CN1309188C - Ultra high speed optical fiber grating sensor demodulating system and its realizing method - Google Patents
Ultra high speed optical fiber grating sensor demodulating system and its realizing method Download PDFInfo
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- CN1309188C CN1309188C CNB021376514A CN02137651A CN1309188C CN 1309188 C CN1309188 C CN 1309188C CN B021376514 A CNB021376514 A CN B021376514A CN 02137651 A CN02137651 A CN 02137651A CN 1309188 C CN1309188 C CN 1309188C
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Abstract
The present invention relates to a demodulating system for a superspeed optical fiber grating sensor and an implementation method of the demodulating system. The method comprises: an inaccurate sine function optical element, an inaccurate cosine function optical element and the known wavelength optical signal power of the monitoring end are processed by the relationship of the transmissivity and the wavelength which are respectively received by a detector; a lookup table of two transmissivitys, the ratio of the transmissivitys, the phi(lambda) value of the arc tangent function value of the ratio, and a standard wavelength is obtained, and is stored in a demodulating system storage, and the calibration of the system is realized; the power of optical signals which are received by the detector from a sensing head of a fiber grating is processed, and the two transmissivitys and the ratio of the transmissivitys are obtained; two or a plurality of phase position values and wavelength values which are proximal to the transmissivitys and the ratio of the transmissivitys are obtained by the lookup table in the system storage, and measured wavelength values are obtained by a linear or nonlinear interpolation, and are converted into corresponding measured sensing quantity. The present invention has the characteristics of superhigh demodulation speed, wide demodulation range, high resolution and low cost.
Description
(1) technical field
The present invention relates to optical fiber communication and Fibre Optical Sensor and laser technology field, particularly a kind of ultra high speed optical fiber grating sensor demodulating system and its implementation.
(2) background technology
Fiber-optic grating sensor is based on outside effect to it, causes the variation of its grating region refractive index or pitch, thereby causes the mobile as sensor mechanism of its reflection wavelength.The essence of its demodulation measured signal then is the measurement of wavelength amount of movement.Demodulating system that has occurred at present and method mainly contain except that traditional scanning spectrometer and scanning interferometer:
1, based on linear edges band filter method (United States Patent (USP) 5,729,347)
2, based on the relevant coupler approach (United States Patent (USP) 5,882,049) of wavelength
3, based on chirp grating method (United States Patent (USP) 6,335,524)
4, based on phase carrier (PGC) method (United States Patent (USP) 5,903,350)
5, based on the fixed spectrometer of volume holographic grating+detector array
Although first three methods has the advantage of high speed demodulation, resolution is low, and the demodulation scope is narrow relatively, the 4th kind of method demodulation wide ranges, but its demodulation speed is subjected to the restriction of interferometer modulating speed, and the 5th kind of method cost is too high, and demodulation speed is also not high, and the product of tens Hz is only arranged at present.
(3) summary of the invention
The objective of the invention is to: propose a kind of different with method before low ultra high speed optical fiber grating sensor demodulation method of superelevation demodulation speed, demodulation wide ranges, resolution height and cost that has.
The object of the present invention is achieved like this:
A kind of ultra high speed optical fiber grating sensor demodulation method, the demodulating system that described demodulation method uses comprises: a light source; Two couplers, first coupler and second coupler, the tie point between two couplers are the Q point; Transmitance and wavelength relationship are the optical element that the SIN function of error is arranged; Transmitance and wavelength relationship are the optical element that the cosine function of error is arranged; Three detectors; A signal processing module; A display module; Described light source passes through described first coupler with light wave, reach described optical fiber grating sensing head, described grating sensing head is after measured effect, the reflecting light long hair is given birth to and is moved, again through described first and second couplers, be that the optical element of SIN function of error and transmitance and wavelength relationship are arranged is optical element and the output of optical power monitoring end that the cosine function of error is arranged by described transmitance and wavelength relationship respectively, survey after described signal processing module is handled the tested value of back output institute's wavelength amount of movement of surveying and its correspondence to this display module by described detector, it is characterized in that described demodulation method comprises:
(1) step of system calibration: at first the light signal of known wavelength is substituted described light source and optical fiber grating sensing head from demodulating system first coupler and the described demodulating system of optical fiber tie point Q point injection between second coupler, with closing by transmitance and wavelength X respectively of receiving of described three detectors is the optical element of SIN function of wrong difference and transmitance and the wavelength X pass is the optical element of cosine function of wrong difference and the luminous power Da of monitoring side, Db and Dc, the described signal processing module of the warp let-off is handled transmitance Ta and Tb and the ratio thereof that obtains described two optical elements, and then draw Ta/Tb and arctan function value Φ (λ) thereof and standard wave length's lookup table, and deposit in the memory of described signal processing module, and optical fiber tie point Q point is recovered to connect;
The mathematical relationship each other of arctan function value Φ (λ) value of described transmitance Ta, transmitance Tb, wavelength X value and two signal ratios is:
Ta∝sinΦ(λ)
Tb∝cosΦ(λ)，
∝ is approximate direct ratio symbol in the above-mentioned formula, and ≈ is for being approximately equal to symbol, Ta=Da/Dc, and Tb=Db/Dc, wherein Da, Db, Dc are described three optical signal powers that detector detects respectively;
(2) step of survey sensing amount: via the demodulating system after the above-mentioned calibration, the luminous power Da from described optical fiber grating sensing head, Db and Dc that described three detectors are received, obtain described transmitance Ta and Tb and ratio thereof through described signal processing module, by the lookup table in the memory of this signal processing module, obtain and this ratio immediate adjacent two or more phase values and wavelength value, give linearity or non-linear interpolation again and obtain the wavelength value of surveying, be converted into corresponding tested sensing amount then.
