Abstract
As part of the International Monitoring System of the CTBT, infrasound signals in the band 0.02 to 4 Hz must be detected in the presence of ambient noise generated chiefly by wind. The effectiveness of acoustic filters employed in standard infrasound sensors is limited by pressure propagation and attenuation characteristics within the filter. To improve the signal-to-noise ratio, an optical fiber instrument for sensing the integrated pressure variations along a line has been designed. The sensor design consists of optical fibers inside a long, fluid-filled tube, deployed along the ground surface. Integrated pressure variations along the fiber’s length are sensed by interferometrically monitoring changes in the optical path length of the fiber. The optical fiber sensor can average over kilometer-scale lengths of arbitrary geometry with an averaging bandwidth governed by the speed of light and thus should offer significant practical advantages in reducing the effect of wind noise, increasing the signal-to-noise ratio over a wide bandwidth.
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