Laser and sound

These pictures are samples of laser light reflected off a water surface subjected to sound reflected to the back of a semitransparent screen. The set up was a laudspeaker with a thin plastic sheet with a small pool of water in the middle (with added blue ink). The loudspeaker was driven by a tone generator with frequency and amplitude controls. Intended for an exhibition at "Galleri Hellsing" in 1974 but Chris closed down the gallery before.

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