An Optical Fiber Infrasound Sensor

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Presentation transcript:

An Optical Fiber Infrasound Sensor Institute of Geophysics and Planetary Physics Scripps Institution of Oceanography University of California, San Diego An Optical Fiber Infrasound Sensor M. Zumberge, J. Blum, K. Walker, J. Berger, M. Dzieciuch, M. Hedlin Presented to Infrasound Technology Workshop 29 Oct 2003

Old Infrasound Technology Basic design is a single-point microbarograph connected to a series of pipes for spatial filtering

New Sensor Concept A long, compliant, sealed tube deforms as pressure changes An optical fiber wrapped around the tube senses the deformation

line-integrated average

Instrument Construction and Installation

Effect of geometry on response linear sensors depend on length, signal , and arrival azimuth circular sensors depend on diameter and signal 

Conclusions The OFIS is comparable to the best pipe array from the microbarom band up to 1 Hz Above 1 Hz, the OFIS is significantly quieter The OFIS is also a very good microphone The sensor can be made significantly longer to average over a larger region An array of OFISs will be capable of determining source azimuth Rapidly deployable, above-ground OFISs are viable sensors for infrasound source monitoring Some TEDs (Technical Engineering Details) remain to be solved before we can deploy OFISs routinely or widely

Acknowledgements Funding for research and development of the OFIS has been provided by: Scripps Institution of Oceanography Kinemetrics Corporation The Green Foundation for Earth Science The Defense Threat Reduction Agency DARPA SAIC