Fiber optic temperature sensors in a distributed smoke detection system
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United States of America Patent
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Aug 23, 2022
Grant Date -
Nov 26, 2020
app pub date -
May 20, 2019
filing date -
May 20, 2019
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A smoke and temperature detection system includes a plurality of fiber optic cables terminating in a plurality of nodes positioned to monitor a fire or smoke condition at one or more protected spaces, and a temperature detection fiber optic cable having a plurality of fiber Bragg gratings arrayed along the temperature detection fiber optic cable. A control system is operably connected to the plurality of fiber optic cables and to the temperature detection fiber optic cable. The control system includes a first light sensitive device configured to receive a scattered light signal from the plurality of fiber optic cables, and a second light sensitive device configured to receive a reflected light signal from the fiber Bragg gratings. The control system is configured to detect a temperature at the fiber Bragg gratings based on one or more properties of the reflected light signal received at the second light sensitive device.
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