Fit attenuation difference temperature self-correction method for distributed optical fiber Raman temperature measurement system

A distributed optical fiber and Raman temperature measurement technology, which is applied in the direction of physical/chemical changes in thermometers, thermometers, thermometer testing/calibration, etc., can solve problems such as errors, and achieve the effect of accurate detection, accurate measurement, and error avoidance

Active Publication Date: 2019-09-13
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a temperature self-correction method for fitting the attenuation difference of a distributed optical fiber Raman temperature measurement system, which has the advantage of replaci

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  • Fit attenuation difference temperature self-correction method for distributed optical fiber Raman temperature measurement system
  • Fit attenuation difference temperature self-correction method for distributed optical fiber Raman temperature measurement system
  • Fit attenuation difference temperature self-correction method for distributed optical fiber Raman temperature measurement system

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Embodiment Construction

[0035] The present invention will be further explained by specific examples below.

[0036] The invention provides a temperature self-correction method for fitting the attenuation difference of a distributed optical fiber Raman temperature measurement system, such as Figure 1-4 As shown, a temperature self-correction method for fitting the attenuation difference of a distributed optical fiber Raman temperature measurement system, the temperature correction method includes the following steps;

[0037] Step (1): Take a single-mode optical fiber with a total length L as the sensing optical fiber 6, and place the optical fiber segment I8 and the optical fiber segment II9 of the same length on the sensing optical fiber 6 in the incubator 7, and the center point of the optical fiber segment I8 The distance from the head end of the sensing fiber 6 and the distance from the center point of the fiber segment II 9 to the end of the sensing fiber 6 are equal, and the other parts of the...

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Abstract

The invention relates to a fit attenuation difference temperature self-correction method for a distributed optical fiber Raman temperature measurement system. According to the invention, a Stokes light and anti-Stokes light attenuation coefficient difference equation is obtained by a temperature demodulation principle; a fit curve equation of an attenuation coefficient difference relative to a temperature is obtained by a fit curve; a temperature demodulation equation is obtained by a ratio of the fit curve equation to luminous flux; after demodulation, primary correction on a temperature is implemented; then Rayleigh noise is solved by combining a relationship between Stokes light and anti-Stokes light signals and the Rayleigh noise; further a corrected temperature demodulation formula isobtained; and after demodulation, secondary correction is implemented. The temperature self-correction aim is fulfilled; and compared to a conventional method of eliminating the Rayleigh noise, the fit attenuation difference temperature self-correction method improves temperature correction, implements accurate measurement on the temperature, avoids an error problem caused by approximate equalization processing on Stokes light and anti-Stokes light attenuation coefficients, and meets accurate detection on temperatures of a mine goaf and an adjacent old goaf.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing instruments, in particular to a temperature self-correction method for fitting attenuation difference of a distributed optical fiber Raman temperature measurement system. Background technique [0002] With the sustained and rapid development of the economy, my country's demand for energy is increasing. In order to ensure the safety of coal mine mining and prevent spontaneous combustion, it is necessary to detect the temperature of the coal mine goaf and the adjacent old goaf. At present, the coal mine spontaneous combustion temperature monitoring The distributed optical fiber Raman temperature measurement system adopted, due to the different sensitivity of Stokes light and anti-Stokes light in Raman scattered light to temperature, the optical fiber can be accurately measured by ratio demodulation method combined with optical time domain reflection technology The position and temperatur...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K11/324
CPCG01K11/32G01K11/324G01K15/005
Inventor 马天兵訾保威郭永存凌六一黄友锐贾晓芬
Owner ANHUI UNIV OF SCI & TECH
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