Two Applications of FBG Temperature Sensor for Environmental Safety
Abstract
Detection and monitoring of temperature in fire sensitive areas, high temperature zones such as underground coal mines and smelting plant applications is a crucial requirement in order to ensure safety of working personnel and to avoid unnecessary damage to life and infrastructure. Underground coal mine fire mostly occurs due to smoldering combustion. The temperature gradient is one of the most important factors for detecting underground fire. Similarly smelting plants as mandated in various stages of aluminium production starting from the mixing stage typically having 160oC-180oC to the alumina electrolysis process that is characterized by about 1000°C.Therefore, detection and subsequent monitoring of temperature change in underground coal mines as well as smelting plants is an important concern. We have proposed and demonstrated a four channel FBG temperature sensor based system, where multiple FBG sensors sense different temperatures and the sensed data is transmitted through a single channel by using wavelength division multiplexing (WDM). At the receiver side a WDM demultiplexer is used to retrieve the originally transmitted signal.The performance of WDM-FBG sensor system has been compared in three different channels such as Optical fiber cable (OFC), Free Space Optics (FSO) and Optical Wireless communication (OWC) channels.
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