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    • 1. 发明授权
    • Electromagnetic acoustic transducer (EMAT) system and method for
eliminating noise produced by static discharge
    • 电磁声换能器(EMAT)系统及消除静电放电噪声的方法
    • US6070467A
    • 2000-06-06
    • US953081
    • 1997-10-17
    • Jeffrey S. RosenbergMark LandPat Cook
    • Jeffrey S. RosenbergMark LandPat Cook
    • B06B1/04G01N29/24G01N9/24G01N29/00H04R23/00
    • B06B1/04G01N29/2412
    • The present invention allows for the fabrication of an EMAT system that eliminates static charge impulse noise. The EMAT system includes an EMAT, wear layer, and magnet. If the wear layer is made slightly conductive, the static charges slowly bleed off rather than build up to cause impulse discharges. This semiconductive wear layer does not attenuate the EMAT signals by introducing any additional distance between the EMAT coil and the conductive piping or by introducing any conductive material between the EMAT coil and the conductive piping. In the preferred embodiment, a wear layer of UHMW (ultra high molecular weight) polyethylene with a surface resistivity of about 10,000 ohms per square is utilized. The conductive UHMW polyethylene still acts as a wear layer, but now also acts as a semi-conductive static-dissipative interface between the EMAT coil and the piping.
    • 本发明允许制造消除静电荷脉冲噪声的EMAT系统。 EMAT系统包括EMAT,耐磨层和磁铁。 如果磨损层略微导电,静电荷会缓慢渗出而不是积聚起来引起脉冲放电。 该半导体耐磨层不会通过在EMAT线圈和导电管道之间引入任何附加距离或者在EMAT线圈和导电管道之间引入任何导电材料来衰减EMAT信号。 在优选的实施方案中,使用表面电阻率为约10,000欧姆/平方的UHMW(超高分子量)聚乙烯的耐磨层。 导电UHMW聚乙烯仍然作为耐磨层,但现在也作为EMAT线圈和管道之间的半导体静电消散界面。