Simultaneous observation of motion and size of a sonoluminescing bubble

This paper describes a method of simultaneously executing both observations using a charge-coupled device (CCD) camera with stroboscopic light and measurement of bubble radius with light scattering. This optical system consists of a beam splitter inserted between a lens and the CCD camera, and a photomultiplier tube (PMT) mounted at the beam splitter. It is confirmed that this system is useful for the simultaneous observation of the bubble size, shape and translational motion.