Resource Documents by Vanderkooy, John
Vanderkooy, John; and Mann, Richard
Measuring Wind Turbine Coherent Infrasound
Abstract. To extract the optimum coherent infrasound signal from a wind turbine whose rotation is not precisely periodic, we use an optical telescope fitted with a photodetector to obtain reference blade passage periods, recording these together with the microphone infrasound signal. Signal processing of the quasi-periodic microphone signal is then used to obtain periodic data, which are analyzed by an appropriate length DFT [discrete Fourier transform] to extract optimum values for the fundamental and harmonics of the coherent signal. The . . . Complete article »
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