摘要
针对单光源光谱吸收法检测甲烷气体体积分数存在很多测量误差现状,本文首先分析了用发光二极管(LED)做光源时驱动电流抖动造成的测量误差,提出了补偿此电流抖动误差以及测量环境背景光干扰误差的双波长测量方法,简述了其测量原理,重点针对双波长方法从理论上推导了其测量误差通用公式,在此基础上分析井数值模拟了温度变化导致的测量误差,给出了减小双波长温度测量误差建议。研究结果对于其他强度调制型光纤传感器具有普遍的适用价值。
For many error factors of CH4 gas sensing system using absorption type optical fiber, LED source driving current error is studied and discussed first. In order to eliminate the current error, zero shift of photoelectric on the precision and environment light disturbing-error, two-wavelength CH4 absorption fiber sensor is presented in the paper. Its sensing theory is summarized, then its general measuring error formulation is deduced. Using the formulation, the most important error of this type of sensor caused by the temperature fluctuation of light source power is numerically discussed as illustrative example. The results can be applied to other light intensity modulated sensor.
出处
《光电子技术与信息》
CAS
2003年第6期27-30,共4页
Optoelectronic Technology & Information
关键词
甲烷
驱动电流
温度误差
methane
driving current
temperature error
