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21. 发明授权

US5499540A Electromagnetic acoustic transducer for bolt tension and load measurement 失效
标题翻译：用于螺栓张力和负载测量的电磁换能器
公开(公告)号：US5499540A
公开(公告)日：1996-03-19
申请号：US196917
申请日：1994-02-15
申请人： Hubert L. Whaley , Thomas Powers , Daniel T. MacLauchlan
发明人： Hubert L. Whaley , Thomas Powers , Daniel T. MacLauchlan
IPC分类号： G01L5/00 , F16B31/02 , G01L1/25 , G01L5/24 , G01N29/04 , G01N29/24
CPC分类号： G01N29/2412 , G01L1/25 , G01L5/246 , G01N29/045 , F16B2031/022 , G01N2291/011 , G01N2291/015 , G01N2291/02827 , G01N2291/0423 , G01N2291/101 , G01N2291/2691
摘要： A device for measuring a load on a part such as a bolt, comprises a socket having walls defining an interior space wherein the socket engages the bolt for transmitting a load to the bolt. An electromagnetic acoustic transducer comprising a magnet and a coil is located in the interior space of the socket near the bolt. The coil provides a current while the magnet provides a magnetic field such that the magnet and the coil generate an ultrasonic signal within the bolt. A detector is used to detect and measure a change in the ultrasonic signal at the bolt.
摘要翻译：用于测量诸如螺栓的部件上的负载的装置包括具有限定内部空间的壁的插座，其中插座与用于将负载传输到螺栓的螺栓接合。包括磁体和线圈的电磁声换能器位于插座附近的螺栓的内部空间中。线圈提供电流，同时磁体提供磁场，使得磁体和线圈在螺栓内产生超声波信号。检测器用于检测和测量螺栓上超声波信号的变化。

22. 发明授权

US5436873A Electrostatic shield for electromagnetic acoustic transducer noise rejection 失效
标题翻译：电磁屏蔽用于电磁换能器噪声抑制
公开(公告)号：US5436873A
公开(公告)日：1995-07-25
申请号：US251542
申请日：1994-05-31
申请人： Daniel T. MacLauchlan , Paul J. Latimer
发明人： Daniel T. MacLauchlan , Paul J. Latimer
IPC分类号： B06B1/04 , H04R23/00 , G01N9/24 , G01N29/04
CPC分类号： B06B1/04
摘要： A shield for an electromagnetic acoustic transducer (EMAT) has multiple layers of electrically insulating and electrically conductive materials which contain a coil of the EMAT. A first insulating layer lies directly on top of the coil and is attached thereto by a suitable layer of non-conductive adhesive. A second layer having both insulating and conductive portions is provided on a side of the coil opposite the first insulating layer such that the coil is completely encapsulated within and in direct contact only with the insulating portions of the first and second layers. The insulating portion of the second layer has a high electrical resistance. A third, conductive layer having a conductive adhesive side is provided in contact with the conductive portion of the second layer. The third layer is also provided with a window extending completely therethrough having dimensions coextensive with those of the coil; shielding of the coil itself by this third layer is thus prevented. Finally, a fourth insulating layer preferably made of a thin layer of ultrahigh molecular weight polyethylene or similar insulating material is attached to the underlying third, conductive layer by adhesive means.
摘要翻译：用于电磁声换能器（EMAT）的屏蔽件具有多层电绝缘和导电材料，其包含EMAT的线圈。第一绝缘层直接位于线圈的顶部，并通过合适的非导电粘合剂层附着在其上。具有绝缘和导电部分的第二层设置在与第一绝缘层相对的线圈的一侧上，使得线圈完全封装在第一和第二层的绝缘部分内并直接接触。第二层的绝缘部分具有高的电阻。具有导电粘合剂侧的第三导电层设置成与第二层的导电部分接触。第三层还设置有完全延伸的窗口，其具有与线圈的尺寸共同的尺寸; 因此防止了该第三层对线圈本身的屏蔽。最后，优选由超高分子量聚乙烯或类似绝缘材料的薄层制成的第四绝缘层通过粘合方式附着在下面的第三导电层上。

