THE USE OF PVDF IN ACOUSTIC DEVICES
G JONES · 2024
INTRODUCIIONPiezo-electric materials have been in use as transducers for musical instruments for many years and, are recently.in ultrasonic applications.Naturally occurring piezo-crystals such as Quartz, Tourmaline and Rochelle salt have led to the development of ceramics with improved piezo-electric properties such as Barium Titanate.These have a randomly aligned crystallite structure which does not exhibit a piezo-electric effect.when the polar axes of these crystals are aligned by the application of an electric field (paling), the resulting ceramic becomes piezo-electric.Being rigid and brittle ceramics have some limitation in application and considerable research has been undertaken todEVEIOP other materials, in particular polymers, which can be induced to exhibit piezo-electric properties.Many polar and non-polar polymers come into this category but Kauai [1] showed, in 1969, that PVdF could be activated to a greater extent than any other naterial then available.