液体表面波及其谐波的光衍射效应

为了探究液体表面波的波动规律,提出了一种基于激光衍射的探测方法.未扩束的激光束直接斜入射到波动液面,液面波动的强度由电磁式激发器控制、频率由信号发生器控制,用CCD采集光衍射图样并传送到计算机中实时处理.根据波动光学理论,给出了衍射光场和液体表面波之间的解析关系,发现实验现象和理论分析吻合.实验结果表明:该方法具有实时、准确、无损的特点.

Light diffraction effect from liquid surface wave and its higher harmonic wave

A method of detecting liquid surface wave based on laser diffraction was proposed. A He-Ne laser beam was obliquely incident upon liquid surface wave directly, the wave intensity was controlled by an electromagnetic type exciter and the frequency of the liquid wave was controlled by a signal generator, the laser diffraction patterns from liquid surface waves were collected by a charge-coupled device. The dependence of the diffracted field on the surface waves was derived by theory of wave optics. The experiment result indicates that the proposed method has the advantages of high sensitivity, high speed and non-destructive.