基于光透射特性的磁流体传感器研究

Research on magnetic fluid sensor based on optical transmission properties

研究了磁流体传感器在无磁场和有磁场情况下光透射特性的变化情况。施加磁场后,透射光功率与入射光功率之间呈非线性关系,且在不同磁场强度下透射光功率随入射光功率增大的过程中均在某一区间突然大幅增大。突然增大的区间具有最高的灵敏度,区间范围与磁流体传感器的薄膜厚度及入射光功率有关。

The changes of optical transmission properties of magnetic fluid sensors in the presence and ab- sence of magnetic field are studied. When the magnetic field is applied, there is a non-linear relationship be- tween the transmitted optical power and the incident optical power. When the different magnetic field intensity is applied, the transmitted optical power increases abruptly in a certain range with the increase of the incident optical power. The range of the sudden increase has the highest sensitivity, and the range is related to the thickness of the magnetic fluid film and the incident optical power.