of optical circulator 7 (PIOC3-158 of THO RLABS company production), the second end of optical circulator 7
Mouthful with Bragg grating group 8 (reflectivity is 90%, and bandwidth is 0.6nm, and central wavelength is respectively 1550nm, 1560nm,
Three Bragg gratings of 1630nm) one end be connected, the third port of optical circulator 7 and 5 (OZ- of the first photo-coupler
OPTICS company production, model FUSED-12-1064-7/125-90/10-3U-3mm, splitting ratio 90:10) input terminal
It is connected, the input terminal of 90% output end of the first photo-coupler 5 and the second optoisolator 4 (1550nm polarization independent optical isolator)
It is connected, output end and Er-doped fiber 3 (the SM-ESF-7/125 er-doped light of Nufern company of U.S. production of the second optoisolator 4
It is fine) one end be connected, the other end of Er-doped fiber 3 is connected with the common end of light wavelength division multiplexing 2.Above structure constitutes optical fiber
The basic luminaire part of sensor and transducing part.The output of 10% output end and the second photo-coupler 6 (1 of first photo-coupler 5
× 2 standard single mode photo-couplers, splitting ratio 50:50) input terminal be connected, an output end of the second photo-coupler 6 and the
One input terminal of three photo-couplers 24 (1 × 2 standard single mode photo-coupler, splitting ratio 50:50) is connected, the second photo-coupler
(cylindrical piezoelectric ceramics, outer diameter 50mm, internal diameter 40mm are high with the second piezoelectric ceramics 23 is wrapped in for 6 another output
One end of optical fiber on 50mm) is connected, and is wrapped in the other end and third photo-coupler 24 of the optical fiber on the second piezoelectric ceramics 23
Another input terminal be connected, the output end of third photo-coupler 24 is connected with the input terminal of photoelectric conversion circuit 25.Above-mentioned
Two photo-couplers 6, third photo-coupler 24 and the second piezoelectric ceramics 23 collectively constitute Mach Zehnder that interference structure.
Structure of the invention in addition, the input terminal of the output end and function translation circuit 26 of photoelectric conversion circuit 25 is connected,
The output end of functional transformation circuit 26 is connected with an input terminal of adaptive amplitude normalizing circuit 27, reference voltage circuit 29
Output end is connected with another input terminal of adaptive amplitude normalizing circuit 27, the output end of adaptive amplitude normalizing circuit 27 with
One input terminal of phase-comparison circuit 28 is connected；The frequency output terminal in controllable frequency source 21 is connected with single-chip microcontroller 18, and signal is defeated
Outlet is connected with another input terminal of phase-comparison circuit 28, also with 22 (the homemade dress of this seminar of the 2nd PZT driving circuit
Set, specific structure is shown in patent ZL200710055865.8) input terminal be connected, the output end and single-chip microcontroller of phase-comparison circuit 28
18 (STC89C51 single-chip microcontrollers) are connected, and the output end of the 2nd PZT driving circuit 22 is connected with the control terminal of the second piezoelectric ceramics 23.
Above structure constitutes the demodulation part of sensor.The output end of constant-current source circuit 15 and thermistor 16 (25 DEG C of 10k Ω@) phase
Even, thermistor 16 is connected with the input terminal of analog to digital conversion circuit 17, output end and 18 phase of single-chip microcontroller of analog to digital conversion circuit 17
Even.Above structure is that the present invention provides temperature compensation functions.Single-chip microcontroller 18 also respectively with input key 14, serial communication modular
(19MAX232), display screen 20 are connected, for parameter to be arranged, the functions such as information are communicated and shown with computer.
