20 May 2013 Results from a borehole optical fiber interferometer for recording Earth strain
Author Affiliations +
Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87940Q (2013) https://doi.org/10.1117/12.2025896
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland
Abstract
We have installed a set of 250 m long borehole optical fiber strainmeters at Piñon Flat Observatory in southern California, USA. These instruments consist of an optical fiber stretched between two positions in the borehole – the upper position is at depth of 4 m and the lower is at a depth of 254 m. The tensioned optical fiber’s length is monitored interferometrically; vertical Earth strain is determined by recording the fiber length change over this interval. We achieve a strain sensitivity of about 0.01 n(epsilon) (10–11) at periods near 1 s. The noise in the tidal band is 300 n(epsilon)/√Hz (near 1cycle per day). After an initial settling period of about a year, the instrument drift is 1-2 μ(epsilon) per year.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark A. Zumberge, Mark A. Zumberge, Scott DeWolf, Scott DeWolf, Frank K. Wyatt, Frank K. Wyatt, Duncan C. Agnew, Duncan C. Agnew, Don Elliott, Don Elliott, William Hatfield, William Hatfield, } "Results from a borehole optical fiber interferometer for recording Earth strain", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87940Q (20 May 2013); doi: 10.1117/12.2025896; https://doi.org/10.1117/12.2025896
PROCEEDINGS
6 PAGES


SHARE
RELATED CONTENT

Fiber optic interferometer as a security element
Proceedings of SPIE (April 29 2016)
Status of PRIMA for the VLTI: heading to astrometry
Proceedings of SPIE (September 12 2012)
Portable intensity interferometry
Proceedings of SPIE (September 12 2012)
Preparing MIDI science operation at VLTI
Proceedings of SPIE (October 20 2004)

Back to Top