Smoke detector with bimetallic element for temperature compensat

Details Smoke detector with bimetallic element for temperature compensat Smoke detector with bimetallic element for temperature compensat

1978-10-16

1980-12-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356338, G01N 1506

Patent

active

042412820

ABSTRACT:
A smoke detector having a radiation source operating in the infrared, visible or ultraviolet wavelength region, transmitting radiation throughout an expanded or extended solid angle region of predetermined minimal extent. A radiation receiver is arranged externally of this radiation region for the reception of radiation which has been scattered at smoke particles and for signal transmission upon exceeding a predetermined smoke density. To compensate for decrease in smoke sensitivity of the smoke detector with temperature increase there is provided a bimetallic strip which, in the presence of a temperature increase, gradually moves into a small part of the radiation region and causes an additional irradiation of the radiation receiver. By suitable selection and arrangement of the bimetallic element the smoke sensitivity remains almost constant up to a predetermined critical temperature, or the smoke sensitivity gradually increases with increasing temperature.

REFERENCES:
patent: 3430220 (1969-02-01), Deuth
patent: 3992102 (1976-11-01), Kajii

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