Smoke alarm with temporal evaluation of a backscatter signal, test method for the functional capability of a smoke alarm

A smoke alarm has a base element with a flat mounting surface, a light emitter that is attached to the mounting surface and that is configured to issue an illuminating light, and a light receiver that is attached to the mounting surface next to the light emitter and that is configured to receive a m...

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Bibliographic Details
Main Authors TENCHIO GEORGES A, VOLLENWEIDER WALTER, MUELLER KURT, LOEPFE MARKUS
Format Patent
LanguageEnglish
Published 19.11.2013
Subjects
ALARM SYSTEMS
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
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Summary:A smoke alarm has a base element with a flat mounting surface, a light emitter that is attached to the mounting surface and that is configured to issue an illuminating light, and a light receiver that is attached to the mounting surface next to the light emitter and that is configured to receive a measurement light that results from a back-scattering of the illumination light at a measurement object located in a detection space. A data processing device is coupled to an output of the light receiver and configured to evaluate temporal changes of an output signal issued by the light receiver. Also, there is provided a method for checking the functional capability of the smoke alarm.
Bibliography:Application Number: US20090735845