CN108007483A - A kind of fiber Bragg grating (FBG) demodulator and control method with automatic gain control function - Google Patents
A kind of fiber Bragg grating (FBG) demodulator and control method with automatic gain control function Download PDFInfo
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- CN108007483A CN108007483A CN201711162976.9A CN201711162976A CN108007483A CN 108007483 A CN108007483 A CN 108007483A CN 201711162976 A CN201711162976 A CN 201711162976A CN 108007483 A CN108007483 A CN 108007483A
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
- G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
Abstract
The invention discloses a kind of fiber Bragg grating (FBG) demodulator with automatic gain control function.Wherein, which includes wideband light source 1, coupler 2, spectral detection module 4, signal demodulating circuit 7；When fiber Bragg grating (FBG) demodulator starts, the reflected light signal of fiber-optic grating sensor 3 is converted into corresponding electric signal by spectral detection module 4 and is transmitted to signal demodulating circuit 7, spectral detection module 4 is transmitted to according to the big minor adjustment integral time signal of light intensity by signal demodulating circuit 7 again, spectral detection module 4 adjusts optical gain according to the length of integral time signal, realizes the automatic growth control of fiber Bragg grating (FBG) demodulator.The present invention uses the closed-loop feedback control method based on FPGA, saves a large amount of test calibration times, improves the efficiency of research and development of product；Meanwhile the error produced in artificial calibration process is reduced, improve the measurement accuracy of fiber Bragg grating (FBG) demodulator.
Description
Technical field
The present invention relates to a kind of fiber Bragg grating (FBG) demodulator, particularly a kind of fiber grating with automatic gain control function
(FBG) demodulator and its auto gain control method.
Background technology
It is rapid with optical fiber and Fibre Optical Communication Technology development since optical fiber sensing technology is the 1970s
A kind of New Sensing Technology to grow up, represents the development trend of new generation sensor.Fibre optical sensor can realize temperature
The measurement of a variety of physical quantitys such as degree, strain, electromagnetism and chemical composition, has high sensitivity, response speed compared with traditional sensors
Degree is fast, electromagnetism interference, corrosion-resistant, electric insulation, can flexing, easy to remote measurement the advantages that.
Fiber-optic grating sensor is the functional Fibre-Optic Sensors by the use of Fiber Bragg Grating FBG as sensing element, Ke Yizhi
Connect sensing temperature and strain and realize the indirect measurement of the other many physical quantitys related with temperature and strain and chemical quantity.Light
The sensing process of fiber grating sensor is that the modulation of fiber bragg grating center wavelength is realized by extraneous parameter, belongs to wavelength
Modulation fiber sensor, has the advantages that the various of fibre optical sensor.How and fiber bragg grating center wavelength is detected exactly
Minor shifts amount be the practical key technology of fiber-optic grating sensor.
Current fiber grating demodulation Technical comparing typically has：Matched FBG filter method, non-equilibrium Mach-Zehnder
Interferometer mode, tunable fiber grating filter method, tunable laser method, method based on spectral detection module etc..Its
The middle fiber bragg grating center wavelength demodulation techniques using spectral detection module are more common, and this method can realize continuous spectrum
Measure at the same time, without scanning, so that it is guaranteed that high-speed sampling and signal while property.But the light that every fiber Bragg grating (FBG) demodulator is applicable in
Electric conversion gain is different, needs to be demarcated by repeatedly testing before use, it is ensured that signal is within the scope of demodulation, traditional test
The scaling method time is grown, and influences research and development of products efficiency, and error is easily produced in calibration process, influences demodulation accuracy.
The content of the invention
Present invention solves the technical problem that it is：Having overcome the deficiencies of the prior art and provide one kind has automatic growth control
The fiber Bragg grating (FBG) demodulator and control method of function so that the fiber Bragg grating (FBG) demodulator opto-electronic conversion gain calibration time shortens, and has
Effect improves research and development of products efficiency.
