CN109506686A - A method of it improves entirely with optical fiber Grating examinations performance - Google Patents
A method of it improves entirely with optical fiber Grating examinations performance Download PDFInfo
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- CN109506686A CN109506686A CN201811554984.2A CN201811554984A CN109506686A CN 109506686 A CN109506686 A CN 109506686A CN 201811554984 A CN201811554984 A CN 201811554984A CN 109506686 A CN109506686 A CN 109506686A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000835 fiber Substances 0.000 claims abstract description 41
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 238000010010 raising Methods 0.000 claims abstract description 11
- 238000005070 sampling Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
Abstract
The invention discloses a kind of raisings entirely with the method for optical fiber Grating examinations performance, method includes the following steps: S1, by encoder generating 8 groups of Serial No.s, Serial No. is respectively set to 1 or 0, and meets corresponding encoding relation；S2, light source is modulated respectively with 8 groups of Serial No.s that encoder generates, generates corresponding coded pulse light；S3, coded pulse light is injected separately into entirely in optical fiber grating sensing optical cable；S4, the reflection signal entirely with fiber grating is sampled with specific period；S5, by after modulation of source sampled signal and Serial No. be divided into two parts, carry out demodulation operation respectively, it is corresponding entirely with the reflection signal of fiber grating that demodulation obtains its coded pulse width；It is corresponding entirely with the reflection signal of fiber grating that the spatial resolution and distance of obtained reflection signal are above single pulse width.The present invention improves with optical fiber Grating examinations performance, realizes the detection with fiber grating high spatial resolution and long range entirely entirely.
Description
Technical field
The present invention relates to entirely with optical fiber grating sensing field more particularly to a kind of raising entirely with optical fiber Grating examinations performance
Method.
Background technique
It entirely with fiber grating due to wave band having the same, is not limited by light source bandwidth, is widely used in large capacity light
Fine grating sensing network.It generallys use with the detection of fiber grating and full light source simple venation is washed off with fiber-optic grating sensor entirely at present
The time difference of reflection signal distinguish each sensor, the width that light source simple venation is washed off is wider, and it is mixed that sensor reflects signal
It is folded more serious, it reduces entirely with the spatial resolution of optical fiber Grating examinations.The width that light source simple venation is washed off is narrower, sensor reflection
Signal is weaker, reduces entirely with the distance of optical fiber Grating examinations.
Summary of the invention
The technical problem to be solved in the present invention is that: the change by carrying out coding and pulse width to light source pulse light,
It improves entirely with the spatial resolution of fiber grating and distance, solves traditional single pulse light entirely with light source pulse in optical fiber Grating examinations
A kind of improve entirely with optical fiber light is provided with the spatial resolution of optical fiber Grating examinations and apart from upper contradiction entirely caused by optical width
The method of grid detection performance.
The technical solution adopted by the present invention to solve the technical problems is:
The present invention provide it is a kind of raising entirely with the method for optical fiber Grating examinations performance, method includes the following steps:
S1,8 groups of Serial No.s are generated by encoder, Serial No. is respectively set to 1 or 0, and meets corresponding coding and close
System；
S2, light source is modulated respectively with 8 groups of Serial No.s that encoder generates, generates corresponding coded pulse light；
S3, coded pulse light of the light source after modulated is injected separately into entirely in optical fiber grating sensing optical cable；
S4, it is sampled with reflection signal of the specific period to the complete same fiber grating after modulation of source；
S5, by after modulation of source sampled signal and Serial No. be divided into two parts, carry out demodulation operation respectively, demodulate
It is corresponding entirely with the reflection signal of fiber grating to obtain its coded pulse width；Obtain reflection signal spatial resolution and away from
It is corresponding entirely with the reflection signal of fiber grating from single pulse width is above.
