Optical frost sensor

Details Optical frost sensor Optical frost sensor

2008-03-04

2008-03-04

Jiang, Chen Wen (Department: 3744)

Refrigeration

Automatic control

By accumulation on freezing surface, e.g., ice

C062S128000, C340S583000

Reexamination Certificate

active

11033249

ABSTRACT:
The present invention relates to a device and method for operating a fully automatic, “on demand” refrigeration defrost cycle and controlling the frost build-up on the evaporative surfaces of both medium temperature (above freezing), and low temperature (below freezing) refrigeration devices or on any system or device requiring control by optical contrast.

REFERENCES:
patent: 3377817 (1968-04-01), Petranek
patent: 3961495 (1976-06-01), Beauvent et al.
patent: 4045971 (1977-09-01), Brenner, Jr.
patent: 4232528 (1980-11-01), Behr
patent: 4450691 (1984-05-01), Taylor
patent: 4593533 (1986-06-01), Alsenz
patent: 5514248 (1996-05-01), Okuda et al.

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