Apparatus for sensing dew and frost

Details Apparatus for sensing dew and frost Apparatus for sensing dew and frost

1982-09-27

1985-06-11

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

G01R 2702

Patent

active

045231427

ABSTRACT:
An apparatus for sensing dew and frost, comprising a sensing portion which includes a substrate (1) having less permittivity than ice and includes a pair of electrodes (2, 3) arranged to touch the substrate (1) and further includes a resistive film (4) on the substrate (1) covering the pair of electrodes (2, 3), the impedance between the pair of electrodes (2, 3) changing in three states, or dry, bedewed and frosted states.

REFERENCES:
patent: 2435895 (1948-02-01), McIlaine
patent: 3226610 (1965-12-01), Harman, Jr. et al.
patent: 3696360 (1972-10-01), Gajewski
patent: 3757212 (1973-09-01), Johnson
patent: 3873927 (1975-03-01), Overall
patent: 4023094 (1977-05-01), Adams
patent: 4227411 (1980-10-01), Abramovich
patent: 4270085 (1981-05-01), Terada et al.
patent: 4272986 (1981-06-01), Lowry et al.
patent: 4281286 (1981-07-01), Briggs

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