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How long will a smoke detector chirp before it dies? 

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CONTEXT Seventy percent of U. S. residential fire deaths occur in homes without a working smoke detector.
Alarm algorithms utilizing ionization detector smoke measurements proved to be more effective than measurements from photoelectric detectors.
Such a detector will operate at low voltages and be rather insensitive to gamma background and neutron radiation damage.
Considering that the operating conditions of smoke detectors are affected by the detector type, combustibles, smoke particulars, and color, the database (DB) on the input parameters for various detectors and combustibles should be built to improve the reliability of PBD in future studies.
Theoretical analysis and simulation results prove that the proposed detector has high detection capability for a range of chirp slopes in a low-SNR environment.
It does not presume to report a unique “critical velocity” for all smoke detectors, but suggests that such a value may indeed exist, but with differing values among different smoke detectors.
It generates more accurate chirp rate estimation especially under a low signal-to-noise ratio.
It appears worthwhile to explore the actual use of a chirp because significantly shorter test and analysis times might be possible.
The various measurements of the chirp parameter are in reasonable agreement.

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