CN109029774A - A kind of multi-point temperature sensor-based system that Bragg grating is constituted - Google Patents
A kind of multi-point temperature sensor-based system that Bragg grating is constituted Download PDFInfo
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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Abstract
The multi-point temperature sensor-based system that a kind of Bragg grating of the invention is constituted 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, will not generate High-frequency Interference, has the characteristics that work is more reliable, sensing accuracy is high, has a wide range of application.
Description
Technical field
The invention belongs to the technical field of fibre optical sensor, in particular to the multi-point temperature that a kind of Bragg grating is constituted passes
Sensing system.
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.Currently, temperature sensor is in safety in production
Play a significant role, especially such as mine Different high risk sites, it is most important to the monitoring of temperature.But traditional temperature sensor is most
It is all the variation realization by electric signal, and the temperature sensor based on change in electric is in practical applications by very big limit
System, the use of one side electric signal can cause additional security risk to certain environment (such as coal mine), on the other hand in severe ring
Interference when using under border by environment is larger and transmission is inconvenient.And bragg grating makes its composition due to its above-mentioned advantage
Temperature sensor compared to other sensors have higher reliability, the use being also more suitable under mal-condition.
It is doctor's thesis " fiber grating sensing system of Nankai University Liu Bo with the immediate prior art of the present invention
Research and realization ", the document provides a kind of bragg fiber light based on non-equilibrium Michelson fiber-optic interferometry demodulation techniques
Grid sensor-based system (referring to Fig. 3 .4 of page 24 of the document), the optical fiber sensing system use non-equilibrium Michelson fiber-optic principle of interference,
Change the length of the arm on a wherein arm in interferometer two-arm using the modulated signal that piezoelectric ceramics (PZT) is provided, thus
Change interferometer output intensity, interferometer output intensity, in cosine function rule, is managed with the variation of PZT modulated signal if used
Think modulated signal of the sawtooth wave as PZT, then the output of optical fiber sensing system is directly cosine wave.Optical fiber sensing system passes through cloth
Glug grating perceives the variation of measurement point stress or temperature, and is reflected as the variation of reflectance spectrum central wavelength, central wavelength
Variation be presented as after above-mentioned non-equilibrium Michelson fiber-optic interferometer output cosine wave phase variation, finally by cosine wave
Phase compares with the phase of sawtooth wave, can reflect the variation of bragg grating reflectance spectrum central wavelength, thus real
Now measure the variation of 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 stress variation.Therefore, existing bragg grating temperature
Sensor also requires further improvement.
Summary of the invention
In order to overcome existing bragg grating temperature sensor there are the shortcomings that, the present invention provides a kind of using just
The multi-point temperature sensor-based system that string signal is constituted as the Bragg grating of PZT driving signal, so as to avoid High-frequency Interference letter
Number generation, and when handling the signal received without using filter, so as to avoid filtering to phase
The influence of generation.