2 functional transformation circuit of embodiment
As shown in Fig. 2, the structure of functional transformation circuit 26 used in the present invention is one end of capacitor C3 and trigonometric function
The pin 12 of converter U1 and one end of resistance R2 are connected, input terminal of the other end of capacitor C3 as functional transformation circuit 26,
It is denoted as port ACOS_in, is connected with the output end of photoelectric conversion circuit 25；The other end of resistance R2 is grounded；Trigonometric function conversion
The pin 2,3,4,5,8,11,13 of device U1 is grounded, and pin 9,10 is connected with one end of capacitor C2 and -12V power supply, and capacitor C2's is another
One end ground connection；The pin 6 of trigonometric function converter U1 is connected with pin 7, one end phase of pin 16 and+12V power supply and capacitor C1
Even, the other end ground connection of capacitor C1；The pin 1 of trigonometric function converter U1 is connected with the sliding end of slide rheostat W1, sliding
One end of rheostat W1 is connected with one end of resistance R1,14 phase of pin of the other end and trigonometric function converter U1 of resistance R1
Even, output end of the sliding end of slide rheostat W1 as functional transformation circuit 26 is denoted as port ACOS_out, with adaptive width
The input terminal for spending normalizing circuit 27 is connected；The model AD639 of the trigonometric function converter U1.The circuit has anticosine
Mapping function, the signal that photoelectric conversion circuit 25 is exported carry out anticosine processing.
The adaptive amplitude normalizing circuit of embodiment 3
Since the signal amplitude that functional transformation circuit 26 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 27, for the signal for exporting functional transformation circuit 26
Amplitude normalization at best size, to further increase the precision of demodulation.Specific structure is one end of capacitor C11 and resistance
One end of R21 and the pin 3 of chip U2 are connected, and the other end ground connection of resistance R21, the other end of capacitor C11 is as adaptive width
The input terminal for spending normalizing circuit 27, is denoted as port ADAPT_in, and the port ACOS_out of and function translation circuit 26 is connected；Chip
Pin 1, pin 7, pin 8, the pin 14 of U2 is grounded, and pin 2 is connected with+5V power supply with pin 4, pin 11 and pin 12
It is connected and is connected with one end of capacitor C5 and+5V power supply, the other end ground connection of capacitor C5；The pin 13 of chip U2 is with capacitor C4's
One end is connected, the other end ground connection of capacitor C4；The pin 9 of chip U2 is connected with one end of capacitor C6, another termination of capacitor C6
Ground；The pin 5 of chip U2 is connected with one end of resistance R20 and resistance R19, and the other end ground connection of resistance R20, resistance R19's is another
One end is connected with one end of the output end of amplifier U8 and resistance R17, the positive supply termination+5V power supply of amplifier U8, negative supply termination
Ground；The other end of resistance R17 is connected with one end of one end of resistance R15 and resistance R16, and is connected to the anti-phase input of amplifier U8
End；The non-inverting input terminal of amplifier U8 is connected with one end of resistance R18, and the other end of resistance R18 is connected with+2.5V power supply；Resistance
The other end of R15 is connected with one end of capacitor C10, and is connected to the output end of amplifier U7；Positive supply termination+5V the electricity of amplifier U7
Source, negative power end ground connection；The other end of capacitor C10 is connected with one end of slide rheostat W3 and sliding end, and is connected to amplifier U7
Inverting input terminal；The non-inverting input terminal of amplifier U7 is connected with one end of resistance R14, the other end and+2.5V power supply of resistance R14
It is connected；The other end of slide rheostat W3 is connected with one end of resistance R13；The other end of resistance R16 is with slide rheostat W2's
The output end of sliding end and amplifier U6 are connected, and one end of slide rheostat W2 is connected with one end of resistance R11；Resistance R11's is another
One end is connected with one end of resistance R10, and is connected to the inverting input terminal of amplifier U6；Positive supply termination+5V the power supply of amplifier U6 is born
Power end ground connection；The non-inverting input terminal of amplifier U6 is connected with one end of resistance R12, the other end and the+2.5V power supply phase of resistance R12
Even；The other end of resistance R10 is connected with one end of the other end of resistance R13 and resistance R7, and is connected to the output end of amplifier U5；Electricity
The other end of resistance R7 is connected with one end of resistance R6, and is connected to the inverting input terminal of amplifier U5；Another termination amplifier of resistance R6
