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    • 3. 发明授权
    • Eddy current flaw detector method and apparatus having a rotatable high
permeability flux concentrator encircling a workpiece
    • 具有围绕工件的可旋转的高磁导率磁通集中器的涡流探伤仪方法和装置
    • US4683430A
    • 1987-07-28
    • US625033
    • 1984-06-27
    • Richard M. HarrisRichard F. Abramczyk
    • Richard M. HarrisRichard F. Abramczyk
    • G01N27/90G01N27/82G01R33/12
    • G01N27/9026G01N27/9013
    • Eddy current test apparatus of the type that generates eddy currents in an object and that senses flaws or defects by sensing changes in the induced eddy current. Two differential encircling coils surround a moving workpiece moving relative to said coils. One of the two test coils has an enclosed tubular pathway forming a loop adjacent to the coil. A steel ball is placed in the enclosed tubular pathway and is air driven through the pathway so that it continuously revolves in close proximity to the coil. The steel ball disrupts the magnetic field flux generated by the test coil in the workpiece. This disruption modifies the eddy current in the workpiece which in turn induces a well defined output signal in the test coil. In an alternate and preferred embodiment, two ferrite object are rotated near the two encircling coils to disrupt the eddy currents produced by both coils. The ferrite objects are radially offset so that they do not disrupt the magnetic field near a flaw at the same time.
    • 涡流测试装置,其在物体中产生涡流,并通过感测感应涡流的变化来感测缺陷或缺陷。 两个差动环绕线圈围绕相对于所述线圈移动的移动的工件。 两个测试线圈中的一个具有形成与线圈相邻的环的封闭的管状通路。 钢球放置在封闭的管状通道中,并通过通道进行空气驱动,使得其在线圈附近连续地旋转。 钢球破坏工件中测试线圈产生的磁场通量。 这种破坏改变了工件中的涡流,这反过来又引起了测试线圈中良好定义的输出信号。 在替代和优选实施例中,两个铁氧体物体在两个环绕线圈附近旋转以破坏由两个线圈产生的涡流。 铁氧体物体径向偏移,使得它们不会同时破坏缺陷附近的磁场。
    • 5. 发明授权
    • Electromagnetic flaw detection system and method incorporating improved
automatic coil error signal compensation
    • 电磁探伤系统和方法结合改进的自动线圈误差信号补偿
    • US4191922A
    • 1980-03-04
    • US886392
    • 1978-03-14
    • Richard M. HarrisWilbert J. Janos
    • Richard M. HarrisWilbert J. Janos
    • G01N27/90G01R33/12
    • G01N27/9046
    • An electromagnetic flaw detection system and method having automatic dynamic error balancing is disclosed.The system includes means for producing an alternating electromagnetic field and for passing a metallic workpiece to be tested along a path through the field. A differential detection coil is disposed in the field near the workpiece path. The coil responds to nonuniformities in the field caused by workpiece flaws, such as voids, to produce flaw indications. Detection circuitry actuates alarm apparatus in response to the flaw indications to further indicate need for corrective action.Automatic balancing circuitry compensates for an error signal, which the differential coil generates due to minute undesired assymmetries in the coil's mechanical structure. The balancing circuitry includes means for generating a reference signal. The reference signal is continually adjusted, in response to characteristics of the error signal, to exactly counterbalance the error signal in phase and amplitude. The coil's total output, including the error, and the adjusted reference signal, are summed at a location electrically separate from the coil to provide a flaw detection coil output in which the error is completely nulled out.
    • 公开了一种具有自动动态误差平衡的电磁探伤系统和方法。 该系统包括用于产生交变电磁场并使沿着通过该场的路径通过待测试的金属工件的装置。 差分检测线圈设置在工件路径附近的场中。 线圈响应由工件缺陷(如空隙)引起的场内不均匀性,以产生缺陷指示。 检测电路响应于缺陷指示启动报警装置,以进一步指示需要采取纠正措施。 自动平衡电路补偿误差信号,差分线圈由于线圈的机械结构中的微小不必要的不​​对称而产生。 平衡电路包括用于产生参考信号的装置。 响应于误差信号的特性,参考信号被连续地调整为在相位和幅度上精确地平衡误差信号。 线圈的总输出,包括误差和调整的参考信号,在与线圈电气分离的位置相加,以提供其中误差完全为零的探伤线圈输出。
    • 9. 发明授权
    • Cooling method and apparatus for eddy current flaw detection
    • 用于涡流探伤的冷却方法和装置
    • US4461995A
    • 1984-07-24
    • US316316
    • 1981-10-29
    • Richard M. Harris
    • Richard M. Harris
    • G01N27/90G01R33/12
    • G01N27/9006Y10S165/903
    • An eddy current system and method is disclosed for detecting flaws in hot pipe product. The system includes a detector test head (22) having a heat shield (24) defining a generally cylindrical inner wall through which the pipe passes longitudinally. The test head includes structure (50, 62, 64) for spirally directing water onto the inside surface without contacting the hot pipe as it passes through the heat shield. Debris is thereby removed from the space between the shield and the pipe, and the test head is effectively cooled and shielded from the heat of the pipe. Where the pipe is heated above its Curie temperature, such that the pipe is rendered non-magnetic, no normally required saturation coil is needed to magnetically saturate the pipe for eddy current testing, because the coolant flowing over the inner wall cools the test head but does not lower pipe temperature below the Curie point.
    • 公开了一种用于检测热管产品缺陷的涡流系统和方法。 该系统包括检测器测试头(22),该检测器测试头(22)具有限定大体上圆柱形的内壁的隔热罩(24),管道通过该外壁纵向延伸。 测试头包括用于将水螺旋地引导到内表面上的结构(50,62,64),而不在热管通过隔热罩时接触热管。 因此,从屏蔽和管道之间的空间去除碎屑,并且有效地冷却和测试测试头与管道的热量。 在管道被加热到高于其居里温度的情况下,使得管道变得非磁性,不需要通常需要的饱和线圈来使管道磁饱和以进行涡流测试,因为流过内壁的冷却剂冷却测试头,但是 不会将管道温度降低到居里点以下。