Test stand for determining the directivity patterns of ultrasonic probes

Test stands for recording directivity patterns of ultrasonic probes are described. Stands contain a standard sample in the form of a half-disk made of fine-grained metal with a radius of 100-120 mm, and a thickness of 60 mm. A procedure is given to record longitudinal- and transverse-wave directivity patterns while observing the necessary scale of the displacement amplitude. Electromagnetic-acoustic (EMA) transducers are incorporated as measurement probes, which consist of a high-frequency inductor and a samarian-cobalt permanent magnet. It is found that the EMA probes can record directivity patterns of various ultrasonic probes in longitudinal and transverse modes at equal scales, and the procedure for estimating the degree of localization can be applied to test stand designs for recording directivity patterns