Further, the method encoded in step S1 of the invention specifically:
Generate 8 groups of Serial No.s respectively by encoder are as follows: Ak、Bk、Ck、Dk、Ek、Fk、Gk、Hk, 0≤k < L, wherein L is to compile
The digit of code, Ak、Bk、Ck、Dk、Ek、Fk、Gk、HkEqual to 1 or 0,8 groups of Serial No.s is made to meet following relationship:
(Ak-Bk)*(Ak-Bk)+(Ck-Dk)*(Ck-Dk)=2L δk
(Ek-Fk)*(Ek-Fk)+(Gk-Hk)*(Gk-Hk)=2L δk
Wherein * is related operation.
Further, the method for modulation of source is carried out in step S2 of the invention specifically:
The 8 groups of Serial No. A generated with encoderk、Bk、Ck、Dk、Ek、Fk、Gk、HkLight source is modulated respectively, is generated
Coded pulse light be respectively xa、xb、xc、xd、xe、xf、xg、xh；
Coded pulse light xa、xb、xc、xdCoded pulse width be T1, coded pulse light xe、xf、xg、xhCoded pulse
Width is T2；T2Greater than T1, and T2–T1=T0, T2And T1It is T0Integral multiple, T1=mT0, wherein m is that integer and m are greater than etc.
In 1.
Further, the method for coded pulse injection is carried out in step S3 of the invention specifically:
By the coded pulse light x of the modulated output of light sourcea、xb、xc、xd、xe、xf、xg、xhIt is injected separately into entirely with optical fiber light
In grid sensing optic cable.
Further, the method for signal sampling is carried out in step S4 of the invention specifically:
With T0The reflection signal for the complete same fiber grating for being periodic sampling after modulation of source is respectively ya、yb、yc、yd、ye、
yf、yg、yh；Its expression formula is respectively as follows:
Wherein y1Indicate pulse optical width T1Corresponding complete same fiber Bragg grating reflected signal；y2Indicate pulse optical width
T2Corresponding complete same fiber Bragg grating reflected signal；Due to T2Greater than T1, and T2–T1=T0, T2And T1It is T0Integral multiple, T1=
mT0, wherein m is integer and m is more than or equal to 1, y1And y2Meet following relationship:
Wherein y0Indicate pulse optical width T0Corresponding complete same fiber Bragg grating reflected signal.
Further, the method for signal demodulation is carried out in step S5 of the invention specifically:
By the sampled signal y after modulation of sourcea、yb、yc、ydWith Serial No. Ak、Bk、Ck、DkCarrying out related operation is
(ya-yb)*(Ak-Bk)+(yc-yd)*(Ck-Dk), demodulate coded pulse width T1It is corresponding entirely with the reflection signal of fiber grating
For 2Ly1(n)；
By the sampled signal y after modulation of sourcee、yf、yg、yhWith Serial No. Ek、Fk、Gk、HkCarrying out related operation is
(ye–yf)*(Ek-Fk)+(yg-yh)*(Gk-Hk), demodulate coded pulse width T2It is corresponding entirely with the reflection signal of fiber grating
For 2Ly2(n)；
According to 2Ly2(n)-2Ly1(n)=2L y0(n-m), therefore coded pulse width T is demodulated0It is corresponding entirely with optical fiber light
The reflection signal of grid is 2Ly0, compare single pulse width T0It is corresponding entirely with the reflection signal y of fiber grating0It is exaggerated 2L times.
The beneficial effect comprise that: of the invention improves entirely with the method for optical fiber Grating examinations performance, based on biography
System simple venation wash off entirely with caused by light source pulse optical width in optical fiber Grating examinations entirely with the spatial resolution of optical fiber Grating examinations
With apart from upper contradiction, coded modulation is carried out to light source, generates the pulsed light of different coding and different in width, by sharing the same light entirely
Fine optical grating reflection signal is demodulated, and is improved entirely with optical fiber Grating examinations performance, is realized entirely with fiber grating high spatial resolution
With the detection of long range.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is a kind of raising provided by the invention entirely with the method flow diagram of optical fiber Grating examinations performance.
