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1. (WO2018078359) DISTRIBUTED OPTICAL TEMPERATURE SENSOR

Pub. No.:    WO/2018/078359    International Application No.:    PCT/GB2017/053214
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Thu Oct 26 01:59:59 CEST 2017
IPC: G01K 11/32
Applicants: FOTECH SOLUTIONS LIMITED
Inventors: HANDEREK, Vincent
YAU, Alan
Title: DISTRIBUTED OPTICAL TEMPERATURE SENSOR
Abstract:
Methods and apparatus are disclosed for detecting a rate of change of temperature in the environment around a sensing optical fibre at a position along the fibre, in which a time varying coherent Rayleigh backscatter interference signal is detected using probe light backscattered within the sensing fibre from the position. A spectral density profile is calculated which represents frequency components in time variations of the interference signal. One or more properties of a feature of the spectral density profile are then used to determine the rate of change of temperature. The feature may be, for example, a decline in the spectral density profile with increasing frequency, or a peak in the spectral density profile.