Patent ID: 7210355

Claim:
A supersonic sensor head for a supersonic non-destructive test apparatus for measuring shapes of supersonic waves transmitted in a test object, comprising: a supersonic vibrator for transmitting and receiving supersonic waves; a tube-shaped holder having a base end and an opening end, the holder being coaxial with the supersonic vibrator so that the base end of the holder is in contact with a free end of the supersonic vibrator; and a contact medium made of a soft gel material provided between the supersonic vibrator and the test object, so that the supersonic vibrator indirectly contacts the test object, the contact medium having a basal part and a contact part, and being contained in the holder, the basal part contacting the free end of the supersonic vibrator and the contact part protruding from the opening end of the holder, a pressure applied between the contact part of the contact medium and the test object urging the free end of the supersonic vibrator to closely contact the basal part of the contact medium, and the contact part of the contact medium to closely contact the test object, wherein the tube-shaped holder has a diameter converging mechanism for regulating the inner diameter of the tube-shaped holder at the opening end thereof.