The object of the invention is achieved by the following technical programs：A kind of fiber grating with automatic gain control function
(FBG) demodulator, including wideband light source, coupler, spectral detection module, signal demodulating circuit；The spectral detection module includes diffraction
Grating, detector array；
Wideband light source produces optical signal, testing fiber grating sensor is transmitted to through coupler, through testing fiber grating sensing
The reflected light of device is retransmited to coupler, and coupler is by reflected light pass to diffraction grating；The difference that diffraction grating will receive
The optical signal dispersion of wavelength is opened, and is transmitted to photodetector array, and photodetector array converts optical signals to analog electrical signal,
It is transmitted to signal demodulating circuit；
Signal demodulating circuit docks received analog electrical signal and is handled, and demodulates in testing fiber grating sensor
Cardiac wave is grown, while according to the intensity adjustment time of integration of the analog electrical signal received, by the time of integration after adjusting send to
Spectral detection module；
The length automatic adjustment opto-electronic conversion gain for the time of integration that spectral detection module is sent according to signal demodulating circuit
Value.
The signal demodulating circuit includes analog to digital conversion circuit, FPGA, DSP；Analog to digital conversion circuit receives photodetector
The analog electrical signal that array is sent, is converted to digital quantity by analog electrical signal, is transmitted to FPGA；
FPGA compared with given threshold, carries out integral time signal the digital quantity received according to comparative result
Adjustment, spectral detection module is transmitted to by the integral time signal after adjustment；
After the gain stabilization of spectral detection module, the corresponding digital quantity of optical signal is transmitted to DSP and carries out data solution by FPGA
Calculate, obtain the centre wavelength of testing fiber grating sensor.
The photodetector array includes 512 semiconductor InGaAs PIN type photodiodes, exports as 512 light
The spectrum of strong signal composition.
The specific side that the FPGA is adjusted integral time signal according to digital quantity and the comparative result of given threshold
Method is as follows：
Step 1：Number of the spectrum of photodetector array output through analog to digital conversion circuit conversion acquisition is read using FPGA
Maximum in word amount；Initial integration time is set as 21 sampling clock cycles；
Step 2：By maximum compared with given threshold：
When maximum is less than the 1/30 of given threshold, be expanded to 4 times of currency the time of integration；
When maximum is more than or equal to the 1/30 of given threshold, while is less than the 1/16 of given threshold, will expand the time of integration
Big arrive currency 2 times；
When maximum is more than or equal to the 1/16 of given threshold, while is less than the 1/8 of given threshold, will expand the time of integration
To 1.5 times of currency；
When maximum is more than or equal to the 1/8 of given threshold, while is less than the 1/4 of given threshold, will expand the time of integration
To 1.25 times of currency；
When maximum is more than or equal to the 1/4 of given threshold, while is less than the 2/3 of given threshold, will expand the time of integration
To 1.125 times of currency；
When maximum is more than or equal to the 2/3 of given threshold, be reduced into 0.75 times of currency the time of integration；
When maximum is more than or equal to the 1/3 of given threshold, while is less than the 3/5 of given threshold, the time of integration has adjusted
Finish.
The wideband light source is Er-Doped superfluorescent fiber source or super-radiance light emitting diode light source, wave-length coverage for 1510~
1595nm, minimum power are not less than 2mW.
The coupler is 2 × 2 fiber couplers, splitting ratio 1：1.
The spectral detection module uses 512 OEM of I-MON of Ibsen companies, Detection wavelength scope for 1510~
1595nm。
A kind of method that automatic growth control is carried out using the fiber Bragg grating (FBG) demodulator with automatic gain control function, bag
Include following steps：
Step 1：Optical signal is produced by wideband light source, testing fiber grating sensor is transmitted to through coupler, through testing fiber
The reflected light of grating sensor is retransmited to coupler, and coupler is by reflected light pass to diffraction grating；Diffraction grating will receive
To the optical signal dispersion of different wave length open, be transmitted to photodetector array, photodetector array converts optical signals to mould
Intend electric signal, be transmitted to signal demodulating circuit；
Step 2：Signal demodulating circuit docks received analog electrical signal and is handled, and demodulates testing fiber grating biography
The centre wavelength of sensor, while according to the intensity adjustment time of integration of the analog electrical signal received, during by integration after adjusting
Between send to spectral detection module；
Step 3：The length automatic adjustment photoelectricity for the time of integration that spectral detection module is sent according to signal demodulating circuit turns
Change the value of gain.
