Moisture sensor and method of fabrication thereof

Details Moisture sensor and method of fabrication thereof Moisture sensor and method of fabrication thereof

1989-03-20

1990-11-13

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Composite

Of quartz or glass

428428, 428432, 428913, 296 841, 296 974, B32B 1706, B60J 102

Patent

active

049701223

ABSTRACT:
A moisture sensor consists of an array of spaced apart, highly abrasion-resistant electrodes disposed on the outside surface of the windshield of a vehicle. When moisture is present, the spaces between the electrodes are bridged by the water and the output impedance of the sensor significantly decreases. This signals the presence of moisture. The electrodes have particles of a conductive metal oxide, e.g., ruthenium oxide, dispersed with a glass matrix which is fused to the windshield glass. The electrodes are formulated as an ink including particles of the metal oxide, a glass frit, and an organic binder. The ink is silk screened onto the windshield in the desired electrode pattern. After drying of the ink, the glass frit is fused to the windshield during normal heating of the windshield to shape it in a known windshield shaping (sagging) process. Novel two layer sensor arrangements, providing even greater resistance to abrasion, are also described.

REFERENCES:
patent: 2877329 (1959-03-01), Gaiser
patent: 3684569 (1972-08-01), Milgram
patent: 3864659 (1975-02-01), Furuuchi
patent: 3989874 (1976-11-01), Maher
patent: 4109377 (1978-08-01), Blazick et al.
patent: 4362656 (1982-12-01), Hormadaly
patent: 4554493 (1985-11-01), Armstrong
patent: 4655811 (1987-04-01), Bitter
patent: 4665351 (1987-05-01), Nyberg
patent: 4718932 (1988-01-01), Pharms

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