摘要
介绍了光纤传感器在恶劣环境井下的应用。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—8000)PSi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±0.5nm,动态变化范围在10μm,并提及井下长期的测试结果。
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 system is developed for sensor fabrication.This system is also used as the signal demodulation system providing very high resolution.Experiment results show that the SCIIB system achieves 0.1% accuracy with a（0-8 000） psi working range for the pressure sensor and a（0—600） ℃ working range for the temperature sensor.The resolution of the white light system is about ± 0.5 nm with a dynamic range up to 10 micrometers.The long-term testing results in the oil site are also presented.
出处
《科学技术与工程》
2010年第31期7745-7749,共5页
Science Technology and Engineering
基金
十一五国家重大科技专项(2008ZX05024-004-013)资助
关键词
光纤传感器
温度传感器
压力传感器
井下
fiber optic sensor temperature sensor pressure sensor oil down hole
