CN100447828C - Distributed optical fiber temperature measuring method - Google Patents
Distributed optical fiber temperature measuring method Download PDFInfo
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- CN100447828C CN100447828C CNB2007100139334A CN200710013933A CN100447828C CN 100447828 C CN100447828 C CN 100447828C CN B2007100139334 A CNB2007100139334 A CN B2007100139334A CN 200710013933 A CN200710013933 A CN 200710013933A CN 100447828 C CN100447828 C CN 100447828C
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000013307 optical fiber Substances 0.000 title claims abstract description 21
- 238000009825 accumulation Methods 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 41
- 238000004904 shortening Methods 0.000 claims 1
- 238000009529 body temperature measurement Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 230000000750 progressive effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The invention discloses a distribution optical fiber temperature measure method (data process). Since measured signal is ultra weak submerged in noise, user needs weak signal process method to obtain the temperature information. The digit electric technique and the computer technique are the effective method for the data process of distribution optical fiber temperature measurement. And the process on the weak signal is digit accumulated average. Since the measure signal is assured and the noise is random signal, the accumulation can effectively improve signal/noise ratio. But the measure accumulation needs long measure time, and according to the character of distribution optical fiber temperature measurement, the continuous measured temperature information is correlative, and each measure data is stored. Therefore, the invention uses the last measured m measure data and local n-m data in the n measure data, to confirm the measure accuracy, and the local calculation only measures n-m times, to effectively reduce measure time.
Description
Affiliated technical field:
The invention belongs to the measuring technique class, is a kind of distributed optical fiber temperature measuring method.Be particularly related to distributed light temperature measurement signal and handle (specifically a kind of data processing method in distributed optical fiber temperature measuring), can improve the computing velocity of measurement data, improve measure of system performance.
Background technology:
We know that in the distributed optical fiber temperature measuring system, optical fiber promptly uses as sensor again as transmission medium.By bidirectional coupler and wavelength division multiplexer, laser pulse is transmitted in the optical fiber.With measure field situation difference, carry the Raman scattered light of optical fiber real time temperature information and can return along fiber reflection, by electrooptical device these scattered lights are gathered.Because Raman scattered light is more weak, signal is submerged in the noise fully, and signal to noise ratio (S/N ratio) is very little, needs to adopt the disposal route of feeble signal that detection signal is handled, and improves signal to noise ratio (S/N ratio).
Large scale integrated circuit and electronic technology and Digital Signal Processing have obtained to use widely in recent ten years in high-accuracy data acquisition and measuring system.Because the signal of measuring is very faint, general digital signal processing method is to adopt the method for repeatedly measuring and adding up to improve signal to noise ratio (S/N ratio).
The digital average course of work is: by sampling holder measured signal is taken a sample, by A/D converter the measured signal sampling value is transformed to digital quantity again, and it is stored in register or the storer; The calculating process of progressive mean is finished by hardware circuit, microprocessing unit (MPU) or digital signal processor (DSP), and operation result is stored in register or the storer, and can export corresponding analog quantity by D/A converter.Computing machine is eliminated noise to measurement data (should be binary channels, double, comprise anti-Stokes signal and Stokes signal) storage and accumulation process, obtains the feeble signal of measuring.Because measured signal is deterministic signal, so multiple averaging still is signal itself after calculating; And interference noise is a random noise, and its effective value can greatly reduce after the multiple averaging, thereby improves signal to noise ratio (S/N ratio).When the pollution noise was white noise, n the different cumulative means of sampling values constantly can make signal to noise ratio (S/N ratio) improve
Doubly.So accumulative frequency (measurement number of times) is many more, signal to noise ratio (S/N ratio) is improved obvious more.But measuring increasing of number of times can the lengthening Measuring Time.So performance of the effective improvement of good signal processing method meeting system.
Summary of the invention:
The purpose of this invention is to provide a kind of computing velocity that can improve measurement data, improve the distribution type optical-fiber temperature measuring data treatment method of measure of system performance.
To achieve the above object of the invention, realize by following measure.
The method that a kind of distribution type optical fiber temperature measuring data is handled, it is characterized in that under the prerequisite that guarantees measuring accuracy for improving measuring speed, in digital average accumulation calculating, adopt the last time data of measurement data and this measurement of part, total accumulation calculating data volume is constant and Measuring Time can shorten to original (n-m)/n doubly
Above-mentioned said method improves signal to noise ratio (S/N ratio) to the processing of measuring-signal by digital progressive mean.Measurement data is many more, and it is good more that signal to noise ratio (S/N ratio) is improved, but Measuring Time is long more.According to the performance and the measuring accuracy requirement of measuring system, digital average measurement number of times is also determined.Each Measuring Time certain (being determined by the emitted laser pulsed frequency) then satisfies the measurement T.T. (n measurement) of measuring accuracy and determines that for Measuring Time adds computing time, and Measuring Time is a major influence factors.Because the emitted laser pulsed frequency determines that with factors such as sensor fibre length precision prescribed is high more, Measuring Time will be long more.Therefore each Measuring Time is all long in distributed optical fiber temperature measuring.
Consideration temperature in distributed optical fiber temperature measuring is slow continually varying, that is to say that adjacent measurement points is closely related.Therefore, the information before the utilization is possible and to be fruitful in current measuring-signal processing procedure.In digital progressive mean computation process, measuring-signal each time all will be stored, and the process that adds up just improves the process of signal to noise ratio (S/N ratio).So the data in the actual computation are made up of two parts, last time the effect of measurement data was to improve signal to noise ratio (S/N ratio), and the effect of this measurement mainly is the temperature information that obtains measurement.