A kind of ultra high speed optical fiber grating sensor demodulation method, the demodulating system that described demodulation method uses comprises: a light source; Two couplers, first coupler and second coupler, the tie point between two couplers are the Q point; Transmitance and wavelength relationship are the optical element that the SIN function of error is arranged; Transmitance and wavelength relationship are the optical element that the cosine function of error is arranged; Three detectors; A signal processing module; A display module; Described light source passes through described first coupler with light wave, reach described optical fiber grating sensing head, described grating sensing head is after measured effect, the reflecting light long hair is given birth to and is moved, again through described first and second couplers, be that the optical element of SIN function of error and transmitance and wavelength relationship are arranged is optical element and the output of optical power monitoring end that the cosine function of error is arranged by described transmitance and wavelength relationship respectively, survey after described signal processing module is handled the tested value of back output institute's wavelength amount of movement of surveying and its correspondence to this display module by described detector, it is characterized in that described demodulation method comprises:
(1) step of system calibration: at first the light signal of known wavelength is substituted described light source and optical fiber grating sensing head from demodulating system first coupler and the described demodulating system of optical fiber tie point Q point injection between second coupler, with closing by transmitance and wavelength X respectively of receiving of described three detectors is the optical element of SIN function of wrong difference and transmitance and the wavelength X pass is the optical element of cosine function of wrong difference and the luminous power D ' a of monitoring side, D ' b and D ' c, the described signal processing module of the warp let-off is handled transmitance T ' a and T ' b and the ratio thereof that obtains described two optical elements, through described signal processing module the transmitance T ' a that has the quasi-linear modulations factor is done least square fitting or High frequency filter processing, draw A and B constant, then, make T ' a, T ' b, T ' a/T ' b and arctan function value Φ ' thereof (λ) with standard wave length's lookup table, deposit in the memory of described signal processing module, and optical fiber tie point Q point is recovered to connect;
The arctan function value Φ ' of described transmitance T ' a, constant A and B, transmitance T ' b, wavelength X value and two signal ratios (λ) mathematical relationship each other of value is:
T′a∝(A*λ+B)*sinΦ′(λ)
T′b∝cosΦ′(λ)
∝ is approximate direct ratio symbol in the above-mentioned formula, and ≈ is for being approximately equal to symbol, and A* λ+B is the quasi-linear modulations factor, T ' a=D ' a/D ' c, and T ' b=D ' b/D ' c, wherein D ' a, D ' b, D ' c are described three optical signal powers that detector detects respectively;
(2) step of survey sensing amount: via the demodulating system after the above-mentioned calibration, optical signal power D ' a that described three detectors are received from described optical fiber grating sensing head, D ' b and D ' c, the described signal processing module of the warp let-off is handled transmitance T ' a and T ' b and the ratio thereof that obtains described two optical elements, by the lookup table in the memory of this signal processing module, obtain and T ' a and T ' b and ratio immediate adjacent two or more phase values and wavelength value, give linearity or non-linear interpolation again and obtain the wavelength value of surveying, be converted into corresponding tested sensing amount then.
