公开(公告)号：US4102207A

公开(公告)日：1978-07-25

申请号：US751240

申请日：1976-12-16

申请人： Harold M. Frost ,  Thomas L. Szabo

发明人： Harold M. Frost ,  Thomas L. Szabo

IPC分类号： B06B1/04 ,  G01N29/24 ,  G01N29/00

CPC分类号： G01N29/2412 ,  B06B1/04 ,  G01N2291/0423 ,  G01N2291/0426 ,  G01N2291/0427

摘要： A handheld, compact, self-contained transducer unit for electromagnetic generation and detection of ultrasound on or in metals and other media is realized by mounting short, flat cable sections directly on a small, powerful permanent magnet. The cable sections are interconnected in an electromagnetic transducer circuit configuration and the plane of the flat cable transducer circuit structure is perpendicular to the magnet magnetization axis. Fabrication of the device can be accomplished by selectively connecting the conductor ends of a flat strip electrical conductor segment and affixing the conductor segment to an appropriate surface of a samarium-cobalt permanent magnet.

摘要翻译： 通过将短而扁平的电缆部分直接安装在小型，强大的永磁体上，实现手持式，紧凑，独立的传感器单元，用于在金属和其他介质上或金属和其他介质中进行超声波的电磁生成和检测。 电缆部分以电磁换能器电路结构互连，扁平电缆传感器电路结构的平面垂直于磁体磁化轴。 可以通过选择性地连接平板电导体段的导体端并将导体段固定在钐 - 钴永磁体的适当表面上来实现器件的制造。

公开(公告)号：US4126047A

公开(公告)日：1978-11-21

申请号：US790774

申请日：1977-04-25

申请人： James C. Sethares ,  Harold M. Frost

发明人： James C. Sethares ,  Harold M. Frost

IPC分类号： F02P7/067 ,  G01D5/12 ,  G01P3/44

CPC分类号： G01P3/44 ,  F02P7/067 ,  G01D5/12

摘要： Extremely sensitive velocity and position measurements are achieved with a surface acoustic wave (SAW) resonator device. A surface acoustic standing wave field is established on a movable SAW propagation surface by means of induced SAW pulses traveling on the propagation surface and their reflection from a SAW reflecting mechanism. Movement of the propagation surface causes periodic variations in the standing wave field amplitude. The frequency of the standing wave field amplitude variation is directly related to the SAW propagation surface velocity and its phase (i.e., total number of standing wave field amplitude variations from a reference point) indicates the SAW propagation surface position or how far it has moved from the reference point.One implementation comprises a rotatable aluminum cylinder on the surface of which SAWs are launched and detected by proximate but non-contacting transmitting and receiving electromagnetic transducers (EMTs). The reflecting mechanism used to initiate the standing wave results from the proximity of the EMTs and the coupling effect of the EMT magnetic fields. Frequency and phase information is extracted from the receiving transducer output by visually (CRT) or electronically counting standing wave amplitude variation cycles.Other implementation includes translatory planar SAW propagating surfaces and various transducer configurations and arrangements.

摘要翻译： 使用表面声波（SAW）谐振器装置实现非常敏感的速度和位置测量。 通过在传播表面上传播的感应SAW脉冲及其来自SAW反射机构的反射，在可移动的SAW传播表面上建立表面声驻波。 传播表面的移动导致驻波场振幅的周期性变化。 驻波振幅变化的频率与SAW传播表面速度及其相位（即，从参考点的驻波场幅度变化的总数）直接相关，表示SAW传播表面位置或其移动距离 参考点。

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。