Multi-temperature zone calibration method based on internal hollow type temperature control member

Abstract

The invention discloses a multi-temperature zone calibration method based on an internal hollow type temperature control member. A multi-segment broken line relationship of temperatures varying along with the light intensity ratio of anti-Stokes to Stokes is obtained by utilizing a segmentation calibration manner while adopting an internal hollow type copper cylinder as the main body of a temperature control system, so that a temperature calibration curve infinitely approaches an index changing curve of the light intensity ratio of anti-Stokes to Stokes and the temperature. Under the precondition that the method does not influence the system performance, the temperature measurement accuracy of a system is further improved, the applicable temperature measurement range of the system is extended, and the defects and disadvantages of an existing temperature calibration manner are better overcome.

Description

technical field [0001] The invention relates to a distributed optical fiber temperature measurement technology, in particular to a multi-temperature zone temperature automatic calibration method for distributed optical fiber temperature sensing. Background technique [0002] The distributed optical fiber temperature measurement system is mainly used in temperature monitoring and fire detection in large spaces, such as electric power, railways, highway tunnels, cable trenches, warehouses, oil fields, oil pipelines and other places, for the safe operation of equipment places and personnel life and property Security plays an important role. [0003] The distributed optical fiber temperature measurement system is mainly composed of temperature sensing optical cable, temperature calibration module, data acquisition module, data processing module and graphic display module. The temperature calibration module is an important part of the temperature sensing system. The advantages an...

AI Technical Summary

Problems solved by technology

[0005] The temperature calibration method of this method is relatively simple, but there are serious defects and deficiencies: First, because there is a certain gradient in the temperature field in the insulation box, it is difficult to ensure uniform temperature, and it is difficult for the single reference temperature collected at one time to fully reflect the reference optical fiber temperature. In the temperature field, due to the inaccuracy of the reference, the accuracy of the temperature measurement is reduced; secondly, because the light intensity ratio (abbreviation) of Anti-Stokes and Stokes and the temperature change exponentially, dynamic temperature calibration The linear fitting method using a single fitting coefficient in the entire temperature range has poor linearity in the high temperature and low temperature areas, and cannot guarantee the temperature measurement accuracy in the entire temperature range. Only the single temperature zone method is used for temperature calibration. , its calibration accuracy is poor, thus reducing the temperature measurement accuracy of the entire temperature sensing system

Images