The purpose of the present invention is achieved through the following technical solutions:
A kind of multi-point temperature sensor-based system that Bragg grating is constituted, structure have, pumping source 1 and light wavelength division multiplexing 2
The end 980nm be connected, one end phase at the end 1550nm of light wavelength division multiplexing 2 and the optical fiber being wrapped on the first piezoelectric ceramics 11
Even, the other end for the optical fiber being wrapped on the first piezoelectric ceramics 11 is connected with the input terminal of the first optoisolator 10, the first piezoelectricity
The control terminal of ceramics 11 is connected with the output port of the first PZT driving circuit 12, the input terminal of the first PZT driving circuit 12 and the
The output port of one D/A converting circuit 13 is connected, and the input port of the first D/A converting circuit 13 is connected with single-chip microcontroller 18；The
The output end of one optoisolator 10 is connected with the light input end of optical filter 9, electric control end and 18 phase of single-chip microcontroller of optical filter 9
Even, the light output end of optical filter 9 is connected with the first port of optical circulator 7, the second port and Prague light of optical circulator 7
One end of grid group 8 is connected, and the third port of optical circulator 7 is connected with the input terminal of the first photo-coupler 5, the first photo-coupler 5
90% output end be connected with the input terminal of the second optoisolator 4, the one of the output end of the second optoisolator 4 and Er-doped fiber 3
End is connected, and the other end of Er-doped fiber 3 is connected with the common end of light wavelength division multiplexing 2；10% output end of the first photo-coupler 5
Output is connected with the input terminal of the second photo-coupler 6, the output end and the second faraday rotation mirror 25 of the second photo-coupler 6
Input terminal be connected, the another output of the second photo-coupler 6 and the one end of optical fiber being wrapped on the second piezoelectric ceramics 23
It is connected, the other end for the optical fiber being wrapped on the second piezoelectric ceramics 23 is connected with the input terminal of the first faraday rotation mirror 24, the
The another output of two photo-couplers 6 is connected with the input terminal of the second photoelectric conversion circuit 26；It is characterized in that, structure is also
Have, the input terminal of the output end and function translation circuit 27 of the second photoelectric conversion circuit 26 is connected, functional transformation circuit 27 it is defeated
Outlet is connected with an input terminal of adaptive amplitude normalizing circuit 28, the output end of reference voltage circuit 30 and adaptive amplitude
Another input terminal of normalizing circuit 28 is connected, the output end of adaptive amplitude normalizing circuit 28 and the one of phase-comparison circuit 29
A input terminal is connected；The input terminal in controllable frequency source 21 is connected with single-chip microcontroller 18, and output end is another with phase-comparison circuit 29
A input terminal is connected, and the output end of phase-comparison circuit 29 is connected with single-chip microcontroller 18；The output end in controllable frequency source 21 is also with
The input terminal of two PZT driving circuits 22 is connected, the control terminal of the output end of the 2nd PZT driving circuit 22 and the second piezoelectric ceramics 23
It is connected；The output end of constant-current source circuit 15 is connected with thermistor 16, the input terminal of thermistor 16 and analog to digital conversion circuit 17
It is connected, the output end of analog to digital conversion circuit 17 is connected with single-chip microcontroller 18；Single-chip microcontroller 20 also respectively with input key 14, serial communication
Module 19, display screen 20 are connected；
The structure of the functional transformation circuit 27 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 27 is denoted as port ACOS_in, with
The output end of second photoelectric conversion circuit 26 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 27, port ACOS_out is denoted as, with adaptive amplitude normalizing circuit 28
Input terminal is connected；The model AD639 of the trigonometric function converter U1；
The structure of the adaptive amplitude normalizing circuit 28 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 28
Enter end, be denoted as port ADAPT_in, the port ACOS_out of and function translation circuit 27 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 28
Reference voltage end, be connected with the reference voltage output terminal of reference voltage circuit 30；The pin 10 of chip U2 is used as adaptive width
The output end for spending normalizing circuit 28, is denoted as port ADAPT_out, is connected with an input terminal of phase-comparison circuit 29；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 29 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 29 is denoted as port PHASE_
In1 is connected with the port ADAPT_out of adaptive amplitude normalizing circuit 28；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 29 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 29
End, is denoted as port PHASE_out；
The structure of the reference voltage circuit 30 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 30, is denoted as port Vref, the reference voltage with adaptive amplitude normalizing circuit 28
End is connected.
