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公开(公告)号：US5608691A
公开(公告)日：1997-03-04
申请号：US503777
申请日：1996-07-18
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。
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公开(公告)号：US5675087A
公开(公告)日：1997-10-07
申请号：US594051
申请日：1996-01-30
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。
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公开(公告)号：US06250163B1
公开(公告)日：2001-06-26
申请号：US09265436
申请日：1999-03-09
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。
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公开(公告)号：US5760307A
公开(公告)日：1998-06-02
申请号：US531573
申请日：1995-09-07
CPC分类号： B06B1/04 , G01N29/07 , G01N29/2412 , G01N29/2487 , G01N2291/0422 , G01N2291/0423 , G01N2291/0427 , G01N2291/044 , G01N2291/052 , G01N2291/101 , G01N2291/267
摘要： A method and apparatus of inspecting for flaws in a specular reflector, where the flaws having an expected length and the reflector is electrically conductive. The method includes directing a beam of an electromagnetic acoustic transmitting transducer along a beam axis toward the specular reflector for producing a reflected electromagnetic acoustic beam. The transmitted beam has side lobes with zero points therebetween, at least some of the side lobes being major side lobes. The reflected beam is received using an electromagnetic acoustic receiving transmitter set at an angle to the beam axis, the angle being selected to be at one of the zero points and past all of the major lobes of the transmitted beam to eliminate root and crown signals of the weld, in the reflected signal.
摘要翻译： 检查镜面反射器中的缺陷的方法和装置，其中具有期望长度的缺陷和反射器是导电的。 该方法包括将电磁声发射换能器的光束沿着光束轴线朝向镜面反射器引导以产生反射的电磁声束。 透射光束具有在其间具有零点的旁瓣，至少一些旁瓣是主旁瓣。 使用与波束轴成一定角度的电磁声接收发射机来接收反射光束，该角度被选择为处于透射光束的零点和所有主波瓣之一处，以消除透射光束的根和冠状信号 焊缝，在反射信号中。
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5.发明授权
公开(公告)号：US6158285A
公开(公告)日：2000-12-12
申请号：US918292
申请日：1997-08-26
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。
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公开(公告)号：US5714689A
公开(公告)日：1998-02-03
申请号：US842402
申请日：1997-04-24
IPC分类号： G01N29/04 , G01N29/24 , G01N29/265 , G01N29/20
CPC分类号： G01N29/2412 , G01N29/265 , G01N2291/0422 , G01N2291/0423 , G01N2291/044 , G01N2291/048 , G01N2291/105 , G01N2291/2632
摘要： A flaw detection method and arrangement utilizes electromagnetic acoustic transducers (EMATs) which ultrasonically test a material for cracks or flaws. Four EMATs are used in a pitch-catch configuration, i.e. two pairs of EMAT transmitters and receivers. The EMAT transmitters and receivers are arranged such that a first EMAT transmitter is located on the surface diagonally across from a first EMAT receiver and a second EMAT transmitter is located diagonally across from a second EMAT receiver. The first and second EMAT transmitters transmit ultrasonic signals to the first and second EMAT receivers respectively; and these ultrasonic signals are transmitted orthogonal to each other. A pulser/receiver is operatively connected to the first and second EMAT transmitters and the first and second EMAT receivers for inducing the EMAT transmitters to propagate their respective waves. The pulser/receiver also receives the signal transmitted through the material after being received by the first and second EMAT receivers. A power source is operatively connected to the pulser/receiver for powering the arrangement; and a computer or oscillator is operatively connected to the pulser/receiver for recording and displaying the signals.
摘要翻译： 瑕疵检测方法和装置使用电磁声换能器（EMAT），其超声波测试材料的裂纹或缺陷。 四个EMAT用于俯仰配置，即两对EMAT发射机和接收机。 EMAT发射器和接收器布置成使得第一EMAT发射器位于第一EMAT接收器的对角线上的表面上，并且第二EMAT发射器位于与第二EMAT接收器对角地对准的位置。 第一和第二EMAT发射机分别向第一和第二EMAT接收机发送超声波信号; 并且这些超声波信号彼此正交地传输。 脉冲发生器/接收器可操作地连接到第一和第二EMAT发射器以及第一和第二EMAT接收器，用于诱导EMAT发射器传播它们各自的波。 脉冲发生器/接收器还在由第一和第二EMAT接收器接收之后接收通过材料传输的信号。 电源可操作地连接到脉冲发生器/接收器以为该装置供电; 并且计算机或振荡器可操作地连接到脉冲发生器/接收器用于记录和显示信号。
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7.发明授权
公开(公告)号：US5436873A
公开(公告)日：1995-07-25
申请号：US251542
申请日：1994-05-31
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。
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公开(公告)号：US6122969A
公开(公告)日：2000-09-26
申请号：US138620
申请日：1998-08-24
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。
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公开(公告)号：US5684406A
公开(公告)日：1997-11-04
申请号：US615754
申请日：1996-03-13
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。
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公开(公告)号：US4777824A
公开(公告)日：1988-10-18
申请号：US66772
申请日：1987-06-25
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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