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

Abstract

The invention discloses a simple temperature calibrating method for a reflective polarization-maintaining optical fiber temperature sensor. Before calibrating the reflective polarization-maintaining optical fiber temperature sensor, a digital voltmeter is connected between an opto-electrical detector and a signal detecting circuit in series and a standard thermometer is arranged in the in-site environment; a collection card is adopted to realize information interaction between a computer and the digital voltmeter as well as the standard thermometer. The calibrated reflective polarization-maintaining optical fiber temperature sensor acquires a calibrated temperature nonlinear five times multi-item fitting model, namely T0=A0''+A1''*V1+A2''*V1<2>+A3''*V1<3>+A4''*V1<4>+A5''*V1<5>. The calibrating method of the invention not only maintains the calibrating precision of the prior art, but also reduces calibrating workload, namely, the whole sensor can be calibrated only by measuring temperature in a certain moment, therefore, the invention meets the requirement of long-term temperature monitoring for performance of the sensor under the complex condition of the construction site.

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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