Abstract: A dual element time-of-flight diffraction (TOFD) transducer assembly (10) for use in detecting an anomaly (78) in a test piece (70), the transducer assembly (10) comprising: a first transducer element (35) a configured to transmit ultrasonic signals (85a) to the test piece (70), and a second transducer element (35b) configured to receive diffracted ultrasonic signals (85b) from the test piece, wherein the first and second transducer elements (35a, 35b) are housed within a common housing (15), the housing (15) also forming part of the transducer assembly (10).

Abstract: A transducer assembly for use in determining a health state of a joint (45) between first and second joined parts (42, 44); the transducer assembly comprising a transducer module (50) comprising a transducer element (100) for transmitting or receiving an ultrasonic signal to or from, respectively, the joint, and a mounting part (52) comprising an internal wedge portion (70), formed integrally with the mounting part (52), to which the transducer element (100) is fixed permanently so that the transducer module forms a unitary replaceable module.