Measurement of single bubble sonoluminescence 3: an improved light scattering experiment

摘要

A single bubble of air in water, while oscillating in the acoustic standing-wave field, can emit short light pulses regularly at the moment of collapse provided that the acoustic conditions are adequate. The dynamics of the bubble can be monitored by Mie-scattering measurements. In this report an optical system was devised to minimize stray light signals without any significant loss of the signals. As a result the background signal was reduced remarkably compared with our previous report. Telemicroscopic images were also monitored with front lighting and recorded by the video camera, allowing us to determine the maximum radius R{sub}(max). Since the detection angle was relatively large, the scattered light intensity was proportional to the square of the bubble radius, allowing us to determine time dependence of the bubble radius.