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1. 发明授权

US5526213A Ground fault protection for EMAT transistor switched magnet pulsers 失效
标题翻译： EMAT晶体管开关磁铁脉冲器的接地故障保护
公开(公告)号：US5526213A
公开(公告)日：1996-06-11
申请号：US285245
申请日：1994-08-03
申请人： Daniel T. MacLauchlan , Karl C. Henderson
发明人： Daniel T. MacLauchlan , Karl C. Henderson
IPC分类号： H02H3/16 , H02H3/26
CPC分类号： H02H3/16
摘要： A fast reacting ground fault interrupter circuit particularly suited for use with high current, high voltage DC pulses generated by transistor switched magnet pulsers driving pulsed electromagnets used with electromagnetic acoustic transducers (EMATs). Whenever a ground fault is detected, a digital shut off signal is sent to the transistor switched magnet pulser to shut it off and prevent transmission of the DC pulse. Additionally, the shut off signal is also provided to a DC current interrupter which shuts off power supplied to the transistor switched magnet pulser itself.
摘要翻译：特别适用于驱动与电磁声换能器（EMAT）一起使用的脉冲电磁铁的晶体管开关磁铁脉冲器产生的高电流，高压直流脉冲的快速反应接地故障断路器电路。每当检测到接地故障时，数字切断信号被发送到晶体管开关磁脉冲器，以将其关闭并防止DC脉冲的传输。此外，截止信号还提供给截止被提供给晶体管开关磁脉冲发生器本身的电力的直流电流断续器。

2. 发明授权

US5511424A Remote preamplifier and impedance matching circuit for electromagnetic acoustic transducer 失效
标题翻译：遥控前置放大器和阻抗匹配电路用于电磁换能器
公开(公告)号：US5511424A
公开(公告)日：1996-04-30
申请号：US196661
申请日：1994-02-15
申请人： Daniel T. MacLauchlan , Karl C. Henderson , John H. Flora
发明人： Daniel T. MacLauchlan , Karl C. Henderson , John H. Flora
IPC分类号： B06B1/02 , B06B1/04 , G01N29/22 , G01N29/24 , G01N29/34 , G01N29/36 , G01N29/04
CPC分类号： G01N29/34 , B06B1/0207 , B06B1/04 , G01N29/22 , G01N29/2412 , G01N29/36 , B06B2201/58
摘要： A preamplification and impedance matching circuit for an electromagnetic acoustic transducer includes an impedance matching section of the circuit having input terminals for receiving radio frequency power from a radio frequency power source. A matching transformer, which is a step-down transformer, is operatively connected to the input terminals. Diode networks are operatively connected to the matching transformer and output terminals which lead to the coil of the transducer. Signal responses emitted by the transducer coil are transmitted to a preamplifier section of the circuit. Choke coils or resistors are used to limit radio frequency power entry into the preamplifier section of the circuit. The preamplifier section has a preamplifier which is operatively connected to a first transformer and a second transformer such that the transformer are located on opposite sides of the preamplifier for increasing the amplitude of the coil signal response prior to transmission to detectors located in the instrumentation of the transducer.
摘要翻译：用于电磁声换能器的前置放大和阻抗匹配电路包括具有用于从射频电源接收射频功率的输入端的电路的阻抗匹配部分。作为降压变压器的匹配变压器可操作地连接到输入端子。二极管网络可操作地连接到匹配的变压器和输出端子，其通向换能器的线圈。由换能器线圈发出的信号响应被传送到电路的前置放大器部分。扼流线圈或电阻用于限制射频功率进入电路的前置放大器部分。前置放大器部分具有前置放大器，其可操作地连接到第一变压器和第二变压器，使得变压器位于前置放大器的相对侧，用于在传输到位于仪器的检测器中的检测器之前增加线圈信号响应的幅度传感器。

3. 发明授权

US5449958A Diode expander for electromagnetic acoustic transducer electronics 失效
标题翻译：二极管扩展器用于电磁换能器电子
公开(公告)号：US5449958A
公开(公告)日：1995-09-12
申请号：US272897
申请日：1994-07-08
申请人： Daniel T. MacLauchlan , Karl C. Henderson
发明人： Daniel T. MacLauchlan , Karl C. Henderson
IPC分类号： G01N29/22 , G01N29/24 , G01N29/36 , H02J3/06
CPC分类号： G01N29/36 , G01N29/22 , G01N29/2418 , Y10T307/297
摘要： An electrical circuit incorporating an improved diode expander network for an EMAT having a coil and a radio frequency power source which emits radio frequency power, and which blocks noise and interference while having the ability to operate at high frequencies and high current/power levels. A matching transformer having a primary side is operatively connected to the radio frequency source for receiving the radio frequency power. The transformer also has a secondary side having a first leg and a second leg. The matching transformer is normally a step-down transformer. A diode expander network is provided having a first pair of composite diodes connected in parallel with respect to each other to the first leg of the transformer, and a second pair of composite diodes connected in parallel with respect to each other to the second leg of the transformer. Each composite diode has a plurality of diodes arranged in a series and parallel relationship. One of the composite diodes in each pair is arranged to conduct electricity therethrough in a first direction while the other composite diode in each pair is arranged to conduct electricity therethrough in a second direction, opposite to the first direction.
摘要翻译：一种具有用于EMAT的改进的二极管扩展器网络的电路，其具有发射射频功率的线圈和射频电源，并且在具有在高频和高电流/功率电平下操作的能力的同时阻挡噪声和干扰。具有初级侧的匹配变压器可操作地连接到射频源以接收射频功率。变压器还具有具有第一腿和第二腿的次级侧。匹配变压器通常是降压变压器。提供二极管扩展器网络，其具有相对于彼此并联连接到变压器的第一支路的第一对复合二极管，以及相对于彼此并联连接到第二支路的第二对复合二极管变压器。每个复合二极管具有串联并联的多个二极管。每对中的复合二极管之一布置成在第一方向上导通电流，而每对中的另一复合二极管被布置成在与第一方向相反的第二方向上导电通过其中。

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