Publications
Evaluation of Experimental Shroud Designs for the Hyperion 5201W Infrasound Sensor
Sandia National Laboratories has tested and evaluated various infrasound shrouds , produced Do ug Seastrand and Gary Walker, DOE staff in Las Vegas, Nevad a, intended for a Hyperion 5201W digital infrasound sensor . The purpose of these shrouds is to improve the infrasound sensor's attenuation of incoherent signals, specifically those caused by wind pas sing by the sensor. The purpose of the shroud evaluation was to measure amplitude and phase of the sensors with a variety of shroud designs attached and determine whether there is any appreciable changes in amplitude and/or phase response over the IMS p assband for infrasound applications, 0.02 Hz to 4.0 Hz. These shrouds utilize a tubule design that directs and mixes airflow from ports radially distributed at approximately 90 degree offsets in an attempt to minimiz e wind - generated signal due to B ernou lli effect caused by airflow passing by ports perpendicular to the wind. ACKNOWLEDGEMENTS This work was funded by the United States Department of Energy Office of Nuclear Verification (NA - 221). We would like to thank Hyperion Inc, for providing sens or nominal response information and the noise model. We also wish to thank the DOE office in Las Vegas, Nevada for loaning us the digitizer - sensor units and shrouds evaluate d herein .