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1. 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。

2. 发明授权

US6122969A Main bang recovery EMAT 有权
标题翻译：主要爆炸恢复EMAT
公开(公告)号：US6122969A
公开(公告)日：2000-09-26
申请号：US138620
申请日：1998-08-24
申请人： Daniel T. MacLauchlan , Jimmy W. Hancock
发明人： Daniel T. MacLauchlan , Jimmy W. Hancock
IPC分类号： B06B1/04 , G01N29/24
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 1/2 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，并且线圈可以通过+ E，fra 1/2 + EE彼此偏移，线圈中部分的间距距离。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。

3. 发明授权

US6164137A Electromagnetic acoustic transducer (EMAT) inspection of tubes for surface defects 有权
标题翻译：用于表面缺陷的管的电磁声换能器（EMAT）检查
公开(公告)号：US6164137A
公开(公告)日：2000-12-26
申请号：US243592
申请日：1999-02-03
申请人： Jimmy W. Hancock , Daniel T. MacLauchlan
发明人： Jimmy W. Hancock , Daniel T. MacLauchlan
IPC分类号： G01N29/07 , G01N29/24 , G01N29/08 , G01N29/28
CPC分类号： G01N29/2412 , G01N29/07 , G01N2291/015 , G01N2291/0423 , G01N2291/048 , G01N2291/103 , G01N2291/2634
摘要： An EMAT testing device for nondestructively testing tubes for surface defects and displaying the results has a EMAT transmitter arranged collinear with a pair of EMAT receivers. The EMAT receivers each receive a pair of oppositely propagating circumferential acoustic surface waves from the transmitter at different times and the relative amplitudes of the received waves are compared to located defects adjacent the receivers in the tube.
摘要翻译：用于非破坏性地测试用于表面缺陷的管和用于显示结果的EMAT测试装置具有与一对EMAT接收器共线的EMAT发射器。 EMAT接收器在不同时间接收来自发射器的一对相反传播的周向声表面波，并将接收波的相对幅度与管中的接收器相邻的定位缺陷进行比较。

4. 发明授权

US06282964B1 Electromagnetic acoustic transducer (EMAT) inspection of cracks in boiler tubes 失效
标题翻译：锅炉管中裂纹的电磁换能器（EMAT）检测
公开(公告)号：US06282964B1
公开(公告)日：2001-09-04
申请号：US09398621
申请日：1999-09-17
申请人： Jimmy W. Hancock , Daniel T. MacLauchlan , Ralph D. Murphy
发明人： Jimmy W. Hancock , Daniel T. MacLauchlan , Ralph D. Murphy
IPC分类号： G01N2900
CPC分类号： G01N29/2412 , G01M3/24 , G01N29/0645 , G01N29/223 , G01N2291/0423 , G01N2291/2634
摘要： An EMAT device for non-destructive inspection of the surface of a tube for cracks using acoustic surface waves includes a pulsed magnet having an active surface for facing the surface of a tube to be inspected. A receive emat coil is on the active surface and a transmit emat coil is on the opposite surface of the receive coil. The transmit emat coil has a scan surface for scanning over the tube surface. A transmitter for generating and transmitting an RF signal to the transmit emat coil is provided for generating a transmitted acoustic wave signal along the tube, the transmitted wave creating a reflected acoustic wave if a crack in the tube is encountered, the reflected wave generating a reflection signal in the receive emat coil. A receiver is connected to the receive emat coil for receiving the reflection signal. A digital computer is connected to the receiver for receiving and for processing the reflection signal and a display displays information about a crack in the tube which created the reflected acoustic wave and resulting reflection signal.
摘要翻译：使用声表面波对用于裂纹的管表面进行非破坏性检查的EMAT装置包括具有用于面对要检查的管的表面的活性表面的脉冲磁体。接收发射线圈位于有源表面上，发射极化线圈位于接收线圈的相对表面上。发射Emat线圈具有用于在管表面上扫描的扫描表面。用于产生和发送RF信号到发射发射线圈的发射器用于沿着管产生传输的声波信号，如果遇到管中的裂纹，发射波产生反射的声波，反射波产生反射信号在接收emat线圈。接收器连接到接收发射线圈以接收反射信号。数字计算机连接到接收器，用于接收和处理反射信号，并且显示器显示关于产生反射的声波和产生的反射信号的管中裂纹的信息。

5. 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。

6. 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。

7. 发明授权

US5684406A Electromagnetic acoustic transducer fault detection circuit 失效
标题翻译：电磁换能器故障检测电路
公开(公告)号：US5684406A
公开(公告)日：1997-11-04
申请号：US615754
申请日：1996-03-13
申请人： Daniel T. MacLauchlan , Kenneth R. Camplin , Bradley E. Cox , Daniel Geier
发明人： Daniel T. MacLauchlan , Kenneth R. Camplin , Bradley E. Cox , Daniel Geier
IPC分类号： G01R31/06 , G01R35/00
CPC分类号： G01R31/2829
摘要： A fault detecting circuit for use with an electromagnetic acoustic transducer having an electrostatic shield and a wear surface for determining when the wear surface for contacting test surfaces has developed holes.
摘要翻译：一种与具有静电屏蔽的电磁换能器一起使用的故障检测电路和用于确定何时用于接触测试表面的磨损表面已经形成空穴的磨损表面。

