【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.更多还原

【Abstract】 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 conversion,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.更多还原