The output end of U4, the positive supply termination+5V power supply of amplifier U5, negative power end ground connection；One end of resistance R8 and one end of resistance R9
It is connected, and is connected to the non-inverting input terminal of amplifier U5, the other end of resistance R9 is connected with+2.5V power supply；The other end of resistance R8 is made
For the reference voltage end of adaptive amplitude normalizing circuit 27, it is connected with the reference voltage output terminal of reference voltage circuit 29；Chip
Output end of the pin 10 of U2 as adaptive amplitude normalizing circuit 27, is denoted as port ADAPT_out, with phase-comparison circuit 28
An input terminal be connected；The pin 10 of chip U2 is connected with one end of capacitor C7, the other end of capacitor C7 and the one of resistance R22
The non-inverting input terminal of end and amplifier U3 are connected, the other end ground connection of resistance R22；One end of resistance R3 and one end and two of capacitor C8
The anode of pole pipe D1 is connected, and is connected to the inverting input terminal of amplifier U3, and the substrate (i.e. pin 8) of amplifier U3 is connected to the anti-of amplifier U3
Phase input terminal；Positive supply termination+5V the power supply of amplifier U3, negative supply termination -5V power supply；The other end and diode D1 of capacitor C8
Cathode and the anode of diode D2 be connected, and be connected to the output end of amplifier U3；The other end of resistance R3 and one end of resistance R4
And the inverting input terminal of amplifier U4 is connected, the grid phase of the other end of resistance R4 and the cathode of diode D2 and field-effect tube Q1
Even, the source electrode of field-effect tube Q1 is connected with one end of one end of capacitor C9 and resistance R5, and the other end of capacitor C9 is with resistance R5's
The other end is connected and is grounded；The source electrode of field-effect tube Q1 is connected with the drain electrode of field-effect tube Q1, and is connected to the same mutually defeated of amplifier U4
Enter end；The inverting input terminal of amplifier U4 is connected with the output end of the substrate of amplifier U4 and amplifier U4；The positive supply termination of amplifier U3+
5V power supply, negative supply termination -5V power supply；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 phase-comparison circuit 28 that the present invention uses is, one end of capacitor C12 is with amplifier U9's
One end of non-inverting input terminal and resistance R23 are connected, an input terminal of the other end of capacitor C12 as phase-comparison circuit 28,
It is denoted as port PHASE_in1, is connected with the port ADAPT_out of adaptive amplitude normalizing circuit 27；Another termination of resistance R23
Ground；Positive supply termination+5V the power supply of amplifier U9, negative power end ground connection, reverse inter-input-ing ending grounding, output termination d type flip flop U10A
The end CLK；The port D of d type flip flop U10A is grounded；The one end capacitor C13 ground connection, the end PR of another termination d type flip flop U10A；Resistance
R24 mono- terminates the end PR of d type flip flop U10A, the end Q of another termination d type flip flop U10A；CLR termination+5V the electricity of d type flip flop U10A
Source, the end PR of the Q non-terminated d type flip flop U12A of d type flip flop U10A；One end of capacitor C14 and the non-inverting input terminal of amplifier U11 and
One end of resistance R25 is connected, another input terminal of the other end of capacitor C12 as phase-comparison circuit 28 is denoted as port
PHASE_in2 is connected with the port SineM_out in controllable frequency source 21；The other end of resistance R25 is grounded；The positive electricity of amplifier U11
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 U10B；D type flip flop
The port D of U10B is grounded；The one end capacitor C15 ground connection, the end PR of another termination d type flip flop U10B；Resistance R26 mono- terminates D triggering
The end PR of device U10B, the end Q of another termination d type flip flop U10B；CLR termination+5V the power supply of d type flip flop U10B, d type flip flop U10B
Q non-terminated d type flip flop U12A the end CLR；The end D and the end CLK of d type flip flop U12A is grounded, and the end Q is as phase-comparison circuit
28 output end is denoted as port PHASE_out.The standard sine wave and adaptive amplitude that the circuit exports controllable frequency source 21
The sine wave (environment that its phase is detected by Bragg grating group 8 is influenced) of 27 circuit output of normalizing carries out phase bit comparison, and
Comparison result is sent into single-chip microcontroller 18, single-chip microcontroller calculates the measured physical quantity at Bragg grating group 8 according to the phase differential
The variation of (stress, temperature etc.).
