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A new method is proposed for the determination of acoustic impedance of a material present in the form of a membrane. It has been successfully tried on two different types of polymer membranes, viz. PMMA membrane of thickness 0.20 mm and PET membrane of thickness 0.02 mm. Significantly, the method does not require the knowledge of either ultrasonic velocity or thickness or density of the membrane...
A method is presented for the ultrasonic attenuation measurement as a function of frequency using a broad band transducer. The diffraction correction has been introduced in the expression such that an algorithm may be developed for evaluation of attenuation directly. This eliminates the introduction of the diffraction correction curve separately. Results are presented for various types of aluminium...
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