ASA 125th Meeting Ottawa 1993 May

5aPA1. On the placement of microphones for outdoor measurements.

Scott Morgan

Dept. of Phys., Southeastern Louisiana Univ., P.O. Box 878 SLU, Hammond, LA 70402

Henry E. Bass

Richard Raspet

Marjorie Klugerman

Stephen Wood

Univ. of Mississippi, University, MS 38677

Acoustic measurements outdoors typically involve microphones located either on the surface or on stands which hold the microphone approximately 1.0 m above the ground. Arguments given for placing microphones on the surface include lower wind noise and ease of installation. Quite often microphones on the surface are mounted above a large solid sheet. In this talk, the effects of wind noise and ground impedance on the optimum design of measurement systems for different frequency and source position are considered.