L. Rovati et al., OPTICAL INTERFEROMETER FOR GAS BUBBLE VIBRATION MEASUREMENTS WITH ANGSTROM SENSITIVITY, Review of scientific instruments, 64(6), 1993, pp. 1463-1467
An optical interferometer which measures the radial pulsations of gas
bubbles in liquids with Angstrom sensitivity is described. The gas-liq
uid interfaces act as mirrors. The interferometer, intrinsically diffe
rential, is insensitive to the overall movement of the bubble and to v
ibrations of the optical components. Examples of the resonance behavio
r of oxygen bubbles in water are given.