CN109186824A - A kind of high-precision strain gauge based on bragg grating - Google Patents
A kind of high-precision strain gauge based on bragg grating Download PDFInfo
- Publication number
- CN109186824A CN109186824A CN201810889077.7A CN201810889077A CN109186824A CN 109186824 A CN109186824 A CN 109186824A CN 201810889077 A CN201810889077 A CN 201810889077A CN 109186824 A CN109186824 A CN 109186824A
- Authority
- CN
- China
- Prior art keywords
- pin
- resistance
- input terminal
- capacitor
- port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000835 fiber Substances 0.000 claims abstract description 34
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 89
- 230000003287 optical effect Effects 0.000 claims description 46
- 230000003044 adaptive effect Effects 0.000 claims description 29
- 230000009466 transformation Effects 0.000 claims description 18
- 239000013307 optical fiber Substances 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000004038 photonic crystal Substances 0.000 claims description 8
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 7
- 238000013519 translation Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 230000005622 photoelectricity Effects 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000985 reflectance spectrum Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000018199 S phase Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 229960004756 ethanol Drugs 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement 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
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002105 nanoparticle Substances 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
- 230000002463 transducing effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
Abstract
A kind of high-precision strain gauge based on bragg grating of the invention belongs to fiber optic sensor technology field.Its primary structure has pumping source (1), the first photo-coupler (2), light wavelength division multiplexing (3) etc..The present invention uses sinusoidal signal as modulated signal, 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 a kind of high-precision based on bragg grating
Strain gauge.
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, strain gauge is led in engineering technology
Domain, which has, to be widely applied.It especially interacts in nanoparticle, the emerging fields such as cyto-mechanics sense utensil for microstress
There is urgent need, the safety monitoring of bridge, tunnel and fabric structure is even more to be unable to do without microstress sensor.And Prague light
Fine grating due to its above-mentioned advantage make its constitute strain gauge compared to other sensors have higher reliability,
The use being 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 based on your interferometry demodulation techniques of non-equilibrium Mach Zehnder
Grating sensing system (referring to Fig. 3 .6 of page 26 of the document), the optical fiber sensing system use Mach Zehnder that principle of interference,
Change the length of the arm using the modulated signal that piezoelectric ceramics (PZT) is provided on a wherein arm in interferometer two-arm, to change
Exsiccation interferometer output intensity, interferometer output intensity is regular in cosine function with the variation of PZT modulated signal, if using ideal
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 Bradley
Lattice grating perceives the variation of measurement point stress, and is reflected as the variation of reflectance spectrum central wavelength, the variation warp of central wavelength
The variation for exporting cosine wave phase is presented as after crossing your interferometer of above-mentioned Mach Zehnder, finally by the phase of cosine wave and sawtooth wave
Phase compare, can reflect the variation of bragg grating reflectance spectrum central wavelength, thus realize measurement the external world answer
The variation of power.
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 stress
Sensor also requires further improvement.
Summary of the invention
In order to overcome existing bragg grating strain gauge there are the shortcomings that, the present invention provides a kind of using just
High-precision strain gauge based on bragg grating of the string signal as PZT driving signal, it is dry so as to avoid high frequency
The generation of signal is disturbed, and when handling the signal received without using filter, so as to avoid filtering pair
The influence that phase generates.
The purpose of the present invention is achieved through the following technical solutions:
A kind of high-precision strain gauge based on bragg grating, structure have, pumping source 1 and the first optical coupling
The input terminal of device 2 is connected, and 90% output end of the first photo-coupler 2 is connected with the end 980nm of light wavelength division multiplexing 3, light wave point
The end 1550nm of multiplexer 3 is connected with one end of delay line adjustable optic fibre 12,12 other end of delay line adjustable optic fibre and the first light
The input terminal of isolator 11 is connected, and the control terminal of delay line adjustable optic fibre 12 is connected with the output port of electrical level transferring chip 13,
The input terminal of electrical level transferring chip 13 is connected with single-chip microcontroller 19;The light of the output end and optical filter 10 of first optoisolator 11 is defeated
Enter end to be connected, the electric control end of optical filter 10 is connected with single-chip microcontroller 20, light output end and the optical circulator 8 of optical filter 10
First port is connected, and the second port of optical circulator 8 is connected with one end of Bragg grating group 9, the third port of optical circulator 8
It is connected with the input terminal of third photo-coupler 6, the input terminal of 90% output end of third photo-coupler 6 and the second optoisolator 5
It is connected, the output end of the second optoisolator 5 is connected with one end of Er-doped fiber 4, the other end and optical wavelength division multiplexing of Er-doped fiber 4
The common end of device 3 is connected;The 10% output end output of third photo-coupler 6 is connected with the input terminal of the 4th photo-coupler 7, and the 4th
One output end of photo-coupler 7 is connected with an input terminal of the 5th photo-coupler 25, and another of the 4th photo-coupler 7 is defeated
Outlet is connected with the one end for the optical fiber being wrapped on piezoelectric ceramics 24, is wrapped in the other end and of the optical fiber on piezoelectric ceramics 24
Another input terminal of five photo-couplers 25 is connected, the input terminal of the output end of the 5th photo-coupler 25 and the first optical detector 26
It is connected, the output end of the 5th photo-coupler 25 is also connected with the input terminal of the second optical detector 27;
It is characterized in that, structure is in addition, the output end of the first optical detector 26 and the homophase input of differential amplifier circuit 28
