Abstract
We report on a method to measure the longitudinal position of an
acoustic burst, or spark, using an all-fiber Sagnac Interferometer (SI). A
focused pulsed ~10 ns laser is used to ionize air creating the spark. This
ionization point is situated near a coil of test fiber connected to the SI
but acoustically separated from the bulk of the SI. A fast Fourier
transform (FFT) performed on the temporal signal of the SI shows a series
of nulls from which the position of the acoustic signal is determined.
Over an SI length of ~35 km, longitudinal positions are determined to
within tens of meters,corresponding to a best run percent uncertainty of
0.07%.
© 2004 IEEE
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