CN109506686B - Method for improving detection performance of isotactic fiber bragg grating - Google Patents

Method for improving detection performance of isotactic fiber bragg grating Download PDF

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CN109506686B
CN109506686B CN201811554984.2A CN201811554984A CN109506686B CN 109506686 B CN109506686 B CN 109506686B CN 201811554984 A CN201811554984 A CN 201811554984A CN 109506686 B CN109506686 B CN 109506686B
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钱磊
罗显庭
张轶虎
于本化
胡铁
靖静
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Wuhan Ligong Guangke Co Ltd
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    • 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

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Abstract

The invention discloses a method for improving the detection performance of an identical fiber grating, which comprises the following steps: s1, 8 groups of digital sequences are generated by the encoder, the digital sequences are respectively set to be 1 or 0, and the corresponding encoding relation is met; s2, modulating the light source by 8 groups of digital sequences generated by the encoder respectively to generate corresponding coded pulse light; s3, respectively injecting coded pulse light into the identical fiber bragg grating sensing optical cables; s4, sampling the reflection signals of the identical fiber bragg grating in a specific period; s5, dividing the sampling signal modulated by the light source and the digital sequence into two parts, respectively carrying out demodulation operation, and demodulating to obtain a reflection signal of the identical fiber bragg grating corresponding to the coded pulse width; the spatial resolution and the distance of the obtained reflection signal are both higher than those of the reflection signal of the identical fiber bragg grating corresponding to the single pulse width. The invention improves the detection performance of the identical fiber bragg grating and realizes the detection of the identical fiber bragg grating with high spatial resolution and long distance.

Description

Method for improving detection performance of isotactic fiber bragg grating
Technical Field
The invention relates to the field of isotactic fiber grating sensing, in particular to a method for improving detection performance of isotactic fiber grating.
Background
The identical fiber bragg grating has the same wave band, is not limited by the bandwidth of a light source, and is widely applied to a large-capacity fiber bragg grating sensing network. At present, the detection of the identical fiber bragg grating generally adopts the time difference of the identical fiber bragg grating sensors to the reflection signals of the light source single pulse light to distinguish the sensors, the wider the width of the light source single pulse light is, the more serious the aliasing of the reflection signals of the sensors is, and the spatial resolution of the identical fiber bragg grating detection is reduced. The narrower the width of the single pulse light of the light source, the weaker the reflected signal of the sensor, and the detection distance of the identical fiber bragg grating is reduced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method improves the spatial resolution and distance of the identical fiber bragg grating by coding the light source pulse light and changing the pulse width, solves the contradiction in the spatial resolution and distance of the identical fiber bragg grating detection caused by the light source pulse light width in the traditional single-pulse light identical fiber bragg grating detection, and provides the method for improving the detection performance of the identical fiber bragg grating.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a method for improving the detection performance of an identical fiber grating, which comprises the following steps:
s1, 8 groups of digital sequences are generated by the encoder, the digital sequences are respectively set to be 1 or 0, and the corresponding encoding relation is met;
s2, modulating the light source by 8 groups of digital sequences generated by the encoder respectively to generate corresponding coded pulse light;
s3, respectively injecting coded pulse light modulated by a light source into the identical fiber bragg grating sensing optical cables;
s4, sampling the reflection signal of the homonymous fiber bragg grating modulated by the light source in a specific period;
s5, dividing the sampling signal modulated by the light source and the digital sequence into two parts, respectively carrying out demodulation operation, and demodulating to obtain a reflection signal of the identical fiber bragg grating corresponding to the coded pulse width; the spatial resolution and the distance of the obtained reflection signal are both higher than those of the reflection signal of the identical fiber bragg grating corresponding to the single pulse width.
Further, the encoding method in step S1 of the present invention specifically includes:
the generation of 8 sets of digital sequences by the encoder is: a. thek、Bk、Ck、Dk、Ek、Fk、Gk、HkK is more than or equal to 0 and less than L, wherein L is the number of coded bits, Ak、Bk、Ck、Dk、Ek、Fk、Gk、HkEqual to 1 or 0, so that the 8 groups of digital sequences satisfy the following relationship:
(Ak-Bk)*(Ak-Bk)+(Ck-Dk)*(Ck-Dk)＝2Lδk
(Ek-Fk)*(Ek-Fk)+(Gk-Hk)*(Gk-Hk)＝2Lδk
Figure BDA0001911625050000021
wherein is the correlation operation.
