氧量含量的光纤检测方法研究

Research on Measurement of Oxygen Gas Densityby Fiberoptic Sensing Method

借助于磁场中氧气具有顺磁性、氮气具有抗磁性的物理性质，设计了由４个磁极和一个充有氮气的玻璃哑铃球构成的装置。该装置中部装有一平面反射镜，当环境氧气量的含量变化时，可以引起作用在哑铃球上磁场力发生变化，从而导致反射镜发生偏转。反射镜的微小转角由光纤传感器测出，该转角正比于磁场中的氧量含量，通过测量该转角，实现了相关氧量含量的检测。

Based on the property that oxygen gas is paramagnetic substance and nitrogen gas isdiamagnetic substance, a fiber-optic oxygen gas density sensing system has been designed, which consists ofa nitrogen gas filled glass ball dumbbell and 4 magnet pole pieces. A reflective mirror is fixed on thecenter of the dumbbell and the dumbbell system is hung by an elastic steel strip. As the environmental oxy-gen gas density changes, the dumbbell and the reflective mirror will be rotated a small angle caused bythe changing of the magnet force. The small angle is proportional to the oxygen gas density and measured by the three fiber optic sensing probe. In this way, the oxygen gas density can be obtained.