End is connected, and the output end of the second optical detector 27 is connected with the inverting input terminal of differential amplifier circuit 28, differential amplifier circuit 28
The input terminal of output end and function translation circuit 29 be connected, the output end of functional transformation circuit 29 and adaptive amplitude normalizing electricity
The input terminal on road 30 is connected, an input terminal phase of the output end and phase-comparison circuit 31 of adaptive amplitude normalizing circuit 30
Even;The input terminal in controllable frequency source 22 is connected with single-chip microcontroller 19, another input terminal phase of output end and phase-comparison circuit 31
Even, the output end of phase-comparison circuit 31 is connected with single-chip microcontroller 19;The output end in controllable frequency source 22 also with PZT driving circuit 23
Input terminal be connected, the output end of PZT driving circuit 23 is connected with the control terminal of piezoelectric ceramics 24;First photo-coupler 2
10% output end is connected with an input terminal of the second photo-coupler 16, another input terminal of the second photo-coupler 16 with it is anhydrous
One end that ethyl alcohol fills photonic crystal fiber 15 is connected, and dehydrated alcohol fills the other end and the second optocoupler of photonic crystal fiber 15
One output end of clutch 16 is connected, the another output and the input terminal phase of photoelectric conversion circuit 17 of the second photo-coupler 16
Even, the output end of photoelectricity shifting circuit 17 is connected with the input terminal of analog to digital conversion circuit 18, the output end of analog to digital conversion circuit 18 and
Single-chip microcontroller 19 is connected;Single-chip microcontroller 19 is also connected with input key 14, serial communication modular 20, display screen 21 respectively;
The structure of the functional transformation circuit 29 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 29 is denoted as port ACOS_in, with
The output end of differential amplifier circuit 28 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 29, is denoted as port ACOS_out, the input with adaptive amplitude normalizing circuit 30
End is connected;The model AD639 of the trigonometric function converter U1;
The structure of the adaptive amplitude normalizing circuit 30 is one end of capacitor C9 and one end of resistance R3 and chip U2
Pin 3 be connected, the other end of resistance R3 ground connection, input of the other end of capacitor C9 as adaptive amplitude normalizing circuit 30
End, is denoted as port ADAPT_in, and the port ACOS_out of and function translation circuit 29 is connected;Pin 1, pin 7, the pipe of chip U2
Foot 8, pin 14 are grounded, and pin 2 is connected with+5V power supply with pin 4, and pin 11 is connected and one with capacitor C5 with pin 12
End and+5V power supply are connected, the other end ground connection of capacitor C5;The pin 13 of chip U2 is connected with one end of capacitor C4, capacitor C4's
Other end ground connection;The pin 9 of chip U2 is connected with one end of capacitor C6, the other end ground connection of capacitor C6;The pin 5 of chip U2 with
One end of resistance R12 and resistance R11 are connected, the other end ground connection of resistance R12, the output of the other end and amplifier U4 of resistance R11
End and one end of capacitor C8 are connected, the positive supply termination+5V power supply of amplifier U8, negative power end ground connection;The other end of capacitor C8 with
One end of resistance R10 is connected, and the other end of resistance R10 is connected with the non-inverting input terminal of amplifier U4;The inverting input terminal of amplifier U4
It is connected with the sliding end of sliding variohm W3, one end of slide rheostat W3 is connected with+5V power supply, and slide rheostat W3's is another
One end ground connection;One end of capacitor C7 is connected with the non-inverting input terminal of one end of resistance R9 and amplifier U4, another termination of capacitor C7
The other end on ground, resistance R9 is connected with the output end of one end of resistance R7 and amplifier U3, and the other end of resistance R7 is with amplifier U3's
Inverting input terminal is connected;One end of resistance R8 is connected with the non-inverting input terminal of amplifier U3, other end ground connection;The positive supply of amplifier U3
Termination+5V power supply, negative power end ground connection;Output end of the pin 10 of chip U2 as adaptive amplitude normalizing circuit 30, is denoted as
Port ADAPT_out is connected with an input terminal of phase-comparison circuit 31;The pin 10 of chip U2 and the anode of diode D1
It is connected, the cathode of diode D1 is connected with one end of resistance R4, the other end of resistance R4 and one end of resistance R5 and amplifier U3's
Inverting input terminal is connected, and the other end of resistance R5 is connected with the anode of diode D2, the cathode and slide rheostat of diode D2
The sliding end of W2 is connected;One end of slide rheostat W2 is connected and is grounded with the cathode of diode D3, and slide rheostat W2's is another
One end is connected with the anode of one end of resistance R6 and diode D3, another termination -5V power supply of resistance R6;The chip U2 is
Variable gain amplifier chip, model are AD8367;
The structure of the phase-comparison circuit 31 is one end of capacitor C10 and the non-inverting input terminal and resistance of amplifier U5
One end of R13 is connected, and an input terminal of the other end of capacitor C10 as phase-comparison circuit 31 is denoted as port PHASE_
In1 is connected with the port ADAPT_out of adaptive amplitude normalizing circuit 30;The other end of resistance R13 is grounded;Amplifier U5 is just
Power supply termination+5V power supply, negative power end ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U6A;D type flip flop
The port D of U6A is grounded;The one end capacitor C11 ground connection, the end PR of another termination d type flip flop U6A;Resistance R14 mono- terminates d type flip flop
The end PR of U6A, the end Q of another termination d type flip flop U6A;CLR termination+5V the power supply of d type flip flop U6A, the Q of d type flip flop U6A are non-
Terminate the end PR of d type flip flop U8A;One end of capacitor C12 is connected with one end of the non-inverting input terminal of amplifier U7 and resistance R15, electricity
Hold another input terminal of the other end of C12 as phase-comparison circuit 31, port PHASE_in2 is denoted as, with controllable frequency source
22 port SineM_out is connected;The other end of resistance R15 is grounded;Positive supply termination+5V the power supply of amplifier U7, negative power end
Ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U6B;The port D of d type flip flop U6B is grounded;Capacitor C13 mono-
End ground connection, the end PR of another termination d type flip flop U6B;Resistance R16 mono- terminates the end PR of d type flip flop U6B, another termination d type flip flop
