Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1994-12-08
1996-02-20
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
219707, H05B 668
Patent
active
054931193
ABSTRACT:
A smoke and vapour detector for microwave ovens comprises a light transmitter (12) and two light receivers (13, 14) arranged in a housing (11) through which air from the microwave chamber flows during a heating procedure. One receiver (13) is designed to receive direct light from the transmitter (12), and the other receiver (14) is designed to receive indirect or scattered light from the interior of the housing (11). The signals from the receivers are differentiated and subtracted from one another in order to generate a difference signal indicating the presence of smoke or water vapour in the chamber air.
REFERENCES:
patent: 4383158 (1983-05-01), Niwa
patent: 4496817 (1985-01-01), Smith
Hannaher Constantine
Rice Robert O.
Whirlpool Europe B.V.
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