Further, the method for modulating the light source in step S2 of the present invention specifically includes:
8 groups of digital sequences A generated by an encoderk、Bk、Ck、Dk、Ek、Fk、Gk、HkThe light sources are respectively modulated, and the generated coded pulse light is xa、xb、xc、xd、xe、xf、xg、xh；
Coded pulse light xa、xb、xc、xdCoded pulse width of T1Coded pulse light xe、xf、xg、xhCoded pulse width of T2；T2Greater than T1And T is2–T1＝T0，T2And T1Is T0Integer multiple of (a), T1＝mT0Wherein m is an integer and m is greater than or equal to 1.
Further, the method for injecting the encoding pulse in step S3 of the present invention specifically includes:
coded pulse light x output by modulating light sourcea、xb、xc、xd、xe、xf、xg、xhRespectively injected into the same fiber grating sensing lightIn the cable.
Further, the method for sampling the signal in step S4 of the present invention specifically includes:
by T0The reflection signals of the identical fiber bragg gratings after being modulated by the light source are periodically sampled to be y respectivelya、yb、yc、yd、ye、yf、yg、yh(ii) a The expressions are respectively:
Figure BDA0001911625050000022
Figure BDA0001911625050000031
Figure BDA0001911625050000032
Figure BDA0001911625050000033
Figure BDA0001911625050000034
Figure BDA0001911625050000035
Figure BDA0001911625050000036
Figure BDA0001911625050000037
wherein y is1Indicating the light width T of a single pulse1Corresponding identical fiber grating reflectionA signal; y is2Indicating the light width T of a single pulse2Corresponding identical fiber bragg grating reflected signals; due to T2Greater than T1And T is2–T1＝T0，T2And T1Is T0Integer multiple of (a), T1＝mT0Where m is an integer and m is greater than or equal to 1, y1And y2The following relationship is satisfied:
Figure BDA0001911625050000038
Figure BDA0001911625050000039
wherein y is0Indicating the light width T of a single pulse0The corresponding identical fiber grating reflects signals.
Further, the method for demodulating the signal in step S5 of the present invention specifically includes:
sampling signal y modulated by light sourcea、yb、yc、ydAnd the number sequence Ak、Bk、Ck、DkPerforming a correlation operation, i.e. (y)a-yb)*(Ak-Bk)+(yc-yd)*(Ck-Dk) Demodulating the coded pulse width T1The reflection signal of the corresponding homonymous fiber grating is 2Ly1(n)；
Sampling signal y modulated by light sourcee、yf、yg、yhAnd the number sequence Ek、Fk、Gk、HkPerforming a correlation operation, i.e. (y)e–yf)*(Ek-Fk)+(yg-yh)*(Gk-Hk) Demodulating the coded pulse width T2The reflection signal of the corresponding homonymous fiber grating is 2Ly2(n)；
According to 2Ly2(n)-2Ly1(n)＝2L y0(n-m), so that the code pulse is demodulatedPunch width T0The reflection signal of the corresponding homonymous fiber grating is 2Ly0Compare to single pulse width T0Corresponding reflection signal y of identical fiber grating0Amplified by a factor of 2L.
The invention has the following beneficial effects: the method for improving the detection performance of the identical fiber bragg grating is used for carrying out code modulation on a light source based on the contradiction between the spatial resolution and the distance of the identical fiber bragg grating detection caused by the light source pulse width in the traditional single-pulse light identical fiber bragg grating detection to generate pulse light with different codes and different widths, and the detection performance of the identical fiber bragg grating is improved by demodulating the reflection signal of the identical fiber bragg grating, so that the high spatial resolution and the long-distance detection of the identical fiber bragg grating are realized.
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The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a method for improving the detection performance of an identical fiber grating according to the present invention.