Fig. 2 is the coded pulse light schematic diagram of modulation of source of the invention.
Fig. 3 is the complete same fiber grating optical cable schematic diagram of coded pulse light injection of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
A kind of raising provided by the invention with the method for optical fiber Grating examinations performance, solves simple venation and washes off entirely with optical fiber light entirely
It is realized complete caused by light source pulse optical width entirely with the spatial resolution of optical fiber Grating examinations and apart from upper contradiction in grid detection
With the detection of fiber grating high spatial resolution and long range, include the following steps (as shown in Figure 1):
1, coding generates, and generates 8 groups of Serial No. A respectively by encoderk、Bk、Ck、Dk、Ek、Fk、Gk、Hk(0≤k < L,
Middle L=16 is the digit of coding), 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 }
8 groups of Serial No.s meet following relationship:
(Ak-Bk)*(Ak-Bk)+(Ck-Dk)*(Ck-Dk)=2L δk
(Ek-Fk)*(Ek-Fk)+(Gk-Hk)*(Gk-Hk)=2L δk
Wherein * is related operation.
2, modulation of source, the 8 groups of Serial No. A generated with encoderk、Bk、Ck、Dk、Ek、Fk、Gk、HkRespectively to light source into
Row modulation, the coded pulse light of generation is respectively xa、xb、xc、xd、xe、xf、xg、xh.As shown in Fig. 2, coded pulse light xa、xb、
xc、xdCoded pulse width be T1=10ns, coded pulse light xe、xf、xg、xhCoded pulse width be T2=11ns。T2Greatly
In T1, and T2–T1=T0=1ns, T2And T1It is T0Integral multiple (T1=mT0, m=10).
3, coded pulse light injects, by the coded pulse light x of the modulated output of light sourcea、xb、xc、xd、xe、xf、xg、xhRespectively
It is injected into entirely in optical fiber grating sensing optical cable.As shown in 3, passed entirely with the every two fiber grating of optical fiber grating sensing optical cable
Sensor interval 0.1m.
4, signal acquisition, with T0=1ns is the reflection signal point of complete same fiber grating of the periodic sampling after modulation of source
It Wei not ya、yb、yc、yd、ye、yf、yg、yh。
Wherein y1Indicate pulse optical width T1The corresponding complete same fiber Bragg grating reflected signal of=10ns, y1(n) simple venation is indicated
Wash width T off1Corresponding n-th of acquisition data (the sampling period T of=10ns0=1ns)；y2Indicate pulse optical width T2=
The corresponding complete same fiber Bragg grating reflected signal of 11ns, y2(n) pulse optical width T2Corresponding n-th of acquisition data of=11ns (are adopted
The sample period is T0=1ns).Due to T2Greater than T1, and T2–T1=T0=1ns, T2And T1It is T0Integral multiple (T1=mT0=
10T0), y1And y2Meet following relationship:
Wherein y0Indicate pulse optical width T0The corresponding complete same fiber Bragg grating reflected signal of=1ns, y0(n) simple venation is indicated
Wash width T off0Corresponding n-th of acquisition data (the sampling period T of=1ns0=1ns).As shown in figure 3, every two same optical fiber entirely
Grating sensor interval 0.1m, then every two is full 0.1m/ with the time interval that fiber-optic grating sensor reflected light is sampled
VThe light velocity× 2=1ns (light spread speed V in optical cableThe light velocity=2 × 108m/s).If shared the same light entirely using the injection of traditional single pulse light
Fine grating optical cable, pulse optical width T0The corresponding sampled signal of=1ns is 1 and believes entirely with the reflection of fiber-optic grating sensor
Number；Pulse optical width T1The corresponding sampled signal of=10ns is 10 entirely with the mixed of the reflection signal of fiber-optic grating sensor
It is folded；Pulse optical width T2The corresponding sampled signal of=11ns is 11 entirely with the mixed of the reflection signal of fiber-optic grating sensor
It is folded.When pulse optical width is T1=10ns and T2When=11ns, due to entirely existing with fiber-optic grating sensor reflection signal aliasing
As causing spatial resolution there was only 1m and 1.1m；As pulse optical width T0=1ns, although spatial resolution is 0.1m, by
It is T compared with pulse optical width in only 1 entirely with the reflection signal of fiber-optic grating sensor1=10ns and T2When=11ns,
The intensity of reflection signal wants much weaker, and the distance of detection is also shorter.
