对称结构的半导体式光纤温度传感器

Optic-fiber Temperature Sensor with Symmetrical Structure Based on Semiconductor Optical-absorption

基于半导体吸收的光纤温度传感器具有电绝缘好、抗电磁干扰、无火花、能在易燃易爆的环境下使用等优点，非常适合组建电力设备、石油井下等环境下的温度监测系统，但它目前仍存在测量精度低、稳定性差等问题。提出了一种对称结构的半导体式温度传感系统的设计方案，详细分析了测温原理和系统结构，并构建了实验平台，进行了实验。实验表明：该系统在263～419K的温度范围内有1K的测量精确度和0．1K的分辨率，以及良好的线性度和反应时间，有效消除了光源和光探测器性能的不稳定和光纤耦合效率变动对测量精度的影响，提高系统的测量精度和稳定性。

The optic-fiber temperature sensor based on semiconductor optical-absorption has many advantages over conventional sensots, especially used in temperature supervising system of electric equipment. Consider of the problem of low accuracy and low stability, an optic-fiber temperature senor with a novel symmetrical structure was proposed and the basic principle of this system and its compensating measures were analyzed. The system for experiment is built. The experimental results show that the sensor has accuracy of 1 K and resolution capacity of 0.1 K over a temperature range of from 263 K to 419 K, good linearity and short response time, because most of influence which brought by light sources, detectors and fiber have been eliminate.