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.