【摘要】 利用双圆盘光栅动静结合的方式设计了激光多普勒音乐盒演示仪器.将双光栅放在激光源与光信号转换器之间,按下琴键,改变旋转光栅的运动速度,动静光栅发生光的多普勒效应.经信号转换器使该信号变为电信号,使用单片机进行频率的采集及运算处理,最终通过扬声器播放出乐音.更多还原

【Abstract】 The music box based on laser Doppler effect was designed by means of dynamic and static combination of double-disk gratings.The double gratings were placed between the laser source and the optical signal converter.The key was pressed to change the moving speed of the rotating grating so that both the dynamic and the static grating formed a light beat,i.e.,the Doppler effect of the light occured.And the signal converter turned it into an electrical signal.A musical tone through a speaker could be transmitted finally by using a single-chip microcomputer for frequency acquisition and arithmetic processing.更多还原