Abstract
This paper presents the testing results of three types of fire detectors: electrical heat sensing cable, optical fiber Raman temperature sensing detector, and optical fiber Bragg grating (FBG) temperature sensing detector, in two simulated fire scenes in a cable tunnel. In the small-scale fire with limited thermal radiation and no flame, the fire alarm only comes from the heat sensors which directly contact with the heat source. In the large-scale fire with about 5 °C/min temperature rising speed within a 3-m span, the fire alarm response time of the fiber Raman sensor and FBG sensors was about 30 seconds. The test results can be further used for formulating regulation for early fire detection in cable tunnels.
Highlights
Along with the increasing importance of fire alarms in the modern industries and infrastructures, the investigation into fire detectors is becoming more desirable
There is temperature distribution in the surrounding area in a fire scene, and the response time of distributed fire detectors is affected by their spatial distribution
Due to the complexity of the fire scene in cable tunnels, there are many accidents caused by cable overheating, which have no reference for fire simulation specifications
Summary
Along with the increasing importance of fire alarms in the modern industries and infrastructures, the investigation into fire detectors is becoming more desirable. In cable tunnels, fiber Raman [2] and fiber Bragg grating (FBG) [3] temperature sensors have attracted much attention for fire detection because of their distributed measurement capability, high sensitivity, and fast response. There is temperature distribution in the surrounding area in a fire scene, and the response time of distributed fire detectors is affected by their spatial distribution. Due to the complexity of the fire scene in cable tunnels, there are many accidents caused by cable overheating, which have no reference for fire simulation specifications. In order to develop effective standards for early fire detection in cable tunnels, it is necessary to analyze the fire causes and characteristics, simulate fire scenes based on practical instances, and evaluate the viability and performance of the fire sensors
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