Effect of the present invention: ultra high speed optical fiber grating sensor demodulation method of the present invention has superelevation demodulation speed, demodulation wide ranges, resolution height and the low effect of cost.Its demodulation speed only is subject to detector speed and signal processing module speed, and the former can reach the 40GHz detector speed, and the latter can reach more than the 1MHz.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 is a type solution adjusting system figure of the present invention (in the frame of broken lines);
Fig. 2 is the type solution adjusting system figure (in the frame of broken lines) of an expansion of the present invention;
Solid line is represented the standard sine curve that the fiber grating transmitance is relevant with wavelength among Fig. 3-a, and dotted line is the sine curve that error is arranged;
Solid line is represented the standard cosine curve that the fiber grating transmitance is relevant with wavelength among Fig. 3-b, and dotted line is the cosine curve that error is arranged;
The actual situation line is represented the phase place that have error and the standard phase place of amplitude at [π ,+π] respectively among Fig. 3-c;
Solid line represents that dotted line is the sine curve that has modulation that error is arranged to the fiber grating transmitance sine curve that has modulation relevant with wavelength after the introducing quasi-linear modulations factor in the transmittance function of fiber grating element among Fig. 4-a;
Solid line is the transmittance function standard cosine curve relevant with wavelength of fiber grating element among Fig. 4-b, and dotted line is the cosine curve that error is arranged;
Be that actual situation line after introducing the quasi-linear modulations factor in the transmittance function of fiber grating element is respectively the phase place that have error and the standard phase place of amplitude at [π ,+π] among Fig. 4-c.
(5) embodiment
Referring to Fig. 1, in Fig. 1 frame of broken lines the enforcement illustration of a type solution adjusting system of the present invention.
Wherein, light source 1 can be continuous or pulse, first coupler 2 2*1 coupler, also available 2*2 coupler or circulator, this example 2*1 coupler.Second coupler 3 1*3 coupler, also available two 2*2 couplers serial connection forms this example 1*3 coupler.Tie point between first coupler 2 and second coupler 3 is the Q point.
Fiber grating 4 and 5 is designed to transmitance the sine curve that error arranged relevant with wavelength respectively and the cosine curve of error is arranged,
In Fig. 3-a, Ta is the transmitance of fiber grating 4, and λ is a wavelength, and solid line is the standard sine curve, and dotted line is the sine curve that error is arranged; Among Fig. 3-b, Tb is the transmitance of fiber grating 5, and λ is a wavelength, and solid line is the standard cosine curve, and dotted line is the cosine curve that error is arranged.Among Fig. 3-c, the arctan function value of the ratio of Φ (λ) expression transmitance Ta and transmitance Tb gained, λ is a wavelength, the actual situation line is represented the phase place that have error and the standard phase place of Φ (λ) value at [π ,+π] respectively.Standard sine curve among each figure shown in the solid line, standard cosine curve and standard phase place triangle broken line only provide comparative descriptions at this.
Wherein, the formula for dotted line is expressed as follows:
Ta∝sinΦ(λ)
Tb∝cosΦ(λ)，
∝ is approximate direct ratio symbol in the above-mentioned formula, and ≈ is for being approximately equal to symbol.
Demarcation by Φ (λ)----λ corresponding relation after recording Ta and Tb, can obtain the wavelength X of surveying.Here,
Ta=Da/Dc, Tb=Db/Dc, wherein Da is the optical signal power that detector 6 detects,
Db is the optical signal power that detector 7 detects, and Dc is the optical signal power that detector 8 detects.
Transmitance and wavelength relationship are the optical element that the error SIN function is arranged and the error cosine function is arranged, and are optical fiber or planar waveguide-type grating, and are the long period type or that warble type or oblique grating types; Or the overcoupling fused tapered coupler, or alternative by film-type filter with same light transmission rate, or same type of multistage or dissimilar above devices is compound.
Concrete demodulation method is as follows:
1, the step of system calibration: at first the light source with known wavelength substitutes the demodulating system light source, inject demodulating system by Q point among Fig. 1, with detector 6,7 and 8 optical signal powers that receive, obtain through signal processing module 9 processing: transmitance Ta and Tb and ratio thereof, and draw this ratio and phase place Φ (λ) and standard wave length's lookup table, deposit in the memory of signal processing module 9, then the Q point is connected.
2, survey the step of sensing amount: via the demodulating system after the above-mentioned calibration, the optical signal power that detector 6,7 and 8 is received from sensing head 11, obtain through signal processing module 9: Ta and Tb and ratio thereof, obtain and this ratio immediate adjacent two or more phase values and wavelength value by the lookup table in the memory of signal processing module 9, give linearity or non-linear interpolation again and obtain the wavelength value of surveying, be converted into corresponding tested sensing amount then.
