Radiant energy – Invisible radiant energy responsive electric signalling
Reexamination Certificate
2007-03-06
2007-03-06
Porta, David (Department: 2884)
Radiant energy
Invisible radiant energy responsive electric signalling
C250S339150, C250S339130, C250S339010, C250S339120, C340S328000, C340S627000, C340S629000
Reexamination Certificate
active
11317266
ABSTRACT:
A fire detector with a passive CO2sensor generates a detector signal based upon a 15μ absorption band of CO2and a signal processor generates an alarm signal when a preselected criterion is met. The passive CO2sensor has a passive infrared source with a source temperature, a waveguide sample chamber with a gas medium temperature (which is less than the source temperature), a heat exchanger (that reduces the temperature of CO2gas as it passes into the waveguide sample chamber and may be thermally coupled to the sample chamber) and an infrared detector assembly with a detector temperature (which is less than the source temperature). An exterior surface of the passive infrared source has a high emissivity while the detector assembly and the sample chamber (which can be thermally coupled to each other but not the passive infrared source) have a low emissivity.
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Airware, Inc.
Anderson Roy L.
Malevic Djura
Porta David
Wagner, Anderson & Bright LLP
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