Abstract
Sound intensity measurements using multimicrophone probes at infrasonic frequencies are challenging mainly because the mismatch between microphone responses can be larger than the acoustic differences. Correcting microphone response mismatch via relative calibration requires an infrasound source that can provide good signal-to-noise ratios and sufficiently long averaging times. This paper describes the use of a moving vehicle as an infrasound source to obtain the necessary transfer functions between 12.7 mm diameter, type-1 microphones. The calibration approach is validated and an improved infrasound and low-audio range intensity measurement capability is demonstrated using hot-air balloon burners.
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