Electromagnetic ultrasonic transducer

Abstract

Abstract PURPOSE:To increase a magnetic field component in a vertical direction, by a method wherein a plurality of magnetic pairs combined so as to become reverse in a magnetizing direction to each other are arranged so that the magnetizing direction becomes the same between adjacent magnetic pairs and a rectangular coil is mounted on each magnet pair. CONSTITUTION:A pair of magnets 11a, 11b are arranged through a spacer 14 so as to become reverse in a magnetizing direction to each other. A plurality of the magnetic pairs are arranged and fixed to a support plate 15 so that the magnetizing direction becomes the same between adjacent magnet pairs. Rectangular coils 21, 22, 23 are bent into a C-shape to be mounted on each magnet pair so as to cover the magnetic pole surfaces thereof. When a pulse like exciting current is supplied to the coils 21, 22, 23 so as to be successively shifted in a phase, the synthetic wave front W of the SH vibration wave generated in a body to be inspected by each coil advances obliquely. Since the magnetic field component in the direction vertical to the end surface of each magnet is sufficiently large, even when the gap between it and the body to be inspected is large, the lowering in sensitivity is suppressed to a lower level.

Inventors

• 👤 Kazuo Morimoto
• 👤 森本　一夫
• 👤 Shuji Tanioka
• 👤 谷岡　修二

Bibliographic Details