The end Q of U6B;CLR termination+5V the power supply of d type flip flop U6B, the end CLR of the Q non-terminated d type flip flop U8A of d type flip flop U6B;D touching
The end D and the end CLK for sending out device U8A are grounded, and output end of the end Q as phase-comparison circuit 31 is denoted as port PHASE_out, with
The input terminal of single-chip microcontroller 19 is connected;
The structure in the controllable frequency source 22 is the inverting input terminal of a termination amplifier U9 of thermistor Rt1, another
Terminate the output end of amplifier U9;Resistance R17 mono- terminates the inverting input terminal of amplifier U9, and the other end is defeated as controllable frequency source 22
Exit port is denoted as port SineM_out;The non-inverting input terminal of a termination amplifier U9 of resistance R18, other end ground connection;Amplifier U9
Positive supply termination+5V power supply, negative supply termination -5V power supply, export termination capacitor C14 one end;A termination core of capacitor C14
The pin 2 of piece U10;The pin 2 of a chip termination U10 of capacitor C15, the pin 2 of another chip termination U11;The one of capacitor C16
The pin 2 of chip termination U11, another termination port SineM_out;The pin 5 of a chip termination U10 of capacitor C17, the other end
Ground connection;The pin 5 of a chip termination U11 of capacitor C18, other end ground connection;The pin 1 and pin 10 of chip U10 connects+5V electricity
Source, pin 3, pin 4 and pin 6 are grounded;One end of 9 connecting resistance R19 of pin, one end of 8 connecting resistance R120 of pin, pin 7 connect
One end of resistance R21;An input port of the other end of resistance R19 as controllable frequency source 22, is denoted as port SineM_
in1;Another input port of the other end of resistance R20 as controllable frequency source 22, is denoted as port SineM_in2;Port
SineM_in1 and port SineM_in2 are connected with single-chip microcontroller 19;Another termination+5V power supply of resistance R21;The pin of chip U11
1 and pin 10 connect+5V power supply, pin 3, pin 4 and pin 6 are grounded;One end of 9 connecting resistance R22 of pin, 8 connecting resistance R23 of pin
One end, one end of 7 connecting resistance R24 of pin;Another termination port SineM_in1 of resistance R22;Another termination of resistance R23
Port SineM_in2;Another termination+5V power supply of resistance R24.
The preferred 980nm laser light source of pumping source 1.
The Bragg grating group 9 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 in the controllable frequency source that the present invention uses.
Specific embodiment
The working principle of the invention is further illustrated with reference to the accompanying drawing, it should be appreciated that the component marked in attached drawing
Parameter is the preferred parameter that following embodiment uses, rather than limiting the scope of the invention.
The overall structure of the invention of embodiment 1
As shown in Figure 1, overall structure of the invention has, pumping source 1 (the LC962U type pumping source of OCLARO company, center
Wavelength 980nm, maximum single-mode output optical power are 750mW) and the 2 (model of OZ-OPTICS company production of the first photo-coupler
FUSED-12-1060-7/125-50/50-3U-3mm, splitting ratio be 10:90 1 × 2 fiber coupler) input terminal be connected,
(COMCORE company 980/1060nm single mode optical fiber wavelength-division is multiple for 90% output end and light wavelength division multiplexing 3 of first photo-coupler 2
With device) the end 980nm be connected, the end 1550nm of light wavelength division multiplexing 3 and (the Sichuan space star aberration science and technology of delay line adjustable optic fibre 12
The electronic fibre delay line of VDL-40-15-S9-1-FA type of Co., Ltd) one end be connected, 12 other end of delay line adjustable optic fibre
It is connected with the input terminal of the first optoisolator 11 (1550nm polarization independent optical isolator), the control terminal of delay line adjustable optic fibre 12
It is connected with the output port of electrical level transferring chip 13 (MAX232), the input terminal and single-chip microcontroller 19 of electrical level transferring chip 13
(STC89C51 single-chip microcontroller) is connected;(Micron Optics company is raw for the output end and optical filter 10 of first optoisolator 11
Produce, model FFP-TF-1060-010G0200-2.0) light input end be connected, the electric control end of optical filter 10 and single-chip microcontroller
20 are connected, and the light output end of optical filter 10 is connected with the first port of optical circulator 8 (PIOC3-15 of Shanghai Han Yu company),
(reflectivity is 90% to the second port and Bragg grating group 9 of optical circulator 8, and bandwidth is 0.6nm, central wavelength difference
For three Bragg gratings of 1550nm, 1560nm and 1630nm) one end be connected, the third port and third of optical circulator 8
(the model FUSED-12-1060-7/125-50/50-3U-3mm of OZ-OPTICS company production, splitting ratio are photo-coupler 6
1 × 2 fiber coupler of 10:90) input terminal be connected, 90% output end of third photo-coupler 6 and the second optoisolator 5
The input terminal of (1550nm polarization independent optical isolator) is connected, the output end of the second optoisolator 5 and the 4 (U.S. of Er-doped fiber
Nufern company production SM-ESF-7/125 Er-doped fiber) one end be connected, the other end and optical wavelength division multiplexing of Er-doped fiber 4
The common end of device 3 is connected.Above structure constitutes basic luminaire part and the transducing part of fibre optical sensor.Third photo-coupler
6 10% output end output and 7 (the model FUSED-12-1060-7/ of OZ-OPTICS company production of the 4th photo-coupler
125-50/50-3U-3mm, splitting ratio be 50:50 1 × 2 fiber coupler) input terminal be connected, the one of the 4th photo-coupler 7
A output end is connected with an input terminal of the 5th photo-coupler 25, the another output of the 4th photo-coupler 7 be wrapped in
One end of optical fiber on piezoelectric ceramics 24 (cylindrical piezoelectric ceramics, outer diameter 50mm, internal diameter 40mm, high 50mm) is connected, and is wrapped in
The other end of optical fiber on piezoelectric ceramics 24 and the 5th photo-coupler 25 (2 × 2 standard single mode photo-couplers, splitting ratio 50:
50) another input terminal is connected, and (the quick light science and technology in Beijing is limited with the first optical detector 26 for the output end of the 5th photo-coupler 25
The LSIPD-LD50 type optical detector of company) input terminal be connected, the output end of the 5th photo-coupler 25 also with the second optical detection
The input terminal of device 27 (the LSIPD-LD50 type optical detector of the quick Micron Technology Co., Ltd in Beijing) is connected.Above-mentioned 4th photo-coupler
7, the 5th photo-coupler 25 and piezoelectric ceramics 24 collectively constitute Mach Zehnder that interferometer interference structure.
