Optical smoke detector with smoke effect simulating means

Details Optical smoke detector with smoke effect simulating means Optical smoke detector with smoke effect simulating means

1976-01-07

1977-10-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250209, 250575, 340237S, G01N 2126

Patent

active

040537854

ABSTRACT:
Smoke detection apparatus including a pair of photoelectric cells which receive illumination in a predetermined ratio from a very low level light source. An improved simulating device is included for the purpose of testing the correct functioning of the alarm system connected to a sensing circuit formed by the photocells. The effects normally produced by smoke present in a chamber are simulated by selectively directing light from an auxiliary light source onto the sensing or "reflected" cell in the sensing circuit. In addition, a specially designed and constructed sensor head is provided for avoiding discrepancies in the placement of the critical elements; moreover, improved flow of any smoke present is promoted by the specific geometry of the sensor head. Also, discrepancies between the desired and actual ratio of illumination received by the respective photocells can be readily adjusted for electrically, and the light ratio between photocells can be changed by suitably adjusting the degree of illumination received by the direct cell.

REFERENCES:
patent: 3518437 (1970-06-01), Riggs
patent: 3787703 (1974-01-01), Topol
patent: 3863076 (1975-01-01), Steele et al.
patent: 3868184 (1975-02-01), Marsocci
patent: 3882477 (1975-05-01), Mueller
patent: 3892485 (1975-07-01), Merritt et al.
patent: 3901812 (1975-08-01), Hallengren

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