Industrial applications of piezoelectric polymer transducers

Abstract

The discovery of highly active piezoelectric polymer materials was first reported in 1969. Since then an enormous amount of research work has been conducted, mainly aimed at discovering the structure and properties of these fascinating materials with the further aim of improving their piezoelectric and pyroelectric behaviour. An equally vast amount of literature devoted to applications of these polymers has appeared and even a cursory glance at all this shows that they have been applied as the basis for a wide range of devices. The subject has now reached a degree of maturity and in the nondestructive testing field, there is perhaps a 'niche market' emerging for transducers based on polyvinylidene fluoride and its derivatives. In certain areas such as miniature

Polymeric Piezoelectric Transducers for Hydrophone Applications

“…The first commercially available PVDF transducers were audio headphones and loudspeakers, which used thin film PVDF in the 31 mode. Chen and Payne 19 demonstrated the enormous range of applications for piezoelectric polymer materials, particularly for miniature underwater hydrophones 19 .…”

Contribution au développement d'un capteur ultrasonique pour mesurer l'épaisseur de la glace /

“…Il consiste à appliquer à l'échantillon un signal sinusoïdal haute tension à très basse fréquence, 1 Hz typiquement, et dont l'amplitude est supérieure au champ coercitif [Bauer, 1982]. Il est à noter que les propriétés piézo-électriques dépendent fortement de la polarisation rémanente du matériau [Davis, 1988], [Furukawa et Wang] et [Chen et Payne, 1994]. …”

“…L'intensité sur l'axe de propagation dans ce cas passe par une succession de maxima et de minima dont les abscisses sont données par [Banks et al, 1966], [Ristic, 1983] et [Chen et Payne, 1994]:…”

Main Chain Noncentrosymmetric Hydrogen Bonded Macromolecules Incorporating Aniline, Alkanol, and Alkanoic Acid Hydrogen Bond Donors

“…Poled organic thin films are technologically useful materials [1][2][3][4][5][6][7][8][9] which have several advantages over traditional inorganic crystals including ease of processing [10], larger second order susceptibilities [11], an intrinsically low dielectric constant [10], and significantly faster responses [12][13][14][15]. Our approach to poled organic films involves surfaceinduced polar alignment of main chain noncentrosymmetric hydrogen bonded liquid crystalline macromolecules [16].…”