November 19, 2004

The SIO/IGPP Laboratory for Atmospheric Acoustics is utilizing HPWREN for continuous array state of health monitoring and data analysis

The Laboratory for Atmospheric Acoustics of the Scripps Institution of Oceanography's Institute of Geophysics and Planetary Physics at UCSD is utilizing HPWREN for an infrasound array built to detect nuclear explosions as part of the comprehensive test ban treaty. The system is called I57US, and located at Pinyon Flats in Riverside County. It is composed of eight digitizers, which are attached to sensitive microbarometers that measure small changes in atmospheric pressure.

Site #3 of eight sites, showing the equipment vault, photovoltaic power supply system and telemetry tower.

The data is collected at an on-site central computer, and then forwarded to three different locations. The first location is the United Nations headquarters in Vienna, Austria, via a satellite uplink: the global communications interface (GCI). The second is to the Center for Monitoring Research in Virginia and the third is to the UCSD Laboratory for Atmospheric Acoustics, to monitor the status of the station and to archive data.

The connectivity to UCSD and to Virginia is utilizing HPWREN, and has been measured as typically consuming about 20 kilobits per second, with occasional peaks of 200kbps.

sensor array Site #6 showing the vault at the center of a noise reducing pipe array.

The UCSD local web site can be found at http://l2a.ucsd.edu/. The site for the larger infrasound community is at http://www.inframatics.org/.

-- Clint Coon, SIO IGPP, Development Engineer

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