モノリシック構造二次元アレイトランスデューサとデータ収集用マイクロコンピュータを用いる実時間超音波受波装置

抄録

This paper describes the spatial response of a monolithic array transducer and a trial real-time ultrasonic receiving system made by combining such a transducer with an electronical data acquisition system. It is concluded from the experiment that the point spread function is mainly contributed by the diffusely-propagating longitudinal waves rather than the resonant plate waves and the location of maximum intensity corresponding to the oblique incidence is only shifted very little from that obeying Snell's law. The latter is due to the directivity of the receiving response, depending on the electrode width of the transducer. In the trial receiving system, described here the data sampling technique with a variable speed decreased the influence of electronical switching spikes for data selection to a remarkable extent. In the special case of slow sampling, the displayed picture is slower than the actual movement but follows its movement without flickering.