旋光效应在微位移测量中的实验研究

微位移测量原理有许多种,利用偏振光的旋光效应是一种高效、简洁、精确的新方法.旋光效应是指单色线偏振光在沿光轴方向通过石英晶体时,透射出来的光的振动面会产生旋转的物理现象,其旋转角度与晶体厚度有关.用激光器、起偏器、石英晶体、千分尺等设计了一个微位移测试系统,测试表明:其测量精度能达到0.1 μm,测量范围可达300 μ...

Experimental study of the optical rotation effect in micro-displacement measurement

It is a new way of high efficient,simple and accurate method which uses the optical rotation effect of polarized light,though there are many kinds of principles of the micro-displacement measurement.The optical rotation effect is a physics phenomenon that the jar face of the transmission light can produce rotary,when the linearly polarized light pass the quartz crystal on its axle direction,its spin angle relates to crystal thickness.A micro-displacement measurement system which uses laser light,the linearly polarized light,quartz crystal and the micrometer is designed.Test result shows that its measurement precision can achieve 0.1 μm and its measurement range 300 μm,relative error is less than ±1 %,it can meet micro-displacement measurement demand of all kinds of instrumentation,and can be widely used in precise micro-displacement measurement system.