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
申请号：
US13207522
公开号：
US20130041334A1
申请日:
2011.08.11
申请国别(地区):
US
年份:
2013
代理人:
摘要：
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.
