Comparison of effects of water temperature on photoacoustic signals produced through Mechanisms of Laser-induced liquid breakdown and thermal expansion

Acoustic impulses produced through the mechanism of the laser-induced liquid breakdown in water have been investigated in the range from 0℃ to room temperature. In contradistinction from the acoustic impulses produced via thermal expansion, the polarity and amplitude of acoustic impulse produced via liquid breakdown mechanism are unchanged with water temperature. This indirectly proves that the production of acousic impulse is due to the expansion of the cavity itself which includes plasma A semiempirical description of this phenomenon is given in this paper.