A Transparent plate is mounted  (via magnets) to three loud peakers serial-connected to an amplifier delivering a sinus signal.

Silicon oil ( with viscosuity 20 Cst)  is put on the transparent plate.

A  point source light is collimated, goes through the oil

A mirror placed below redirects the light beam to tha camera.

NB : it is not easy to set up this light system : the light source muste precisely tuned at the focal point of the lens.