A Michelson-based fibre optic interferometer was used to make absolute measurements of the sub-nanometer liquid surface displacements created by the photoacoustic process. This measurement system is both broad-band and non-contacting. Photoacoustic waves, generated using pulses from a Nd: YAG laser operating at 1.06 µm, were measured in methanol, water, and various concentration mixtures. The wave amplitude demonstrated a quadratic relationship with concentration. © 1993.
|Number of pages||6|
|Publication status||Published - 15 Dec 1993|