Title:
MOISTURE DETECTION SYSTEM AND METHOD OF USE THEREOF
Document Type and Number:
WIPO Patent Application WO2004050442
Kind Code:
A3
Abstract:
A moisture detection system includes an electrical conductor disposed on a surface of a substrate. The electrical conductor has a resonant frequency that varies as a function of an amount of moisture present adjacent the electrical conductor. An oscillator outputs an oscillator signal at a predetermined amplitude and a predetermined frequency. A resonator circuit is coupled to the electrical conductor and is responsive to the oscillator signal and the resonant frequency of the electrical conductor for outputting a resonator signal having an amplitude related to the resonant frequency of the electrical conductor. A filter circuit rectifies and filters the resonator signal and provides it to an analog-to-digital converter which outputs a digital signal related to the rectified and filtered resonator signal. A controller is responsive to the digital signal for causing a system associated with the substrate to operate in accordance with the digital signal.
Inventors:
BARGUIRDJIAN PASCAL
HAIGRON MICHEL
HAWK ALLAN REX
KORAM KWAKU KOI
HAIGRON MICHEL
HAWK ALLAN REX
KORAM KWAKU KOI
Application Number:
PCT/US2003/038250
Publication Date:
December 16, 2004
Filing Date:
December 02, 2003
Export Citation:
Assignee:
PPG IND OHIO INC (US)
International Classes:
B60S1/08; G01F23/26; G01N27/02; G01N25/56; (IPC1-7): B60S1/08; G01N27/02
Domestic Patent References:
| WO2003074334A1 | 2003-09-12 | |||
| WO1991018757A1 | 1991-12-12 |
Foreign References:
| US4703237A | 1987-10-27 | |||
| US4748390A | 1988-05-31 | |||
| US5672976A | 1997-09-30 | |||
| US4560923A | 1985-12-24 | |||
| US5602333A | 1997-02-11 | |||
| US4323726A | 1982-04-06 | |||
| US4100398A | 1978-07-11 |
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