测量动光栅瞬时速度的有效方法  

Measuring the instantaneous velocity of a moving grating

作　　者：陈长鹏[1] 汪礼胜[1] 

机构地区：[1]武汉理工大学物理科学与技术系,湖北武汉430070

出　　处：《物理实验》2010年第7期1-4,共4页Physics Experimentation

基　　金：武汉理工大学自主创新研究基金资助(No.2010-1a-019)

摘　　要：激光束通过双光栅衍射,衍射光束重叠形成光拍,光拍信号通过硅光电池进行光电转换,得到的信号电流的频率等于多普勒频移.信号电流经I/V转换、反函数电路和微分及计算电路运算后,可以确定多普勒频移,从而确定动光栅的运动速度.测量了音叉在换能器的作用下做微振动时动光栅的瞬时速度.The photo-beat is presented to be obtained through overlapping of the diffraction beams which passed through a moving grating and a stationary one orderly. The frequency of photocurrent given by the transformation of silicon photocell is equivalent to the Doppler shift. After I/V conver- sion, inverse function transformation, differential and calculation circuits, the Doppler shift can be obtained. Then the time-dependent velocity of the moving grating can be given. In this experiment, the velocity of moving grating is also measured as the tuning fork is forced to micro-vibrate by a transducer.

关 键 词：瞬时速度 双光栅 多普勒频移 光电流 反函数运算电路 

分 类 号：O436.1[机械工程—光学工程]