Geophysical applications of optical fiber sensors

M. A. Zumberge

doi:10.1117/12.735921

12 October 2007 Geophysical applications of optical fiber sensors

M. A. Zumberge

Proceedings Volume 6770, Fiber Optic Sensors and Applications V; 67700Q (2007) https://doi.org/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.

Citation Download Citation

M. A. Zumberge "Geophysical applications of optical fiber sensors", Proc. SPIE 6770, Fiber Optic Sensors and Applications V, 67700Q (12 October 2007); https://doi.org/10.1117/12.735921

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