A method for distinguishing between an alarm condition and a nuisance condition in a smoke detector. The smoke detector comprises an illuminator and a light sensor. The method includes measuring a voltage signal in response to an electromagnetic signal emitted by the illuminator, and comparing the voltage signal to an alarm threshold. A rate of change of the voltage signal is determined in response to the comparison of the voltage signal and the alarm threshold. A first frequency component of a first portion of the voltage signal and a second frequency component of a second portion of the voltage signal is determined. The first frequency component and the second frequency component are compared to distinguish between the alarm condition and the nuisance condition. An indication of the alarm condition and the nuisance condition is respectively generated upon an identification of the alarm condition and the nuisance condition.
Smoke detector for distinguishing between an alarm condition and a nuisance condition
10.07.2018
Patent
Elektronische Ressource
Englisch
Engineering Index Backfile | 1909
|Design of stacks to minimize smoke nuisance
Engineering Index Backfile | 1946
|Design of stacks to minimize smoke nuisance
Engineering Index Backfile | 1947
|