摘要
介绍了研究分布式光纤温度传感器的意义和基于背向拉曼散射的分布式光纤温度传感器的原理、系统组成，并给出了该系统的技术关键，这包括：依据对激光器输出光波长的优化选择和对光电转换用雪崩光电二极管雪崩增益的优化设计，提高系统的信噪比；通过超高速A／D计算机插件的研制，实现微弱信号的数字平均，取代了常规的Boxcar积分器；将普通通讯光纤和包层涂锌特种光纤相结合作传感光纤，将测温上限提高到260℃。所研制的分布式光纤温度传感器的技术指标为：测量精度7℃，测量时间160s，测量空间分辨率15．6m，测量距离1．5km，测温范围30℃～260℃。
In this paper the principle and components of a distributed optical fiber temperature sensor based on spontaneous Raman scattering are described. Some key techniques are given, which include the determination of optimum wavelength of the laser and avalanche gain of avalanche photodiode (APD), the development of the A/D convert card with high conversion speed and the stable voltage source for APD, the combination of common fiber and zinc-jacketed fiber for extending the sensing range. A prototype of the sensing system has been developed. It has the temperature resolution of 7℃, measuring time of 160s, spatial resolution of 15. 6m (limited by pulse width of laser), sensing distance of 1. 5km, measuring range of 30℃～260℃.
出处
《激光与红外》
CAS
CSCD
北大核心
1997年第5期309-312,共4页
Laser & Infrared
关键词
光纤传感器
激光二极管
信噪比
温度测量
optical fiber temperature sensor, laser diode, signal to noise ratio, amplifier