Structure of the invention in addition, the output end and differential amplifier circuit 28 of the first optical detector 26 non-inverting input terminal phase
Even, the output end of the second optical detector 27 is connected with the inverting input terminal of differential amplifier circuit 28, differential amplifier circuit 28 it is defeated
The input terminal of outlet and function translation circuit 29 is connected, the output end of functional transformation circuit 29 and adaptive amplitude normalizing circuit 30
An input terminal be connected, another input terminal phase of the output end of reference voltage circuit 32 and adaptive amplitude normalizing circuit 30
Even, the output end of adaptive amplitude normalizing circuit 30 is connected with an input terminal of phase-comparison circuit 31;Controllable frequency source 22
Input terminal be connected with single-chip microcontroller 19, output end is connected with another input terminal of phase-comparison circuit 31, phase-comparison circuit
Be connected with single-chip microcontroller 19 output end in controllable frequency source 22 of 31 output end is also connected with the input terminal of PZT driving circuit 23, PZT
The output end of driving circuit 23 is connected with the control terminal of piezoelectric ceramics 24.Above structure constitutes the demodulation part of sensor.The
16 (the model FUSED-12- of OZ-OPTICS company production of 10% output end of one photo-coupler 2 and the second photo-coupler
1060-7/125-50/50-3U-3mm, splitting ratio be 10:90 1 × 2 fiber coupler) an input terminal be connected, the second light
Another input terminal and dehydrated alcohol filling photonic crystal fiber 15 of coupler 16 are (by the production of NKT Photonics company
The airport filling dehydrated alcohol of PM-1550-01 photonic crystal fiber is constituted) one end be connected, it is brilliant that dehydrated alcohol fills photon
The other end of body optical fiber 15 is connected with an output end of the second photo-coupler 16, the another output of the second photo-coupler 16
It is connected with the input terminal of photoelectric conversion circuit 17, the input terminal phase of the output end and analog to digital conversion circuit 18 of photoelectricity shifting circuit 17
Even, the output end of analog to digital conversion circuit 18 is connected with single-chip microcontroller 19.Above structure is that the present invention provides temperature compensation functions.It is single
Piece machine 19 is also connected with input key 14, serial communication modular 20 (MAX232), display screen 21 respectively, for be arranged parameter and
The functions such as computer communication and display information.
2 functional transformation circuit of embodiment
The structure of the functional transformation circuit 29 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 29 is denoted as port ACOS_in, with
The output end of differential amplifier circuit 28 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 29, is denoted as port ACOS_out, the input with adaptive amplitude normalizing circuit 30
End is connected;The model AD639 of the trigonometric function converter U1;The circuit has the function of anti-cosine transform, puts to difference
The signal that big circuit 28 exports carries out anticosine processing.
The adaptive amplitude normalizing circuit of embodiment 3
Since the signal amplitude that functional transformation circuit 29 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 30, for the signal for exporting functional transformation circuit 29
Amplitude normalization at best size, to further increase the precision of demodulation.The knot of the adaptive amplitude normalizing circuit 30
Structure is that one end of capacitor C9 is connected with the pin 3 of one end of resistance R3 and chip U2, the other end ground connection of resistance R3, capacitor C9
Input terminal of the other end as adaptive amplitude normalizing circuit 30, be denoted as port ADAPT_in, and function translation circuit 29
Port ACOS_out is connected;Pin 1, pin 7, pin 8, the pin 14 of chip U2 is grounded, and pin 2 and pin 4 are electric with+5V
Source is connected, and pin 11 is connected with pin 12 and is connected with one end of capacitor C5 and+5V power supply, the other end ground connection of capacitor C5;Core
The pin 13 of piece U2 is connected with one end of capacitor C4, the other end ground connection of capacitor C4;The pin 9 of chip U2 and one end of capacitor C6
It is connected, the other end ground connection of capacitor C6;The pin 5 of chip U2 is connected with one end of resistance R12 and resistance R11, and resistance R12's is another
One end ground connection, the other end of resistance R11 are connected with one end of the output end of amplifier U4 and capacitor C8, the positive supply termination of amplifier U8
+ 5V power supply, negative power end ground connection;The other end of capacitor C8 is connected with one end of resistance R10, the other end and amplifier of resistance R10
The non-inverting input terminal of U4 is connected;The inverting input terminal of amplifier U4 is connected with the sliding end of sliding variohm W3, slide rheostat
One end of W3 is connected with+5V power supply, the other end ground connection of slide rheostat W3;One end of capacitor C7 and one end of resistance R9 and fortune
The non-inverting input terminal for putting U4 is connected, the other end ground connection of capacitor C7, the other end of resistance R9 and one end of resistance R7 and amplifier U3
Output end be connected, the other end of resistance R7 is connected with the inverting input terminal of amplifier U3;One end of resistance R8 is same with amplifier U3's
Phase input terminal is connected, other end ground connection;Positive supply termination+5V the power supply of amplifier U3, negative power end ground connection;The pin 10 of chip U2
As the output end of adaptive amplitude normalizing circuit 30, it is denoted as port ADAPT_out, an input with phase-comparison circuit 31
End is connected;The pin 10 of chip U2 is connected with the anode of diode D1, and the cathode of diode D1 is connected with one end of resistance R4, electricity
The other end of resistance R4 is connected with the inverting input terminal of one end of resistance R5 and amplifier U3, and the other end of resistance R5 is with diode D2's
Anode is connected, and the cathode of diode D2 is connected with the sliding end of slide rheostat W2;One end of slide rheostat W2 and diode
The cathode of D3 is connected and is grounded, and the other end of slide rheostat W2 is connected with the anode of one end of resistance R6 and diode D3, electricity
Hinder another termination -5V power supply of R6;The chip U2 is variable gain amplifier chip, and model is AD8367.
