摘要
针对高温油井测量环境对基于光纤非本征法-珀干涉仪(EFPI)的温度和压力传感器性能的要求,采用了微型光谱仪测量干涉光谱和相关计算的波长解调方法,使EFPI腔长绝对分辨率达到0.25nm,相应传感器的温度和压力相对测量分辨率达到0.02%;利用双LED光源交替工作,实现温度和压力同时测量;对EFPI传感器结构进行了优化设计,降低了传感器的温度-压力交叉敏感性,在0～20MPa的压力变化范围内,对温度测量的影响小于0.2%,在20～300℃温度变化范围内,对压力测量的影响小于1%,满足高温采油井井下测量的要求.
To meet the need of the temperature and pressure measurement in high temperature oil wells, an EFPI （Extrinsic Fabry-Perot Interferometric） based fiber-optic temperature/pressure sensor has been developed. The interference spectrum reflected from EFPI sensor head is measured with a miniature spectrometer and demodulated with a cross correlation algorithm. A cavity length resolution of 0. 25nm, corresponding to the pressure resolution of 0. 02 % has been achieved. The temperature-pressure cross sensitivity is decreased through the structure and material optimization of the EFPI sensor head. For temperature measurement, the pressure interference is less than 0. 2% in the pressure variation range from 0 to 20 MPa, and for pressure measurement, the temperature influence is less than 1% in the temperature variation range from 20 to 300℃. This sensor system is specially suitable for the down-hole measurement and other harsh environment application.
出处
《传感技术学报》
CAS
CSCD
北大核心
2006年第6期2450-2452,共3页
Chinese Journal of Sensors and Actuators
基金
辽宁省科学技术基金资助(20042164)
国家自然科学基金海外青年合作基金资助(60028505)
关键词
光纤传感器
高温高压测量
温度-压力交叉敏感性
油井下测量应用
fiber optic sensor
high temperature and pressure environment
temperature-pressure cross sensitivity
oil well application
