12 October 2007 Geophysical applications of optical fiber sensors
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Proceedings Volume 6770, Fiber Optic Sensors and Applications V; 67700Q (2007); doi: 10.1117/12.735921
Event: Optics East, 2007, Boston, MA, United States
Abstract
A number of fiber optic sensors for geophysical applications have been developed over the past two decades at the Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography. These include: a strain sensor to monitor ice flow in Antarctica, a strain sensor to track sediment creep on the ocean bottom, a borehole strain sensor to monitor fault movement during earthquakes, a pressure sensor to detect low frequency acoustic waves, and a seismometer. All of these sensors utilize one of two interrogation techniques. The first is a commercially made electronic distance meter which, by measuring the transit time of light pulses through the sensing fiber, can track changes in a 1000-m-long fiber with a precision of about 1 mm. The second technique is interferometry. For this purpose, a quadrature fringe resolver based on a digital signal processor has been developed. It combines wide dynamic range (centimeters) with high resolution (picometers). Continuous records spanning days to years have been obtained with these instruments.
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M. A. Zumberge, "Geophysical applications of optical fiber sensors", Proc. SPIE 6770, Fiber Optic Sensors and Applications V, 67700Q (12 October 2007); doi: 10.1117/12.735921; http://dx.doi.org/10.1117/12.735921
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KEYWORDS
Sensors

Optical fibers

Digital signal processing

Interferometry

Signal processing

Fiber optics sensors

Ocean optics

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