5. signal demodulates, by the sampled signal y after modulation of sourcea、yb、yc、ydWith Serial No. Ak、Bk、Ck、DkIt carries out
Related operation is (ya-yb)*(Ak-Bk)+(yc-yd)*(Ck-Dk), coded pulse width T can be demodulated1=10ns is corresponding complete same
The reflection signal of fiber grating is 2Ly1(n)=32y1(n)；By the sampled signal y after modulation of sourcee、yf、yg、yhWith number
Sequence Ek、Fk、Gk、HkCarrying out related operation is (ye–yf)*(Ek-Fk)+(yg-yh)*(Gk-Hk), coded pulse width can be demodulated
T2=11ns corresponding is full 2Ly with the reflection signal of fiber grating2(n)=32y2(n).Due to 2Ly2(n)-2Ly1(n)=2L
y0(n-m)=32y0(n-10), therefore coded pulse width T is demodulated0=1ns is corresponding to be with the reflection signal of fiber grating entirely
2Ly0=32y0, compare single pulse width T0=1ns is corresponding entirely with the reflection signal y of fiber grating0It is exaggerated 2L=32 times.
By carrying out the change of coding and pulse width to light source pulse light, by traditional single pulse width T1=10ns and T2=11ns pairs
1m the and 1.1m low spatial resolution answered is promoted to traditional single pulse width T0The corresponding 0.1m high spatial resolution of=1ns is (empty
Between resolution ratio=VThe light velocity× single pulse width/2, wherein light spread speed V in optical cableThe light velocity=2 × 108M/s), and than tradition
Single pulse width T0The corresponding reflected signal strength of=1ns increases 2L=32 times, extend entirely with optical fiber Grating examinations away from
From.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (6)
1. a kind of raising is entirely the same as the method for optical fiber Grating examinations performance, which is characterized in that method includes the following steps:
S1,8 groups of Serial No.s are generated by encoder, Serial No. is respectively set to 1 or 0, and meets corresponding encoding relation；
S2, light source is modulated respectively with 8 groups of Serial No.s that encoder generates, generates corresponding coded pulse light；
S3, coded pulse light of the light source after modulated is injected separately into entirely in optical fiber grating sensing optical cable；
S4, it is sampled with reflection signal of the specific period to the complete same fiber grating after modulation of source；
S5, by after modulation of source sampled signal and Serial No. be divided into two parts, carry out demodulation operation respectively, demodulation obtains
Its coded pulse width is corresponding entirely with the reflection signal of fiber grating；Obtain reflection signal spatial resolution and apart from equal
It is corresponding higher than single pulse width entirely with the reflection signal of fiber grating.
2. it is according to claim 1 raising entirely with the method for optical fiber Grating examinations performance, which is characterized in that in step S1 into
The method of row coding specifically:
Generate 8 groups of Serial No.s respectively by encoder are as follows: Ak、Bk、Ck、Dk、Ek、Fk、Gk、Hk, 0≤k < L, wherein L is coding
Digit, Ak、Bk、Ck、Dk、Ek、Fk、Gk、HkEqual to 1 or 0,8 groups of Serial No.s is made to meet following relationship:
(Ak-Bk)*(Ak-Bk)+(Ck-Dk)*(Ck-Dk)=2L δk
(Ek-Fk)*(Ek-Fk)+(Gk-Hk)*(Gk-Hk)=2L δk
Wherein * is related operation.
