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1. 发明授权

US3852663A Pulse eddy current testing apparatus using pulses having a 50% duty cycle and precise quadrature gates 失效
标题翻译：脉冲EDDY电流测试装置使用具有50％占空比的脉冲和精确的栅格
公开(公告)号：US3852663A
公开(公告)日：1974-12-03
申请号：US44114874
申请日：1974-02-11
申请人： MAGNETIC ANALYSIS CORP
发明人： BROOKS R , BEBICK P
IPC分类号： G01N27/90 , G01R33/12
CPC分类号： G01N27/9046
摘要： A sine wave oscillator feeds a square wave generator. Pulse generator means produces 50 percent duty cycle pulses having leading and trailing edges coinciding with alternate edges of the square wave and 25 percent duty cycle pulses having leading and trailing edges coinciding with successive edges of the square wave. Gate generating means produces one series of gating pulses coinciding with the leading or trailing edges of the 50 percent duty cycle pulses and a second series coinciding with edges of the 25 percent duty cycle pulses lying halfway between the edges of the 50 percent duty cycle pulses or halfway between successive pulses. The 50 percent duty cycle pulses drive test coil means whose output is supplied to an amplifier tuned to the PRF thereof, and then to a pair of quadrature detectors supplied with respective series of gating pulses.
摘要翻译：正弦波振荡器馈送方波发生器。脉冲发生器装置产生50％的占空比脉冲，其前沿和后沿与方波的交替边缘重合，并且具有与方波的连续边缘重合的前沿和后沿的25％占空比脉冲。栅极产生装置产生与50％占空比脉冲的前沿或后沿相重合的一系列门控脉冲，以及与位于50％占空比脉冲的边缘之间的25％占空比脉冲的边缘重合的第二个串联，连续脉冲之间的中间。 50％的占空比脉冲驱动测试线圈装置，其输出被提供给调谐到其PRF的放大器，然后被提供给一对正交检测器，其被提供有各个选通脉冲串。

2. 发明授权

US3823368A Calibration and balance system in pulse eddy current testing apparatus 失效
标题翻译：脉冲EDDY电流测试装置的校准和平衡系统
公开(公告)号：US3823368A
公开(公告)日：1974-07-09
申请号：US35835973
申请日：1973-05-08
申请人： MAGNETIC ANALYSIS CORP
发明人： MANSSON S , BROOKS R , BEBICK P
IPC分类号： G01N27/90 , G01R33/12
CPC分类号： G01N27/9046 , G01N27/9086
摘要： The pulse eddy current testing apparatus includes test coil means having a primary winding(s) supplied with driving pulses, and a pair of secondary windings in series opposition for producing output signals varying with defects or flaws in objects under test. The output signals are supplied to an input transformer and tuned amplifier, and then through an attenuator to a pair of phase-sensitive detectors. The quadrature outputs of the detectors are supplied to an oscilloscope for indicating the amplitude and phase of the signals supplied thereto. The calibration and balance check apparatus includes a low frequency pulse source, a calibrate transformer having a primary in series with the primary winding(s) of the test coil means, a calibrate generator for receiving the outputs of the calibrate transformer and the low frequency pulse source to produce a modulated calibration check signal, and a balance generator for connection to the output circuit of the tuned amplifier and the low frequency pulse source for producing a modulated balance check signal. Switchable means in the calibration condition connects a low impedance across the primary winding(s) of the test coil means, disconnects the secondary windings from the input transformer, and supplies the calibration check signal to the input transformer to produce a calibration check indication on the oscilloscope. For balance check the test coil means is connected to the input transformer, and the balance check signal is supplied through the attenuator to the detectors to produce a balance check indication on the oscilloscope. Provision is made to standardize the displays on the oscilloscope so that proper calibration and balance are readily observed, and adjustments facilitated.

3. 发明授权

US3798539A Pulse eddy current testing apparatus using pulses having a 25% duty cycle with gating at pulse edges 失效
标题翻译：脉冲EDDY电流测试装置使用脉冲激光器在25脉冲周期进行脉冲激光
公开(公告)号：US3798539A
公开(公告)日：1974-03-19
申请号：US3798539D
申请日：1973-02-15
申请人： MAGNETIC ANALYSIS CORP
发明人： BROOKS R , BEBICK P
IPC分类号： G01N27/90 , G01R33/12
CPC分类号： G01N27/9046
摘要： Pulses having a pulse width equal to one-quarter wavelength at a multiple (including 1) of the fundamental frequency of the pulses are applied to the test coil assembly of a pulse eddy current testing apparatus, and the output signals are supplied to an amplifier tuned to said multiple of the fundamental frequency. The output of the amplifier is supplied to a pair of phasesensitive detectors which are gated at the leading and trailing edges of the applied pulses to produce quadrature signal components. These components are utilized to produce indications of defects or flaws in the object under test. The test coil assembly is advantageously designed to produce an approximately null output in the absence of defects or flaws. The pulses may have a 25 percent duty cycle with the amplifier tuned to the PRF thereof.
摘要翻译：具有脉冲宽度等于脉冲基频的多（包括1）的四分之一波长的脉冲被施加到脉冲涡流测试装置的测试线圈组件，并且输出信号被提供给放大器调谐到所述倍数的基本频率。放大器的输出被提供给一对相位敏感检测器，这些检测器在所施加的脉冲的前沿和后沿被选通以产生正交信号分量。这些组件用于产生被测物体中的缺陷或缺陷的迹象。测试线圈组件有利地被设计成在不存在缺陷或缺陷的情况下产生近似无效的输出。脉冲可以具有25％的占空比，其中放大器被调谐到其PRF。

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