Dual-wavelength operation of digital spatial domain multiplexed fibre sensor arrays for dynamic strain monitoring

Abstract

A new dual wavelength digital spatial domain multiplexing technique for optical fibre sensor array is reported. It can integrate a large number of sensing fibres and as well as dual-wavelength method into a simple, robust and low cost system. It greatly enhances the capacity of tracing fast varying measurands and the absolute measuring range of strain with the digital spatial domain multiplexed sensor system. Preliminary experiments have shown the feasibility of the technique.