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| Author: | Mark Zumberge |
| Institution: | IGPP, University of California, San Diego, La Jolla, CA 92093-0225 |
| Email: | zumberge@ucsd.edu |
| Authors: | Mark Zumberge, Jon Berger, John Blum, Matt Dzieciuch, Kris Walker, and Michael Hedlin |
Abstract Title:
"Progress on optical fiber infrasound sensors" |
Abstract:
Most present-day infrasound sensors make use of a microbarometer connected to an array of pipes designed to filter out noise from wind. We have developed a sensor which consists of a compliant tube wrapped helically with optical fibers whose lengths are recorded interferometrically. This sensor records pressure fluctuations integrated along the path defined by the orientation of the sensor on the ground (the longest being 89 m thus far).
Initial experiments were aimed at frequencies below 10 Hz. Recent tests compared the sensor's performance with microphones at frequencies up to 100 Hz.
A number of instrumental issues are currently under study, including variation in the instrument calibration with time and its dependence on temperature, stability of the interferometer, and methods to mitigate environmental problems. Three OFISs are currently in operation at Pinon Flat Observatory. |
| Keywords: | optical fiber, high frequency, integration |
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