CN105466478B - A kind of optical fibre interrogation system passage consistency calibration method - Google Patents
A kind of optical fibre interrogation system passage consistency calibration method Download PDFInfo
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- CN105466478B CN105466478B CN201510901232.9A CN201510901232A CN105466478B CN 105466478 B CN105466478 B CN 105466478B CN 201510901232 A CN201510901232 A CN 201510901232A CN 105466478 B CN105466478 B CN 105466478B
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- optical fibre
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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
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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Abstract
The present invention relates to a kind of optical fibre interrogation system passage consistency calibration method, it is adaptable to the passage consistency calibration of the multichannel optical fiber demodulating system based on photoswitch or multichannel photo-coupler, belongs to technical field of optical fiber sensing.The present invention synchronizes real time calibration by calibrated channel demodulating data after optical fibre interrogation system completes a multi-channel measurement to remaining Measurement channel demodulating data, it is ensured that each interchannel of optical fibre interrogation system has preferably demodulation uniformity.The present invention synchronizes real time calibration to Measurement channel by calibrated channel, and simple in construction, computation complexity is low, in the case where not influenceing optical fibre interrogation system original structure, and the passage consistency that optical fibre interrogation system can be completed by software calibrates calculating.
Description
Technical field
The present invention relates to a kind of optical fibre interrogation system passage consistency calibration method, more particularly to based on photoswitch or multichannel
The passage consistency calibration of the multichannel optical fiber demodulating system of photo-coupler, belongs to technical field of optical fiber sensing.
Background technology
With the continuous maturation of optical fiber sensing technology, single-point and one-parameter sensing obviously can not meet wanting for people
Ask, extensive, distributed sensing technology turns into study hotspot.Sensing network is constituted using Fibre Optical Sensor multiplexing technology, is entered
The multimetering of row large area has more and more been applied among the multiple spot of large scale structure and many reference amounts health monitoring, and this is just
Multichannel demodulation techniques to Fibre Optical Sensor propose higher requirement.
Optical fibre interrogation system is when extending multichannel generally using by the way of photoswitch switching or multichannel photo-coupler divides
The mode of light, but both modes can all cause there is certain demodulating error between each Measurement channel.In order to solve optical fiber
The problem of demodulation result is inconsistent between demodulating system Measurement channel is, it is necessary to which the demodulation result to multichannel optical fiber demodulating system is carried out
Calibration research, so as to ensure that each interchannel has preferably demodulation uniformity, and then preferably apply in different physical quantities
In Fibre Optical Sensor measurement.
The content of the invention
The purpose of the present invention is to synchronize real time calibration to remaining Measurement channel by calibrated channel, so as to ensure each
Interchannel has preferably demodulation uniformity, overcomes in multichannel optical fiber demodulating system that interchannel demodulation result is inconsistent to ask
There is provided a kind of optical fibre interrogation system passage consistency calibration method for topic.
The purpose of the present invention is achieved through the following technical solutions.
A kind of optical fibre interrogation system passage consistency calibration method, is comprised the following steps that：
Step one：Any one Measurement channel connection standard wave length of multichannel optical fiber demodulating system is constituted into calibration logical
Road, calibrated channel demodulating data y is obtained by multichannel optical fiber demodulating systemi, i=1,2 ... ..., N, N be 10 to 100 between
Positive integer；
Step 2：Y according to obtained by step oneiOffset correction sequence Δ y is obtained by calculatingi, Δ yi=yi-Yi, i=1,
2 ... ..., N, wherein YiFor the demarcation peak-data at the N number of output peak of standard wave length；
Step 3：The demodulating data x of remaining Measurement channel is obtained by multichannel optical fiber demodulating systemkj, k=1,
2 ... ..., M-1, j=1,2 ... ..., P, M is the port number of multichannel optical fiber demodulating system, and P is connected by each Measurement channel
Fibre optical sensor number；
Step 4：Search configuration modifications factor Δ xkj, pass through sequence of calculation │ xkj-yiIt is minimum in │ (i=1,2 ... ..., N)
Index where value, searches the corresponding offset correction sequence Δ y of the indexiWith Δ yi+1, calculate and obtain modifying factor Δ xkj=Δ
yi+(yi-xkj)*(Δyi+1-Δyi)/(yi+1-yi)；
Step 5：By to Measurement channel demodulating data xkjIt is modified and obtains Xkj=xkj+Δxkj, k=1,2 ... ...,
M-1, j=1,2 ... ..., P complete the calibration of optical fibre interrogation system passage consistency.
