Within the group of pyroelectric materials, PVDF (polyvinylidene fluoride) not only has the advantages of a polymer (cheap, easy to process), it also yields a signal voltage of the same order of magnitude as conventional single-crystal lithium tantalate. Because of their low thermal conductivity, self-supporting PVDF films show a high spatial resolution which is important for sensor arrays. A four-element array and its directive diagram and measurements of signals produced by a moving human body are used to illustrate the directional selectivity of the various sensor elements. By evaluating directional motion, such arrays allow traffic monitoring and area supervision.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering