Pitch and catch ultrasonic appts. - has transmitter and receiver probes to detect faults and intermediate probe measuring spurious reflections

摘要

A carrier frame (14) is mounted by means of feet (15) on the outer surface (12) of the wall (11) of a container to be tested. Attached to the frame is a first ultrasonic probe (16) which serves as a transmitter and a second probe (17) which serves as a receiver. The frame also carries position and angle adjusting devices (16A, 17a). A third ultrasonic probe (18) is mounted between the first two. Liquid couplers of known types (16B, 17B, 18B) are employed. The outer probes are used for known pitch-and-catch measuring methods whilst the intermediate probe serves for precise location of spurious reflections.