5 reference voltage circuit of embodiment
The structure of the reference voltage circuit 29 is a termination+5V power supply of resistance R27, another termination amplifier U13's
Non-inverting input terminal, the plus earth of zener diode D3, cathode connect amplifier U13 non-inverting input terminal, the inverting input terminal of amplifier U13
It is connected with output end, positive supply termination+5V power supply, negative power end ground connection, output end is+2.5V power supply ,+the 2.5V in each module
Power supply is provided by the output end；A termination+2.5V power supply of slide rheostat W4, other end ground connection, sliding termination amplifier U14
Non-inverting input terminal；The anti-phase input of amplifier U14 terminates its output end, and positive supply termination+5V power supply, negative power end is grounded, defeated
Output end of the outlet as reference voltage circuit 29, is denoted as port Vref, the reference voltage with adaptive amplitude normalizing circuit 27
End is connected, and reference voltage is provided for adaptive amplitude normalizing circuit 27, to control the output of adaptive amplitude normalizing circuit 27 just
The amplitude of string wave.
6 controllable frequency source of embodiment
As shown in fig. 6, the structure in controllable frequency source 21 used in the present invention is, a termination amplifier U15's of resistance R33
Non-inverting input terminal, other end ground connection；The non-inverting input terminal of a termination amplifier U15 of capacitor C20, the other end is as controllable frequency source
21 signal output end is denoted as port SinM_out, drives with the port PHASE_in2 and the 2nd PZT of phase-comparison circuit 28
The input terminal of dynamic circuit 22 is connected；The inverting input terminal of a termination amplifier U15 of resistance R32, other end ground connection；Amplifier U15's
Positive supply termination+5V power supply, negative power end ground connection, frequency output terminal of the output end as controllable frequency source 21 are denoted as port
FrqM_out is connected with single-chip microcontroller 18；A termination+12V power supply of resistance R28, the base stage of another termination triode Q2；Resistance
A termination+12V power supply of R30, the collector of another termination triode Q2；The base stage of a termination triode Q2 of capacitor C19, separately
The cathode of one termination electrolytic capacitor C18；The anode of electrolytic capacitor C18 connects the emitter of triode Q2；A termination three of resistance R29
The base stage of pole pipe Q2, other end ground connection；Resistance R31 mono- terminates the emitter of triode Q2, other end ground connection；The one of capacitor C16
Terminate the emitter of triode Q2, other end ground connection；The anode of electrolytic capacitor C17 connects the collector of triode Q2, and cathode connects three
The emitter of pole pipe Q2；The collector of a termination triode Q2 of controllable impedance L1, the cathode of another termination electrolytic capacitor C18；
The collector of triode Q2 meets port SinM_out.The adjustable standard sine wave of module output frequency is demodulation of the invention
Part provides required sinusoidal signal.
