Abstract

In this work measurements of the acoustic attenuation coefficient for water in the frequency range of 20–40 Mhz have been performed. These measurements have been conducted with a photoacoustic setup, containing a nano second pulse laser and an integrating line detector. The nanosecond pulse laser is used to generate ultra sound waves in a target. Those waves are transmitted into water and are then detected by the line sensor. In this way the resulting ultra sound field was scanned and the absorption coefficient was evaluated. Different pulse energies, beam diameters and target materials were used. The resulting coefficients are in the range of the reported values found in literature.

© 2009 OSA/SPIE