LASOR ULTRASONIC INSPECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To cleanly ensure an optical path for transmitting and receiving ultrasonic waves under an inspection environment such as underwater environment, dusty environment or the like. SOLUTION: This device comprises substituting means 18, 19 and 20 for substituting at least one of optical paths for guiding a first laser beam PL and second laser beam IL to the surface of a material to be inspected 3 by a fluid easily transmitting the wavelength of a first laser beam source 1 and the wavelength of a second laser beam source 4.