Optical smoke detectors

Details Optical smoke detectors Optical smoke detectors

1984-08-13

1987-12-22

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

362263, G01N 2153, F21V 704

Patent

active

047143479

ABSTRACT:
There is provided a flash reflector for maximizing the intensity of light passing into an air sampling chamber of a smoke detector which enables a reduction in power requirements for the light source. The reflector includes a concave reflecting element to focus light from each infinitesimal cross-sectional element off the arc of ionized gas in a flash tube the light output from the whole length of the tube which is optionally of U-shape being focused into the central region of the sampling chamber.

REFERENCES:
patent: 1275120 (1918-08-01), Ballman et al.
patent: 2501405 (1950-03-01), Noel
patent: 2731577 (1956-01-01), Floyd
patent: 3457407 (1969-07-01), Goldberg
patent: 3563661 (1971-02-01), Charlson et al.
patent: 3672775 (1972-06-01), Fruengel

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