具有参考信号的反射式光纤液位传感器

描述了一种具有参考信号的反射式光纤液位传感器，它是利用光纤的输光反射原理测量液痊。一根光纤将一束光投射到油面，另一根光纤接收从油面反射回的光，再用一根参考光纤沿着与发送、接收光纤同样的路径传输由发光二极管ＬＥＤ发出的光。再通过反射信号与参考信号的比值运算，有效消除了由于非测量的光强度变化造成的干扰。该液位传感器的测量距离范围是７０ｍｍ～１７０ｍｍ，精度可达１％。

Light-RefleCtion Liquid-Level Sensor with Optical Fibers

A light-reflection liquid,level sensor with optical fibers isdescribed, which is based on the fiber input-light reflection principle.A Light is projected onto an oil surface through a transmitting fibedA receiving fiber picks up the light from the oil surface. A referencefiber transmits the light from a light-emitting diode back and forth along the same path as that of the transmitting fiber and the receivingfibed Division is accomplished by using the reflected signal and thereference signal, so it effectively eliminates apparent distance variations that are due to the variations in light intensity. The diStancerange is from 70mm to 170mm, the precision is 1 Percent.