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High-precision temperature demodulation method for distributed fiber Raman sensor

A technology of distributed optical fiber and demodulation method, which is applied in the field of high-precision temperature demodulation for distributed optical fiber Raman sensors, can solve the problems such as the decrease of the temperature measurement accuracy of the system, and achieve the effect of reasonable design

Active Publication Date: 2018-11-23
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problem that the temperature measurement accuracy of the system drops sharply due to Rayleigh noise interference and other phenomena in the existing distributed optical fiber Raman sensing system, the present invention proposes a high-precision temperature solution for the distributed optical fiber Raman temperature sensing system. Adjust the method, so that the temperature measurement accuracy is expected to reach ± ​​0.1 ℃

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  • High-precision temperature demodulation method for distributed fiber Raman sensor
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Embodiment Construction

[0037] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] A high-precision temperature demodulation method for a distributed optical fiber Raman sensing system is realized by the following device. The device includes a 1550nm high-power pulsed laser, a wavelength division multiplexer (WDM), two avalanche photodiodes (APD), two low-noise amplifiers (LNA), the sensing fiber to be tested (ordinary multimode fiber), data acquisition card and computer.

[0039] The specific method is divided into the following four steps.

[0040] Step 1. Build a high-precision temperature detection device for distributed optical fiber Raman sensing system

[0041] Such as figure 1As shown, the fiber optic Raman thermometer includes a pulse laser, WDM, 2 APDs, 2 LNAs, a data acquisition card, and a computer; wherein, the output end of the pulse laser 1 is connected to the input end of the WDM 2 . The input end ...

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Abstract

The invention discloses a temperature demodulation method for a fiber Raman temperature sensing system. The method comprises the following steps: 1, the above high-precision temperature device for thedistributed fiber Raman sensing system is built; 2, signal processing of Stokes light and anti-Stokes light in a calibration stage is carried out; 3, signal processing of Stokes light and anti-Stokeslight in a measurement stage is carried out; and 4, a high-precision temperature demodulation method for the distributed fiber Raman sensing system is carried out. The design is reasonable, the problem of low temperature measurement precision of the system caused by Reyleith light crosstalk in the existing distributed fiber Raman temperature measurement system can be effectively solved, the temperature measurement precision can be expected to arrive within + / -0.1 DEG C, and the method is applicable to the distributed fiber Raman temperature measurement system.

Description

technical field [0001] The invention relates to the field of temperature demodulation in distributed optical fiber sensing systems, in particular to a high-precision temperature demodulation method for distributed optical fiber Raman sensors. Background technique [0002] Distributed fiber optic sensors are the source of industrial data and the basis for intelligent transformation and upgrading. Optical fiber sensing technology is capable of large-scale continuous monitoring, precise positioning of processing space, timely and accurate diagnosis of faults, and good expansion and upgrading capabilities, which can meet the needs of intelligent manufacturing with complex structures and ever-changing functions. Due to the complicated wiring of traditional electronic sensing systems, the system is susceptible to various problems such as electromagnetic interference, lightning strikes, and humid weather interference during use. Therefore, it has not been widely used in many key ar...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32
CPCG01K11/32G01K11/324G01K15/005
Inventor 张明江李健张建忠乔丽君王涛王云才靳宝全王宇王东
Owner TAIYUAN UNIV OF TECH
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