The signal demodulating circuit includes analog to digital conversion circuit, FPGA, DSP；
Analog to digital conversion circuit receives the analog electrical signal that photodetector array is sent, and analog electrical signal is converted to numeral
Amount, is transmitted to FPGA；
FPGA compared with given threshold, carries out integral time signal the digital quantity received according to comparative result
Adjustment, spectral detection module is transmitted to by the integral time signal after adjustment；After the gain stabilization of spectral detection module, FPGA will
The corresponding digital quantity of optical signal is transmitted to DSP and carries out data calculation, obtains the centre wavelength of testing fiber grating sensor.
The specific side that the FPGA is adjusted integral time signal according to digital quantity and the comparative result of given threshold
Method is as follows：
Step 1：Number of the spectrum of photodetector array output through analog to digital conversion circuit conversion acquisition is read using FPGA
Maximum in word amount；Initial integration time is set as 21 sampling clock cycles；
Step 2：By maximum compared with given threshold：
When maximum is less than the 1/30 of given threshold, be expanded to 4 times of currency the time of integration；
When maximum is more than or equal to the 1/30 of given threshold, while is less than the 1/16 of given threshold, will expand the time of integration
Big arrive currency 2 times；
When maximum is more than or equal to the 1/16 of given threshold, while is less than the 1/8 of given threshold, will expand the time of integration
To 1.5 times of currency；
When maximum is more than or equal to the 1/8 of given threshold, while is less than the 1/4 of given threshold, will expand the time of integration
To 1.25 times of currency；
When maximum is more than or equal to the 1/4 of given threshold, while is less than the 2/3 of given threshold, will expand the time of integration
To 1.125 times of currency；
When maximum is more than or equal to the 2/3 of given threshold, be reduced into 0.75 times of currency the time of integration；
When maximum is more than or equal to the 1/3 of given threshold, while is less than the 3/5 of given threshold, the time of integration has adjusted
Finish.
The present invention has the advantages that compared with prior art：
(1) present invention combines the 512 OEM spectral detection modules of I-MON of Ibsen companies, using closed loop feedback control side
Method, automatically adjusts the opto-electronic conversion gain of fiber Bragg grating (FBG) demodulator, saves a large amount of manual testing's nominal times, improves grinding for product
Send out efficiency；
(2) parallel control to spectral detection module can be realized based on FPGA, shortens the response of fiber Bragg grating (FBG) demodulator
Time；Meanwhile auto gain control method be the digital quantity converted according to spectral intensity with given threshold compared with, control is smart
Degree is high, reduces the error that artificial calibration process produces, and can improve the measurement accuracy of fiber Bragg grating (FBG) demodulator.
Brief description of the drawings
Fig. 1 is the fiber Bragg grating (FBG) demodulator hardware architecture diagram of the present invention；
Fig. 2 is that the FPGA of the fiber Bragg grating (FBG) demodulator of the present invention controls program flow diagram.
Embodiment
The present invention is described in further detail with specific implementation case below in conjunction with the accompanying drawings：
Fig. 1 is a kind of hardware configuration signal of fiber Bragg grating (FBG) demodulator with automatic gain control function of the present invention
Figure.
Fiber Bragg grating (FBG) demodulator includes：Wideband light source 1, coupler 2, spectral detection module 4, signal demodulating circuit 7；Its
In, the spectral detection module 4 is made of diffraction grating 5, detector array 6；The signal demodulating circuit 7 is by analog-to-digital conversion electricity
Road 8, FPGA9 and DSP10 compositions；Specifically, wideband light source 1 is Er-Doped superfluorescent fiber source or super-radiance light emitting diode light source, ripple
Long scope is 1510~1595nm, and minimum power is not less than 2mW.Coupler 2 is 2 × 2 fiber couplers, splitting ratio 1：1, can
Incident optical signal is divided into two-beam signal.Spectral detection module uses 512 OEM of I-MON of Ibsen companies, detects ripple
Long scope is 1510~1595nm, which can adjust the size of opto-electronic conversion gain according to input integral time length.Light
Electric explorer array 6 includes 512 semiconductor InGaAs PIN type photodiodes, exports what is formed for 512 light intensity signals
Spectrum.