The structure in the controllable frequency source 21 is a termination+12V power supply of resistance R28, another termination triode Q1's
Base stage；The base stage of a termination triode Q1 of resistance R29, other end ground connection；A termination+12V of resistance R30, another termination three
The collector of pole pipe Q2；The collector of a termination triode Q2 of capacitor C17, the pin 2 of another chip termination U15；Resistance R31
One termination triode Q1 emitter, it is another termination electrolytic capacitor C14 anode；A termination electrolytic capacitor C16 of resistance R21
Anode, the other end ground connection；The cathode of electrolytic capacitor C16 is grounded；The pin 2 of a chip termination U15 of capacitor C18, the other end
Connect the pin 2 of chip U16；The pin 2 of a chip termination U16 of capacitor C19, output of the other end as controllable frequency source 21
End, is denoted as port SineM_out；The base stage of triode Q2 is connected with port SineM_out；A chip termination U15 of capacitor C20
Pin 5, the other end ground connection；The pin 5 of a chip termination U16 of capacitor C21, other end ground connection；The pin 1 and pipe of chip U9
Foot 10 connects+5V power supply, and pin 3, pin 4 and pin 6 are grounded；One end of 9 connecting resistance R32 of pin, the one of 8 connecting resistance R33 of pin
End, one end of 7 connecting resistance R34 of pin；An input port of the other end of resistance R32 as controllable frequency source 21, is denoted as end
Mouth SineM_in1；Another input port of the other end of resistance R33 as controllable frequency source 21, 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 electricity of resistance R34
Source；The pin 1 and pin 10 of chip U16 connects+5V power supply, and pin 3, pin 4 and pin 6 are grounded；The one of 9 connecting resistance R35 of pin
End, one end of 8 connecting resistance R36 of pin, one end of 7 connecting resistance R37 of pin；Another termination port SineM_in1 of resistance R35；
Another termination port SineM_in2 of resistance R36；Another termination+5V power supply of resistance R37.
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 be (Shanghai Ke Naite laser Science and Technology Ltd.
VENUS series 980nm high power single mode pump light source, model VLSS-980-B, maximum single-mode output optical power are 1200mW)
With (the fused tapered 980/1550nm pump light of Shanghai Han Yu Fibre Optical Communication Technology Co., Ltd production of light wavelength division multiplexing 2
Wave division multiplex coupler) the end 980nm be connected, the end 1550nm of light wavelength division multiplexing 2 and be wrapped in the first piezoelectric ceramics 11 (circle
Cylindricality piezoelectric ceramics, outer diameter 50mm, internal diameter 40mm, high 50mm) on optical fiber one end be connected, be wrapped in the first piezoelectric ceramics 11
On optical fiber the other end and the first optoisolator 10 (1310/1480/ of Shanghai Han Yu Fibre Optical Communication Technology Co., Ltd production
1550nm polarization independent optical isolator) input terminal be connected, the control terminal of the first piezoelectric ceramics 11 and the first PZT driving circuit 12
Output port be connected, the input terminal of the first PZT driving circuit 12 is connected with the output port of the first D/A converting circuit 13, the
The input port of one D/A converting circuit 13 is connected with single-chip microcontroller 18 (STC89C51)；The output end and light of first optoisolator 10
The light input end of filter 9 (production of Micron Optics company, model FFP-TF-1060-010G0200-2.0) is connected,
The electric control end of optical filter 9 is connected with single-chip microcontroller 18, the light output end of optical filter 9 and (the Shanghai Han Yu company of optical circulator 7
The PIOC3-15 optical circulator of production) first port be connected, the second port of optical circulator 7 and the (reflection of Bragg grating group 8
Rate is 90 percent, and bandwidth is 0.6nm, and central wavelength is respectively three Bradleys of 1550nm, 1560nm and 1630nm
Lattice grating) one end be connected, (OZ-OPTICS company produces the third port of optical circulator 7, model with the first photo-coupler 5
FUSED-12-1064-7/125-90/10-3U-3mm, splitting ratio 90:10) input terminal be connected, the first photo-coupler 5
4 (the 1310/1480/1550nm of Shanghai Han Yu Fibre Optical Communication Technology Co., Ltd production of 90% output end and the second optoisolator
Polarization independent optical isolator) input terminal be connected, the output end of the second optoisolator 4 and (the Nufern company of the U.S. of Er-doped fiber 3
The C-Band Er-doped fiber of the high-performance 980nm pumping of production, model EDFC-980-HP, 3 meters) one end be connected, er-doped light
The other end of fibre 3 is connected with the common end of light wavelength division multiplexing 2.Above structure constitutes the basic luminaire part of fibre optical sensor
And transducing part.The 10% output end output of first photo-coupler 5 and the second photo-coupler 6 (2 × 2 standard single mode photo-couplers,
Splitting ratio is 50:50) input terminal be connected, the output end and the second faraday rotation mirror 25 of the second photo-coupler 6
The input terminal of the MFI-1310 of production (THORLABS company) is connected, the another output of the second photo-coupler 6 be wrapped in
One end of optical fiber on second piezoelectric ceramics 23 (cylindrical piezoelectric ceramics, outer diameter 50mm, internal diameter 40mm, high 50mm) is connected, and twines
It is wound on the 24 (MFI- of THORLABS company production of the other end and the first faraday rotation mirror of the optical fiber on the second piezoelectric ceramics 23
1310) input terminal is connected, the input terminal phase of the another output of the second photo-coupler 6 and the second photoelectric conversion circuit 26
Even.Above-mentioned second photo-coupler 6, the first faraday rotation mirror 24, the second faraday rotation mirror 25 and the second piezoelectric ceramics 23
Collectively constitute Michelson interference structure.
