Ultra low power NDIR carbon dioxide sensor fire detector
US7214939B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 2005 |
| Grant date | May 8, 2007 |
| Priority date | — |
| Expiry date | Nov 21, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/3137
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fire detector and method for generating an alarm signal in response to a fire uses an NDIR CO2 sensor to generate a detector signal based upon a 15μ absorption band of CO2 and generates an alarm signal when a signal processor receives the detector signal and a preselected criterion is met that is indicative of the onset of a fire based upon an analysis of the detector signal using a detection algorithm that relies upon a trending pattern of the detector signal such as recognizing a substantial drop in the detector signal strength. The NDIR CO2 sensor can also generate a reference detector signal based upon a 9.0μ neutral band with a FWHM=0.5μ while the signal processor utilizes a detection algorithm that is based upon a synchronized output signal representative of CO2 concentration to generate an alarm signal when a preselected criterion indicative of the onset of a fire is met.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.