Wideband light source 1 produces optical signal, and testing fiber grating sensor 3 is transmitted to through coupler 2, is passed through testing fiber grating
The reflected light of sensor 3 is retransmited to coupler 2, and coupler 2 is by reflected light pass to diffraction grating 5；Diffraction grating 5 will receive
The optical signal dispersion of different wave length open, be transmitted to photodetector array 6, photodetector array 6 converts optical signals to mould
Intend electric signal, be transmitted to signal demodulating circuit 7；
Signal demodulating circuit 7 includes analog to digital conversion circuit 8, FPGA9, DSP10；Analog to digital conversion circuit 8 receives photodetection
The analog electrical signal that device array 6 is sent, is converted to digital quantity by analog electrical signal, is transmitted to FPGA9；The number that FPGA9 will be received
Word amount is adjusted integral time signal compared with given threshold, according to comparative result, by the time of integration after adjustment
Signal is transmitted to spectral detection module 4；The length for the time of integration that spectral detection module 4 is sent according to signal demodulating circuit 7 is automatic
Adjust the value of opto-electronic conversion gain.After the gain stabilization of spectral detection module 4,
The corresponding digital quantity of optical signal is transmitted to DSP10 and carries out data calculation by FPGA9, obtains testing fiber grating sensor
3 centre wavelength.
Fig. 2 is that a kind of FPGA of fiber Bragg grating (FBG) demodulator with automatic gain control function of the present invention controls program flow
Cheng Tu；As shown in Fig. 2, when fiber Bragg grating (FBG) demodulator powers on, first to Program reset, initial integration time is then set as 21
A sampling clock cycle (frequency 1MHz).FPGA will read signal maximum in photodetector array output spectrum, by this
Maximum is compared with given threshold (being set as 10000), so as to adjust the time of integration, specific comparative approach is as follows：
When maximum is less than the 1/30 of given threshold, be expanded to 4 times of currency the time of integration；
When maximum is more than or equal to the 1/30 of given threshold, while is less than the 1/16 of given threshold, will expand the time of integration
Big arrive currency 2 times；
When maximum is more than or equal to the 1/16 of given threshold, while is less than the 1/8 of given threshold, will expand the time of integration
To 1.5 times of currency；
When maximum is more than or equal to the 1/8 of given threshold, while is less than the 1/4 of given threshold, will expand the time of integration
To 1.25 times of currency；
When maximum is more than or equal to the 1/4 of given threshold, while is less than the 2/3 of given threshold, will expand the time of integration
To 1.125 times of currency；
When maximum is more than or equal to the 2/3 of given threshold, be reduced into 0.75 times of currency the time of integration；
When maximum is more than or equal to the 1/3 of given threshold, while is less than the 3/5 of given threshold, the time of integration has adjusted
Finish.
It is a kind of to carry out automatic growth control using the fiber Bragg grating (FBG) demodulator with automatic gain control function
Method, includes the following steps：
Step 1：Optical signal is produced by wideband light source 1, testing fiber grating sensor 3 is transmitted to through coupler 2, through to be measured
The reflected light of fiber-optic grating sensor 3 is retransmited to coupler 2, and coupler 2 is by reflected light pass to diffraction grating 5；Diffraction light
Grid 5 open the optical signal dispersion of the different wave length received, are transmitted to photodetector array 6, and photodetector array 6 believes light
Number analog electrical signal is converted to, is transmitted to signal demodulating circuit 7；
Step 2：Signal demodulating circuit 7 docks received analog electrical signal and is handled, and demodulates testing fiber grating biography
The centre wavelength of sensor 3, while according to the intensity adjustment time of integration of the analog electrical signal received, during by integration after adjusting
Between send to spectral detection module 4；
Step 3：The length automatic adjustment photoelectricity for the time of integration that spectral detection module 4 is sent according to signal demodulating circuit 7
The value of conversion gain.
The present invention combines the 512 OEM spectral detection modules of I-MON of Ibsen companies, using the closed loop feedback based on FPGA
A kind of control method, it is proposed that fiber Bragg grating (FBG) demodulator with automatic gain control function.Opto-electronic conversion can be automatically adjusted
Gain, saves a large amount of test calibration times, improves the efficiency of research and development of product；Meanwhile reduce the mistake produced in artificial calibration process
Difference, improves the measurement accuracy of fiber Bragg grating (FBG) demodulator；Again since FPGA has the characteristics that parallel work-flow, fiber grating solution can be shortened
The response time of tune.