3. it is according to claim 2 raising entirely with the method for optical fiber Grating examinations performance, which is characterized in that in step S2 into
The method of line light source modulation specifically:
The 8 groups of Serial No. A generated with encoderk、Bk、Ck、Dk、Ek、Fk、Gk、HkLight source is modulated respectively, the volume of generation
Code pulsed light is respectively xa、xb、xc、xd、xe、xf、xg、xh；
Coded pulse light xa、xb、xc、xdCoded pulse width be T1, coded pulse light xe、xf、xg、xhCoded pulse width
For T2；T2Greater than T1, and T2–T1=T0, T2And T1It is T0Integral multiple, T1=mT0, wherein m is integer and m is more than or equal to 1.
4. it is according to claim 3 raising entirely with the method for optical fiber Grating examinations performance, which is characterized in that in step S3 into
The method of row coded pulse injection specifically:
By the coded pulse light x of the modulated output of light sourcea、xb、xc、xd、xe、xf、xg、xhIt is injected separately into and is passed entirely with fiber grating
In sensing optical cable.
5. it is according to claim 3 raising entirely with the method for optical fiber Grating examinations performance, which is characterized in that in step S4 into
The method of row signal sampling specifically:
With T0The reflection signal for the complete same fiber grating for being periodic sampling after modulation of source is respectively ya、yb、yc、yd、ye、yf、
yg、yh；Its expression formula is respectively as follows:
Wherein y1Indicate pulse optical width T1Corresponding complete same fiber Bragg grating reflected signal；y2Indicate pulse optical width T2It is corresponding
Complete same fiber Bragg grating reflected signal；Due to T2Greater than T1, and T2–T1=T0, T2And T1It is T0Integral multiple, T1=mT0,
Middle m is integer and m is more than or equal to 1, y1And y2Meet following relationship:
Wherein y0Indicate pulse optical width T0Corresponding complete same fiber Bragg grating reflected signal.
6. it is according to claim 5 raising entirely with the method for optical fiber Grating examinations performance, which is characterized in that in step S5 into
The method of row signal demodulation specifically:
By the sampled signal y after modulation of sourcea、yb、yc、ydWith Serial No. Ak、Bk、Ck、DkCarrying out related operation is (ya-
yb)*(Ak-Bk)+(yc-yd)*(Ck-Dk), demodulate coded pulse width T1It is corresponding to be with the reflection signal of fiber grating entirely
2Ly1(n)；
By the sampled signal y after modulation of sourcee、yf、yg、yhWith Serial No. Ek、Fk、Gk、HkCarrying out related operation is (ye–
yf)*(Ek-Fk)+(yg-yh)*(Gk-Hk), demodulate coded pulse width T2It is corresponding to be with the reflection signal of fiber grating entirely
2Ly2(n)；
According to 2Ly2(n)-2Ly1(n)=2L y0(n-m), therefore coded pulse width T is demodulated0It is corresponding entirely with fiber grating
Reflection signal is 2Ly0, compare single pulse width T0It is corresponding entirely with the reflection signal y of fiber grating0It is exaggerated 2L times.
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| CN110855371A (en) * | 2019-11-08 | 2020-02-28 | 武汉理工光科股份有限公司 | Method and system for improving optical fiber sensing detection spatial resolution |
| CN110855371B (en) * | 2019-11-08 | 2022-10-04 | 武汉理工光科股份有限公司 | Method and system for improving optical fiber sensing detection spatial resolution |
| CN111750912A (en) * | 2020-06-23 | 2020-10-09 | 武汉烽理光电技术有限公司 | High-spatial-resolution high-capacity grating array OTDR differential demodulation method and system |
| CN111750912B (en) * | 2020-06-23 | 2022-07-15 | 武汉烽理光电技术有限公司 | High-spatial-resolution high-capacity grating array OTDR differential demodulation method and system |
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