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    WETNESS SENSOR USING RF CIRCUIT WITH FRANGIBLE LINK
    1.
    发明申请
    WETNESS SENSOR USING RF CIRCUIT WITH FRANGIBLE LINK 审中-公开
    无线传感器使用RF电路与可变链路

    公开(公告)号：US20150148762A1

    公开(公告)日：2015-05-28

    申请号：US14613469

    申请日：2015-02-04

    Applicant: 3M INNOVATIVE PROPERTIES COMPANY

    Inventor： Justin M. Johnson ,  Lori-Ann S. Prioleau ,  Brinda B. Badri ,  James C. Vanous ,  Robert D. Lorentz ,  Jacob D. Chatterton ,  Steven J. Perron ,  Donald R. Battles

    IPC: A61F13/42 ,  G01N27/22

    CPC classification number: A61F13/42 ,  A61F2013/424 ,  G01N27/223

    Abstract: A wetness sensor includes a substrate that carries a tuned RF circuit. The circuit includes a conductive pattern applied to the substrate, a capacitor, and a jumper all disposed on a same side of the substrate. The conductive pattern includes an inductive coil, and an inner and outer terminus. The jumper electrically couples the inner terminus to the outer terminus. The jumper also includes a frangible link which, when contacted by a target fluid, produces a drastic change in the operation of the RF circuit. The drastic change can be interpreted by a remote reader as a “wet” condition. Contact of the frangible link by the target fluid may change the impedance or resistance of the RF circuit by at least a factor of 5, 10, 100, or more, and/or may cause the frangible link to disintegrate to produce an open circuit, and/or may substantially render the RF circuit inoperative.

    Abstract translation: 湿度传感器包括承载调谐RF电路的基板。 电路包括施加到衬底的导电图案，电容器和全部设置在衬底的同一侧上的跳线。 导电图案包括感应线圈，以及内外端。 跳线将内部终端电连接到外部终端。 跳线还包括一个易碎的连接，当与目标流体接触时，它产生了RF电路的操作的剧烈变化。 远程读取器可以将剧烈的变化解释为“湿”状态。 通过目标流体的易断裂连接的接触可以将RF电路的阻抗或电阻改变至少5,10,100或更多的因子，和/或可以使易碎连杆分解以产生开路， 和/或可以基本上使得RF电路不起作用。

    WETNESS SENSORS
    3.
    发明申请
    WETNESS SENSORS 审中-公开

    公开(公告)号：US20170252227A1

    公开(公告)日：2017-09-07

    申请号：US15598464

    申请日：2017-05-18

    Applicant: 3M INNOVATIVE PROPERTIES COMPANY

    Inventor： Lori-Ann S. Prioleau ,  Justin M. Johnson ,  Robert D. Lorentz ,  Brinda B. Badri ,  James C. Vanous ,  Jacob D. Chatterton ,  Steven J. Perron ,  Donald R. Battles ,  Badri Veeraraghavan

    IPC: A61F13/42

    CPC classification number: A61F13/42

    Abstract: A wetness sensor includes a self-supporting substrate and an electrically conductive trace carried by the substrate. The trace is patterned to provide at least a portion of a tuned RF circuit, which may be disposed on only one side of the substrate and characterized by an impedance or resistance. The trace is not self-supporting. The substrate is adapted to dissolve, swell, or otherwise degrade when contacted by a target fluid. Such degradation produces a drastic change in the operation of the RF circuit, which can be interpreted by a remote reader as a “wet” condition. Contact of the substrate by the target fluid may change the impedance or resistance of the RF circuit by at least a factor of 5, 10, 100, or 1000, and/or may cause the trace to disintegrate so as to provide the RF circuit with an open circuit, and/or may substantially render the RF circuit inoperative.

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