The content not being described in detail in description of the invention belongs to the known technology of professional and technical personnel in the field.
Claims (10)
1. a kind of fiber Bragg grating (FBG) demodulator with automatic gain control function, it is characterised in that including wideband light source (1), coupling
Clutch (2), spectral detection module (4), signal demodulating circuit (7)；The spectral detection module (4) includes diffraction grating (5), visits
Survey device array (6)；
Wideband light source (1) produces optical signal, testing fiber grating sensor (3) is transmitted to through coupler (2), through testing fiber grating
The reflected light of sensor (3) retransmits to coupler (2), coupler (2) and gives reflected light pass to diffraction grating (5)；Diffraction light
Grid (5) open the optical signal dispersion of the different wave length received, are transmitted to photodetector array (6), photodetector array (6)
Analog electrical signal is converted optical signals to, is transmitted to signal demodulating circuit (7)；
Signal demodulating circuit (7) docks received analog electrical signal and is handled, and demodulates testing fiber grating sensor (3)
Centre wavelength, while according to the intensity adjustment time of integration of the analog electrical signal received, the time of integration after adjusting is sent
To spectral detection module (4)；
The length automatic adjustment opto-electronic conversion for the time of integration that spectral detection module (4) is sent according to signal demodulating circuit (7) increases
The value of benefit.
A kind of 2. fiber Bragg grating (FBG) demodulator with automatic gain control function according to claim 1, it is characterised in that：
The signal demodulating circuit (7) includes analog to digital conversion circuit (8), FPGA (9), DSP (10)；Analog to digital conversion circuit (8) receives light
The analog electrical signal that electric explorer array (6) is sent, is converted to digital quantity by analog electrical signal, is transmitted to FPGA (9)；
FPGA (9) compared with given threshold, carries out integral time signal the digital quantity received according to comparative result
Adjustment, spectral detection module (4) is transmitted to by the integral time signal after adjustment；
After the gain stabilization of spectral detection module (4), the corresponding digital quantity of optical signal is transmitted to DSP (10) and carried out by FPGA (9)
Data calculation, obtains the centre wavelength of testing fiber grating sensor (3).
A kind of 3. fiber Bragg grating (FBG) demodulator with automatic gain control function according to claim 2, it is characterised in that：
The photodetector array (6) includes 512 semiconductor InGaAsPIN type photodiodes, exports as 512 light intensity signals
The spectrum of composition.
A kind of 4. fiber Bragg grating (FBG) demodulator with automatic gain control function according to claim 2, it is characterised in that：
The specific method that the FPGA (9) is adjusted integral time signal according to digital quantity and the comparative result of given threshold is such as
Under：
Step 1：The spectrum of photodetector array (6) output is read through analog to digital conversion circuit (8) conversion acquisition using FPGA
Maximum in digital quantity；Initial integration time is set as 21 sampling clock cycles；
Step 2：By maximum compared with given threshold：
When maximum is less than the 1/30 of given threshold, be expanded to 4 times of currency the time of integration；
When maximum is more than or equal to the 1/30 of given threshold, while is less than the 1/16 of given threshold, will be expanded to the time of integration
2 times of currency；
When maximum is more than or equal to the 1/16 of given threshold, while is less than the 1/8 of given threshold, it will be expanded to the time of integration and work as
1.5 times of preceding value；
When maximum is more than or equal to the 1/8 of given threshold, while is less than the 1/4 of given threshold, it will be expanded to the time of integration and work as
1.25 times of preceding value；
When maximum is more than or equal to the 1/4 of given threshold, while is less than the 2/3 of given threshold, it will be expanded to the time of integration and work as
1.125 times of preceding value；
When maximum is more than or equal to the 2/3 of given threshold, be reduced into 0.75 times of currency the time of integration；
When maximum is more than or equal to the 1/3 of given threshold, while is less than the 3/5 of given threshold, time of integration adjustment finishes.
