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Relating FFT magnitude to dBSPL
Dear Catherine,

you are perhaps aware that the acceleration spectrum does not help you that much with infrasound matters. I am also a bit unsure if smart device mics (the electronics part) are sensitive to infrasound at all, they would miss most of the range at least…

If the infrasound levels are high enough to cause vibrations, these could be seen in the acceleration spectrum. “dbSPL” is an acoustics measure (*S*ound *P*ressure *L*evel) that makes no sense for kinematics. Acceleration is given in m/s² (velocity change per time interval).

The Fourier transform of the recorded acceleration gives you an impression of the relative intensities of frequencies, that's why it is given in arbitrary units (a.u.). If you put your smartphone on a washing machine rotating at 1200 rpm, you would see a sharp peak at 20 Hz, for instance.

Messages In This Thread
RE: Relating FFT magnitude to dBSPL - by Jens Noriʇzsɔɥ - 11-23-2020, 03:40 PM

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