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A high-precision temperature demodulation method for distributed optical fiber Raman sensors

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 of system temperature measurement accuracy drop and achieve reasonable design effects

Active Publication Date: 2020-01-03
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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  • A high-precision temperature demodulation method for distributed optical fiber Raman sensors
  • A high-precision temperature demodulation method for distributed optical fiber Raman sensors
  • A high-precision temperature demodulation method for distributed optical fiber Raman sensors

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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 an optical fiber Raman temperature sensing system, comprising the following steps: Step 1, building the above-mentioned high-precision temperature detection device for a distributed optical fiber Raman sensing system; Step 2, calibration The signal processing of Stokes light and anti-Stokes light in the stage; the third step, the signal processing of Stokes light and anti-Stokes light in the measurement stage; the fourth step, a high-precision temperature demodulation method for distributed optical fiber Raman sensing system. The invention has a reasonable design, effectively solves the problem of low temperature measurement accuracy of the system due to Rayleigh optical crosstalk in the existing distributed optical fiber Raman temperature measurement system, and is expected to make the temperature measurement accuracy within ±0.1°C, and is suitable for distributed Optical 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 Patents(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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