66--infrasound acoustic monitors

The U.S. Geological Survey (USGS) intends to award a purchase order to Chaparral Physics Geophysical Institute of the University of Alaska in Fairbanks, AK, for infrasound acoustic monitors. The sensors must meet specific technical specifications, including nominal sensitivity, full-scale range, and signal characteristics. The acquisition is directed at existing products only, and the sensors must be delivered by September 30, 2026. • The sensors must have a nominal sensitivity of .0275V/Pa@1Hz or greater • The sensors must have a full-scale range of 720Pa peak to peak full scale input range or greater • The sensors must have a flat frequency response from .02Hz to 240Hz or wider band • The sensors must have a band-limited self-noise of 5mPa RMS from 0.05 to 200Hz or less • The sensors must have a dynamic range of 110dB or greater