A new technique for the fast implementation of Brillouin Optical Time Domain Analysis (BOTDA)
is proposed and demonstrated, carrying the classical BOTDA method to the dynamic sensing
domain. By using a digital signal generator which enables fast switching among 100 scanning
frequencies, we demonstrate a truly distributed and dynamic measurement of a 100m long fiber
with a sampling rate of ~10kHz, limited only by the fiber length and the frequency granularity.
With 10 averages the standard deviation of the measured strain was ~5 µε.
© 2012 OSA
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