A parameter calibration and automatic calibration method for distributed optical fiber temperature measurement system

Abstract

The invention relates to a parameter calibration and automatic correction method for a distributed optical fiber temperature measurement system. The method is used for solving the parameter calibration problem of a DTS system and automatic parameter correction problem in the temperature measurement process. According to the calibration method, the characteristics of the distributed optical fiber temperature measurement system are simplified into three parameters alpha, beta and Q, and the three parameters are calibrated in advance by using two or three thermostatic baths; and because the parameters alpha and beta are stable, the stability of the parameter Q is low, and the parameter Q is calibrated in real time in the operating process, so that the aim of automatically correcting the parameters of the system is fulfilled. The temperature measurement formula of the distributed optical fiber temperature measurement system based on Raman backscattering is simplified, the calibration method is simplified, the calibration efficiency is improved, the drift of photoelectric characteristics of the system can be overcome during actual engineering application, and the aim of performing continuous long-term accurate measurement is fulfilled.

Description

technical field [0001] The invention relates to a distributed optical fiber temperature sensing system, which belongs to the technical field of optical fiber temperature sensing, in particular to a parameter calibration and automatic calibration method for a distributed optical fiber temperature measurement system, which is a calibration method in distributed sensing and Calibration method for long-term use. Background technique [0002] Optical fiber temperature sensor is a new technology in temperature measurement technology, and it is also one of the most widely used sensors in industry. The emergence of distributed fiber optic temperature sensors greatly reduces the cost of obtaining unit information, which is undoubtedly a revolution for temperature sensors based on electrical signals and point fiber grating temperature sensors. Distributed optical fiber temperature sensing technology is to use optical fiber to measure the temperature field distribution along the conti...

AI Technical Summary

Problems solved by technology

However, since the individual parameters will change with the photoelectric characteristics of the system, the long-term work of DTS will cause the measurement error to gradually expand, so it is necessary to correct the parameters

[0004] The traditional calibration method is actually to recalibrate all parameters. Since the optical fiber in use has been laid to the engineering site, it is difficult to recalibrate, and the feasibility is low and the accuracy is poor.

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