4 phase-comparison circuit of embodiment
As shown in figure 4, the structure for the phase-comparison circuit 31 that the present invention uses is one end of capacitor C10 and fortune
One end of the non-inverting input terminal and resistance R13 of putting U5 is connected, and the other end of capacitor C10 is defeated as one of phase-comparison circuit 31
Enter end, is denoted as port PHASE_in1, is connected with the port ADAPT_out of adaptive amplitude normalizing circuit 30;Resistance R13's is another
One end ground connection;Positive supply termination+5V the power supply of amplifier U5, negative power end ground connection, reverse inter-input-ing ending grounding, output termination D triggering
The end CLK of device U6A;The port D of d type flip flop U6A is grounded;The one end capacitor C11 ground connection, the end PR of another termination d type flip flop U6A;
Resistance R14 mono- terminates the end PR of d type flip flop U6A, the end Q of another termination d type flip flop U6A;CLR termination+the 5V of d type flip flop U6A
Power supply, the end PR of the Q non-terminated d type flip flop U8A of d type flip flop U6A;One end of capacitor C12 and the non-inverting input terminal of amplifier U7 and
One end of resistance R15 is connected, another input terminal of the other end of capacitor C12 as phase-comparison circuit 31 is denoted as port
PHASE_in2 is connected with the port SineM_out in controllable frequency source 22;The other end of resistance R15 is grounded;The positive electricity of amplifier U7
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 U6B;D type flip flop
The port D of U6B is grounded;The one end capacitor C13 ground connection, the end PR of another termination d type flip flop U6B;Resistance R16 mono- terminates d type flip flop
The end PR of U6B, the end Q of another termination d type flip flop U6B;CLR termination+5V the power supply of d type flip flop U6B, the Q of d type flip flop U6B are non-
Terminate the end CLR of d type flip flop U8A;The end D and the end CLK of d type flip flop U8A is grounded, and the end Q is defeated as phase-comparison circuit 31
Outlet is denoted as port PHASE_out, is connected with the input terminal of single-chip microcontroller 19.It is connected with the input terminal of single-chip microcontroller 19.The circuit will
(its phase is by Prague for the sine wave of standard sine wave and the output of adaptive amplitude normalizing circuit 30 that controllable frequency source 22 exports
The environment that grating group 9 is detected influences) phase bit comparison is carried out, and comparison result is sent into single-chip microcontroller 19, single-chip microcontroller 19 is according to this
Phase differential calculates the stress variation at Bragg grating group 9
5 controllable frequency source of embodiment
As shown in figure 5, the inverting input terminal of a termination amplifier U9 of thermistor Rt1 used in the present invention, the other end
Connect the output end of amplifier U9;Resistance R17 mono- terminates the inverting input terminal of amplifier U9, output of the other end as controllable frequency source 22
Port is denoted as port SineM_out;The non-inverting input terminal of a termination amplifier U9 of resistance R18, other end ground connection;Amplifier U9's
Positive supply termination+5V power supply, negative supply termination -5V power supply export one end of termination capacitor C14;A chip termination of capacitor C14
The pin 2 of U10;The pin 2 of a chip termination U10 of capacitor C15, the pin 2 of another chip termination U11;One end of capacitor C16
Meet the pin 2 of chip U11, another termination port SineM_out;The pin 5 of a chip termination U10 of capacitor C17, another termination
Ground;The pin 5 of a chip termination U11 of capacitor C18, other end ground connection;The pin 1 and pin 10 of chip U10 connects+5V power supply,
Pin 3, pin 4 and pin 6 are grounded;One end of 9 connecting resistance R19 of pin, one end of 8 connecting resistance R120 of pin, 7 connecting resistance of pin
One end of R21;An input port of the other end of resistance R19 as controllable frequency source 22, is denoted as port SineM_in1;Electricity
Another input port of the other end of R20 as controllable frequency source 22 is hindered, port SineM_in2 is denoted as;Port SineM_in1
It is connected with port SineM_in2 with the input terminal of single-chip microcontroller 19;Another termination+5V power supply of resistance R21;The pin 1 of chip U11
+ 5V power supply is connect with pin 10, pin 3, pin 4 and pin 6 are grounded;One end of 9 connecting resistance R22 of pin, 8 connecting resistance R23 of pin
One end, one end of 7 connecting resistance R24 of pin;Another termination port SineM_in1 of resistance R22;Another termination of resistance R23
Port SineM_in2;Another termination+5V power supply of resistance R24.The adjustable standard sine wave of module output frequency is this hair
Bright demodulation part provides required sinusoidal signal.