Obviously, above-mentioned demodulation method is only applicable to a quasi-periodic situation, under a plurality of cycle situations, then will produce phase ambiguity.For eliminating this problem, improve wavelength measurement scope and resolution, further to introducing the quasi-linear modulations factor in the transmittance function of at least one element in fiber grating 4 and 5, shown in Fig. 4 a-c.The quasi-linear modulations factor realizes in can and making in described circuit elements design, also can be realized by independent almost element.Described almost linear element is optical fiber or planar waveguide-type grating, and is the long period type or that warble type or oblique grating type; Or the overcoupling fused tapered coupler, or alternative by film-type filter with same light transmission rate, or same type of multistage or dissimilar above devices is compound
Among Fig. 4-a, T ' a is the transmitance of fiber grating 4, and λ is a wavelength, and solid line is for introducing the sine curve of the quasi-linear modulations factor, and dotted line is for introducing the sine curve that error is arranged of the quasi-linear modulations factor; Among Fig. 4-b, T ' b is the transmitance of fiber grating 5, and λ is a wavelength, and solid line is the standard cosine curve, and dotted line is the cosine curve that error is arranged.Among Fig. 4-c, Φ ' (λ) represents the arctan function value of the ratio of transmitance T ' a and transmitance T ' b gained, and λ is a wavelength, the actual situation line represent respectively Φ ' (λ) value in the phase place that has error and the standard phase place of [π ,+π].Standard sine curve among each figure shown in the solid line, standard cosine curve and standard phase place triangle broken line only provide comparative descriptions at this.
Wherein, the formula for dotted line is expressed as follows:
T′a∝(A*λ+B)*sinΦ′(λ)
T′b?∝cosΦ′(λ)
∝ is approximate direct ratio symbol in the above-mentioned formula, and ≈ is for being approximately equal to symbol, and A* λ+B is the quasi-linear modulations factor.T ' a=D ' a/D ' c, T ' b=D ' b/D ' c, wherein D ' a is the optical signal power that detector 6 detects, and D ' b is the optical signal power that detector 7 detects, and D ' c is the optical signal power that detector 8 detects.
By to (λ) demarcation of----λ corresponding relation of A, B, T ' a, T ' b and Φ ', after recording T ' a and T ' b, by T ' a, T ' b and T ' a/T ' b ratio decision λ region, again by the Φ ' that demarcates (λ)----λ corresponding relation obtain the wavelength X of surveying.Shown in Fig. 4 a-c, X is identical (λ) with the pairing Φ ' of Y line, but T ' a/T ' b ratio is then different, distinguish thus Φ ' (λ) region and by Φ ' (λ)----λ corresponding relation obtain the wavelength X of surveying.
Concrete demodulation method is as follows:
1, the step of system calibration: at first the light source with known wavelength substitutes the demodulating system light source, inject demodulating system by Q point among Fig. 1, with detector 6,7 and 8 monitor luminous power, obtain through signal processing module 9 processing: T ' a and T ' b and ratio thereof, and transmitance T ' a is made least square fitting or High frequency filter handle, draw A and B constant.Then, make T ' a, T ' b and ratio thereof and calculating phase place Φ ' (λ) with standard wave length's lookup table, deposit in the memory of signal processing module 9, and the Q point connected.
2, survey the step of sensing amount: via the demodulating system after the above-mentioned calibration, the optical signal power that detector 6,7 and 8 is received from sensing head 11, obtain through signal processing module 9: T ' a and T ' b and ratio thereof, obtain and T ' a and T ' b and ratio immediate adjacent two or more phase values and wavelength value by the lookup table in the memory of signal processing module 9, give linearity or non-linear interpolation again and obtain the wavelength value of surveying, be converted into corresponding tested sensing amount then.
Among Fig. 1, fiber grating 4 and 5 is waveguide grating also, and can be the long period type or that warble type or oblique grating type, also overcoupling fused tapered coupler, also can substitute, also same type of multistage or dissimilar above devices compound by film-type filter with same light transmission rate.
Among Fig. 1, above-mentioned quasi-linear modulations factor function realizes in can and making in described circuit elements design, also can realize by independent almost element, can be that almost linear element is realized also by other introducing transmitance and wavelength relationship, as fiber grating or waveguide grating, and can be the long period type or that warble type or oblique grating type, also overcoupling fused tapered coupler, also can substitute, also same type of multistage or dissimilar above devices compound by film-type filter with same light transmission rate.
