Measuring acoustic transmission loss using the 3-point method

S. Bilawchuk, K.R. Fyfe


Traditional measurement of transmission loss (TL) involved measuring sound pressure levels with and without the silencing element in place. As such, a 3-point method for measuring TL that can be performed entirely while the silencing element is in place is proposed. This 3-point method is shown to match the results of the traditional method very well. With this method, silencers can be tested for TL in field conditions for easier post-installation evaluation.


Acoustic intensity measurement; Acoustic wave absorption; Anechoic chambers; Data acquisition; Microphones; Reverberation; Wave equations; Acoustic transmission loss measurement; Microphone measurements; Sound absorbing materials; Sound pressure levels; Standing wave impedance tube; Three point method

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