Patent ID: 7296461
Filing Date: 2007-11-20
Classification: B32B,B60S,G01N

Abstract:
1. A moisture detection system comprising: an electrical conductor disposed on a surface of a substrate and having a resonant frequency that varies as a function of an amount of moisture present adjacent the electrical conductor; an oscillator which outputs an oscillator signal at a predetermined amplitude and a predetermined frequency; a resonator circuit coupled to the electrical conductor and responsive to the oscillator signal for outputting a resonator signal having an amplitude related to the resonant frequency of the electrical conductor; a filter circuit responsive to the resonator signal for outputting a rectified and filtered signal; an analog-to-digital converter responsive to the rectified and filtered signal for outputting a digital signal related to the rectified and filtered signal; a sensor having a property that varies as a function of a temperature at or adjacent the electrical conductor; and a controller responsive to the digital signal and the property of the sensor for causing another system to operate as a function thereof.