Measurement of Acoustic Impedance of Thin Polymeric Films by Acoustic Resonant Spectroscopy
An acoustic resonant spectroscopy technique for measuring the acoustic impedance of micron-scale polymer films without knowing any values of ultrasonic velocity, thickness and density has been developed. The method, which is based on spectral analysis, observes the acoustic resonance between water, the film and a tungsten plate with high acoustic impedance. The acoustic impedances of poly(vinyl chloride), poly(vinyl alcohol) and nylon films are determined by the spectroscopy technique. Moreover, the values of ultrasonic velocity and density of the films are also determined from the resonance frequencies of the films.
Yu Zhou, Shan-Tung Tu and Xishan Xie
H. Tohmyoh et al., "Measurement of Acoustic Impedance of Thin Polymeric Films by Acoustic Resonant Spectroscopy", Key Engineering Materials, Vols. 353-358, pp. 2349-2352, 2007