23. 发明授权

US07823454B2 Ultrasonic inspection method 有权
标题翻译：超声波检查方法
公开(公告)号：US07823454B2
公开(公告)日：2010-11-02
申请号：US11564346
申请日：2006-11-29
申请人： Daniel T. MacLauchlan , Bradley E. Cox
发明人： Daniel T. MacLauchlan , Bradley E. Cox
IPC分类号： G01B17/00
CPC分类号： G01N29/28 , G01N29/265 , G01N29/44 , G01N29/4463 , G01N2291/106
摘要： A method for ultrasonically inspecting components with wavy or uneven surfaces. A multi-element array ultrasonic transducer is operated with a substantial fluid layer, such as water, between the array transducer and the component surface. This fluid layer may be maintained by immersing the component in liquid or by using a captive couplant column between the probe and the component surface. The component is scanned, measuring the two dimensional surface profile using either a mechanical stylus, laser, or ultrasonic technique. Once an accurate surface profile of the component's surface has been obtained, data processing parameters are calculated for processing the ultrasonic signals reflected from the interior of the component that eliminate beam distortion effects and reflector mis-location that would otherwise occur due to the uneven surfaces.
摘要翻译：一种用于超声波检查具有波浪或不平坦表面的部件的方法。多阵列阵列超声波换能器在阵列换能器和部件表面之间用诸如水的实质流体层操作。该流体层可以通过将组分浸入液体中或通过在探针和组件表面之间使用捕获性耦合剂柱来维持。扫描组件，使用机械触针，激光或超声波技术测量二维表面轮廓。一旦已经获得了组件表面的精确表面轮廓，则计算数据处理参数，用于处理从组件内部反射的超声信号，消除由于不平坦表面而导致的波束失真效应和反射器错位。

24. 发明授权

US06250163B1 EMATS for spot weld examination 失效
标题翻译： EMATS进行点焊检测
公开(公告)号：US06250163B1
公开(公告)日：2001-06-26
申请号：US09265436
申请日：1999-03-09
申请人： Daniel T. MacLauchlan , Wayne M. Latham
发明人： Daniel T. MacLauchlan , Wayne M. Latham
IPC分类号： G01N2924
CPC分类号： G01N29/2412 , G01N2291/0251 , G01N2291/0421 , G01N2291/0422 , G01N2291/048 , G01N2291/102 , G01N2291/2672
摘要： An EMAT apparatus which non-destructively tests spot welds between two sheets of metal. The apparatus includes a first EMAT coil on one sheet that acts as a transmitter for generating and transmitting an acoustic wave signal toward the spot weld, and a second EMAT coil on the other sheet for receiving the acoustic wave signal and converting the received acoustic wave signal to an electronic signal having a waveform. Electronics and a PC are used to measure at least one parameter of the waveform which is indicative of a characteristic of the spot weld.
摘要翻译：一种非破坏性地测试两片金属之间的点焊的EMAT装置。该装置包括一个片上的第一EMAT线圈，其用作用于产生并传送声波信号到点焊的发射器，另一片上的第二EMAT线圈用于接收声波信号并将接收的声波信号涉及具有波形的电子信号。电子和PC用于测量表示点焊特征的波形的至少一个参数。

25. 发明授权

US06234026B1 Main bang recovery EMAT 有权
标题翻译：主要爆炸恢复EMAT
公开(公告)号：US06234026B1
公开(公告)日：2001-05-22
申请号：US09620083
申请日：2000-07-20
申请人： Daniel T. MacLauchlan , Jimmy W. Hancock
发明人： Daniel T. MacLauchlan , Jimmy W. Hancock
IPC分类号： G01N2924
CPC分类号： G01N29/2412 , B06B1/045 , G01N2291/0422 , G01N2291/0423 , G01N2291/102
摘要： An EMAT arrangement utilizes separate transmitter and receiver EMATs which may each be connected to a tuning capacitor by a stripline cable. An electrostatic shield may also be provided between the coils and the coils can be offset from each other by ½ the pitch distance of sections in the coil. This reduces the duration of main bang, thus making it possible for the EMAT arrangement to detect structures which are very close to the coils.
摘要翻译： EMAT装置使用单独的发射器和接收器EMAT，其可以通过带状线缆连接到调谐电容器。也可以在线圈之间设置静电屏蔽，并且线圈可以彼此偏移线圈中部分的间距距离的1/2。这减少了主爆的持续时间，从而使得EMAT装置可以检测非常接近线圈的结构。