Structure of the invention in addition, the output end and function translation circuit 27 of the second photoelectric conversion circuit 26 input terminal phase
Even, the output end of functional transformation circuit 27 is connected with an input terminal of adaptive amplitude normalizing circuit 28, reference voltage circuit
30 output end is connected with another input terminal of adaptive amplitude normalizing circuit 28, the output of adaptive amplitude normalizing circuit 28
End is connected with an input terminal of phase-comparison circuit 29；The input terminal in controllable frequency source 21 is connected with single-chip microcontroller 18, output end
It is connected with another input terminal of phase-comparison circuit 29, the output end of phase-comparison circuit 29 is connected with single-chip microcontroller 18；Controllably
The output end of frequency source 21 is also connected with the input terminal of the 2nd PZT driving circuit 22, the output end of the 2nd PZT driving circuit 22 with
The control terminal of second piezoelectric ceramics 23 is connected.Above structure constitutes the demodulation part of sensor.The output of constant-current source circuit 15
End be connected with thermistor 16, thermistor 16 is connected with the input terminal of analog to digital conversion circuit 17, analog to digital conversion circuit 17 it is defeated
Outlet is connected with single-chip microcontroller 18.Above structure is that the present invention provides temperature compensation functions.Single-chip microcontroller 18 is also pressed with input respectively
Key 14, serial communication modular 19 (MAX232), display screen 20 are connected, for parameter to be arranged, letter is communicated and shown with computer
The functions such as breath.
2 functional transformation circuit of embodiment
The structure of the functional transformation circuit 27 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 27 is denoted as port ACOS_in, with
The output end of second photoelectric conversion circuit 26 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 27, port ACOS_out is denoted as, with adaptive amplitude normalizing circuit 28
Input terminal is connected；The model AD639 of the trigonometric function converter U1；The circuit has the function of anti-cosine transform, by
The signal of two photoelectric conversion circuits 26 output carries out anticosine processing.
The adaptive amplitude normalizing circuit of embodiment 3
Since the signal amplitude that functional transformation circuit 27 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 28, for the signal for exporting functional transformation circuit 27
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 28, is denoted as port ADAPT_in, and the port ACOS_out of and function translation circuit 27 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 28, it is connected with the reference voltage output terminal of reference voltage circuit 30；Chip
Output end of the pin 10 of U2 as adaptive amplitude normalizing circuit 28, is denoted as port ADAPT_out, with phase-comparison circuit 29
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 29 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 29,
It is denoted as port PHASE_in1, is connected with the port ADAPT_out of adaptive amplitude normalizing circuit 28；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 29 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
29 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) that normalizing circuit 28 exports carries out phase bit comparison, and
Comparison result is sent into single-chip microcontroller 18, single-chip microcontroller 18 calculates the temperature at Bragg grating group 8 and become according to the phase differential
Change.
5 reference voltage circuit of embodiment
As shown in figure 5, the structure of the reference voltage circuit 30 is, and a termination+5V power supply of resistance R27, the other end
The non-inverting input terminal of amplifier U13, the plus earth of zener diode D3 are connect, cathode meets amplifier U13 non-inverting input terminal, amplifier U13
Inverting input terminal be connected with output end, positive supply termination+5V power supply, negative power end ground connection, output end be+2.5V power supply, respectively
+ 2.5V power supply in module is provided by the output end；A termination+2.5V power supply of slide rheostat W4, other end ground connection are sliding
Moved end connects the non-inverting input terminal of amplifier U14；The anti-phase input of amplifier U14 terminates its output end, and positive supply termination+5V power supply is born
Power end ground connection, output end of the output end as reference voltage circuit 30 is denoted as port Vref, with adaptive amplitude normalizing circuit
28 reference voltage end is connected.
