Optical smoke detector operating in accordance with the extincti

Details Optical smoke detector operating in accordance with the extincti Optical smoke detector operating in accordance with the extincti

1998-06-12

1999-02-16

Kin, Robert

Optics: measuring and testing

For light transmission or absorption

Of fluent material

250575, 356394, G01N 2100

Patent

active

058726349

ABSTRACT:
The smoke detector includes a light source (1), a measurement section (3) with a measuring receiver (5), a reference section (2) with a reference receiver (4), and an analyzer circuit (6) connected to the receivers. The receivers are of like construction and receive like amounts of radiation from the light source (1). A difference signal (.DELTA.I) formed from the current signal (I.sub.r) of the reference receiver and the current signal (I.sub.m) of the measuring receiver is fed to the analyzer circuit. A reference current (I.sub.k) is superimposed upon the current signal (I.sub.r) of the reference receiver, and the light source is connected to a control circuit and regulated by the control circuit for compensation of the reference current (I.sub.k) by the reference current signal (I.sub.r). The difference signal (.DELTA.I) is superimposed with a compensation signal (I.sub.k ') for zero compensation.

REFERENCES:
patent: 5381130 (1995-01-01), Thuillard et al.
patent: 5694208 (1997-12-01), Ichikawa
patent: 5751216 (1998-05-01), Narumiya

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