Patent ID: 8152370
Filing Date: 2012-04-10
Classification: G01K

Abstract:
1. An optical fibre temperature sensor comprising: an optical pulse generator generating optical pulses; an optical fibre into which said optical pulses are fed; an optical receiver to receive said optical pulses reflected by said optical fibre and to convert them into an electrical signal; a processor which receives said electrical signal and determines the temperature along said optical fibre; said optical receiver comprising a first filter and a second filter to filter said optical pulse reflected by said optical fibre wherein said first and said second filters are passband filters centered on two adjacent spectral windows of Raman anti-Stokes optical signals or of Raman Stokes optical signals and said two adjacent spectral windows of anti-Stokes optical signals are converted into a first electrical signal and a second electrical signal characterised in that said processor determines the ratio between said first electrical signal and said second electrical signal.