title: Effectiveness of nonporous windscreens for infrasonic measurements.
abstract: This paper deals with nonporous windscreens used for reducing noise in infrasonic measurements. A model of sound transmission using a modal approach is derived. The system is a square plate coupled with a cavity. The model agrees with finite element simulations and measurements performed on two windscreens: a cubic windscreen using a material recommended by Shams, Zuckerwar, and Sealey [J. Acoust. Soc. Am. 118, 1335-1340 (2005)] and an optimized flat windscreen made out of aluminum. Only the latter was found to couple acoustical waves below 10 Hz without any attenuation. Moreover, wind noise reduction measurements show that nonporous windscreens perform similarly as a pipe array by averaging the pressure fluctuations. These results question the assumptions of Shams et al. and Zuckerwar [J. Acoust. Soc. Am. 127, 3327-3334 (2010)] about compact nonporous windscreens design and effectiveness.
authors.affiliation: Galileo Galilei, Sorbonne universités, Université de technologie de Compiègne, CNRS, laboratoire Roberval, CS 60 319, 60203 Compiègne cedex, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Dauchez
authors.affiliation: SUPMECA, 3 rue Fernand Hainaut, 93407 Saint Ouen cedex, France.
authors.forename: Maxime
authors.initials: M
authors.lastname: Hayot
authors.affiliation: CEA, DAM, DIF F91297 Arpajon Cedex, France.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Denis