Patent ID: 6222376
Filing Date: 2001-04-24
Classification: G01N

Abstract:
A capacitive moisture sensor, comprising:(a) a non-conductive substrate;(b) a first electrode deposited on said substrate;(c) a first moisture sensitive porous dielectric film covering and protecting said first electrode, including the edges thereof, from exposure to non-vaporous contaminants;(d) a second electrode deposited on said first moisture sensitive porous dielectric film;(e) a second moisture sensitive porous dielectric film covering and protecting said second electrode, including the edges thereof, from exposure to non-vaporous contaminants;(f) a third electrode deposited on said second moisture sensitive porous dielectric film, said third electrode being electrically coupled to said first electrode;(g) a first electrical contact for said sensor, said first electrical contact being electrically coupled to said first electrode and said third electrode; and(h) a second electrical contact electrically coupled to said second electrode.