Smoke detector

Details Smoke detector Smoke detector

1977-03-14

1979-11-27

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

250227, 250574, 340630, 356439, G01N 2126

Patent

active

041758650

ABSTRACT:
An optical smoke detector comprising a radiation source transmitting radiation throughout a predetermined spatial region and at least one radiation receiver to which there is delivered the radiation scattered by particles located in the radiation region. One or a number of elements conducting radiation by reflection are provided and arranged such that they remove radiation, which has been forwardly scattered at an acute angle with respect to the radiation direction, at a substantially ring-shaped zone about the region of direct radiation and delivers such removed forwardly scattered radiation to the radiation receiver.

REFERENCES:
patent: 3310680 (1967-03-01), Hasegawa
patent: 3708675 (1973-01-01), Tashiro et al.
patent: 3790289 (1974-02-01), Schmidt
patent: 3806256 (1974-04-01), Ishak
patent: 3878399 (1975-04-01), Higuchi et al.
patent: 3986778 (1976-10-01), Mathisen et al.
patent: 3990851 (1976-11-01), Gross et al.
patent: 4017186 (1977-04-01), Shofner et al.

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