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+12V power supply of resistance R28,
The base stage of another termination triode Q1；The base stage of a termination triode Q1 of resistance R29, other end ground connection；One end of resistance R30
Connect+12V, the collector of another termination triode Q2；The collector of a termination triode Q2 of capacitor C17, another chip termination
The pin 2 of U15；The emitter of a termination triode Q1 of resistance R31, the anode of another termination electrolytic capacitor C14；Resistance R21
One termination electrolytic capacitor C16 anode, the other end ground connection；The cathode of electrolytic capacitor C16 is grounded；A termination core of capacitor C18
The pin 2 of piece U15, the pin 2 of another chip termination U16；The pin 2 of a chip termination U16 of capacitor C19, other end conduct
The output end in controllable frequency source 21 is denoted as port SineM_out；The base stage of triode Q2 is connected with port SineM_out；Capacitor
The pin 5 of a chip termination U15 of C20, other end ground connection；The pin 5 of a chip termination U16 of capacitor C21, another termination
Ground；The pin 1 and pin 10 of chip U9 connects+5V power supply, and pin 3, pin 4 and pin 6 are grounded；The one of 9 connecting resistance R32 of pin
End, one end of 8 connecting resistance R33 of pin, one end of 7 connecting resistance R34 of pin；The other end of resistance R32 is as controllable frequency source 21
An input port, be denoted as port SineM_in1；Another input of the other end of resistance R33 as controllable frequency source 21
Port is denoted as port SineM_in2；Port SineM_in1 and port SineM_in2 are connected with the input terminal of single-chip microcontroller 18；Electricity
Hinder another termination+5V power supply of R34；The pin 1 and pin 10 of chip U16 connects+5V power supply, and pin 3, pin 4 and pin 6 connect
Ground；One end of 9 connecting resistance R35 of pin, one end of 8 connecting resistance R36 of pin, one end of 7 connecting resistance R37 of pin；Resistance R35's is another
One termination port SineM_in1；Another termination port SineM_in2 of resistance R36；Another termination+5V power supply of resistance R37.
The adjustable standard sine wave of module output frequency, required sinusoidal signal is provided for demodulation part of the invention.
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 (sensitive position in such as mine) for needing monitoring temperature to change, and cloth position lattice grating group 8 is by 3 (roots
According to needing that other quantity can also be set to) the different Bragg grating of reflectance spectrum constitutes, it can be achieved that simultaneously to 3 (or multiple) mesh
Mark carries out temperature monitoring.It is bragg grating by the optical fiber laser annular chamber that Er-doped fiber 3, optoisolator 4 etc. form
Group 8 provides wideband light sources, and each bragg grating has a specific reflectance spectrum, different gratings, reflectance spectrum
Peak wavelength is different, when some measured point, temperature changes, the reflectance spectrum peak wave of the bragg grating at this
Length can occur to deviate accordingly, and reflected light enters by the second photo-coupler 6, the second piezoelectric ceramics 23, the first faraday rotation mirror
24 and second faraday rotation mirror 25 constitute Michelson's interferometer in, while controllable frequency source 21 be Michelson's interferometer
A control signal sin (ω t) is provided, which is influenced in interferometer by the light that bragg grating reflects, then is passed through
Second photoelectric conversion circuit 26 is converted into electric signal and by obtaining sin (ω t+ after the anti-cosine transform of functional transformation circuit 27
Δ θ), which is adjusted to a suitable size (by reference voltage circuit through adaptive 28 amplitude of amplitude normalizing circuit
30 controls), compared with controllable frequency source 21 generates sinusoidal signal sin (ω t), phase is changed signal at this time, is passed through
The phase difference detection of the two comes out and is sent into single-chip microcontroller 18 by phase-comparison circuit 29, phase difference real reaction measured point
Temperature change finally realizes the detection to measured point temperature.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, also there is no need to use bandpass filter in demodulator circuit
It is filtered, avoids and the amplitude-frequency characteristic and phase-frequency characteristic of output signal are had an impact.The present invention is believed using standard sine wave
Number be used as PZT modulated signal, when being demodulated to modulated signal, dexterously use functional transformation circuit 27 and adaptive width
Normalizing circuit 28 is spent, modulated signal is recovered into phase is controlled by the Bragg grating group 8 and suitable sinusoidal signal of amplitude,
When so that carrying out phase bit comparison in phase-comparison circuit 29, controlled signal and original signal can be highly precisely compared
Phase difference, thus the environmental parameter that accurately reaction 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.Thermistor 16 is temperature sensor, can cause its resistance when the environmental temperature is changed
Value generates variation, and since constant-current source circuit 15 provides constant current for it, the variation of 16 resistance value of thermistor can cause it
The variation of voltage caused by both ends, then it is converted into digital signal input single-chip microcontroller 18 through analog to digital conversion circuit 17, for compensating
Measurement result bring error is given in the variation of environment temperature locating for optical fiber laser annular chamber.
