CN105241482A - Active fiber grating sensor wavelength demodulation system and method - Google Patents
Active fiber grating sensor wavelength demodulation system and method Download PDFInfo
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Abstract
The invention relates to an active fiber grating sensor wavelength demodulation system and method. The active fiber grating sensor wavelength demodulation system comprises a pump light source, a wavelength division multiplexing device, a beam combiner, a broadband light source, a light attenuator, a thermally-stabilized etalon, a coupler, a tunable filter, a photo-detector, and a control and signal processor. The beam combiner merges sensing light with standard comb-shaped spectrum output from the etalon. The light attenuator is used for reducing the intensity of the comb-shaped spectrum, so merged light emitted from the beam combiner forms spectrum which takes the high-intensity sensing light as main light and takes low-intensity comb-shaped spectrum as a background. The tunable filter scans and measures the merged spectrum under the driving of linear voltages. The demodulation method includes the three data processing steps: locating the spectral peak of a measured optical signal, determining the spectral peak and calculating the wavelength. In this way, accurate demodulation for the wavelength of sensing light of an active fiber sensor is achieved. The beneficial effects of the invention are that the system is simple in structure, high in integration, low in cost and high in measuring precision, is steady and reliable, etc.
Description
Technical field
The invention belongs to fiber optic sensor technology field, is a kind of Active Optical Fiber grating sensor Wavelength demodulation system and method.
Background technology
Fiber-optic grating sensor is the characteristic such as volume is little, lightweight, electromagnetism interference, corrosion-resistant, temperature tolerance good, multiplexing capacity is strong, Distance Transmission is far away, sensitivity is high owing to having, and has been widely used in the industry spot such as hydraulic and electric engineering, chemical engineering of materials.
Fiber-optic grating sensor is the characteristic utilizing fiber grating reflected light wavelength with temperature, STRESS VARIATION, realizes the measurement of physical quantity, and therefore the measurement precision of fiber grating reflected light wavelength determines the performance of sensor.But the reflectance spectrum width of the fiber grating generally used at present is Subnano-class, the reflective spectral property of optical fiber grid width inherently limits the accuracy of reflection wavelength measurement, and then constrain the further raising of the performance index such as resolution, sensitivity of fiber-optic grating sensor, make existing fiber-optic grating sensor be difficult to meet the requirement of the high-acruracy survey such as high-resolution, high sensitivity.
Active Optical Fiber grating sensor is using active phase-shifted fiber grating as sensing unit, the emergent light spectral line width that it produces under pump light incidence is extremely narrow, be only kHz magnitude, therefore relative to ordinary optic fibre grating sensor, Active Optical Fiber grating sensor can realize the physical quantity of more high-resolution and sensitivity, can meet high-acruracy survey demand.
For Active Optical Fiber grating sensor, the measurement of its sense light wavelength realizes by modes such as spectrographic method, interferometric demodulation methods, and the Wavelength scanning method being applied to ordinary optic fibre grating sensor is no longer applicable.Spectrographic method is the measurement utilizing beam splitter to realize optical wavelength, and this systemic resolution is low, and price is more expensive, and demodulation speed is slow; Interferometer mode demodulation speed is fast, and precision is high, but system stability is poor, is subject to external disturbance impact.Therefore how accurately, the optical wavelength of demodulation Active Optical Fiber grating sensor delicately, realize the low cost of demodulating system, integrated and reliable and stable be the key of Active Optical Fiber grating sensor propagation and employment.
Summary of the invention
For realizing the high precision demodulation of Active Optical Fiber grating sensor sense light wavelength, solve the difficult problem that Active Optical Fiber grating wavelength demodulating system has integrated, low cost, the characteristic such as reliable and sensitive simultaneously, and a kind of Active Optical Fiber grating sensor Wavelength demodulation method is provided, one realizes length scanning with adjustable filter, realizes the Active Optical Fiber grating wavelength demodulation method of Wavelength calibration with etalon.
The object of the invention is to have come by following technical solution.This Active Optical Fiber grating sensor Wavelength demodulation system, be made up of pump light source, wavelength division multiplexer, bundling device, wideband light source, optical attenuator, thermally-stabilised etalon, coupling mechanism, tunable optic filter, photo-detector and control and signal processor, wherein pump light source is for encouraging Active Optical Fiber grating, and produces the sense light of 1550nm wave band by interleaver; Wideband light source and etalon are for generation of the comb δ function formula of standard; The comb δ function formula of sensing spectrum and standard closes by bundling device to be restrainted formation and converges spectrum; The comb δ function formula intensity that optical attenuator exports for reducing etalon, make the intensity of spectral line light intensity lower than sense light of comb δ function formula, the Spectrum Formation that converges exported through bundling device is formed based on the spectrum that the sense light of high strength, low-intensity comb δ function formula are background; Tunable optic filter completes the right scanning converging spectrum under the driving controlling the sawtooth wave control signal exported with signal processor, by controlling the Acquire and process with signal processor settling signal after photo-detector completes the detection of scanning optical spectrum.
