PURPOSE: To perform highly accurate flaw inspection by arranging the contact surfaces of plural ultrasonic wave transmitters and detectors arranged to detect defects in a subject to be inspected with the subject in accordance with the shape variation of the inspecting surface.
CONSTITUTION: A multi type ultrasonic probe 4 arraying plural ultrasonic wave transmitters and detectors 3 in the circumferential direction of a bent tube to inspect the welding part 6 of a subject 1 to be inspected having the bent tube part and coupling these transmitters and detectors 3 with a rubber coupling part 5 is arranged on the external surface of the tube and a magnet 7 is laid under the contact surface of each ultrasonic wave transmitter and detector with the subject 1. When the ultrasonic probe 4 is scanned in the tube axial direction (y), said configuration enables each ultrasonic wave transmitter and detector 3 to freely move on the tube surface even if the surface is partially uneven, so that respective elements 3 trace the unevenness and the magnets 7 enables these elements 3 to stick closely to the uneven surface.
KINO HIROTOSHI
SASAKI SOUJI
