
Low frequency in situ metrology of absorption and dispersion of sound absorbing porous materials based on high power ultrasonic non-linearly demodulated waves
Keywords: ضریب جذب; Acoustic in situ measurements; Portable instrumentation; Ultrasonic demodulation in air; Non-linear high power ultrasonics; Absorption coefficient; Dispersion; “Equivalent fluid” model; Porous materials; Automotive felts; Compressed sound absorbing materi