Electricity: electrical systems and devices – Miscellaneous
Patent
1981-02-23
1982-08-17
Goldberg, Elliot A.
Electricity: electrical systems and devices
Miscellaneous
733365, 361286, 361405, H05K 118, H01G 700
Patent
active
043453015
ABSTRACT:
A capacitive humidity transducer having an electrically non-conductive dielectric base carrying a pair of electrically conductive coatings deposited directly on opposite respective sides of the non-conductive base to form parallel capacitor plates. The conductive coatings are each arranged in a configuration of a plurality of side-by-side forked legs with the legs of the electrically conductive elements being positioned in a facing relationship. One end of each of the electrically conductive coatings is provided with electrical connectors for attaching the transducer to respective electrically conductive circuits which may be on a printed circuit board. The dielectric base is arranged to be hygroscopic whereby atmospheric humidity provides a corresponding variation in the dielectric constant of the base to affect the capacitance of the transducer.
REFERENCES:
patent: 1708073 (1929-04-01), Allen
patent: 1899176 (1933-02-01), Bailey
patent: 4164868 (1979-08-01), Suntola
patent: 4305112 (1981-12-01), Heywang
Channon A thick, "Film Humidity Sensor", in Conf. on Hybrid Microelectronics, Loughborough, Leis, England, 9/9/75, pp. 57-62.
Thoma, "A Capacitance Humidity Sensing Transducer", in IEEE Transactions on Components, Hybrids & Manufacturing Technology, vol. CHMT-2, #3, 9/79, pp. 321-323.
Burton Lockwood D.
Goldberg Elliot A.
Halista Mitchell J.
Honeywell Inc.
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