A kind of optical fibre interrogation system passage consistency calibration method in the present invention is applied to be based on photoswitch or multichannel light
The passage consistency calibration of the multichannel optical fiber demodulating system of coupler.After optical fibre interrogation system completes a multi-channel measurement
Real time calibration is synchronized to remaining Measurement channel demodulating data by calibrated channel demodulating data.Can be in high-speed digital signal
The passage consistency calibration that optical fibre interrogation system is completed in process chip or large-scale programmable logic array chip is calculated,
The passage consistency calibration that optical fibre interrogation system can be completed in the upper computer softwares such as LabVIEW is calculated.
Beneficial effect
A kind of optical fibre interrogation system passage consistency calibration method of the present invention, is carried out by calibrated channel to Measurement channel
Synchronous real time calibration, simple in construction, computation complexity is low, in the case where not influenceing optical fibre interrogation system original structure, can be with
The passage consistency for completing optical fibre interrogation system by software, which is calibrated, to be calculated.
Brief description of the drawings
Fig. 1 is passage consistency calibration method FB(flow block) of the invention.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
Embodiment 1
The present embodiment carries out passage consistency calibration using the multichannel optical fiber demodulating system based on photoswitch
A kind of optical fibre interrogation system passage consistency calibration method, is realized by following steps：
Step 1：First Measurement channel connection standard wave length of multichannel optical fiber demodulating system is constituted into calibrated channel, led to
Cross optical fibre interrogation system and obtain calibrated channel demodulating data yi=(..., 1556.34668,1555.52832 ... ...), i=1,
2 ... ..., 50；
Step 2：Offset correction sequence Δ y is obtained by calculatingi, Δ yi=yi-Yi=(..., -0.15820, -
0.16992 ... ...), i=1, wherein 2 ... ..., 50, Yi=(..., 1556.50488,1555.69824 ... ...) it is standard
The demarcation peak-data at 50 output peaks of wavelength；
Step 3：The demodulating data x of second Measurement channel is obtained by multichannel optical fiber demodulating system21=
1556.14063, second Measurement channel is only connected to a fibre optical sensor；
Step 4：Search configuration modifications factor Δ x21, pass through sequence of calculation │ x21-yiMinimum value in │ (i=1,2 ... ..., N)
The index at place, searches the corresponding offset correction sequence Δ y of the indexi=-0.15820 and Δ yi+1=-0.16992, is calculated
To modifying factor Δ x21=Δ yi+(yi-x21)*(Δyi+1-Δyi)/(yi+1-yi)=- 0.161153789；
Step 5：By to second Measurement channel demodulating data x21It is modified and obtains X21=x21+Δx21=
1555.97947, complete the passage consistency calibration of second Measurement channel.
Result of the test
In order to illustrate effect of the present invention, using the passage consistency calibration method of the present invention to the multichannel based on photoswitch
Optical fibre interrogation system carries out passage consistency calibration.One fibre optical sensor is placed on the constant code test case of temperature stabilization
In, it is coupled with each Measurement channel and synchronizes real time calibration.By demodulating data after not calibrated demodulating data and calibration in table 1
Comparative analysis is carried out.
