Abstract
The acoustic intensity In along a unit vector n̂ can easily be determined by using a cardioid microphone and a voltmeter. If an rms voltage e+ is generated with the microphone oriented against n̂, and e− with the microphone directed with n̂, then In = (e+2 − e−2)/(k12ρc), where k1 is the voltage sensitivity of the microphone and ρc is the specific acoustic resistance. In a plane wave reflected from a boundary (as in an impedance tube), the quantity e+2/(k12ρc) represents the intensity of the forward traveling wave and the quantity e−2/(k12ρc) that of the reflected wave. Thus the power reflection coefficient αr = (e−/e+)2.
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