Fig. 2 is a schematic diagram of coded pulsed light modulated by a light source of the present invention.
FIG. 3 is a schematic view of an identical fiber grating cable with coded pulse light injection according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a method for improving the detection performance of an identical fiber grating, which solves the contradiction between the spatial resolution and the distance of the identical fiber grating detection caused by the light source pulse width in the single-pulse light identical fiber grating detection, realizes the detection of the identical fiber grating with high spatial resolution and long distance, and comprises the following steps (as shown in figure 1):
1. code generation, 8 groups of digital sequences A are generated by the encoderk、Bk、Ck、Dk、Ek、Fk、Gk、Hk(0. ltoreq. k < L, where L16 is the number of coded bits), Ak、Bk、Ck、Dk、Ek、Fk、Gk、HkEqual to 1 or 0.
Ak＝{1,1,1,0,1,1,0,1,1,1,1,0,0,0,1,0}
Bk＝{0,0,0,1,0,0,1,0,0,0,0,1,1,1,0,1}
Ck＝{1,1,1,0,1,1,0,1,0,0,0,1,1,1,0,1}
Dk＝{0,0,0,1,0,0,1,0,1,1,1,0,0,0,1,0}
Ek＝{1,1,1,0,1,1,0,1,1,1,1,0,0,0,1,0}
Fk＝{0,0,0,1,0,0,1,0,0,0,0,1,1,1,0,1}
Gk＝{1,1,1,0,1,1,0,1,0,0,0,1,1,1,0,1}
Hk＝{0,0,0,1,0,0,1,0,1,1,1,0,0,0,1,0}
The 8 groups of digital sequences satisfy the following relationship:
(Ak-Bk)*(Ak-Bk)+(Ck-Dk)*(Ck-Dk)＝2Lδk
(Ek-Fk)*(Ek-Fk)+(Gk-Hk)*(Gk-Hk)＝2Lδk
Figure BDA0001911625050000051
wherein is the correlation operation.
2. Light source modulation, 8 sets of digital sequences A generated by an encoderk、Bk、Ck、Dk、Ek、Fk、Gk、HkThe light sources are respectively modulated, and the generated coded pulse light is xa、xb、xc、xd、xe、xf、xg、xh. As shown in fig. 2, pulsed light x is encodeda、xb、xc、xdCoded pulse width of T110ns, coded pulse light xe、xf、xg、xhCoded pulse width of T2＝11ns。T2Greater than T1And T is2–T1＝T0＝1ns，T2And T1Is T0Integer multiple of (T)1＝mT0，m＝10)。
3. Coded pulse light x is injected, and a light source is modulated and outputa、xb、xc、xd、xe、xf、xg、xhRespectively injected into the identical fiber bragg grating sensing optical cables. As shown in FIG. 3, every two FBG sensors of the identical FBG sensing cable are spaced by 0.1 m.
4. Signal acquisition by T0The reflection signals of the identical fiber bragg gratings which are periodically sampled and modulated by the light source are y respectively in 1nsa、yb、yc、yd、ye、yf、yg、yh。
Figure BDA0001911625050000061
Figure BDA0001911625050000062
Figure BDA0001911625050000063
Figure BDA0001911625050000064
Figure BDA0001911625050000065
Figure BDA0001911625050000066
Figure BDA0001911625050000067
Figure BDA0001911625050000068
Wherein y is1Indicating the light width T of a single pulse110ns corresponding identical fiber grating reflected signal, y1(n) represents a single pulse light width T1The nth acquisition data corresponding to 10ns (the sampling period is T)0＝1ns)；y2Indicating the light width T of a single pulse2Identical fiber grating reflected signal, y, corresponding to 11ns2(n) Single pulse light Width T2The nth acquisition data corresponding to 11ns (the sampling period is T)01 ns). Due to T2Greater than T1And T is2–T1＝T0＝1ns，T2And T1Is T0Integer multiple of (T)1＝mT0＝10T0)，y1And y2The following relationship is satisfied:
Figure BDA0001911625050000071
Figure BDA0001911625050000072
wherein y is0Indicating the light width T of a single pulse01ns corresponding identical fiber grating reflected signal, y0(n) represents a single pulse light width T0The nth collected data corresponding to 1ns (the sampling period is T)01 ns). As shown in FIG. 3, the interval between every two identical fiber grating sensors is 0.1m, and every two identical fibersThe time interval from the sampling of the reflected light of the grating sensor is 0.1m/VSpeed of lightX 2-1 ns (speed of light propagation in optical cable V)Speed of light＝2×108m/s). If the traditional single-pulse light injection identical fiber grating optical cable is used, the single-pulse light width T0The sampling signal corresponding to 1ns is the reflection signal of 1 identical fiber grating sensor; single pulse light width T1The sampling signal corresponding to 10ns is the aliasing of the reflected