Pump light source selects wavelength to be the laser instrument of 980nm or 1480nm; According to the optical wavelength of pump light source, the operation wavelength that wavelength division multiplexer is selected is 980nm/1550nm or 1480nm/1550nm, with the partial wave realizing the sense light that pump light and wave band are 1550nm with close ripple.
The port of the exit end operation wavelength identical with wavelength division multiplexer of pump light source connects, and the conjunction ripple end of wavelength division multiplexer connects with Active Optical Fiber grating sensor, and in wavelength division multiplexer, service band is that the port of 1550nm is connected with a branch end of bundling device; The bright dipping end of wideband light source connects with optical attenuator one end, and the other end of optical attenuator connects with the inlet end of thermally-stabilised etalon, and the endpiece of etalon is connected with another branch end of bundling device; Bundling device is connected with one end of tunable optic filter after sense light is become to converge spectrum with the outgoing combiner of etalon, and the output terminal of tunable optic filter is connected with photo-detector, and the output terminal of photo-detector is connected with signal processor with control.
This Active Optical Fiber grating sensor Wavelength demodulation method of the present invention, the method comprise spectrum peak seek position, spectrum peak judge and wavelength calculate three parts, wherein spectrum peak is sought position employing and is included but not limited to that Gauss curve fitting method carries out peak-seeking process to the light intensity signal array that detection gathers, and obtains location index and the intensity at each spectrum peak; Compose the light-intensity difference according to sense light and pectination spectral line in peak judgement, sensing spectrum and standard comb spectrum are divided in each spectrum peak in peak-seeking result; Wavelength composes the location index at peak and the standard wave long value of comb δ function formula according to comb spectrum peak and sensing in calculating, and adopts and includes but not limited to that quadratic fit method calculates the wavelength value obtaining sensing spectrum peak.
Beneficial effect of the present invention is:
A, the present invention adopt the Wavelength scanning method of tunable optic filter, make demodulating system have speed fast, highly sensitive characteristic.
The mode that b, the present invention adopt high strength sensing spectrum to superpose with low-intensity standard comb spectrum, achieves the demarcation of etalon comb δ function formula to sensing spectrum, makes system can measure the absolute wavelength of Active Optical Fiber grating, and have high measuring accuracy.
C, the present invention adopt tunable optic filter and thermally-stabilised etalon as the core devices of system, make system stability, reliably, be not subject to external environmental interference.
D, Active Optical Fiber grating wavelength demodulating system structure of the present invention are simple, and integrated level is high, and cost is lower, has engineering practical value.
Accompanying drawing explanation
Fig. 1 Active Optical Fiber grating wavelength demodulating system schematic diagram;
Fig. 2 scanning survey spectrum schematic diagram.
Wherein: 1 sensing spectrum, the standard comb that 2 etalons export composes peak.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described:
See Fig. 1 and Fig. 2, the Active Optical Fiber grating wavelength demodulating system that the present invention proposes is made up of pump light source, wavelength division multiplexer, wideband light source, optical attenuator, thermally-stabilised etalon, bundling device, tunable optic filter, photo-detector and control and signal processor, and implementation process is:
(1) pump light source selects wavelength to be the laser instrument of 980nm or 1480nm; According to the optical wavelength of pump light source, the operation wavelength that wavelength division multiplexer is selected is 980nm/1550nm or 1480nm/1550nm, with the partial wave realizing the sense light that pump light and wave band are 1550nm with close ripple.
(2) port of the exit end of pump light source operation wavelength identical with wavelength division multiplexer connects, the conjunction ripple end of wavelength division multiplexer connects with Active Optical Fiber grating sensor, and in wavelength division multiplexer, service band is that the port of 1550nm is connected with a branch end of bundling device.
(3) the bright dipping end of wideband light source connects with optical attenuator one end, and the other end of optical attenuator connects with the inlet end of thermally-stabilised etalon, and the endpiece of etalon is connected with another branch end of bundling device.
(4) bundling device is connected with one end of tunable optic filter after sense light and the outgoing combiner of etalon being formed and converging spectrum, and the output terminal of tunable optic filter is connected with photo-detector, and the output terminal of photo-detector is connected with signal processor with control.
(5) the comb δ function formula intensity that the optical attenuator described in exports for reducing etalon, make its spectral line light intensity lower than the intensity of sense light, the Spectrum Formation that converges exported through bundling device is formed, as shown in Figure 2 based on the spectrum that the sense light of high strength, low-intensity comb δ function formula are background.
(6) tunable optic filter completes the right scanning converging spectrum under the driving controlling the sawtooth wave control signal exported with signal processor, by controlling the Acquire and process with signal processor settling signal after detector completes the detection of scanning optical spectrum.
