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LINEAR MICROPHONE ARRAY
The linear microphone array mounted in the NASA Glenn 9’x 15’ Low Speed Wind Tunnel
Improving acoustic measurements
Making high-quality acoustic measurements in a Mach 0.2 flow is a challenging proposition. Think of how noisy a high-speed air flow can sound when you stick your head out a car window. Now imagine an air flow of 150 MPH! The NASA Glenn 9’ x 15’ Low Speed Wind Tunnel runs at these speeds to simulate an aircraft taking off or landing. Taking sound measurements at these speeds is challenging, and required special instrumentation. One instrument being used in the wind tunnel is the linear microphone array pictured above. This is a long, smooth panel with microphones embedded in groups of three at sixteen locations along its length. When used with statistical data processing methods, this can help eliminate the wind noise and improve measurements of the model being tested.