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Distributed optical fibre temperature sensor using spread-spectrum techniques

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2 Author(s)
Everard, J.K.A. ; Dept. of Electron. & Electr. Eng., King's Coll., London, UK ; Thomas, R.

The authors describe a Raman-based distributed temperature sensor which uses spread-spectrum pseudorandom sequences to obtain high-resolution, rapid-response measurements of temperature. The sensor operates by launching a semiconductor laser beam modulated with a pseudorandom bit sequence (PRBS) into an optical fibre where the average launch power into the fibre was 5 mW. The backscattered light is detected via a fibre coupler which was built with 1 km pigtail to prevent unwanted reflections. The optical signal is then filtered using a Fabry-Perot stack to measure the Stokes and the anti-Stokes Raman lines and detected using an avalanche photodiode transimpedance amplifier combination. The output signal is then multiplied by a delayed version of the pseudorandom signal, which because of the autocorrelation function allows the spatial information to be obtained without ambiguity.

Published in:

Electronics Letters  (Volume:25 ,  Issue: 2 )