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Optically powered gas monitoring system using single-mode fibre for underground coal mines

International Journal of Coal Science & Technology 2022年第2期9卷 36-47页

作者： Yingge Chen leonardo silvestri Xinyue Lei François Ladouceur School of Electrical Engineering and Telecommunications University of New South WalesSydneyNSW 2052Australia

We present an optically powered,intrinsically safe gas monitoring system to measure four essential environmental gases(CH_(4),CO_(2),CO and O_(2)),together with ambient temperature and pressure,for underground *** system is based on three key technologies developed at UNSW:(1)power-over-fbre(PoF)at 1550 nm using a single industry-standard,low-cost single-mode fbre(SMF)for both power delivery and information transmission,(2)liquid–crystal-based optical transducers for optical telemetry,and(3)ultra-low power consumption design of all ***,this approach allows each gas monitoring station to operate with less than 150 mW of optical power,meeting the intrinsic safety requirements specifed by the IEC60079-28 standard.A 2-month feld trial at BMA’s Broadmeadow underground mine proved the cabling compatibility to the mine’s existing optical network and the stability of the system *** with conventional electrically powered gas sensors,this technology bypasses the usual roadblocks of underground gas monitoring where electrical power is either unsafe or ***,using one fbre for both power delivery and communication enables longer distance coverage,reduces optical cabling and increases multiplexing possibilities and data throughput for better awareness of underground environment.

关键词： Power-over-fbre Ultra-low power consumption Gas monitoring Intrinsic safety Single-mode fbre Optical transducer

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Liquid Crystal-Based Hydrophone Arrays

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Photonic Sensors 2012年第3期2卷 237-246页

作者： Zourab BRODZEL leonardo silvestri Andrew MICHIE Vladimir G. CHIGRINOV Qi GUO Eugene R POZHIDAEV Alexei D. KISELEV Francois LADOUCEUR School of Electrical Engineering and Telecommunications UNSW Sydney NSW 2052 Australia Smart Digital Optics Pry. Ltd. Suite 145 National Innovation Centre 4 Cornwallis Street Australian Technology ParkEveleigh NSW Australia 2015 CDR Department of Electrical and Electronic Engineering The Hong Kong University of Science and TechnologyClear Water Bay Kowloon Hong Kong China p.N. Lebedev Physics Institute of Russian Sciences Leninsky Prospect 53 117924 Moscow Russia Institute of Physics of National Academy of Sciences of Ukraine Prospekt Nauki 46 03028 Kyǐv Ukraine

We describe a fiber optic hydrophone array system that could be used for underwater acoustic surveillance applications （e.g. military, counter terrorist, and customs authorities in protecting ports and harbors）, offshore production facilities or coastal approaches as well as various marine applications. In this paper, we propose a new approach to underwater sonar systems using the voltage-controlled liquid crystals and simple multiplexing method. The proposed method permits measurement of sound under water at multiple points along an optical fiber using the low cost components and standard single mode fiber, without complex interferometric measurement techniques, electronics or demodulation software.

关键词： Ferroelectric liquid crystal electrooptic response hydrophone sonar deformed helix ferroelectricliquid crystal fiber Bragg grating

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