Among Fig. 1, above-mentioned quasi-linear modulations factor function also can further be substituted by other forms of modulation factor.
Insert tunable optic filter by the Q point in Fig. 1, then system can be used for the measurement of a plurality of long wavelength fiber grating sensing heads.
In Fig. 2, second coupled apparatus 3 be designed to 3-1,3-2 ... the logical type coupler of 3-n band, optical element 4 and optical element 5 be designed to respectively 4-1,4-2 ... 4-n and 5-1,5-2 ... 5-n, and detector 6,7 and 8 be designed to respectively 6-1,6-2 ... 6-n, 7-1,7-2 ... 7-n, with 8-1,8-2 ... 8-n then can be used for the measurement of a plurality of long wavelength fiber grating sensing heads.
Demodulating system of the present invention and demodulation method are suitable for other equally and require to measure the transducer of wavelength or the occasion of laser or communication system.
Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (3)
1, a kind of ultra high speed optical fiber grating sensor demodulation method, the demodulating system that described demodulation method uses comprises: a light source; Two couplers, first coupler and second coupler, the tie point between two couplers are the Q point; Transmitance and wavelength relationship are the optical element that the SIN function of error is arranged; Transmitance and wavelength relationship are the optical element that the cosine function of error is arranged; Three detectors; A signal processing module; A display module; Described light source passes through described first coupler with light wave, reach described optical fiber grating sensing head, described grating sensing head is after measured effect, the reflecting light long hair is given birth to and is moved, again through described first and second couplers, be that the optical element of SIN function of error and transmitance and wavelength relationship are arranged is optical element and the output of optical power monitoring end that the cosine function of error is arranged by described transmitance and wavelength relationship respectively, survey after described signal processing module is handled the tested value of back output institute's wavelength amount of movement of surveying and its correspondence to this display module by described detector, it is characterized in that described demodulation method comprises:
(1) step of system calibration: at first the light signal of known wavelength is substituted described light source and optical fiber grating sensing head from demodulating system described first coupler and the described demodulating system of optical fiber tie point Q point injection between second coupler, with closing by transmitance and wavelength X respectively of receiving of described three detectors is the optical element of SIN function of wrong difference and transmitance and the wavelength X pass is the optical element of cosine function of wrong difference and the luminous power Da of monitoring side, Db and Dc, the described signal processing module of the warp let-off is handled transmitance Ta and Tb and the ratio thereof that obtains described two optical elements, and then draw Ta/Tb and arctan function value Φ (λ) thereof and standard wave length's lookup table, and deposit in the memory of described signal processing module, and described optical fiber tie point Q point is recovered to connect;
The mathematical relationship each other of arctan function value Φ (λ) value of described transmitance Ta, transmitance Tb, wavelength X value and two signal ratios is:
Ta∝sinΦ(λ)
Tb∝cosΦ(λ)，
∝ is approximate direct ratio symbol in the above-mentioned formula, and ≈ is for being approximately equal to symbol, Ta=Da/Dc, and Tb=Db/Dc, wherein Da, Db, Dc are described three optical signal powers that detector detects respectively; (2) step of survey sensing amount: via the demodulating system after the above-mentioned calibration, the luminous power Da from described optical fiber grating sensing head, Db and Dc that described three detectors are received, obtain described transmitance Ta and Tb and ratio thereof through described signal processing module, by the lookup table in the memory of this signal processing module, obtain and this ratio immediate adjacent two or more phase values and wavelength value, give linearity or non-linear interpolation again and obtain the wavelength value of surveying, be converted into corresponding tested sensing amount then.
