Speaker
Ziqi Chen
(Rensselaer Polytechnic Institute)
Description
The three-microphone transfer function method has been a tube measurement method widely accepted for characteristic impedance and propagation coefficient of porous materials. When combined with the multiple-microphone method, the measurement frequency range can be extended to almost twice that of traditional measurements. However, discontinuities often emerge in the wavenumber spectrum at high frequencies. This problem is due to the inherent nature of the inverse cosine function. This work unwraps the complex-valued wavenumber spectrum with sequential Bayesian inference. The results demonstrate the reliability of the proposed method for broadband characterization of porous materials.
Authors
Ziqi Chen
(Rensselaer Polytechnic Institute)
Ning Xiang
(Rensselaer Polytechnic Institute)