6 the working principle of the invention of embodiment
In conjunction with the various embodiments described above and each attached drawing, illustrate the working principle of the invention.When work, by bragg grating
Group 9 is placed on each position (such as bridge, building load-bearing pillar) for needing monitor stress to change, by Er-doped fiber 4, optical isolation
The optical fiber laser annular chamber of the compositions such as device 5 is that bragg grating group 9 provides wideband light source, each bragg grating
A specific reflectance spectrum is had, the peak wavelength of different gratings, reflectance spectrum is different, when some measurand stress occurs
When variation, the reflectance spectrum peak wavelength of the bragg grating at this can occur to deviate accordingly, and reflected light enters by the
In the Mach Zehnder that interferometer that four photo-couplers 7, piezoelectric ceramics 24, the 5th photo-coupler 25 are constituted, while controllable frequency source
22 provide a control signal sin (ω t) for Mach Zehnder that interferometer, and the signal is in interferometer by bragg grating
The influence of the light of reflection, then it is converted into electric signal through the first optical detector 26, the second optical detector 27, by differential amplifier circuit 28
Differential amplification is carried out, and by obtaining sin (ω t+ Δ θ) after the anti-cosine transform of functional transformation circuit 29, the signal is through adaptive
30 amplitude of amplitude normalizing circuit is answered to be adjusted to a suitable size, signal and controllable frequency source 22 at this time generates sine
Signal sin (ω t) is compared, and phase is changed, and the phase difference detection of the two is come out and sent by phase-comparison circuit 31
Enter single-chip microcontroller 19, the phase difference real reaction stress variation of measured point finally realizes the detection to measured point stress.This
Invention, without using sawtooth wave, is believed during modulation and demodulation so as to avoid sawtooth wave failing edge bring high dither
Number, also there is no need to use bandpass filter to be filtered in demodulator circuit, avoid to the amplitude-frequency characteristic of output signal and
Phase-frequency characteristic has an impact.The present invention is solved using standard sine wave signal as PZT modulated signal to modulated signal
Timing, dexterously use functional transformation circuit 29 and adaptive amplitude normalizing circuit 30, by modulated signal recover phase by
Bragg grating group 9 the controls and suitable sinusoidal signal of amplitude, when so that carrying out phase bit comparison in phase-comparison circuit 31,
The phase difference of controlled signal and original signal can be highly precisely compared, to accurately react sensing head (i.e. Prague
Grating group 9) environmental parameter that is detected.
Since optical fiber laser annular chamber (is generally sensed with bragg grating group 9 vulnerable to environment temperature at work
Pop one's head in not in same position) influence, therefore temperature compensation function has also been devised in the present invention, fills photonic crystal by dehydrated alcohol
Optical fiber 15, the second photo-coupler 16, photoelectric conversion circuit 17, analog to digital conversion circuit 18 are constituted.Dehydrated alcohol fills photonic crystal
Optical fiber 15 is temperature sensor, can cause to generate variation, Jin Ergai by the phase of its laser when the environmental temperature is changed
Become the output electric current of the first photoelectric conversion circuit, then be converted into digital signal input single-chip microcontroller 19 through analog to digital conversion circuit 18, uses
Measurement result bring error is given in the variation of the environment temperature locating for compensated optical fiber laser annular chamber.
Claims (3)
1. a kind of high-precision strain gauge based on bragg grating, structure have, pumping source (1) and the first optical coupling
The input terminal of device (2) is connected, and 90% output end of the first photo-coupler (2) is connected with the end 980nm of light wavelength division multiplexing (3),
The end 1550nm of light wavelength division multiplexing (3) is connected with one end of delay line adjustable optic fibre (12), and delay line adjustable optic fibre (12) is another
One end is connected with the input terminal of the first optoisolator (11), the control terminal and electrical level transferring chip of delay line adjustable optic fibre (12)
(13) output port is connected, and the input terminal of electrical level transferring chip (13) is connected with single-chip microcontroller (19);First optoisolator (11)
Output end be connected with the light input end of optical filter (10), the electric control end of optical filter (10) is connected with single-chip microcontroller (20),
The light output end of optical filter (10) is connected with the first port of optical circulator (8), the second port and Bradley of optical circulator (8)
One end of lattice grating group (9) is connected, and the third port of optical circulator (8) is connected with the input terminal of third photo-coupler (6), third
90% output end of photo-coupler (6) is connected with the input terminal of the second optoisolator (5), the output end of the second optoisolator (5)
It is connected with one end of Er-doped fiber (4), the other end of Er-doped fiber (4) is connected with the common end of light wavelength division multiplexing (3);Third
The 10% output end output of photo-coupler (6) is connected with the input terminal of the 4th photo-coupler (7), and the one of the 4th photo-coupler (7)
A output end is connected with an input terminal of the 5th photo-coupler (25), the another output of the 4th photo-coupler (7) with twine
The one end for being wound on the optical fiber on piezoelectric ceramics (24) is connected, and is wrapped in the other end and the 5th light of the optical fiber on piezoelectric ceramics (24)
Another input terminal of coupler (25) is connected, the input of the output end and the first optical detector (26) of the 5th photo-coupler (25)
End is connected, and the output end of the 5th photo-coupler (25) is also connected with the input terminal of the second optical detector (27);
It is characterized in that, structure is in addition, the output end of the first optical detector (26) and the homophase input of differential amplifier circuit (28)
End is connected, and the output end of the second optical detector (27) is connected with the inverting input terminal of differential amplifier circuit (28), differential amplification electricity
The input terminal of the output end and function translation circuit (29) on road (28) is connected, the output end of functional transformation circuit (29) and adaptive
The input terminal of amplitude normalizing circuit (30) is connected, the output end of adaptive amplitude normalizing circuit (30) and phase-comparison circuit (31)
An input terminal be connected;The input terminal in controllable frequency source (22) is connected with single-chip microcontroller (19), output end and phase-comparison circuit
(31) another input terminal is connected, and the output end of phase-comparison circuit (31) is connected with single-chip microcontroller (19);Controllable frequency source
(22) output end is also connected with the input terminal of PZT driving circuit (23), the output end and piezoelectric ceramics of PZT driving circuit (23)
(24) control terminal is connected;One input terminal phase of 10% output end of the first photo-coupler (2) and the second photo-coupler (16)
Even, another input terminal of the second photo-coupler (16) is connected with one end of dehydrated alcohol filling photonic crystal fiber (15), nothing
The other end of water-ethanol filling photonic crystal fiber (15) is connected with an output end of the second photo-coupler (16), the second optocoupler
The another output of clutch (16) is connected with the input terminal of photoelectric conversion circuit (17), the output end of photoelectricity shifting circuit (17) with
