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Acoustical Measurements

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acoustics
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  1 © 2006 Nokia Acoustical measurements.ppt / 2006-04-19 / IJ Acoustical measurements Iiro Jantunen Nokia Research Center 19.4.2006 S-108.4010 Licentiate course in measurement science and technology  2 © 2006 Nokia Acoustical measurements.ppt / 2006-04-19 / IJ Contents ã Principles of acoustics ã  Acoustics measurements ã Microphone ã Sound pressure level measurements ã Sound intensity measurements ã Calibration ã SoundField  3 © 2006 Nokia Acoustical measurements.ppt / 2006-04-19 / IJ Principles of acoustics ã Sound waves in gas or liquid ã No shear forces → no transverse waves → purely longitudinal waves   ã  Audible sound range 20 Hz  –  20 kHz ã Fully described by 3 variables ã Pressure ã Particle velocity ã Density  4 © 2006 Nokia Acoustical measurements.ppt / 2006-04-19 / IJ Wave equations of sound ãEuler’s equation   ãNewton’s 2nd law (F=ma) applied to fluid ã Continuity equation ã Bringing extra air to a volume increases density ã State equation ã Relates pressure changes to density
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