Detectionand 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. Smoldering combustion is most often responsible for underground coal mine fire. A commonly used method for detection of underground fire can be done through temperature gradient.Similarly smelting plants as mandated in various stages of aluminium production starting from the mixing stage typically having 160 o C-180 o C 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. A four channel FBG temperature sensor based system is proposed in this paper that demonstrates multiple FBG sensors. These four sensors sense different temperatures and a single channel making use of wavelength division multiplexing (WDM) is used thereafter to send the sensed data. A WDM demultiplexer is used to retrieve the originally transmitted signal at the receiver. Three different channels such as Optical fiber cable (OFC), Free Space Optics (FSO) and Optical Wireless communication (OWC) channels have been simulated here to assess and compare the performance of the proposed WDM-FBG sensor system.
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