A low temperature acoustic microscope has been developed to study mechanical and acoustic property of materials at temperatures from 30°C to - 94°C. In the application to a 30/Lm thick PVDF film, sharpening of the half wavelength resonance of longitudinal wave across the film was observed by cooling. For 0.6 mm thick epoxy adhesive layer, struc- tures not visible at ambient temperature became clear when the sample was cooled to - 30°C. This improvement was explained in terms of the decrease in the attenuation loss and impedance mismatching loss. Basedon those results, temperature controlled acoustic imaging is proposed for nondestructive evaluation of polymers.
ASJC Scopus subject areas
- Physics and Astronomy(all)