R. Briers et al., SURFACE-ROUGHNESS DETERMINATION USING THE ACOUSTOOPTIC TECHNIQUE - THEORY AND EXPERIMENT, Applied physics letters, 71(5), 1997, pp. 599-601
With the acousto-optic nondestructive testing technique, phase shifts
between the incident and the reflected ultrasound are measured at crit
ical angles of the investigated material. This letter is focusing theo
retically as well as experimentally on the influence of a small surfac
e roughness (some micrometers) of a thick material on the phase inform
ation. (C) 1997 American Institute of Physics.