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    • 9. 发明授权
    • Surface mounted and scanning spatially periodic eddy-current sensor arrays
    • 表面安装和扫描空间周期性涡流传感器阵列
    • US06952095B1
    • 2005-10-04
    • US09666524
    • 2000-09-20
    • Neil J. GoldfineDarrell E. SchlickerAndrew P. WashabaughVladimir A. ZilbersteinVladimir Tsukernik
    • Neil J. GoldfineDarrell E. SchlickerAndrew P. WashabaughVladimir A. ZilbersteinVladimir Tsukernik
    • G01B7/24G01B7/34G01N27/90G01R33/12G01N27/82G01N27/72
    • G01N27/72G01B7/24G01B7/34G01N27/90G01N27/902G01R33/12
    • Inductive sensors measure the near surface properties of conducting and magnetic material. A sensor may have primary windings with parallel extended winding segments to impose a spatially periodic magnetic field in a test material. Those extended portions may be formed by adjacent portions of individual drive coils. Sensing elements provided every other half wavelength may be connected together in series while the sensing elements in adjacent half wavelengths are spatially offset. Certain sensors include circular segments which create a circularly symmetric magnetic field that is periodic in the radial direction. Such sensors are particularly adapted to surround fasteners to detect cracks and can be mounted beneath a fastener head. In another sensor, sensing windings are offset along the length of parallel winding segments to provide material measurements over different locations when the circuit is scanned over the test material. The distance from the sensing elements to the ends of the primary winding may be kept constant as the offset space in between sensing elements is varied. An image of the material properties can be provided as the sensor is scanned across the material.
    • 感应传感器测量导电和磁性材料的近表面性质。 传感器可以具有平行延伸的绕组段的初级绕组,以在测试材料中施加空间周期的磁场。 这些延伸部分可以由各个驱动线圈的相邻部分形成。 每隔一半波长提供的感测元件可以串联连接在一起,而相邻半波长中的感测元件在空间上偏移。 某些传感器包括产生在径向周期性的圆形对称磁场的圆形段。 这种传感器特别适于围绕紧固件以检测裂缝并且可以安装在紧固件头部下方。 在另一个传感器中,感测绕组沿着平行绕组段的长度偏移,以便在电路扫描测试材料时,通过不同位置提供材料测量。 当感测元件之间的偏移空间变化时,从感测元件到初级绕组的端部的距离可以保持恒定。 当传感器跨越材料扫描时,可以提供材料特性的图像。