The input terminal of analog to digital conversion circuit (18) is connected, and the output end of analog to digital conversion circuit (18) is connected with single-chip microcontroller (19);Single-chip microcontroller
(19) also it is connected respectively with input key (14), serial communication modular (20), display screen (21);
The structure of the functional transformation circuit (29) 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 (29) is denoted as port ACOS_in, with
The output end of differential amplifier circuit (28) 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 (29), is denoted as port ACOS_out, with adaptive amplitude normalizing circuit (30)
Input terminal be connected;The model AD639 of the trigonometric function converter U1;
The structure of the adaptive amplitude normalizing circuit (30) is, one end of capacitor C9 and one end of resistance R3 and chip U2's
Pin 3 is connected, the other end ground connection of resistance R3, input of the other end of capacitor C9 as adaptive amplitude normalizing circuit (30)
End, is denoted as port ADAPT_in, and the port ACOS_out of and function translation circuit (29) is connected;The pin 1 of chip U2, pin 7,
Pin 8, pin 14 are grounded, and pin 2 is connected with+5V power supply with pin 4, and pin 11 is connected with pin 12 and with capacitor C5's
One end and+5V power supply are connected, the other end ground connection of capacitor C5;The pin 13 of chip U2 is connected with one end of capacitor C4, capacitor C4
The other end ground connection;The pin 9 of chip U2 is connected with one end of capacitor C6, the other end ground connection of capacitor C6;The pin 5 of chip U2
It is connected with one end of resistance R12 and resistance R11, the other end of resistance R12 ground connection, the other end of resistance R11 is defeated with amplifier U4's
One end of outlet and capacitor C8 are connected, the positive supply termination+5V power supply of amplifier U8, negative power end ground connection;The other end of capacitor C8
It is connected with one end of resistance R10, the other end of resistance R10 is connected with the non-inverting input terminal of amplifier U4;The anti-phase input of amplifier U4
It holds and is connected with the sliding end of sliding variohm W3, one end of slide rheostat W3 is connected with+5V power supply, slide rheostat W3's
Other end ground connection;One end of capacitor C7 is connected with the non-inverting input terminal of one end of resistance R9 and amplifier U4, the other end of capacitor C7
Ground connection, the other end of resistance R9 are connected with the output end of one end of resistance R7 and amplifier U3, the other end and amplifier U3 of resistance R7
Inverting input terminal be connected;One end of resistance R8 is connected with the non-inverting input terminal of amplifier U3, other end ground connection;The positive electricity of amplifier U3
Source connects+5V power supply, negative power end ground connection;Output end of the pin 10 of chip U2 as adaptive amplitude normalizing circuit (30),
It is denoted as port ADAPT_out, is connected with an input terminal of phase-comparison circuit (31);The pin 10 and diode D1 of chip U2
Anode be connected, the cathode of diode D1 is connected with one end of resistance R4, the other end of resistance R4 and one end of resistance R5 and fortune
The inverting input terminal for putting U3 is connected, and the other end of resistance R5 is connected with the anode of diode D2, the cathode of diode D2 and sliding
The sliding end of rheostat W2 is connected;One end of slide rheostat W2 is connected and is grounded with the cathode of diode D3, slide rheostat
The other end of W2 is connected with the anode of one end of resistance R6 and diode D3, another termination -5V power supply of resistance R6;The core
Piece U2 is variable gain amplifier chip, and model is AD8367;
The structure of the phase-comparison circuit (31) is one end of capacitor C10 and the non-inverting input terminal of amplifier U5 and resistance R13
One end be connected, an input terminal of the other end of capacitor C10 as phase-comparison circuit (31) is denoted as port PHASE_in1,
It is connected with the port ADAPT_out of adaptive amplitude normalizing circuit (30);The other end of resistance R13 is grounded;The positive electricity of amplifier U5
Source connects+5V power supply, negative power end ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U6A;D type flip flop
The port D of U6A is grounded;The one end capacitor C11 ground connection, the end PR of another termination d type flip flop U6A;Resistance R14 mono- terminates d type flip flop
The end PR of U6A, the end Q of another termination d type flip flop U6A;CLR termination+5V the power supply of d type flip flop U6A, the Q of d type flip flop U6A are non-
Terminate the end PR of d type flip flop U8A;One end of capacitor C12 is connected with one end of the non-inverting input terminal of amplifier U7 and resistance R15, electricity
Hold another input terminal of the other end of C12 as phase-comparison circuit (31), port PHASE_in2 is denoted as, with controllable frequency
The port SineM_out in source (22) is connected;The other end of resistance R15 is grounded;Positive supply termination+5V the power supply of amplifier U7, negative electricity
Source ground connection, reverse inter-input-ing ending grounding, the end CLK of output termination d type flip flop U6B;The port D of d type flip flop U6B is grounded;Capacitor
The one end C13 ground connection, the end PR of another termination d type flip flop U6B;Resistance R16 mono- terminates the end PR of d type flip flop U6B, another termination D
The end Q of trigger U6B;CLR termination+5V the power supply of d type flip flop U6B, the CLR of the Q non-terminated d type flip flop U8A of d type flip flop U6B
End;The end D and the end CLK of d type flip flop U8A is grounded, and output end of the end Q as phase-comparison circuit (31) is denoted as port
PHASE_out is connected with the input terminal of single-chip microcontroller (19);
The structure in the controllable frequency source (22) is the inverting input terminal of a termination amplifier U9 of thermistor Rt1, the other end
Connect the output end of amplifier U9;Resistance R17 mono- terminates the inverting input terminal of amplifier U9, and the other end is defeated as controllable frequency source (22)
Exit port is denoted as port SineM_out;The non-inverting input terminal of a termination amplifier U9 of resistance R18, other end ground connection;Amplifier U9
Positive supply termination+5V power supply, negative supply termination -5V power supply, export termination capacitor C14 one end;A termination core of capacitor C14
The pin 2 of piece U10;The pin 2 of a chip termination U10 of capacitor C15, the pin 2 of another chip termination U11;The one of capacitor C16
The pin 2 of chip termination U11, another termination port SineM_out;The pin 5 of a chip termination U10 of capacitor C17, the other end
Ground connection;The pin 5 of a chip termination U11 of capacitor C18, other end ground connection;The pin 1 and pin 10 of chip U10 connects+5V electricity
Source, pin 3, pin 4 and pin 6 are grounded;One end of 9 connecting resistance R19 of pin, one end of 8 connecting resistance R120 of pin, pin 7 connect
One end of resistance R21;An input port of the other end of resistance R19 as controllable frequency source (22), is denoted as port SineM_
in1;Another input port of the other end of resistance R20 as controllable frequency source (22), is denoted as port SineM_in2;Port
SineM_in1 and port SineM_in2 is connected with the input terminal of single-chip microcontroller (19);Another termination+5V power supply of resistance R21;Core
The pin 1 and pin 10 of piece U11 connects+5V power supply, and pin 3, pin 4 and pin 6 are grounded;One end of 9 connecting resistance R22 of pin, pipe
One end of 8 connecting resistance R23 of foot, one end of 7 connecting resistance R24 of pin;Another termination port SineM_in1 of resistance R22;Resistance
Another termination port SineM_in2 of R23;Another termination+5V power supply of resistance R24.
