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Distributed Temperature Sensing Using Cyclic Pseudorandom Sequences
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DOI：10.1109/JSEN.2016.2647206.png)
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Abstract
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An alternative for commercial Raman-Optical Time Domain Reflectometry (OTDR) distributed temperature sensors is presented, where a pseudorandom pulse sequence is used to increase the signal to noise ratio. Additionally, a deconvolution algorithm is proposed to eliminate distortions in the reconstruction arising from the real correlation properties of the sensing signal. An improvement in SNR of a factor 11 respect to the Raman-OTDR method at the same peak power was achieved, allowing 2 m and 1.5 degrees C resolution in a 6 s measurement using a 90-mW Continuous wave semiconductor laser.
Keywords:
Optical fiber sensors
temperature sensors
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