US 12,347,294 B2
Self-calibrating fire sensing device
Christopher Dearden, Melton Mowbray (GB); Michael Barson, Nuneaton (GB); and Benjamin Wolf, Leicester (GB)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Charlotte, NC (US)
Filed on Jun. 12, 2023, as Appl. No. 18/208,483.
Application 18/208,483 is a continuation of application No. 16/997,743, filed on Aug. 19, 2020, granted, now 11,676,466.
Prior Publication US 2023/0326315 A1, Oct. 12, 2023
Int. Cl. G08B 17/107 (2006.01); G01N 15/00 (2024.01); G01N 15/06 (2024.01); G01N 15/075 (2024.01); G08B 29/28 (2006.01)
CPC G08B 17/107 (2013.01) [G01N 15/06 (2013.01); G08B 29/28 (2013.01); G01N 2015/0046 (2013.01); G01N 15/075 (2024.01)] 19 Claims
OG exemplary drawing
 
1. A self-calibrating fire sensing device, comprising:
an adjustable particle generator and a variable airflow generator configured to generate aerosol at a controllable density level;
a transmitter light-emitting diode (LED) configured to emit a light that passes through the aerosol within the self-calibrating fire sensing device;
a photodiode configured to detect a scatter level of the light that passes through the aerosol; and
a controller configured to calibrate a gain of the photodiode based on the detected scatter level of the light.