signals of 10 identical fiber grating sensors; single pulse light width T2The sampling signal corresponding to 11ns is the aliasing of the reflected signals of 11 identical fiber grating sensors. When the single pulse light width is T110ns and T2When the time is 11ns, the spatial resolution is only 1m and 1.1m due to the aliasing phenomenon of the reflected signals of the identical fiber bragg grating sensor; when single pulse light width T0Although the spatial resolution is 0.1m in 1ns, the light width is T compared with that of a single pulse because only the reflected signals of 1 identical fiber grating sensor110ns and T2At 11ns, the strength of the reflected signal is much weaker and the distance detected is shorter.
5. Signal demodulation, sampling signal y modulated by light sourcea、yb、yc、ydAnd the number sequence Ak、Bk、Ck、DkPerforming a correlation operation, i.e. (y)a-yb)*(Ak-Bk)+(yc-yd)*(Ck-Dk) Can demodulate the coded pulse width T1The reflection signal of 10ns corresponding identical fiber grating is 2Ly1(n)＝32y1(n); sampling signal y modulated by light sourcee、yf、yg、yhAnd the number sequence Ek、Fk、Gk、HkPerforming a correlation operation, i.e. (y)e–yf)*(Ek-Fk)+(yg-yh)*(Gk-Hk) Can demodulate the coded pulse width T2The reflection signal of the identical fiber grating corresponding to 11ns is 2Ly2(n)＝32y2(n) of (a). Since 2Ly2(n)-2Ly1(n)＝2L y0(n-m)＝32y0(n-10), so that the coded pulse width T is demodulated0The reflection signal of the identical fiber grating corresponding to 1ns is 2Ly0＝32y0Compare to single pulse width T01ns corresponding reflection signal y of identical fiber grating0The magnification was 2L-32 times. By encoding the light source pulse light and changing the pulse width, the traditional single pulse width T is changed110ns and T2The 1m and 1.1m low spatial resolution corresponding to 11ns is increased to the conventional single pulse width T0High spatial resolution of 0.1m for 1ns (spatial resolution VSpeed of lightX single pulse width/2, where the speed of light propagation in the cable is VSpeed of light＝2×108m/s) and has a pulse width T greater than the conventional single pulse width T0The intensity of the reflected signal corresponding to 1ns is increased by 2L-32 times, and the detection distance of the identical fiber grating is prolonged.
Figure BDA0001911625050000081
Figure BDA0001911625050000082
Figure BDA0001911625050000083
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims (5)

1. A method for improving the detection performance of an identical fiber grating is characterized by comprising the following steps:
s1, 8 groups of digital sequences are generated by the encoder, the digital sequences are respectively set to be 1 or 0, and the corresponding encoding relation is met;
s2, modulating the light source by 8 groups of digital sequences generated by the encoder respectively to generate corresponding coded pulse light;
s3, respectively injecting coded pulse light modulated by a light source into the identical fiber bragg grating sensing optical cables;
s4, sampling the reflection signal of the homonymous fiber bragg grating modulated by the light source in a specific period;
s5, dividing the sampling signal modulated by the light source and the digital sequence into two parts, respectively carrying out demodulation operation, and demodulating to obtain a reflection signal of the identical fiber bragg grating corresponding to the coded pulse width; the spatial resolution and the distance of the obtained reflection signal are both higher than those of the reflection signal of the identical fiber bragg grating corresponding to the single pulse width;
the encoding method in step S1 specifically includes:
the generation of 8 sets of digital sequences by the encoder is: a. thek、Bk、Ck、Dk、Ek、Fk、Gk、HkK is more than or equal to 0 and less than L, wherein L is the number of coded bits, Ak、Bk、Ck、Dk、Ek、Fk、Gk、HkEqual to 1 or 0, so that the 8 groups of digital sequences satisfy the following relationship:
(Ak-Bk)*(Ak-Bk)+(Ck-Dk)*(Ck-Dk)＝2Lδk
(Ek-Fk)*(Ek-Fk)+(Gk-Hk)*(Gk-Hk)＝2Lδk
Figure FDA0002818709590000011
wherein is the correlation operation.