7 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 8 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 3, optoisolator 4 etc. form
8 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 changes, the reflectance spectrum peak wavelength of the bragg grating at this
It can occur to deviate accordingly, reflected light enters to be made of the second photo-coupler 6, the second piezoelectric ceramics 23, third photo-coupler 24
Mach Zehnder your interferometer in, while controllable frequency source 21 is that Mach Zehnder that interferometer provides a control signal sin (ω
T), which is influenced in interferometer by the light that bragg grating reflects, then is converted into electricity through photoelectric conversion circuit 25
Signal simultaneously obtains sin (ω t+ Δ θ) later by the anti-cosine transform of functional transformation circuit 26, and the signal is through adaptive amplitude normalizing
27 amplitude of circuit is adjusted to a suitable size (being controlled by reference voltage circuit 29), signal and controllable frequency at this time
Source 21 generates sinusoidal signal sin (ω t) and compares, and phase is changed, by phase-comparison circuit 28 by the phase difference of the two
It detected and be sent into single-chip microcontroller 18, the phase difference real reaction variation of the measured physical quantity of measured point finally realizes
Monitoring to measured point.The present invention is no during modulation and demodulation to use sawtooth wave, so as to avoid sawtooth wave failing edge
Bring high-frequency jitter signal is also avoided there is no need to use bandpass filter to be filtered to output in demodulator circuit
The amplitude-frequency characteristic and phase-frequency characteristic of signal have an impact.The present invention is using standard sine wave signal as PZT modulated signal, right
When modulated signal is demodulated, functional transformation circuit 26 and adaptive amplitude normalizing circuit 27 are dexterously used, it will be brewed
Signal recovers phase is controlled by the Bragg grating group 8 and suitable sinusoidal signal of amplitude, so that in phase-comparison circuit 28
When middle progress phase bit comparison, the phase difference of controlled signal and original signal can be highly precisely compared, thus accurately anti-
The environmental parameter that inductive sensing head (i.e. Bragg grating group 8) is detected.
Since optical fiber laser annular chamber (is generally sensed with bragg grating group 8 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, by constant-current source circuit 15, temperature-sensitive electricity
Resistance 16, analog to digital conversion circuit 17 are constituted.It can cause the change in resistance of thermistor 16, constant-current source circuit when the environmental temperature is changed
15 provide constant current for it, therefore the variation of 16 resistance value of thermistor can cause the variation of its both end voltage, through analog to digital conversion circuit
17 are converted into digital signal input single-chip microcontroller 18, and the variation for environment temperature locating for compensated optical fiber laser annular chamber is to survey
Measure result bring error.
Claims (3)
1. a kind of multipurpose optical fiber sensor, structure have, pumping source (1) is connected with the end 980nm of light wavelength division multiplexing (2),
The end 1550nm of light wavelength division multiplexing (2) 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 one piezoelectric ceramics (11) is connected with the input terminal of the first optoisolator (10), the first piezoelectric ceramics (11)
Control terminal be connected with the output port of the first PZT driving circuit (12), the input terminal and digital-to-analogue of the first PZT driving circuit (12)
The output port of conversion circuit (13) is connected, and the input port of D/A converting circuit (13) is connected with single-chip microcontroller (18)；First light
The output end of isolator (10) is connected with the light input end of optical filter (9), the electric control end of optical filter (9) and single-chip microcontroller
(18) it is connected, the light output end of optical filter (9) is connected with the first port of optical circulator (7), the second end of optical circulator (7)
Mouth is connected with one end of Bragg grating group (8), the third port of optical circulator (7) and the input terminal of the first photo-coupler (5)
It is connected, 90% output end of the first photo-coupler (5) is connected with the input terminal of the second optoisolator (4), the second optoisolator (4)
Output end be connected with one end of Er-doped fiber (3), the common end of the other end of Er-doped fiber (3) and light wavelength division multiplexing (2)
It is connected；The 10% output end output of first photo-coupler (5) is connected with the input terminal of the second photo-coupler (6), the second optical coupling
