非功能式光纤传感器设计基础（三）补偿技术及其机理分析

在非功能式强度型光纤传感器中，造成光强变化而导致较大信号误差的主要原因有如下几个方面：（１）光源输出光功率的变化；（２）光路损耗变化；（３）无源器件耦合系数的变化；（４）调制器的光学特性变化；（５）光探测器灵敏度的变化；（６）光纤探头机械特性参数的变化。针对上述各种不稳定因素，分别讨论了相应的实用补偿技术和方法，并对这些补偿机理给出简略的分析。

Compensation techniques and its mechanism analysis

For the non-function intensity type fiber optic sensors,the main intensity errors are caused by the variation of (1)source device output optical power; (2)losses in the fiber line, (3)passive device coupling parameters; (4)optical properties of modulator; (5)photodetector sensitivity and (6)fiber optic probe mechanical feature parameters In this lecture, we have discussed a series of practice compensation methods and techniques which can overcome unstable factors mentioned above. In addition. some of these compensating mechanism are analyzed briefly.