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    • 1. 发明授权
    • Eddy current testing apparatus using segmented monoturn conductive members
    • 涡流测试装置采用分段单调导电构件
    • US3887865A
    • 1975-06-03
    • US44284774
    • 1974-02-15
    • MAGNETIC ANALYSIS CORP
    • BROOKS ROBERT A
    • G01N27/90G01R19/00G01R33/12
    • G01N27/9033G01R19/0092
    • One or more monoturn conductive members are formed of a plurality of separate segments which are assembled in insulated relationship in an opening of a body section which supports one or more coils encircling the opening. The assembled segments are secured in the body section in cooperative relationship with the coil(s) and provide an inner aperture for receiving an object to be tested. Enlarged ends or intermediate portions of objects may be passed through the opening in the body section and the segments then inserted and secured in place. A coil energized with alternating or pulsed current produces current flow in like directions around the surface segments of the aperture and thereby produces a magnetic field which induces eddy currents in the object. Variations in the eddy currents are detected and indicated. A pair of segmented monoturn members with respective detector coils supported by the body section may be employed.
    • 一个或多个单调导电构件由多个分离的段形成,它们以支撑围绕开口的一个或多个线圈的主体部分的开口中以绝缘关系组装。 组装的部分与主体部分固定在主体部分中,并且提供用于接收待测试对象的内部孔。 物体的扩大的端部或中间部分可以穿过主体部分中的开口,然后段被插入并固定就位。 用交替或脉冲电流通电的线圈在围绕孔的表面段的相同方向上产生电流,从而产生在物体中引起涡流的磁场。 检测并指示涡流的变化。 可以使用一对分段的单体构件,其具有由身体部分支撑的相应的检测器线圈。
    • 2. 发明授权
    • Eddy current testing apparatus using slotted monoturn conductive members
    • 涡流检测仪采用开槽单调导电构件
    • US3872379A
    • 1975-03-18
    • US39250973
    • 1973-08-29
    • MAGNETIC ANALYSIS CORP
    • BROOKS ROBERT AWALLACE JOHN PAUL
    • G01N27/90G01R27/00G01R33/14
    • G01N27/9033G01R27/00
    • One or more monoturn conductive members are employed having an inner aperture and an encircling surface with a slot extending from the aperture to the encircling surface. An encircling coil supplied with alternating or pulsed current produces current flow around the inner surface of the aperture and thereby produces a magnetic field to induce eddy currents in an object located in the aperture. Variations in the eddy currents are detected and indicated. Greater flux densities for a given coil and current, lower coil inductance and short magnetic fields can be produced. A detector coil may encircle a monoturn member. A pair of monoturn members with encircling coils may be used in null-type instruments, and more than two may be employed if desired. Arrangements for testing hot objects and objects of noncircular cross-section are described, and also coil assemblies usable with different monoturn members having different aperture size or shape.
    • 使用一个或多个单向导电构件,其具有内孔和具有从孔延伸到环绕表面的狭槽的环绕表面。 提供有交流或脉冲电流的环绕线圈产生围绕孔的内表面的电流,从而产生磁场以在位于孔中的物体中引起涡流。 检测并指示涡流的变化。 可以产生给定线圈和电流,较低线圈电感和短磁场的较大磁通密度。 检测器线圈可以包围单体构件。 具有环绕线圈的一对单体构件可以用于空型仪器,如果需要,可以使用两个以上的单体。 描述了用于测试非圆形横截面的热物体和物体的布置,以及线圈组件可用于具有不同孔径尺寸或形状的不同单体构件。
    • 3. 发明授权
    • Pulse eddy current testing apparatus using pulses having a 50% duty cycle and precise quadrature gates
    • 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
    • US3852663A
    • 1974-12-03
    • US44114874
    • 1974-02-11
    • MAGNETIC ANALYSIS CORP
    • BROOKS RBEBICK P
    • G01N27/90G01R33/12
    • G01N27/9046
    • 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.
    • 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。