ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

2aSP7. A large microphone array for outdoor sound propagation studies.

David I. Havelock

Inst. for Microstructural Sci., National Research Council, Ottawa, ON K1A 0R6, Canada

A sound field propagating outdoors is perturbed by the turbulence in the atmosphere. To study the fluctuations due to turbulence, the sound field is measured simultaneously at a large number of points using a microphone array. The array consists of 64 microphones which can be configured in a variety of geometries ranging from small patches of only a few square meters to an elongated array spanning 700 m. Remote ``satellite'' arrays are also possible. The data are collected and processed in a mobile equipment trailer. The microphones, electronics, data collection, and processing are described and practical aspects of deploying the array are discussed. The design criteria and example applications of the array are also discussed.