DISTRIBUTED FIBRE SENSING DEVICE BASED ON DUAL CHANNEL AND RUNNING METHOD THEREOF

摘要

A distributed fibre sensing device based on dual channel. The employed fibre (11) is a fibre having two optical signal transmission channels (15, 16), such as a dual-core fibre, a dual-cladding or multi-cladding fibre. The optical signal has different speeds in the two optical signal transmission channels (15, 16). The purpose of monitoring a physical quantity to be detected in a distributed way can be realized by detecting the change in the optical signal between the two optical signal transmission channels (15, 16) and the relative position of each optical signal. The fibre sensing device has the advantages of being convenient in use, low in costs, and high in accuracy. Also provided are four running methods for a distributed fibre sensing device based on dual channel.