Abstract: An optical scanner to inspect the surface of an object. A laser beam source mits a beam which is reduced in cross section, for mode matching, and caused to rotate by a series of lenses. A collimating lens focuses the rotating beam into a fiber optic cable. The beam, upon emergence from the cable, is reflected to the surface to be scanned by a reflecting cone. A detector, coupled to sensing devices, receives and interprets the surface reflections. The head portion of the cable is mounted in a crawler having a bellows at its mid-portion which enables the device to travel in a curved path, if necessary.