The optical fibre interrogation system Measurement channel demodulating data of table 1
| Measurement channel | Not calibrated demodulating data | Demodulating data after calibration |
| Passage one | 1556.141nm | 1555.979nm |
| Passage two | 1556.127nm | 1555.978nm |
| Passage three | 1556.156nm | 1555.980nm |
| Passage four | 1556.121nm | 1555.978nm |
| Passage five | 1556.133nm | 1555.979nm |
| Passage six | 1556.165nm | 1555.980nm |
| Passage seven | 1556.138nm | 1555.979nm |
| Interchannel maximum deviation | 0.025nm | 0.001nm |
Passage consistency calibration method by using the present invention can be seen that to base by the test data analyzer of table 1
Passage consistency calibration is carried out in the multichannel optical fiber demodulating system of photoswitch, interchannel maximum deviation is reduced to 0.001nm.
Above-described to specifically describe, purpose, technical scheme and beneficial effect to invention have been carried out further specifically
It is bright, the specific embodiment that the foregoing is only the present invention is should be understood that, for explaining the present invention, is not used to limit this
The protection domain of invention, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should
Within protection scope of the present invention.
Claims (5)
1. a kind of optical fibre interrogation system passage consistency calibration method, it is characterised in that：Comprise the following steps that：
Step one：Any one Measurement channel connection standard wave length of multichannel optical fiber demodulating system is constituted into calibrated channel, led to
Cross multichannel optical fiber demodulating system and obtain calibrated channel demodulating data yi, i=1,2 ... ..., N, N be 10 to 100 between it is just whole
Number；
Step 2：Y according to obtained by step oneiOffset correction sequence Δ y is obtained by calculatingi, Δ yi=yi-Yi, i=1,
2 ... ..., N, wherein YiFor the demarcation peak-data at the N number of output peak of standard wave length；
Step 3：The demodulating data x of remaining Measurement channel is obtained by multichannel optical fiber demodulating systemkj, k=1,2 ... ..., M-
1, j=1,2 ... ..., P, M are the port number of multichannel optical fiber demodulating system, the Fibre Optical Sensor that P is connected by each Measurement channel
Device number；
Step 4：Search configuration modifications factor Δ xkj, k=1,2 ... ..., M-1, j=1,2 ... ..., P pass through sequence of calculation │
xkj-yiIndex in │ i=1,2 ... ..., N where minimum value, searches the corresponding offset correction sequence Δ y of the indexiAnd Δ
yi+1, calculate and obtain modifying factor Δ xkj=Δ yi+(yi-xkj)*(Δyi+1-Δyi)/(yi+1-yi)；
Step 5：By to Measurement channel demodulating data xkjIt is modified and obtains Xkj=xkj+Δxkj, k=1,2 ... ..., M-1, j
=1,2 ... ..., P complete the calibration of optical fibre interrogation system passage consistency.
2. a kind of optical fibre interrogation system passage consistency calibration method as claimed in claim 1, it is characterised in that：Methods described
The logical of optical fibre interrogation system can be completed in high-speed digital video camera chip or large-scale programmable logic array chip
Trace consistency calibration is calculated, and the passage consistency calibration that optical fibre interrogation system can be also completed in upper computer software is calculated.
3. a kind of optical fibre interrogation system passage consistency calibration method as described in claim 1 or claim 2, its feature exists
In：Methods described is applied to the passage consistency school of the multichannel optical fiber demodulating system based on photoswitch or multichannel photo-coupler
It is accurate.
4. a kind of optical fibre interrogation system passage consistency calibration method as described in claim 1 or claim 2, its feature exists
In：Methods described is logical to remaining measurement by calibrated channel demodulating data after optical fibre interrogation system completes a multi-channel measurement
Road demodulating data synchronizes real time calibration.
5. a kind of optical fibre interrogation system passage consistency calibration method as claimed in claim 2, it is characterised in that：It is described upper
Machine software includes LabVIEW.
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| CN101586986B (en) * | 2009-07-07 | 2011-05-11 | 北京交通大学 | High precision optical fiber grating wave length demodulation system |
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