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The ARL/FEU (Fluids Engineering Unit) Semi-Anechoic Chamber.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
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This memorandum documents the design and acoustic characteristics of the ARLFluids Engineering Unit semi-anechoic chamber. It is located on the first floor of the Garfield Thomas Water Tunnel and has internal dimensions of 11 x 12 x 8 feet. The sound absorbing walls are primarily composed of rock-wool fiberglass insulation, air voids, and wood frame members. Based on measurements of the ambient noise level, reverberation time, transmission loss, and inverse square law, the chamber is considered semi-anechoic for frequencies less than approximately 1kHz and moderately anechoic for greater frequencies.
APPROVED FOR PUBLIC RELEASE