26. 发明授权

US06192760B1 EMAT transmit/receive switch 有权
标题翻译： EMAT发送/接收开关
公开(公告)号：US06192760B1
公开(公告)日：2001-02-27
申请号：US09377453
申请日：1999-08-19
申请人： Daniel T. MacLauchlan , Charles B. Overby
发明人： Daniel T. MacLauchlan , Charles B. Overby
IPC分类号： G01N2904
CPC分类号： G01N29/2412 , G01N29/34 , G01N29/348 , G01N29/36
摘要： A transmitting and receiving switch assembly for an electromagnetic acoustic transducer (EMAT) and a method for selectively switching an EMAT between transmit mode and receive mode both use a particular circuit. This circuit contains an EMAT coil coupled to a tuning capacitor, which allows the EMAT to be operated at a desired frequency when transmitting. A set of capacitors separates the EMAT coil from a set of diode strings (preferably containing at least one fast switching silicon diode), which are joined by a resistive connection. A transformer, which is center tapped at its primary winding, is coupled to the other end of the diode strings. Finally, a receiver input is connected to the transformer. In operation, the frequency of the EMAT is set by appropriately energizing and tuning the tuning capacitor. A voltage is then applied in the center tapped transformer and in the resistive link between the diode strings. The current automatically switches the conductivity of the diodes and permits the EMAT to switch modes as desired. Likewise, the method disclosed also utilizes this circuit, as described above, and involves several steps. First, the EMAT frequency must be selected and set, using the tuning capacitor. Then, a voltage is applied within the circuit to induce transmission by the EMAT. Next a sinusodial toneburst is given within the circuit to switch the transmit/receive capabilities of the EMAT, and then observing the input received by the EMAT-thereby permitting the alternate switching of the EMAT from receive to transmit mode in a matter of nanoseconds.
摘要翻译：用于电磁声换能器（EMAT）的发射和接收开关组件以及用于在发射模式和接收模式之间选择性地切换EMAT的方法都使用特定电路。该电路包含耦合到调谐电容器的EMAT线圈，其允许当发射时EMAT以期望的频率运行。一组电容器将EMAT线圈与通过电阻连接连接的一组二极管串（优选地包含至少一个快速开关硅二极管）分离。在其初级绕组处中心抽头的变压器耦合到二极管串的另一端。最后，接收机输入连接到变压器。在运行中，EMAT的频率通过适当地激励和调谐调谐电容来设定。然后在中心抽头变压器和二极管串之间的电阻链路中施加电压。电流自动切换二极管的电导率，并允许EMAT根据需要切换模式。同样地，所公开的方法也利用了如上所述的该电路，并且涉及几个步骤。首先，使用调谐电容必须选择和设置EMAT频率。然后，在电路内施加电压以引起EMAT的传输。接下来，在电路内给出正弦信号突发，以切换EMAT的发射/接收能力，然后观察EMAT接收的输入，从而允许EMAT从接收到发射模式的交替切换以纳秒为单位。

27. 发明授权

US06176132B1 Method for determining liquid level in a container using an electromagnetic acoustic transducer (EMAT) 失效
标题翻译：使用电磁声换能器（EMAT）确定容器中的液位的方法
公开(公告)号：US06176132B1
公开(公告)日：2001-01-23
申请号：US08704956
申请日：1996-08-29
申请人： Daniel T. MacLauchlan
发明人： Daniel T. MacLauchlan
IPC分类号： G01F2328
CPC分类号： G01N29/024 , G01F23/284 , G01F23/2962 , G01N29/032 , G01N29/2412 , G01N2291/015 , G01N2291/02818 , G01N2291/02836 , G01N2291/0421 , G01N2291/0422
摘要： An ultrasonic method for determining liquid level in a container employs an electromagnetic acoustic transducer (EMAT) to launch and receive longitudinal ultrasonic waves into a thin metal wall or thin metal foil seal of the container, causing it to vibrate and launch ultrasonic compressional waves into liquid contained therein. The compressional waves travel through the liquid contents and reflect off an interface, returning to the thin metal wall and causing it to vibrate in the presence of the magnetic field produced by the EMAT transducer assembly. This induces a voltage in the eddy current coil of the EMAT transducer assembly, and by measuring a time of flight of the ultrasonic compressional waves through the liquid contents, and by using a preestablished value for a velocity of the ultrasonic compressional waves within the liquid contents, the liquid level of the contents can be determined.
摘要翻译：用于确定容器中的液位的超声波方法使用电磁声换能器（EMAT）将纵向超声波发射并接收到容器的薄金属壁或薄金属箔密封件中，使其振动并将超声波压缩波发射到液体中其中包含。压缩波穿过液体内容物并反射出界面，返回到薄金属壁并使其在由EMAT传感器组件产生的磁场的存在下振动。这在EMAT换能器组件的涡流线圈中引起电压，并且通过测量超声压缩波通过液体内容物的飞行时间，并且通过使用预定值来确定液体内容物内超声压缩波的速度可以确定内容物的液位。