One output end of device (6) is connected with an input terminal of third photo-coupler (24), and another of the second photo-coupler (6) is defeated
Outlet is connected with the one end for the optical fiber being wrapped on the second piezoelectric ceramics (23), the optical fiber being wrapped on the second piezoelectric ceramics (23)
The other end be connected with another input terminal of third photo-coupler (24), the output end of third photo-coupler (24) and photoelectricity turn
The input terminal for changing circuit (25) is connected；
It is characterized in that, structure in addition, the output end and function translation circuit (26) of photoelectric conversion circuit (25) input terminal phase
Even, the output end of functional transformation circuit (26) is connected with an input terminal of adaptive amplitude normalizing circuit (27), reference voltage
The output end of circuit (29) is connected with another input terminal of adaptive amplitude normalizing circuit (27), adaptive amplitude normalizing circuit
(27) output end is connected with an input terminal of phase-comparison circuit (28)；The frequency output terminal and list in controllable frequency source (21)
Piece machine (18) is connected, and signal output end is connected with another input terminal of phase-comparison circuit (28), also drives electricity with the 2nd PZT
The input terminal on road (22) is connected, and the output end of phase-comparison circuit (28) is connected with single-chip microcontroller (18), the 2nd PZT driving circuit
(22) output end is connected with the control terminal of the second piezoelectric ceramics (23)；The output end and thermistor of constant-current source circuit (15)
(16) it is connected, thermistor (16) is connected with the input terminal of analog to digital conversion circuit (17), the output end of analog to digital conversion circuit (17)
It is connected with single-chip microcontroller (18)；Single-chip microcontroller (18) also respectively with input key (14), serial communication modular (19), display screen (20) phase
Even；
The structure of the functional transformation circuit (26) 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 (26) is denoted as port ACOS_in, with
The output end of photoelectric conversion circuit (25) 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 letter
The pin 6 of number 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
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 with
One end of resistance R1 is connected, and the other end of resistance R1 is connected with the pin 14 of trigonometric function converter U1, slide rheostat W1's
Output end of the sliding end as functional transformation circuit (26), is denoted as port ACOS_out, with adaptive amplitude normalizing circuit (27)
Input terminal be connected；The model AD639 of the trigonometric function converter U1；
The structure of the adaptive amplitude normalizing circuit (27) is one end of capacitor C11 and one end of resistance R21 and chip U2
Pin 3 be connected, the other end of resistance R21 ground connection, the other end of capacitor C11 is as the defeated of adaptive amplitude normalizing circuit (27)
Enter end, be denoted as port ADAPT_in, the port ACOS_out of and function translation circuit (26) is connected；Pin 1, the pin of chip U2
7, pin 8, pin 14 are grounded, and pin 2 is connected with+5V power supply with pin 4, pin 11 be connected with pin 12 and with capacitor C5
One end and+5V power supply be connected, the other end of capacitor C5 ground connection；The pin 13 of chip U2 is connected with one end of capacitor C4, capacitor
The other end of C4 is grounded；The pin 9 of chip U2 is connected with one end of capacitor C6, the other end ground connection of capacitor C6；The pipe of chip U2
Foot 5 is connected with one end of resistance R20 and resistance R19, and the other end ground connection of resistance R20, the other end of resistance R19 is with amplifier U8's
One end of output end and resistance R17 are connected, the positive supply termination+5V power supply of amplifier U8, negative power end ground connection；Resistance R17's is another
One end is connected with one end of one end of resistance R15 and resistance R16, and is connected to the inverting input terminal of amplifier U8；The same phase of amplifier U8
Input terminal is connected with one end of resistance R18, and the other end of resistance R18 is connected with+2.5V power supply；The other end and electricity of resistance R15
The one end for holding C10 is connected, and is connected to the output end of amplifier U7；Positive supply termination+5V the power supply of amplifier U7, negative power end ground connection；
The other end of capacitor C10 is connected with one end of slide rheostat W3 and sliding end, and is connected to the inverting input terminal of amplifier U7；Amplifier
