Fire sensing device
AssigneeHoneywell International Inc.
InventorsBenjamin H. Wolf, Daniel D. Ascough, Michael Barson, Christopher Dearden
Life of this patent
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Abstract
A fire sensing device is described herein. One fire sensing device includes a first transmitter light-emitting diode (LED) configured to emit a first light, a second transmitter LED configured to emit a second light, a controller configured to command the first transmitter LED to cease emitting the first light and the second transmitter LED to start emitting the second light, and a photodiode configured to detect the first light and the second light.
Claims20
A fire sensing device, comprising:
- a first transmitter light-emitting diode (LED) configured to emit a first light;
- a second transmitter LED configured to emit a second light;
- a controller configured to command the first transmitter LED to cease emitting the first light and the second transmitter LED to start emitting the second light;
- and
- a photodiode configured to:
- detect the first light;
- and
- detect the second light.
A method for operating a fire sensing device, comprising:
- emitting, by a first transmitter light-emitting diode (LED) of the fire sensing device, a first light at a first duty cycle;
- detecting, by a photodiode of the fire sensing device, a scatter level of the first light;
- sensing a fire based on the scatter level of the first light;
- emitting, by a second transmitter LED of the fire sensing device, a second light at a second duty cycle, wherein the second duty cycle is less than the first duty cycle prior to sensing the fire, and wherein the second transmitter LED increases the second duty cycle responsive to sensing the fire;
- and
- detecting, by the photodiode, a scatter level of the second light.
A fire alarm system, comprising:
- a monitoring device;
- and
- a fire sensing device, comprising:
- a first transmitter light-emitting diode (LED) configured to emit a first light;
- a second transmitter LED configured to emit a second light, wherein the first transmitter LED and the second transmitter LED alternate emitting the first light and the second light;
- and
- a photodiode configured to:
- detect a scatter level of the first light;
- detect a scatter level of the second light;
- and
- transmit the detected scatter level of the first light and the detected scatter level of the second light to the monitoring device.
Dependencies are inferred from the claim text.