摘要
理论分析和数值模拟计算了不同温度和不同体积密度下磁性液体的折射系数和消光系数,以及浸没住磁性液体中光纤端面处的反射率,得到了,体积密度和外加磁场强度对磁性液体的折射系数和消光系数的作用比较大.而温度对折射系数和消光系数的影响不大。实验制作了光纤端面浸没在磁性液体中的传感元件,设计了测量光路系统,得到了反射率随外加磁场强度变化的情况,与理论分析结果相吻合。由理论和实验可知,磁性液体的消光系数不仅跟体积密度和温度有关,还与外加磁场强度有关,对光纤端面处的反射率有一定的影响。
The refractive coefficient and extinction coefficient of ferrofluids, and the reflectivity on the fiber-optic end face in ferrofluids versus external magnetic field intensity at different volume concentrations and temperatures were theoretically analyzed and numerically simulated. The results show that volume concentration and magnetic field intensity have a great impact on refractive coefficients and extinction coefficionts of ferrofluids. The sensing heads based on the reflection on the fiber-optic end face in ferrofluids were fabricated, and the optical measurement system was designed, so the relationship between reflectivity and magnetic field intensity was obtained. The experimental results agree with the theoretical analysis. By theory and experiment, the effect of extinction coefficient of ferrofluids on the reflectivity on the fiber-optic end face can not be neglected.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2009年第6期1482-1486,共5页
Acta Optica Sinica
基金
浙江省科技厅科研工业项目(2007C21025)
宁波市自然基金(2008A610064)资助课题
关键词
导波光学
传感技术
磁性液体
消光系数
guided wave optics
transducer technique
ferrofluid
extinction coefficient