The non-inverting input terminal of U7 is connected with one end of resistance R14, and the other end of resistance R14 is connected with+2.5V power supply；Slide rheostat W3
The other end be connected with one end of resistance R13；The sliding end of the other end of resistance R16 and slide rheostat W2 and amplifier U6's is defeated
Outlet is connected, and one end of slide rheostat W2 is connected with one end of resistance R11；The other end of resistance R11 and one end of resistance R10
It is connected, and is connected to the inverting input terminal of amplifier U6；Positive supply termination+5V the power supply of amplifier U6, negative power end ground connection；Amplifier U6's
Non-inverting input terminal is connected with one end of resistance R12, and the other end of resistance R12 is connected with+2.5V power supply；The other end of resistance R10
It is connected with one end of the other end of resistance R13 and resistance R7, and is connected to the output end of amplifier U5；The other end and resistance of resistance R7
One end of R6 is connected, and is connected to the inverting input terminal of amplifier U5；The output end of another termination amplifier U4 of resistance R6, amplifier U5's
Positive supply termination+5V power supply, negative power end ground connection；One end of resistance R8 is connected with one end of resistance R9, and is connected to amplifier U5's
The other end of non-inverting input terminal, resistance R9 is connected with+2.5V power supply；The other end of resistance R8 is as adaptive amplitude normalizing circuit
(27) reference voltage end is connected with the reference voltage output terminal of reference voltage circuit (29)；The pin 10 of chip U2 is as certainly
The output end of amplitude of adaptation normalizing circuit (27), is denoted as port ADAPT_out, an input terminal with phase-comparison circuit (28)
It is connected；The pin 10 of chip U2 is connected with one end of capacitor C7, the other end of capacitor C7 and one end of resistance R22 and amplifier U3's
Non-inverting input terminal is connected, the other end ground connection of resistance R22；The anode of one end of resistance R3 and one end of capacitor C8 and diode D1
It is connected, and is connected to the inverting input terminal of amplifier U3, the substrate (i.e. pin 8) of amplifier U3 is connected to the inverting input terminal of amplifier U3；Fortune
Put the positive supply termination+5V power supply of U3, negative supply termination -5V power supply；The other end of capacitor C8 and the cathode and two of diode D1
The anode of pole pipe D2 is connected, and is connected to the output end of amplifier U3；The other end of resistance R3 and one end of resistance R4 and amplifier U4's
Inverting input terminal is connected, and the other end of resistance R4 is connected with the grid of the cathode of diode D2 and field-effect tube Q1, field-effect tube
The source electrode of Q1 is connected with one end of one end of capacitor C9 and resistance R5, and the other end of capacitor C9 is connected simultaneously with the other end of resistance R5
Ground connection；The source electrode of field-effect tube Q1 is connected with the drain electrode of field-effect tube Q1, and is connected to the non-inverting input terminal of amplifier U4；Amplifier U4's
Inverting input terminal is connected with the output end of the substrate of amplifier U4 and amplifier U4；Positive supply termination+5V the power supply of amplifier U3, negative supply
Termination -5V power supply；The chip U2 is variable gain amplifier chip, and model is AD8367；
The structure of the phase-comparison circuit (28) is one end of capacitor C12 and the non-inverting input terminal of amplifier U9 and resistance R23
One end be connected, an input terminal of the other end of capacitor C12 as phase-comparison circuit (28) is denoted as port PHASE_in1,
It is connected with the port ADAPT_out of adaptive amplitude normalizing circuit (27)；The other end of resistance R23 is grounded；The positive electricity of amplifier U9
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 U10A；D type flip flop
The port D of U10A is grounded；The one end capacitor C13 ground connection, the end PR of another termination d type flip flop U10A；Resistance R24 mono- terminates D triggering
The end PR of device U10A, the end Q of another termination d type flip flop U10A；CLR termination+5V the power supply of d type flip flop U10A, d type flip flop U10A
Q non-terminated d type flip flop U12A the end PR；One end of one end of capacitor C14 and the non-inverting input terminal of amplifier U11 and resistance R25
It is connected, another input terminal of the other end of capacitor C12 as phase-comparison circuit (28) is denoted as port PHASE_in2, and can
The port SineM_out for controlling frequency source (21) is connected；The other end of resistance R25 is grounded；Positive supply termination+5V the electricity of amplifier U11
