基于侧发光光纤对射耦合的光纤式液位测量  

Optical Fiber Liquid Level Measurement Based on Coupling of Side-emitting Optical Fiber

作　　者：赵呈锐[1] 叶林[1] 葛俊锋[1] 

机构地区：[1]华中科技大学控制科学与工程系,湖北武汉430074

出　　处：《仪表技术与传感器》2012年第8期74-77,共4页Instrument Technique and Sensor

摘　　要：介绍了一种基于菲涅尔定律的光纤式液位测量方法,该方法利用介质折射率对双光纤之间光耦合效率的影响,使用两根并行排列的侧发光光纤作为测量元件,实现了对燃油液位的本质安全测量。通过理论分析得到了传感器的液位响应公式,进行传感器样机设计予以验证,在0.1～1 m范围内输出电压曲线变化趋势符合理论分析结果。A new optical fiber liquid level measurement based on Fresnel Equation was introduced.It consisted of two parallel side-emitting optical fibers closing to each other,and measured the variation of optical power coupling between the fibers,which was affected by the refractive index of medium in the gap.Theoretical output of the sensor was predicted by analyzing the coupling efficiency of the light.A prototype of sensor was realized,and the experimental result shows accordance to theoretical output is from 0.1m to 1 m.

关 键 词：液位传感器 侧发光光纤 光纤传感器 光泄漏 光耦合 

分 类 号：TP21[自动化与计算机技术—检测技术与自动化装置]