Comparison of three measurement techniques for the normal absorption coefficient of sound absorbing materials in the free field.

@article{Hirosawa2009ComparisonOT,
  title={Comparison of three measurement techniques for the normal absorption coefficient of sound absorbing materials in the free field.},
  author={Kunikazu Hirosawa and Kazuhiro Takashima and Hiroshi Nakagawa and Makoto Kon and Aki Yamamoto and W. Lauriks},
  journal={The Journal of the Acoustical Society of America},
  year={2009},
  volume={126 6},
  pages={3020-7}
}
Three different techniques for evaluating the absorption coefficient of sound absorbing materials in free field conditions are discussed. One technique measures the acoustic impedance at one point nearby a specimen, the other two techniques evaluate the impedance from the transfer function of two sound pressures and two particle velocities at two points… CONTINUE READING