Source, negative power end ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U10B；The port D of d type flip flop U10B
Ground connection；The one end capacitor C15 ground connection, the end PR of another termination d type flip flop U10B；The PR of the termination of resistance R26 mono- d type flip flop U10B
End, the end Q of another termination d type flip flop U10B；CLR termination+5V the power supply of d type flip flop U10B, the Q non-terminated D of d type flip flop U10B
The end CLR of trigger U12A；The end D and the end CLK of d type flip flop U12A is grounded, output of the end Q as phase-comparison circuit (28)
End, is denoted as port PHASE_out；
The structure of the reference voltage circuit (29) is a termination+5V power supply of resistance R27, and another termination amplifier U13's is same
Phase input terminal, the plus earth of zener diode D3, cathode connect amplifier U13 non-inverting input terminal, the inverting input terminal of amplifier U13 with
Output end is connected, positive supply termination+5V power supply, and negative power end ground connection, output end is+2.5V power supply ,+2.5V the electricity in each module
Source is provided by the output end；A termination+2.5V power supply of slide rheostat W4, other end ground connection, sliding termination amplifier U14's
Non-inverting input terminal；The anti-phase input of amplifier U14 terminates its output end, positive supply termination+5V power supply, negative power end ground connection, output
The output end as reference voltage circuit (29) is held, port Vref is denoted as, the reference electricity with adaptive amplitude normalizing circuit (27)
Pressure side is connected；
The structure in the controllable frequency source (21) is the non-inverting input terminal of a termination amplifier U15 of resistance R33, another termination
Ground；The non-inverting input terminal of a termination amplifier U15 of capacitor C20, signal output end of the other end as controllable frequency source (21), note
Input for port SinM_out, with the port PHASE_in2 and the 2nd PZT driving circuit (22) of phase-comparison circuit (28)
End is connected；The inverting input terminal of a termination amplifier U15 of resistance R32, other end ground connection；Positive supply termination+5V the electricity of amplifier U15
Source, negative power end ground connection, frequency output terminal of the output end as controllable frequency source (21) are denoted as port FrqM_out, with monolithic
Machine (18) is connected；A termination+12V power supply of resistance R28, the base stage of another termination triode Q2；A termination+12V of resistance R30
Power supply, the collector of another termination triode Q2；The base stage of a termination triode Q2 of capacitor C19, another termination electrolytic capacitor
The cathode of C18；The anode of electrolytic capacitor C18 connects the emitter of triode Q2；The base stage of a termination triode Q2 of resistance R29,
Other end ground connection；Resistance R31 mono- terminates the emitter of triode Q2, other end ground connection；A termination triode Q2's of capacitor C16
Emitter, other end ground connection；The anode of electrolytic capacitor C17 connects the collector of triode Q2, and cathode connects the emitter of triode Q2；
The collector of a termination triode Q2 of controllable impedance L1, the cathode of another termination electrolytic capacitor C18；The collector of triode Q2
Meet port SinM_out.
2. a kind of multipurpose optical fiber sensor according to claim 1, which is characterized in that the pumping source (1) is
980nm laser light source.
3. a kind of multipurpose optical fiber sensor according to claim 1 or 2, which is characterized in that the Bragg grating
Group 8 is made of 3 Bragg gratings, and the reflectivity of each grating is 90%, and bandwidth is 0.6nm, central wavelength point
It Wei not 1550nm, 1560nm and 1630nm.
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| CN113204256A (en) * | 2021-04-30 | 2021-08-03 | 国家石油天然气管网集团有限公司华南分公司 | Photoelectric conversion circuit of intelligent interface inspection tester and temperature control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US20110255078A1 (en) * | 2007-10-23 | 2011-10-20 | Us Sensor Systems, Inc. | Interrogator for a plurality of sensor fiber optic gratings |
| 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 |
-
2018
- 2018-08-07 CN CN201810888697.9A patent/CN109029516B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US20110255078A1 (en) * | 2007-10-23 | 2011-10-20 | Us Sensor Systems, Inc. | Interrogator for a plurality of sensor fiber optic gratings |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 高博: "基于PZT的主动锁模光纤激光器腔长控制技术研究", 《中国博士学位论文全文数据库 信息科技辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113204256A (en) * | 2021-04-30 | 2021-08-03 | 国家石油天然气管网集团有限公司华南分公司 | Photoelectric conversion circuit of intelligent interface inspection tester and temperature control method |
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