Absorption of Low Frequency Sound in a Homogeneous Atmosphere,
Abstract
This is an elementary review of the classical and molecular theory of the absorption of sound, with particular attention to the absorption of frequencies less than 1000 cps in the atmosphere from sea level to 50 km. The variation of the theoretically predicted absorption with the meteorological parameters--pressure, temperature, and humidity--is investigated. Recent work involving absorption due to radiation is included. The absorption has been calculated for various altitudes, humidities, and frequencies. These data are presented in tabular form in the appendix. Although the absorption varies in a rather complicated manner with the meteorological parameters, it is found to be quite small for the very low frequencies, resulting in a predicted long distance propagation with small attenuation if the geometry of propagation is advantageous. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1959
- Accession Number
- AD0730700
Entities
People
- E. Alan Dean