title: Acoustic attenuation in gas mixtures with nitrogen: experimental data and calculations.
abstract: Attenuation in a gas results from a combination of classical attenuation, attenuation from diffusion, and attenuation due to molecular relaxation. In previous papers [J. Acoust. Soc. Am. 109, 1955 (2001); 110, 2974 (2001)] a model is described that predicts the attenuation from vibrational relaxation in gas mixtures. In order to validate this model, the attenuation was measured using a pulse technique with four transducer pairs, each with a different resonant frequency. The attenuation calculated using the model was compared to the measured values for a variety of gases including: air, oxygen, methane, hydrogen, and mixtures of oxygen/nitrogen, methane/nitrogen, carbon dioxide/nitrogen, and hydrogen/nitrogen. After the measured data is corrected for diffraction, the model matches the trends in the measured attenuation spectrum for this extensive set of gas mixtures.
authors.affiliation: Center for Sensor Materials, Michigan State University, East Lansing, Michigan 48824-1116, USA. gaffsall@msu.edu
authors.forename: Sally G
authors.initials: SG
authors.lastname: Ejakov
authors.forename: Scott
authors.initials: S
authors.lastname: Phillips
authors.forename: Yefim
authors.initials: Y
authors.lastname: Dain
authors.forename: Richard M
authors.initials: RM
authors.lastname: Lueptow
authors.forename: Jacobus H
authors.initials: JH
authors.lastname: Visser
mesh_terms: D000162:Acoustics; D004784:Environmental Monitoring; D005740:Gases / Q000032:analysis* / Q000737:chemistry; D008956:Models, Chemical; D009584:Nitrogen / Q000032:analysis* / Q000737:chemistry; D014159:Transducers; D014732:Vibration
chemical_list: D005740:Gases; D009584:Nitrogen