8. 发明授权

US5675087A Fastener characterization with an electromagnetic acoustic transducer 失效
标题翻译：紧固件表征与电磁声换能器
公开(公告)号：US5675087A
公开(公告)日：1997-10-07
申请号：US594051
申请日：1996-01-30
申请人： Daniel T. MacLauchlan , Wayne M. Latham , Steven P. Clark
发明人： Daniel T. MacLauchlan , Wayne M. Latham , Steven P. Clark
IPC分类号： G01L5/00 , F16B31/02 , G01H11/00 , G01L1/25 , G01L5/24 , G01M13/00 , G01N29/04 , G01N29/24
CPC分类号： G01L5/246 , G01L1/25 , G01N29/045 , G01N29/2412 , F16B2031/022 , G01N2291/011 , G01N2291/015 , G01N2291/02827 , G01N2291/0423 , G01N2291/044 , G01N2291/101 , G01N2291/2691 , G01N2291/2695
摘要： A device for measuring a load on a part and for monitoring the integrity of the 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 for measuring the load on the bolt and for detecting any flaws in the bolt.
摘要翻译：用于测量部件上的负载并用于监测诸如螺栓的部件的完整性的装置包括具有限定内部空间的壁的插座，其中插座接合用于将负载传输到螺栓的螺栓。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处的超声信号的变化，以测量螺栓上的负载并检测螺栓中的任何缺陷。

9. 发明授权

US5608691A EMAT with integral electrostatic shield 失效
标题翻译： EMAT带有整体静电屏蔽
公开(公告)号：US5608691A
公开(公告)日：1997-03-04
申请号：US503777
申请日：1996-07-18
申请人： Daniel T. MacLauchlan , Paul J. Latimer , Wayne M. Latham
发明人： Daniel T. MacLauchlan , Paul J. Latimer , Wayne M. Latham
IPC分类号： B06B1/04 , H04R23/00
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.An alternative shield and coil arrangement is also disclosed, wherein the coil is etched on one side of a substrate and a corresponding shield configuration is etched on the other side, resulting in an integrated shield and coil assembly for use in an electromagnetic acoustic transducer.
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。还公开了另一种屏蔽和线圈装置，其中线圈在衬底的一侧被蚀刻，并且在另一侧蚀刻相应的屏蔽结构，从而形成用于电磁声换能器的集成屏蔽和线圈组件。

10. 发明授权

US4777824A Electromagnetic acoustic transducer 失效
标题翻译：电磁换能器
公开(公告)号：US4777824A
公开(公告)日：1988-10-18
申请号：US66772
申请日：1987-06-25
申请人： George A. Alers , Leigh R. Burns, Jr. , Daniel T. MacLauchlan
发明人： George A. Alers , Leigh R. Burns, Jr. , Daniel T. MacLauchlan
IPC分类号： B06B1/04 , G01N29/24 , G01N29/04
CPC分类号： G01N29/2412 , B06B1/04 , G01N2291/0234 , G01N2291/0423 , G01N2291/0427
摘要： A noncontact ultrasonic transducer for studying the acoustic properties of a metal workpiece includes a generally planar magnetizing coil positioned above the surface of the workpiece, and a generally planar eddy current coil between the magnetizing coil and the workpiece. When a large current is passed through the magnetizing coil, a large magnetic field is applied to the near-surface regions of the workpiece. The eddy current coil can then be operated as a transmitter by passing an alternating current therethrough to excite ultrasonic waves in the surface of the workpiece, or operated as a passive receiver to sense ultrasonic waves in the surface by measuring the output signal. The geometries of the two coils can be varied widely to be effective for different types of ultrasonic waves. The coils are preferably packaged in a housing which does not interfere with their operation, but protects them from a variety of adverse environmental conditions.
摘要翻译：用于研究金属工件的声学特性的非接触式超声换能器包括位于工件表面上方的大致平面的磁化线圈，以及位于磁化线圈和工件之间的大体平面的涡流线圈。当大电流通过磁化线圈时，大的磁场被施加到工件的近表面区域。涡流线圈然后可以通过使交流电流通过其来激发工件表面中的超声波，或者作为无源接收器操作，作为发射器，以通过测量输出信号来感测表面中的超声波。两个线圈的几何形状可以广泛地变化，以对于不同类型的超声波是有效的。线圈优选地包装在壳体中，其不干扰其操作，而是保护它们免受各种不利的环境条件的影响。

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