(7) the light intensity signal array gathered detection adopts and includes but not limited to that Gauss curve fitting method carries out peak-seeking process, obtains location index and the intensity at each spectrum peak
(8) according to the light-intensity difference of sense light and pectination spectral line, sensing spectrum and standard comb spectrum are divided in each spectrum peak in peak-seeking result.
(9) compose the location index at peak and the standard wave long value of comb δ function formula according to comb spectrum peak and sensing, adopt and include but not limited to that quadratic fit method calculates the wavelength value obtaining sensing spectrum peak.
(10) described wideband light source selects ASE light source, and the demodulation spectral range of system is 1525nm ~ 1565nm.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (4)
1. an Active Optical Fiber grating sensor Wavelength demodulation system, it is characterized in that: be made up of pump light source, wavelength division multiplexer, bundling device, wideband light source, optical attenuator, thermally-stabilised etalon, coupling mechanism, tunable optic filter, photo-detector and control and signal processor, wherein pump light source is for encouraging Active Optical Fiber grating, and produces the sense light of 1550nm wave band by interleaver; Wideband light source and etalon are for generation of the comb δ function formula of standard; The comb δ function formula of sensing spectrum and standard closes by bundling device to be restrainted formation and converges spectrum; The comb δ function formula intensity that optical attenuator exports for reducing etalon, make the intensity of spectral line light intensity lower than sense light of comb δ function formula, the Spectrum Formation that converges exported through bundling device is formed based on the spectrum that the sense light of high strength, low-intensity comb δ function formula are background; Tunable optic filter completes the right scanning converging spectrum under the driving controlling the sawtooth wave control signal exported with signal processor, by controlling the Acquire and process with signal processor settling signal after photo-detector completes the detection of scanning optical spectrum.
2. Active Optical Fiber grating sensor Wavelength demodulation system according to claim 1, is characterized in that: pump light source selects wavelength to be the laser instrument of 980nm or 1480nm; According to the optical wavelength of pump light source, the operation wavelength that wavelength division multiplexer is selected is 980nm/1550nm or 1480nm/1550nm, with the partial wave realizing the sense light that pump light and wave band are 1550nm with close ripple.
3. Active Optical Fiber grating sensor Wavelength demodulation system according to claim 1, it is characterized in that: the port of the exit end operation wavelength identical with wavelength division multiplexer of pump light source connects, the conjunction ripple end of wavelength division multiplexer connects with Active Optical Fiber grating sensor, and in wavelength division multiplexer, service band is that the port of 1550nm is connected with a branch end of bundling device; The bright dipping end of wideband light source connects with optical attenuator one end, and the other end of optical attenuator connects with the inlet end of thermally-stabilised etalon, and the endpiece of etalon is connected with another branch end of bundling device; Bundling device is connected with one end of tunable optic filter after sense light is become to converge spectrum with the outgoing combiner of etalon, and the output terminal of tunable optic filter is connected with photo-detector, and the output terminal of photo-detector is connected with signal processor with control.
4. one kind adopts the demodulation method as active fiber grating sensor wavelength demodulating system, it is characterized in that: the method comprise spectrum peak seek position, spectrum peak judge and wavelength calculate three parts, wherein spectrum peak is sought position employing and is included but not limited to that Gauss curve fitting method carries out peak-seeking process to the light intensity signal array that detection gathers, and obtains location index and the intensity at each spectrum peak; Compose the light-intensity difference according to sense light and pectination spectral line in peak judgement, sensing spectrum and standard comb spectrum are divided in each spectrum peak in peak-seeking result; Wavelength composes the location index at peak and the standard wave long value of comb δ function formula according to comb spectrum peak and sensing in calculating, and adopts and includes but not limited to that quadratic fit method calculates the wavelength value obtaining sensing spectrum peak.
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| CN107228728A (en) * | 2017-06-30 | 2017-10-03 | 石家庄赫德光电科技有限公司 | A kind of high ferro suspension power supply cable force monitoring tension sensor and monitoring system |
| CN108362312A (en) * | 2018-02-28 | 2018-08-03 | 山东省科学院激光研究所 | Wavelength demodulation device and system |
| CN109489699A (en) * | 2019-01-07 | 2019-03-19 | 福州大学 | A kind of fiber grating distortion spectrum demodulation method |
| CN110082068A (en) * | 2019-03-25 | 2019-08-02 | 中国船舶重工集团公司第七一五研究所 | A kind of optic fiber grating wavelength demodulating system and method with wavelength debugging functions |
| CN110411564A (en) * | 2019-08-23 | 2019-11-05 | 厦门大学 | A kind of all band is without the long standard sources of empty window wave and Wavelength calibration method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107228728A (en) * | 2017-06-30 | 2017-10-03 | 石家庄赫德光电科技有限公司 | A kind of high ferro suspension power supply cable force monitoring tension sensor and monitoring system |
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| CN110082068A (en) * | 2019-03-25 | 2019-08-02 | 中国船舶重工集团公司第七一五研究所 | A kind of optic fiber grating wavelength demodulating system and method with wavelength debugging functions |
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