Optical fiber temperature sensor demodulation method

Abstract

The invention relates to a new optical fiber temperature sensor demodulation method. The new optical fiber temperature sensor demodulation method can solve the problems that the environmental adaptability of an existing optical fiber temperature sensor system is poor, and factor changes such as the jitter of optical signals have great influence on the performance of the optical fiber temperature sensor system. The new optical fiber temperature sensor demodulation method is combined with an optical fiber Michelson interferometer and an optoelectronic oscillator to change the optical path difference of the interferometer through the change of temperature, thereby changing the center frequency of a microwave signal output by the optoelectronic oscillator and realizing the demodulation of an optical fiber temperature sensor. A temperature probe is simple in manufacturing, and temperature measurement can be achieved with ordinary single-mode optical fibers. An optical fiber temperature sensor demodulation system has the advantages of adjustable measurement sensitivity, high precision and simple measurement method.

Description

technical field [0001] The present invention is mainly applied in the field of temperature measurement, and in particular relates to a demodulation method of an optical fiber temperature sensor. Background technique [0002] In engineering applications and scientific research, temperature is a very important reference quantity and occupies a pivotal position. Traditional temperature sensors are mainly thermocouples, semiconductors and platinum alloys. Their measurement principles are simple and cost-effective, so in practice widely used in applications. Compared with the traditional temperature sensor, the optical fiber temperature sensor uses the spectrum absorbed by some substances to change with the change of temperature, and then analyzes the spectrum transmitted by the optical fiber to measure the temperature change in real time. It has higher measurement accuracy and real-time sensitivity. adjustable. [0003] At present, fiber optic temperature sensors mainly includ...

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Problems solved by technology

Because the optical fiber temperature sensor uses a temperature-sensitive material that matches the refractive index of the optical fiber to coat the surface of the optical fiber, the light can enter the other optical fiber from the reflection surface of one optical fiber. Influence, so that the refractive index changes, so that the output optical power is a function of temperature, so it can be used as a means to measure the change of temperature, but the common problem of optical fiber temperature sensor is poor adaptability to external environmental factors, jitter of optical signal, etc. The change of factors has a great influence on the performance of the sensor demodulation system

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