2. The method for improving the performance of the isotactic fiber grating detection according to claim 1, wherein the method for modulating the light source in step S2 specifically comprises:
8 groups of digital sequences A generated by an encoderk、Bk、Ck、Dk、Ek、Fk、Gk、HkThe light sources are respectively modulated, and the generated coded pulse light is xa、xb、xc、xd、xe、xf、xg、xh；
Coded pulse light xa、xb、xc、xdCoded pulse width of T1Coded pulse light xe、xf、xg、xhCoded pulse width of T2；T2Greater than T1And T is2–T1＝T0，T2And T1Is T0Integer multiple of (a), T1＝mT0Wherein m is an integer and m is greater than or equal to 1.
3. The method for improving the performance of the isotactic fiber grating detection as recited in claim 2, wherein the method for injecting the coded pulse in step S3 specifically comprises:
coded pulse light x output by modulating light sourcea、xb、xc、xd、xe、xf、xg、xhRespectively injected into the identical fiber bragg grating sensing optical cables.
4. The method for improving the performance of the isotactic fiber grating detection as recited in claim 2, wherein the method for sampling the signal in step S4 specifically comprises:
by T0The reflection signals of the identical fiber bragg gratings after being modulated by the light source are periodically sampled to be y respectivelya、yb、yc、yd、ye、yf、yg、yh(ii) a The expressions are respectively:
Figure FDA0002818709590000021
Figure FDA0002818709590000022
Figure FDA0002818709590000023
Figure FDA0002818709590000024
Figure FDA0002818709590000025
Figure FDA0002818709590000026
Figure FDA0002818709590000027
Figure FDA0002818709590000031
wherein y is1Indicating the light width T of a single pulse1Corresponding identical fiber bragg grating reflected signals; y is2Indicating the light width T of a single pulse2Corresponding identical fiber bragg grating reflected signals; due to T2Greater than T1And T is2–T1＝T0，T2And T1Is T0Integer multiple of (a), T1＝mT0Where m is an integer and m is greater than or equal to 1, y1And y2The following relationship is satisfied:
Figure FDA0002818709590000032
Figure FDA0002818709590000033
wherein y is0Indicating the light width T of a single pulse0The corresponding identical fiber grating reflects signals.
5. The method for improving the performance of the isotactic fiber grating detection as recited in claim 4, wherein the signal demodulation in step S5 is specifically performed by:
sampling signal y modulated by light sourcea、yb、yc、ydAnd the number sequence Ak、Bk、Ck、DkPerforming a correlation operation, i.e. (y)a-yb)*(Ak-Bk)+(yc-yd)*(Ck-Dk) Demodulating the coded pulse width T1The reflection signal of the corresponding homonymous fiber grating is 2Ly1(n)；
Sampling signal y modulated by light sourcee、yf、yg、yhAnd the number sequence Ek、Fk、Gk、HkPerforming a correlation operation, i.e. (y)e–yf)*(Ek-Fk)+(yg-yh)*(Gk-Hk) Demodulating the coded pulse width T2The reflection signal of the corresponding homonymous fiber grating is 2Ly2(n)；
According to 2Ly2(n)-2Ly1(n)＝2L y0(n-m) so that the coded pulse width T is demodulated0The reflection signal of the corresponding homonymous fiber grating is 2Ly0Compare to single pulse width T0Corresponding reflection signal y of identical fiber grating0Amplified by a factor of 2L.
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