公开(公告)号：US4380931A

公开(公告)日：1983-04-26

申请号：US256750

申请日：1981-04-23

申请人： Harold M. Frost ,  James H. Prout ,  Robert W. Reed

发明人： Harold M. Frost ,  James H. Prout ,  Robert W. Reed

IPC分类号： G01N29/22 ,  G01N29/24 ,  G01N29/04

CPC分类号： G01N29/2412 ,  G01N29/222 ,  G01N2291/0421

摘要： An apparatus and method for quantitative nondestructive testing (NDT) of a wire wherein noncontacting ultrasonics is used. A transmitter-transducer coil is held in close proximity of a test wire or tube and high amplitude electrical current pulses are passed in the coil. A magnetic field perpendicular to the longitudinal axis of the wire is applied in the region. As a result of the electrical current pulses in the transducer coil, eddy currents are produced on the surface of the test wire. As a result of the magnetic field applied in the region, these eddy currents lead to Lorentz forces in the wire, which in turn generate corresponding torsional waves in the test wire. These waves speed down the wire and are received by a reciprocal transduction process, by means of a receiver-transducer. The velocity and attenuation measurements of the torsional waves along the axis of the test wire are made precisely and accurately via multiple-transducer setups. The data are interpreted in terms of the material conditions including mechanical defects or flaws in the test wire.

摘要翻译： 一种使用非接触式超声波的线材的定量无损检测（NDT）的装置和方法。 发射机 - 换能器线圈被保持在测试线或管的附近，并且高振幅的电流脉冲通过线圈。 在该区域中施加垂直于线纵轴的磁场。 由于换能器线圈中的电流脉冲，在测试线的表面产生涡流。 由于在该区域中施加的磁场的结果，这些涡流导致线中的洛伦兹力，这反过来又在测试线中产生相应的扭转波。 这些波浪通过接收器 - 换能器通过互逆转换过程来减速线路并被接收。 通过多传感器设置精确准确地测量沿测试线轴线的扭转波的速度和衰减测量值。 数据根据材料条件进行解释，包括机械缺陷或测试线中的缺陷。