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0引言机械振动的波形图,大多都是把机械振动转化为电信号,用示波器显示出来的。这种把机械振动转化为电信号的过程不能直接观察,不够直接具体,不便于理解;也有些利用激光显示的波形,功能比较单一,不利于学生真正理解振动和振动的叠加。本小组自制的这个机械振动光学演示仪可以直观、具体的观察到机械振动产生的波,包括简谐振动的正弦曲线、李萨如图形等。本仪器主要根据在相互垂直的分振动频率不同的情况下不能够形成稳定的图案,但如果分振动频率成整数比,则合振动的轨迹为稳定的曲线,曲线的花样和分振动的频率比、初相位有关,得出的图
0 Introduction Mechanical vibration waveforms, most of them are the mechanical vibration into electrical signals, with the oscilloscope displayed. This mechanical vibration into electrical signals can not be observed directly, not directly specific, not easy to understand; some use of laser waveform display, the function of a single, is not conducive to students really understand the superposition of vibration and vibration. This group of self-made mechanical vibration optical demo can be intuitive and specific observations of mechanical vibration generated waves, including simple harmonic sinusoidal vibration, such as Lissajous figures. The instrument is mainly based on the mutual vertical sub-vibration frequency can not form a stable pattern, but if the sub-vibration frequency into an integer ratio, the combined vibration trajectory for the stable curve, curve patterns and sub-vibration frequency ratio , The first phase of the relevant figure drawn