Claims (3)
1. the multi-point temperature sensor-based system that a kind of Bragg grating is constituted, structure have, pumping source (1) and light wavelength division multiplexing
(2) the end 980nm is connected, the end 1550nm of light wavelength division multiplexing (2) and the optical fiber that is wrapped on the first piezoelectric ceramics (11)
One end is connected, and is wrapped in the input terminal phase of the other end and the first optoisolator (10) of the optical fiber on the first piezoelectric ceramics (11)
Even, the control terminal of the first piezoelectric ceramics (11) is connected with the output port of the first PZT driving circuit (12), the first PZT driving electricity
The input terminal on road (12) is connected with the output port of the first D/A converting circuit (13), the input of the first D/A converting circuit (13)
Port is connected with single-chip microcontroller (18)；The output end of first optoisolator (10) is connected with the light input end of optical filter (9), light filter
The electric control end of wave device (9) is connected with single-chip microcontroller (18), the light output end of optical filter (9) and the first end of optical circulator (7)
Mouth is connected, and the second port of optical circulator (7) is connected with one end of Bragg grating group (8), the third port of optical circulator (7)
It is connected with the input terminal of the first photo-coupler (5), 90% output end of the first photo-coupler (5) and the second optoisolator (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)
It is connected with the common end of light wavelength division multiplexing (2)；The output of 10% output end and the second photo-coupler of first photo-coupler (5)
(6) input terminal is connected, the input terminal phase of the output end and the second faraday rotation mirror (25) of the second photo-coupler (6)
Even, the another output of the second photo-coupler (6) is connected with the one end for the optical fiber being wrapped on the second piezoelectric ceramics (23), twines
The other end for the optical fiber being wound on the second piezoelectric ceramics (23) is connected with the input terminal of the first faraday rotation mirror (24), the second light
The another output of coupler (6) is connected with the input terminal of the second photoelectric conversion circuit (26)；
It is characterized in that, structure in addition, the output end and function translation circuit (27) of the second photoelectric conversion circuit (26) input
End is connected, and the output end of functional transformation circuit (27) is connected with an input terminal of adaptive amplitude normalizing circuit (28), benchmark
The output end of potential circuit (30) is connected with another input terminal of adaptive amplitude normalizing circuit (28), adaptive amplitude normalizing
The output end of circuit (28) is connected with an input terminal of phase-comparison circuit (29)；The input terminal and list in controllable frequency source (21)
Piece machine (18) be connected, output end is connected with another input terminal of phase-comparison circuit (29), phase-comparison circuit (29) it is defeated
Outlet is connected with single-chip microcontroller (18)；Input terminal phase of the output end in controllable frequency source (21) also with the 2nd PZT driving circuit (22)
Even, the output end of the 2nd PZT driving circuit (22) is connected with the control terminal of the second piezoelectric ceramics (23)；Constant-current source circuit (15)
Output end is connected with thermistor (16), and thermistor (16) is connected with the input terminal of analog to digital conversion circuit (17), analog-to-digital conversion
The output end of circuit (17) is connected with single-chip microcontroller (18)；Single-chip microcontroller (20) also respectively with input key (14), serial communication modular
(19), display screen (20) is connected；
The structure of the functional transformation circuit (27) 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 (27) is denoted as port ACOS_in, with
The output end of second photoelectric conversion circuit (26) 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 (27), is denoted as port ACOS_out, with adaptive amplitude normalizing circuit
