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US 8,947,243 B2Granted
Smoke detector with external sampling volume and utilizing internally reflected light
AssigneeValor Fire Safety, LLC
InventorMatthew Erdtmann
Life of this patent
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Abstract
In accordance with certain embodiments, a smoke detector comprises a housing, a light source, one or more light detectors, and an evaluation circuit for determining the presence of smoke particles outside the housing based on light emitted from and reflected back into the housing, as well as light emitted within the housing without emission therefrom.
Claims24
A smoke detector comprising:
- a housing;
- disposed within the housing, a light source configured to (i) emit a first light portion outside of the housing and (ii) emit a second light portion within the housing substantially without emission therefrom;
- disposed within the housing, one or more light detectors configured to receive light from the first light portion reflected back into the housing and light from the second light portion within the housing;
- and
- an evaluation circuit for determining the presence of smoke particles outside the housing based at least in part on (i) at least one of a luminance or a rate of change of luminance of light received from the first light portion and (ii) a luminance of light received from the second light portion.
2 more elements
Dependencies are inferred from the claim text.