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A demodulation method and device for a serial optical fiber Raman temperature system

A demodulation device and demodulation method technology, applied in the field of electronic information, can solve the problems of poor matching of optical fiber loss factor, inability to reduce the flatness at the same temperature, etc., to eliminate transmission loss, eliminate instability and coupled random noise , the effect of high-precision measurement

Active Publication Date: 2017-11-10
成都瑞莱杰森科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Now the backscattering Rayleigh technology can be used to detect the physical structure of the optical cable over 80km, and the longest single-channel optical fiber length of the reported Raman temperature system is only 30km, because the anti-Stokes / Rayleigh or anti-Stokes / Stokes two-way demodulation method, anti-Stokes / Rayleigh demodulation is limited by their poor fiber loss factor matching, according to the report of China Metrology Institute, using additional cost to obtain anti-Stokes light Only Rayleigh backscattering at the same wavelength can achieve a 30km Raman temperature system. Anti-Stokes / Stokes demodulation is limited by the threshold power of Stokes. The above two demodulation methods cannot reduce the same temperature Flatness (refers to the same external temperature, the maximum / minimum temperature measured on the sensing fiber)

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  • A demodulation method and device for a serial optical fiber Raman temperature system
  • A demodulation method and device for a serial optical fiber Raman temperature system
  • A demodulation method and device for a serial optical fiber Raman temperature system

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Embodiment 1

[0045] This embodiment provides a method for demodulating a tandem optical fiber Raman temperature system, comprising the following steps:

[0046] Step 1, using a periodic pulsed laser to inject laser light into the sensing fiber to obtain the backscattered anti-Stokes light information detected by the adjacent site and the temperature information of the incident end of the sensing fiber at the adjacent site;

[0047] Step 2, multiplying the backscattered anti-Stokes light information of the same measurement point on the sensing fiber at adjacent stations and then square rooting to obtain the processed backscattered anti-Stokes light information;

[0048] Step 3: Use the temperature information at the incident end of the sensing fiber at the adjacent site to demodulate the processed backscattered anti-Stokes light information at the same measurement point, and obtain the measured temperature at the same measurement point on the sensing fiber relative to the adjacent site ;

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Embodiment 2

[0075] The serial optical fiber Raman temperature system demodulation device provided by this embodiment is as follows: figure 1 As shown (the thick line in the connecting line indicates the cable, and the thin line indicates the optical cable), the detection station installed on the sensing fiber includes a laser driver 11, a laser 12, an optical fiber circulator 13, a wavelength division multiplexer 15, a photoelectric detector Device assembly 16, microprocessor 17, electronic thermometer 18 and modem 19 with network port, network server sends start command to each site, modem 19 receives start command, starts laser driver 11, makes laser driver 11 drive laser periodically 12 emits laser light, and the laser light is injected into the sensing fiber 14 through the optical fiber circulator 13, and the backscattered light generated by the sensing fiber 14 is guided to the wavelength division multiplexer 15 through the optical fiber circulator 13, and the wavelength division mul...

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Abstract

The invention provides a serial optical fiber Raman temperature system demodulation method using the backscattered anti-Stokes light information obtained by the adjacent site on the sensing fiber and the temperature information of the incident end of the sensing fiber at the adjacent site , after temperature demodulation and other processing, the temperature of each measurement point on the sensing fiber is obtained. The invention further provides a serial optical fiber Raman temperature system demodulation device. Through the above demodulation method and device, the single-channel two-way demodulation method is evolved into two-way demodulation, which can not only improve the measurement accuracy of the temperature of the sensing fiber, but also effectively reduce the same temperature flatness, and effectively eliminate the instability and coupling of the light source. Due to the influence of random noise, the sensing length between adjacent stations can reach more than 30km.

Description

technical field [0001] The invention belongs to the technical field of electronic information, and relates to a photoelectric sensing technology, in particular to a demodulation method and device of a serial optical fiber Raman temperature system. Background technique [0002] The optical fiber Raman temperature sensing system integrates sensing and transmission, which can realize long-distance measurement and monitoring. One-dimensional distribution map of the entire optical fiber area can be obtained by one measurement; the measured area can be measured by erecting the optical fiber in a grating shape The two-dimensional and three-dimensional distribution of the sensor can obtain dozens, hundreds or even thousands of pieces of information on a sensing fiber loop that is several thousand meters long. Now the sensing fiber becomes very cheap with the significant reduction in manufacturing cost, so The unit information cost is significantly reduced. [0003] In the harsh env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/324
CPCG01K11/32G01K11/324
Inventor 张利勋陈雨霖
Owner 成都瑞莱杰森科技有限公司