28. 发明授权

US6158285A EMAT inspection of welds in thin steel plates of dissimilar thicknesses 失效
标题翻译：对不同厚度的薄钢板焊缝的EMAT检测
公开(公告)号：US6158285A
公开(公告)日：2000-12-12
申请号：US918292
申请日：1997-08-26
申请人： Paul J. Latimer , Daniel T. MacLauchlan
发明人： Paul J. Latimer , Daniel T. MacLauchlan
IPC分类号： G01N29/07 , G01N29/24 , G01N29/10
CPC分类号： G01N29/2456 , G01N29/0645 , G01N29/07 , G01N29/2412 , G01N2291/0423 , G01N2291/0427 , G01N2291/044 , G01N2291/102 , G01N2291/267
摘要： A method for inspecting welds uses a single EMAT tranducer operated in pulse-echo mode that sends and receives Rayleigh waves to detect defects in a weld between sheet plates of dissimilar thicknesses.
摘要翻译：用于检查焊缝的方法使用以脉冲回波模式操作的单个EMAT传感器，其发送和接收瑞利波，以检测不同厚度的板之间的焊缝中的缺陷。

29. 发明授权

US6155117A Edge detection and seam tracking with EMATs 有权
标题翻译：边缘检测和跟踪EMAT
公开(公告)号：US6155117A
公开(公告)日：2000-12-05
申请号：US271742
申请日：1999-03-18
申请人： Donald M. Stevens , Daniel T. MacLauchlan , Paul J. Berbakov
发明人： Donald M. Stevens , Daniel T. MacLauchlan , Paul J. Berbakov
IPC分类号： G01N29/04 , G01N29/24 , G01N29/18
CPC分类号： G01N29/2412 , G01N29/041 , G01N2291/011 , G01N2291/0422 , G01N2291/0423 , G01N2291/102
摘要： A method for detecting the location of an edge, interface, seam or other structure of a workpiece uses one or two electromagnetic acoustic transducers (EMATs) to transmit an ultrasonic wave along the workpiece toward the edge and to receive a reflected wave. The velocity of the wave in the material is used in conjunction with the round trip time-of-flight (TOF) of the transmitted and reflected wave, to calculate the location of the edge. This is done by placing the transducer or transducers at known locations on the workpiece. A surface wave or 90 degree shear wave can be utilized and no contact is needed between the transducer and the surface of the workpiece. Rough and/or dirty surfaces and hostile environments can be accommodated while practicing the invention.
摘要翻译：用于检测工件的边缘，界面，接缝或其他结构的位置的方法使用一个或两个电磁声换能器（EMAT）沿着工件向边缘传送超声波并接收反射波。材料中波的速度与发射和反射波的往返飞行时间（TOF）一起使用，以计算边缘的位置。这通过将传感器或换能器放置在工件上的已知位置来完成。可以使用表面波或90度剪切波，并且在换能器和工件表面之间不需要接触。在实施本发明时可以容纳粗糙和/或脏的表面和恶劣的环境。

30. 发明授权

US5708354A Portable electromagnetic acoustic transducer pulser controller 失效
标题翻译：便携式电磁声换能器脉冲发生器控制器
公开(公告)号：US5708354A
公开(公告)日：1998-01-13
申请号：US768733
申请日：1996-12-18
申请人： Jimmy W. Hancock , Daniel T. MacLauchlan , Charles B. Overby
发明人： Jimmy W. Hancock , Daniel T. MacLauchlan , Charles B. Overby
IPC分类号： H04R3/00 , H03K17/72
CPC分类号： H04R3/00
摘要： A variable power source is provided having multiple power modules each of which can produce a portion of the total range of voltage required for pulsed operation of an electromagnetic acoustic transducer electromagnet. The power modules are connected in series, and controlled by individual potentiometers which are simultaneously adjusted. Selector switches are provided for enabling or disabling each module. The output of the power modules is connected to a pulser/controller for wave forming prior to sending the output signal to the electromagnet. A noise filter can be placed between the power modules and the pulser. LED-type indicators on the selector switches may be used to indicate the operational status of the modules.
摘要翻译：提供了具有多个功率模块的可变电源，每个功率模块可以产生电磁声换能器电磁体的脉冲操作所需的总电压范围的一部分。电源模块串联连接，并由同时调节的各个电位器控制。提供选择器开关用于启用或禁用每个模块。在将输出信号发送到电磁体之前，功率模块的输出连接到用于波形成形的脉冲发生器/控制器。噪声滤波器可以放置在电源模块和脉冲发生器之间。选择开关上的LED指示灯可用于指示模块的运行状态。

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