Advantageous effect of the present invention is: by utilizing last time sampled measurement and this sampled measurement addition, strengthen accumulative frequency, thereby improve the signal to noise ratio (S/N ratio) of system, shorten Measuring Time.
Description of drawings:
Fig. 1 is that detection signal of the present invention is handled block diagram.
Embodiment
Below the present invention is further described:
The method that a kind of distribution type optical fiber temperature measuring data is handled, it is characterized in that under the prerequisite that guarantees measuring accuracy for improving measuring speed, in digital average accumulation calculating, adopt the last time data of measurement data and this measurement of part, total accumulation calculating data volume is constant and Measuring Time can shorten to original (n-m)/n doubly, for realizing high-acruracy survey, system need carry out accumulation calculating to a large amount of measurement data, improves signal to noise ratio (S/N ratio), obtains the temperature information of measuring.The each result who measures of memory stores in the actual measurement like this, in new measurement, is the measuring accuracy that obtains requirement, establishes and need carry out n accumulation calculating (being n measurement).For reducing Measuring Time (measurement number of times), and measuring accuracy is constant, in n measurement data of current calculating, (each measurement data is all stored to adopt back m the measurement data of last time measuring calculating, realization is easy to) add n-m measurement data of current measurement, then total measurement number of times is constant, and measuring accuracy is also constant, but the actual measurement time is only measured the used time for carrying out n-m time, has promptly shortened actual Measuring Time.The storage of all measurement data, calculating etc. are all finished by digital display circuit (computing machine), in distributed measurement, because data volume is bigger, the management of measurement data are finished by database.
Claims (4)
1, a kind of distributed optical fiber temperature measuring method, by AD converter the optical fiber output signal is converted to digital quantity, it is characterized in that: the described digital quantity of repeatedly measuring and store each measurement gained, in to the average accumulation calculating of described digital quantity, adopt part last time measurement data and this measurement data simultaneously, in the hope of the temperature of testee.
2, distributed optical fiber temperature measuring method as claimed in claim 1, it is characterized in that: described part last time measurement data is m time, this measurement data is n-m time, this m time measurement data and this n-m time measurement data is carried out accumulation calculating n time, to improve the signal to noise ratio (S/N ratio) of measuring-signal.
3, distributed optical fiber temperature measuring method as claimed in claim 1, it is characterized in that: measuring accuracy is constant, and Measuring Time shortens.
4, distributed optical fiber temperature measuring method according to claim 1, it is characterized in that guaranteeing precision, shortening in the algorithm of Measuring Time, can be adjusted at flexibly and last time measure in the accumulation calculating process ratio of measuring number of times with this, reflected measurement time and the corresponding relation of measuring temperature on request.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100139334A CN100447828C (en) | 2007-03-20 | 2007-03-20 | Distributed optical fiber temperature measuring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100139334A CN100447828C (en) | 2007-03-20 | 2007-03-20 | Distributed optical fiber temperature measuring method |
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| Publication Number | Publication Date |
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| CN101059908A CN101059908A (en) | 2007-10-24 |
| CN100447828C true CN100447828C (en) | 2008-12-31 |
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| CNB2007100139334A Expired - Fee Related CN100447828C (en) | 2007-03-20 | 2007-03-20 | Distributed optical fiber temperature measuring method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07243920A (en) * | 1994-03-08 | 1995-09-19 | Sumitomo Electric Ind Ltd | Optical fiber temperature distribution measuring system |
| US5618108A (en) * | 1992-06-16 | 1997-04-08 | Kabushiki Kaisha Toshiba | Temperature distribution measuring apparatus using an optical fiber |
| CN1400453A (en) * | 2001-07-27 | 2003-03-05 | 中国计量学院 | Distributed optical fibre temperature sensor system |
| CN1444026A (en) * | 2003-04-17 | 2003-09-24 | 中国计量学院 | Long-range 30 km distributed optical fibre Raman temperature sensor system |
| US20060018586A1 (en) * | 2002-11-01 | 2006-01-26 | Kinzo Kishida | Distributed optical fiber sensor system |
| CN1892195A (en) * | 2005-07-06 | 2007-01-10 | 威海康威通信技术有限公司 | Distribution type optical-fiber temperature measuring data treatment method |
-
2007
- 2007-03-20 CN CNB2007100139334A patent/CN100447828C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5618108A (en) * | 1992-06-16 | 1997-04-08 | Kabushiki Kaisha Toshiba | Temperature distribution measuring apparatus using an optical fiber |
| JPH07243920A (en) * | 1994-03-08 | 1995-09-19 | Sumitomo Electric Ind Ltd | Optical fiber temperature distribution measuring system |
| CN1400453A (en) * | 2001-07-27 | 2003-03-05 | 中国计量学院 | Distributed optical fibre temperature sensor system |
| US20060018586A1 (en) * | 2002-11-01 | 2006-01-26 | Kinzo Kishida | Distributed optical fiber sensor system |
| CN1444026A (en) * | 2003-04-17 | 2003-09-24 | 中国计量学院 | Long-range 30 km distributed optical fibre Raman temperature sensor system |
| CN1892195A (en) * | 2005-07-06 | 2007-01-10 | 威海康威通信技术有限公司 | Distribution type optical-fiber temperature measuring data treatment method |
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| CN101059908A (en) | 2007-10-24 |
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