2, a kind of ultra high speed optical fiber grating sensor demodulation method, the demodulating system that described demodulation method uses comprises: a light source; Two couplers, first coupler and second coupler, the tie point between two couplers are the Q point; Transmitance and wavelength relationship are the optical element that the SIN function of error is arranged; Transmitance and wavelength relationship are the optical element that the cosine function of error is arranged; Three detectors; A signal processing module; A display module; Described light source passes through described first coupler with light wave, reach described optical fiber grating sensing head, described grating sensing head is after measured effect, the reflecting light long hair is given birth to and is moved, again through described first and second couplers, be that the optical element of SIN function of error and transmitance and wavelength relationship are arranged is optical element and the output of optical power monitoring end that the cosine function of error is arranged by described transmitance and wavelength relationship respectively, survey after described signal processing module is handled the tested value of back output institute's wavelength amount of movement of surveying and its correspondence to this display module by described detector, it is characterized in that described demodulation method comprises:
(1) step of system calibration: at first the light signal of known wavelength is substituted described light source and optical fiber grating sensing head from demodulating system described first coupler and the described demodulating system of optical fiber tie point Q point injection between second coupler, with closing by transmitance and wavelength X respectively of receiving of described three detectors is the optical element of SIN function of wrong difference and transmitance and the wavelength X pass is the optical element of cosine function of wrong difference and the luminous power D ' a of monitoring side, D ' b and D ' c, the described signal processing module of the warp let-off is handled transmitance T ' a and T ' b and the ratio thereof that obtains described two optical elements, through described signal processing module the transmitance T ' a that has the quasi-linear modulations factor is done least square fitting or High frequency filter processing, draw A and B constant, then, make T ' a, T ' b, T ' a/T ' b and arctan function value Φ ' thereof (λ) with standard wave length's lookup table, deposit in the memory of described signal processing module, and described optical fiber tie point Q point is recovered to connect;
The arctan function value Φ ' of described transmitance T ' a, constant A and B, transmitance T ' b, wavelength X value and two signal ratios (λ) mathematical relationship each other of value is:
T′a∝(A*λ+B)*sinΦ′(λ)
T′b∝cosΦ′(λ)
∝ is approximate direct ratio symbol in the above-mentioned formula, and ≈ is for being approximately equal to symbol, and A* λ+B is the quasi-linear modulations factor, T ' a=D ' a/D ' c, and T ' b=D ' b/D ' c, wherein D ' a, D ' b, D ' c are described three optical signal powers that detector detects respectively;
(2) step of survey sensing amount: via the demodulating system after the above-mentioned calibration, optical signal power D ' a that described three detectors are received from described optical fiber grating sensing head, D ' b and D ' c, the described signal processing module of the warp let-off is handled transmitance T ' a and T ' b and the ratio thereof that obtains described two optical elements, by the lookup table in the memory of this signal processing module, obtain and T ' a and T ' b and ratio immediate adjacent two or more phase values and wavelength value, give linearity or non-linear interpolation again and obtain the wavelength value of surveying, be converted into corresponding tested sensing amount then.
3, ultra high speed optical fiber grating sensor demodulation method as claimed in claim 2 is characterized in that its described quasi-linear modulations factors A * λ+B can be substituted by other forms of modulation factor.
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| CN1324304C (en) * | 2005-05-23 | 2007-07-04 | 湖南科技大学 | Multifunctional optical fiber optical grating sensing experiment instrument |
| CN101975589A (en) * | 2010-08-24 | 2011-02-16 | 刘炜 | Calibration system based on distributed fiber double compensation gratings and calibration method thereof |
| CN102147552A (en) * | 2011-03-11 | 2011-08-10 | 大连理工大学 | Unbalanced interferometer based fiber bragg grating (FBG) demodulation system and method |
| CN102193267B (en) * | 2011-05-09 | 2013-09-04 | 上海紫珊光电技术有限公司 | Demodulation system for carrying out wavelength side-band processing on fiber gratings |
| CN103217182B (en) * | 2013-03-27 | 2015-05-20 | 黑龙江大学 | Multi-channel fiber grating demodulating device based on color filters |
| CN108414073B (en) * | 2018-01-10 | 2019-07-09 | 华中科技大学 | A kind of fibre-optical acoustic sensor phase demodulating method based on spectrum encoded acoustic |
| CN109391322B (en) * | 2018-12-14 | 2023-09-05 | 珠海任驰光电科技有限公司 | Device and method for measuring length of medium-short optical fiber jumper |
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| US5319435A (en) * | 1991-09-04 | 1994-06-07 | Melle Serge M | Method and apparatus for measuring the wavelength of spectrally narrow optical signals |
| US5729347A (en) * | 1996-11-08 | 1998-03-17 | So; Vincent | Optical wavelength measurement system |
| WO2001016569A1 (en) * | 1999-09-01 | 2001-03-08 | Bookham Technology Plc | Optical wavelength measuring devices |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5319435A (en) * | 1991-09-04 | 1994-06-07 | Melle Serge M | Method and apparatus for measuring the wavelength of spectrally narrow optical signals |
| US5729347A (en) * | 1996-11-08 | 1998-03-17 | So; Vincent | Optical wavelength measurement system |
| WO2001016569A1 (en) * | 1999-09-01 | 2001-03-08 | Bookham Technology Plc | Optical wavelength measuring devices |
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