2. a kind of high-precision strain gauge based on bragg grating according to claim 1, which is characterized in that
The pumping source (1) is 980nm laser light source.
3. a kind of high-precision strain gauge based on bragg grating according to claim 1 or 2, feature exist
In the Bragg grating group (9) is made of 3 Bragg gratings, and the reflectivity of each grating is 90%, and bandwidth is
0.6nm, central wavelength are respectively 1550nm, 1560nm and 1630nm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810889077.7A CN109186824B (en) | 2018-08-07 | 2018-08-07 | A kind of high-precision strain gauge based on bragg grating |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810889077.7A CN109186824B (en) | 2018-08-07 | 2018-08-07 | A kind of high-precision strain gauge based on bragg grating |
Publications (2)
Publication Number | Publication Date |
---|---|
CN109186824A true CN109186824A (en) | 2019-01-11 |
CN109186824B CN109186824B (en) | 2019-11-19 |
Family
ID=64920788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201810889077.7A Expired - Fee Related CN109186824B (en) | 2018-08-07 | 2018-08-07 | A kind of high-precision strain gauge based on bragg grating |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN109186824B (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
CN104677421A (en) * | 2015-02-10 | 2015-06-03 | 中国科学技术大学先进技术研究院 | Optical fiber temperature and strain sensing device and method based on high spectral resolution technology |
CN206387446U (en) * | 2017-01-16 | 2017-08-08 | 中国计量大学 | The mine support wall temperature strain detection means of Brillouin's Raman fusion |
CN107134712A (en) * | 2017-06-26 | 2017-09-05 | 吉林大学 | A kind of passive mixed mode-locking optical fiber laser of master with temperature-compensating |
-
2018
- 2018-08-07 CN CN201810889077.7A patent/CN109186824B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
CN104677421A (en) * | 2015-02-10 | 2015-06-03 | 中国科学技术大学先进技术研究院 | Optical fiber temperature and strain sensing device and method based on high spectral resolution technology |
CN206387446U (en) * | 2017-01-16 | 2017-08-08 | 中国计量大学 | The mine support wall temperature strain detection means of Brillouin's Raman fusion |
CN107134712A (en) * | 2017-06-26 | 2017-09-05 | 吉林大学 | A kind of passive mixed mode-locking optical fiber laser of master with temperature-compensating |
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》 * |
Also Published As
Publication number | Publication date |
---|---|
CN109186824B (en) | 2019-11-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101532850B (en) | Method and device for sensing and demodulating Bragg fiber grating | |
CN102183318A (en) | Two-in-parallel high birefringence optical fiber sagnac interference ring multi-parameter sensor | |
CN105547336B (en) | Fiber grating sensing demodulation apparatus and method based on optoelectronic oscillation loop | |
CN103308144A (en) | Fiber Bragg grating vibration sensing measurement system and use method | |
CN105783951A (en) | Multichannel fiber bragg grating demodulation instrument | |
CN101319919B (en) | Method and device for demodulation of frequency domain optical fiber optical grating sensing network | |
CN101968508A (en) | All-fiber current sensor and polarization state control method thereof | |
CN108955970A (en) | A kind of microstress sensor for bridge monitoring | |
CN109059970B (en) | A kind of multi-channel long optical fiber sensing system | |
CN109186824B (en) | A kind of high-precision strain gauge based on bragg grating | |
CN109141674B (en) | A kind of optical fiber sensing system based on optical fiber laser | |
CN109029516B (en) | A kind of multipurpose optical fiber sensor | |
CN109100063B (en) | A kind of high-precision microstress sensor | |
CN204388875U (en) | Multi-channel fiber Bragg grating (FBG) demodulator | |
CN109029776B (en) | A kind of temperature sensor based on your interference structure of Mach Zehnder | |
CN109029775B (en) | A kind of system for detecting temperature based on Michelson interference structure | |
CN109029517B (en) | A kind of high-precision optical fiber sensor based on your interference structure of Mach Zehnder | |
CN109084817B (en) | A kind of fibre optical sensor based on sine wave modulation | |
CN109029772B (en) | A kind of temperature sensors of high precision | |
CN108827505A (en) | A kind of high-precision stress sensing system based on Michelson interference structure | |
CN109029773A (en) | A kind of temperature-sensing system for mining safety monitoring | |
CN109029806A (en) | A kind of strain gauge based on your interference structure of Mach Zehnder | |
CN109238533A (en) | A kind of microstress sensor based on phase bit comparison | |
CN109029518A (en) | A kind of fibre optical sensor based on Michelson interference | |
CN109029771A (en) | A kind of temperature detection device under adverse circumstances |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191119 Termination date: 20200807 |
|
CF01 | Termination of patent right due to non-payment of annual fee |