公开(公告)号：US4348903A

公开(公告)日：1982-09-14

申请号：US180043

申请日：1980-08-21

申请人： Ichiya Sato ,  Kazuo Miyagawa ,  Yukito Sasaki ,  Koji Kawamura ,  Shuichi Sato ,  Soji Sasaki ,  Jun Kubota ,  Susumu Itoh

发明人： Ichiya Sato ,  Kazuo Miyagawa ,  Yukito Sasaki ,  Koji Kawamura ,  Shuichi Sato ,  Soji Sasaki ,  Jun Kubota ,  Susumu Itoh

IPC分类号： G01N29/04 ,  G01N29/24 ,  G10K15/04 ,  G01N29/00

CPC分类号： G01N29/2412 ,  G10K15/04 ,  G01N2291/02854 ,  G01N2291/0421

摘要： First and second magnetic poles are provided, which have end surfaces brought close and in opposition to a material to be examined. These magnetic poles are magnetized by a DC exciter coil such that the magnetic poles have opposite polarities. The first magnetic pole is provided at its end surface with a pair of cumulatively connected transmitting coils, and the second magnetic pole is provided at its end surface with a pair of differentially connected receiving coils. The transmitting coils are connected to a pulser which generates a pulse current, and the receiving coils are connected to a differential amplifier. An electromagnetic ultrasonic wave generated by the transmitting coils are received by the receiving coils, amplified by the differential amplifier, and thereafter supplied to a synchroscope and an automatic detector.

摘要翻译： 提供了第一和第二磁极，其具有与被检查材料接近并相对的端面。 这些磁极被直流励磁线圈磁化，使得磁极具有相反的极性。 第一磁极在其端面处设置有一对累积连接的传输线圈，并且第二磁极在其端面设置有一对差分连接的接收线圈。 发送线圈连接到产生脉冲电流的脉冲发生器，并且接收线圈连接到差分放大器。 由发送线圈产生的电磁超声波由接收线圈接收，由差分放大器放大，然后供给同步机和自动检测器。