Temperature simple calibrating method suitable for reflection-type polarization-preserving fiber temperature sensor

Abstract

The invention discloses a simple temperature calibration method suitable for a reflective polarization maintaining optical fiber temperature sensor. Before calibrating the reflective polarization maintaining optical fiber temperature sensor, a digital voltmeter is connected in series between a photoelectric detector and a signal detection circuit , A standard thermometer is set in the field environment, and information exchange is realized between the computer, the digital voltmeter and the standard thermometer through the acquisition card. The calibrated reflective polarization-maintaining optical fiber temperature sensor obtains a more universal temperature nonlinear quintic polynomial fitting model after calibration, that is, T0=A0″+A1″×V1+A2″×V12+A3″× V13+A4″×V14+A5″×V15. The calibration method of the present invention not only maintains the calibration accuracy of the original technology, but also reduces the calibration workload, and the entire sensor can be calibrated only by measuring the temperature at a certain moment, which satisfies the long-term temperature monitoring of the sensor under complex conditions on the construction site. performance requirements.

Description

technical field [0001] The invention relates to a temperature calibration method of an optical fiber temperature sensor, more particularly, a calibration method suitable for a reflective polarization-maintaining optical fiber temperature sensor that can be easily operated at an industrial site. Background technique [0002] The calibration of the temperature sensor, the key component of the temperature measuring equipment, is an important link to ensure the accuracy of the equipment. The accuracy of the calibration results and the stability of the algorithm directly affect the accuracy of the results produced by the temperature sensor. Therefore, the calibration of the temperature sensor is a prerequisite for the follow-up work. [0003] At present, the reflective polarization-maintaining optical fiber temperature sensor has good static accuracy and dynamic performance, which can meet the technical indicators of the equipment, but the temperature sensor will change when the...

AI Technical Summary

Problems solved by technology

[0006] 1. Data acquisition is cumbersome and time-consuming, and a large amount of data needs to be measured

[0007] 2. The process of calculating the calibration parameters is cumbersome: to calculate the calibration parameters, a large amount of data needs to be entered into the computer first, and then the data curve is fitted, and the processing process is complicated

[0008] 3. The calibration quality cannot be evaluated on the calibration site: since the calibration process and parameter calculation are carried out separately, the calibration quality can only be evaluated during the error analysis process of the calibration parameters

[0009] 4. The use of calibration parameters is inconvenient: the calibration parameters are used to compensate the actual measurement data of the equipment

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