Volume 16 (1995), Issue 2, Pages 63-73
Optoacoustic Detection of Microparticles in Liquids at Laser Fluences Below the Optical Breakdown Threshold
1General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow 117942, Russia
2N. N. Andreev Acoustics Institute, ul. Shvernika 4, Moscow 117036, Russia
Received 16 March 1994
Copyright © 1995 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
An optoacoustic device consisting of a XeCl excimer laser and a measurement cell with an attached piezotransducer was used for detecting microparticles suspended in liquid probes. The potential of optoacoustic diagnostics of microinhomogeneous liquids was enhanced by applying informative parameters of optoacoustic response. Probes of distilled water and Dow Chemical latex suspension were used in experiments. It was shown that cavitation mechanism of optoacoustic conversion taking place at laser fluences below the optical breakdown threshold was well-suited for individual microparticle detection. The approach proposed is different from the well-known breakdown counting optoacoustic technique.