A new measuring system for ultrasonic spectioscopy was constructed, utilizing PVDF [poly(vinylidene fluoride)] polymer films as wideband transducers In a test of its performance, this measuring system was successfully applied to study of the nematic-i...
A new measuring system for ultrasonic spectioscopy was constructed, utilizing PVDF [poly(vinylidene fluoride)] polymer films as wideband transducers In a test of its performance, this measuring system was successfully applied to study of the nematic-isotropic phase transition in MBBA(p-methoxybenzyli-dene-p-n-butylan iline) liquid crystal. We could be could that the phase transition in MBBA is 47℃, which is agree with the exciting optical method, The dependence of frequency on the phase transition was not observed, and but Maximum ultrasonic amplitude is measured for the resonance frequency 2㎒ in PVDF transducers, These results shows that the spectroscopy with PVDF transducers takes advantage of studying the transient phenomena When our apparatus is applied in medical purposes, It will be possible diagnostic for sickle-cell anemia and arterial sclerosis