Passive NDIR gas sensor fire detector

Details Passive NDIR gas sensor fire detector Passive NDIR gas sensor fire detector

2007-02-13

2007-02-13

Porta, David (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

C250S339150, C250S339130, C250S339010, C250S339120, C340S328000, C340S627000, C340S629000

Reexamination Certificate

active

11367439

ABSTRACT:
A fire detector and method for detecting fires uses a passive NDIR sensor that generates a detector signal based upon either a 15μ absorption band of CO2or a 6.27μ absorption band of H2O and a signal processor which receives the detector signal and generates an alarm signal when a preselected criterion is met. The NDIR sensor relies upon a passive infrared source (such as a very thin film of black plastic material) with a high emissivity (e.g., approximately 1.0), a sample chamber with a low emissivity (e.g., approximately 0.03) thermally decoupled from the passive infrared source and an infrared detector located in a detector assembly thermally coupled to the sample chamber while a heat exchanger is thermally coupled to the sample chamber. Gas entering the sample chamber passes through the heat exchanger and both it and the infrared detector are at a lower temperature than that of the passive infrared source at an onset of a fire while the difference in temperatures between the passive infrared source and the detector increases during the onset of the fire. The sample chamber and the heat exchanger can be formed integrally from aluminum and their internal surfaces may be coated with a hydrophobic membrane.

REFERENCES:
patent: 5486810 (1996-01-01), Schwarz
patent: 5721430 (1998-02-01), Wong
patent: 5800360 (1998-09-01), Kisner et al.
patent: 5966077 (1999-10-01), Wong
patent: 6166647 (2000-12-01), Wong
patent: 2005/0092067 (2005-05-01), Petrovic et al.

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