用于高温高压井下的光纤传感器

本文详细介绍了光纤传感器在恶劣环境的井下的应用。传感头部分是基于干涉原理的光纤传感器，它的腔体长度会随着压力和温度发生变化。为了提高测量速度，一种以自校正（SCIIB）原理为基础的干涉方法被应用到压力（或温度）信号的解调，这种方式能够针对白光漂移以及光纤损失的变化实现补偿。这种系统应用到传感器的制作当中，解调系统可以提供非常高的分辨率。实验结果显示，当压力传感器在0~8000psi范围内工作，温度传感器在0~600℃范围工作时，这种SCIIB系统能够达到0.1%的准确度。白光系统的分辨率大约在?.5nm，动态变化范围在10微米。井下长期的测试结果在文中也有提及。

Fiber optic pressure and temperature sensors for oil down hole application

Detailed studies on fiber optic pressure and temperature sensors for oil down-hole applications are described.The sensor head is an interferometric based fiber optic senor in which the air-gap will change with the pressure or temperature.For high-speed applications,a novel self-calibrating interferometric/intensity-based(SCIIB) scheme,which realizes compensations for both the light source drift and the fiber loss variation,was used to demodulate the pressure(or temperature) signals.An improved white light s...