A kind of 5. fiber Bragg grating (FBG) demodulator with automatic gain control function according to claim 1, it is characterised in that：
The wideband light source (1) is Er-Doped superfluorescent fiber source or super-radiance light emitting diode light source, and wave-length coverage is 1510~1595nm, most
Small-power is not less than 2mW.
A kind of 6. fiber Bragg grating (FBG) demodulator with automatic gain control function according to claim 1, it is characterised in that：
The coupler (2) is 2 × 2 fiber couplers, splitting ratio 1：1.
A kind of 7. fiber Bragg grating (FBG) demodulator with automatic gain control function according to claim 1, it is characterised in that：
The spectral detection module (4) uses 512 OEM of I-MON of Ibsen companies, and Detection wavelength scope is 1510~1595nm.
8. a kind of fiber Bragg grating (FBG) demodulator with automatic gain control function using as described in claim 1~7 carries out certainly
The method of dynamic gain control, it is characterised in that include the following steps：
Step 1：Optical signal is produced by wideband light source (1), testing fiber grating sensor (3) is transmitted to through coupler (2), through treating
The reflected light for surveying fiber-optic grating sensor (3) is retransmited to coupler (2), and coupler (2) is by reflected light pass to diffraction grating
(5)；Diffraction grating (5) opens the optical signal dispersion of the different wave length received, is transmitted to photodetector array (6), and photoelectricity is visited
Survey device array (6) and convert optical signals to analog electrical signal, be transmitted to signal demodulating circuit (7)；
Step 2：Signal demodulating circuit (7) docks received analog electrical signal and is handled, and demodulates testing fiber grating sensing
The centre wavelength of device (3), while according to the intensity adjustment time of integration of the analog electrical signal received, during by integration after adjusting
Between send to spectral detection module (4)；
Step 3：The length automatic adjustment photoelectricity for the time of integration that spectral detection module (4) is sent according to signal demodulating circuit (7)
The value of conversion gain.
It is 9. according to claim 8 a kind of automatic using the fiber Bragg grating (FBG) demodulator progress with automatic gain control function
The method of gain control, it is characterised in that：The signal demodulating circuit (7) includes analog to digital conversion circuit (8), FPGA (9), DSP
(10)；
Analog to digital conversion circuit (8) receives the analog electrical signal that photodetector array (6) is sent, and analog electrical signal is converted to number
Word amount, is transmitted to FPGA (9)；
FPGA (9) compared with given threshold, carries out integral time signal the digital quantity received according to comparative result
Adjustment, spectral detection module (4) is transmitted to by the integral time signal after adjustment；After the gain stabilization of spectral detection module (4),
The corresponding digital quantity of optical signal is transmitted to DSP (10) and carries out data calculation by FPGA (9), obtains testing fiber grating sensor (3)
Centre wavelength.
10. a kind of fiber Bragg grating (FBG) demodulator progress used with automatic gain control function according to claim 9 is certainly
The method of dynamic gain control, it is characterised in that：
The specific method that the FPGA (9) is adjusted integral time signal according to digital quantity and the comparative result of given threshold
It is as follows：
Step 1：The spectrum of photodetector array (6) output is read through analog to digital conversion circuit (8) conversion acquisition using FPGA
Maximum in digital quantity；Initial integration time is set as 21 sampling clock cycles；
Step 2：By maximum compared with given threshold：
When maximum is less than the 1/30 of given threshold, be expanded to 4 times of currency the time of integration；
When maximum is more than or equal to the 1/30 of given threshold, while is less than the 1/16 of given threshold, will be expanded to the time of integration
2 times of currency；
When maximum is more than or equal to the 1/16 of given threshold, while is less than the 1/8 of given threshold, it will be expanded to the time of integration and work as
1.5 times of preceding value；
When maximum is more than or equal to the 1/8 of given threshold, while is less than the 1/4 of given threshold, it will be expanded to the time of integration and work as
1.25 times of preceding value；
When maximum is more than or equal to the 1/4 of given threshold, while is less than the 2/3 of given threshold, it will be expanded to the time of integration and work as
1.125 times of preceding value；
When maximum is more than or equal to the 2/3 of given threshold, be reduced into 0.75 times of currency the time of integration；
When maximum is more than or equal to the 1/3 of given threshold, while is less than the 3/5 of given threshold, time of integration adjustment finishes.
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