Abstract
The growing demand for extensive and reliable structural health monitoring resulted in the development of advanced optical sensing systems (OSS) that in conjunction with wireless optical networks (WON) are capable of extending the reach of optical sensing to places where fibre provision is not feasible. To support this effort, the paper proposes a new type of a variable weight code called multiweight zero cross-correlation (MW-ZCC) code for its application in wireless optical networks based optical code division multiple access (WON-OCDMA). The code provides improved quality of service (QoS) and better support for simultaneous transmission of video surveillance, comms and sensor data by reducing the impact of multiple access interference (MAI). The MW-ZCC code’s power of two code-weight properties provide enhanced support for the needed service differentiation provisioning. The performance of this novel code has been studied by simulations. This investigation revealed that for a minimum allowable bit error rate of , and when supporting triple-play services (sensing, datacomms and video surveillance, respectively), the proposed WON-OCDMA using MW-ZCC codes could support up to 32 simultaneous services over transmission distances up to 32 km in the presence of moderate atmospheric turbulence.
Highlights
Optical sensors have found their application in structural health monitoring (SHM)thanks to their small size, high accuracy and immunity to electromagnetic noise [1]
The research presented in this study addresses the functionality gap between emerging optical sensor networks and urban SHM in order to leverage efficient remote vibration sensing of constructed sites
This paper proposes a new family of multiweight zero cross-correlation (MW-ZCC) codes for use in advanced monitoring systems for carrying information collected by optical sensors monitoring structural vibration
Summary
Optical sensors have found their application in structural health monitoring (SHM)thanks to their small size, high accuracy and immunity to electromagnetic noise [1]. Optical sensors have found their application in structural health monitoring (SHM). Optical fibres that carry sensor signals have been used as sensing elements themselves. The successful application of optical sensing in the construction industry has been reported for different monitoring purposes including gas leakage [3], temperature [4], strain [5], structure vibration [6], reinforced concrete beams [7]. Several fibre-optic methods and tools have been developed for vibration monitoring. The feasibility of a fully distributed vibration sensing was evaluated based on a fibre diversity detection sensor [12]. An intensity-modulated fibre-optic accelerometer was developed for vibration monitoring of wind turbine blades [13]
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