(28) input terminal is connected；The model AD639 of the trigonometric function converter U1；
The structure of the adaptive amplitude normalizing circuit (28) 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 (28)
Enter end, be denoted as port ADAPT_in, the port ACOS_out of and function translation circuit (27) 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
(28) reference voltage end is connected with the reference voltage output terminal of reference voltage circuit (30)；The pin 10 of chip U2 is as certainly
The output end of amplitude of adaptation normalizing circuit (28), is denoted as port ADAPT_out, an input terminal with phase-comparison circuit (29)
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 (29) 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 (29) is denoted as port PHASE_in1,
It is connected with the port ADAPT_out of adaptive amplitude normalizing circuit (28)；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 (29) 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 (29)
End, is denoted as port PHASE_out；
The structure of the reference voltage circuit (30) 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 (30) is held, port Vref is denoted as, the reference electricity with adaptive amplitude normalizing circuit (28)
Pressure side is connected；
The structure in the controllable frequency source (21) is a termination+12V power supply of resistance R28, the base of another termination triode Q1
Pole；The base stage of a termination triode Q1 of resistance R29, other end ground connection；A termination+12V of resistance R30, three poles of another termination
The collector of pipe Q2；The collector of a termination triode Q2 of capacitor C17, the pin 2 of another chip termination U15；Resistance R31's
The emitter of one termination triode Q1, the anode of another termination electrolytic capacitor C14；A termination electrolytic capacitor C16's of resistance R21
Anode, other end ground connection；The cathode of electrolytic capacitor C16 is grounded；The pin 2 of a chip termination U15 of capacitor C18, another termination
The pin 2 of chip U16；The pin 2 of a chip termination U16 of capacitor C19, output of the other end as controllable frequency source (21)
End, is denoted as port SineM_out；The base stage of triode Q2 is connected with port SineM_out；A chip termination U15 of capacitor C20
Pin 5, the other end ground connection；The pin 5 of a chip termination U16 of capacitor C21, other end ground connection；The pin 1 and pipe of chip U9
Foot 10 connects+5V power supply, and pin 3, pin 4 and pin 6 are grounded；One end of 9 connecting resistance R32 of pin, the one of 8 connecting resistance R33 of pin
End, one end of 7 connecting resistance R34 of pin；An input port of the other end of resistance R32 as controllable frequency source (21), is denoted as
Port SineM_in1；Another input port of the other end of resistance R33 as controllable frequency source (21), is denoted as port
SineM_in2；Port SineM_in1 and port SineM_in2 is connected with the input terminal of single-chip microcontroller (18)；Resistance R34 it is another
Termination+5V power supply；The pin 1 and pin 10 of chip U16 connects+5V power supply, and pin 3, pin 4 and pin 6 are grounded；Pin 9 connects electricity
Hinder one end of R35, one end of 8 connecting resistance R36 of pin, one end of 7 connecting resistance R37 of pin；Another termination port of resistance R35
SineM_in1；Another termination port SineM_in2 of resistance R36；Another termination+5V power supply of resistance R37.
2. the multi-point temperature sensor-based system that a kind of Bragg grating according to claim 1 is constituted, which is characterized in that described
Pumping source (1) be 980nm laser light source.
3. the multi-point temperature sensor-based system that a kind of Bragg grating according to claim 1 or 2 is constituted, which is characterized in that
The Bragg grating group (8) is preferably made of 3 Bragg gratings, and the reflectivity of each grating is 90%, and bandwidth is equal
For 0.6nm, central wavelength is respectively 1550nm, 1560nm and 1630nm.
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Citations (4)
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