Scattered light type smoke detector

Details Scattered light type smoke detector Scattered light type smoke detector

1984-03-30

1986-06-24

Rosenberger, R. A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356337, 250574, 340630, G01N 1506, G08B 1700

Patent

active

045964653

ABSTRACT:
A scattered light type smoke detector wherein a light source and a photo-cell are so disposed that light from the light source does not directly enter the photo-cell and the photo-cell is adapted to receive light from the light source scattered by intervening smoke to detect the presence of smoke. The photo-cell is accommodated in a cylindrical recess formed in a smoke detecting holder. The inner face of the cylindrical recess and the surface of the smoke detecting holder extending along the optical axis of the photo-cell has light traps formed in sawteeth configuration in section for reflecting light other than the scattered light to be detected into a direction not towards the photo-cell.

REFERENCES:
patent: 4216377 (1980-08-01), Hasegawa et al.
patent: 4397557 (1983-08-01), Herwig et al.

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