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Proceedings Paper

Ferroelectric arrays: the route to low-cost uncooled infrared imaging
Author(s): Stephen G. Porter; Rex Watton; Kennedy Robert McEwen
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Paper Abstract

Large arrays of ferroelectric elements have considerable potential for thermal imaging applications, offering operation and performance which challenges the cooled semiconductor detectors. A hybrid array technology, exploiting ferroelectric ceramic materials is the basis of a successful range of two dimensional arrays. The success is based on hot pressed ceramic (operated in both pyroelectric and dielectric bolometer modes), and the technologies for solder bump bonding and element reticulation. Arrays have been made with up to 105 elements at pitches down to 40 micrometer, thus providing high resolution in compact systems. Ferroelectrics have now been produced as thin films with high figures of merit and, once deposition techniques compatible with silicon integrated circuits have been demonstrated, these will allow a more direct array fabrication. These integrated array technologies have potential for high yield and low cost arrays of very large numbers of elements. Thermal imaging systems research has led to a signal conditioning architecture optimized for pyroelectric and dielectric bolometer arrays and exploiting the ac coupling of the ferroelectric response to the radiation. The resulting compact sensors give high image quality with low fixed pattern nose in reliable, low power formats.

Paper Details

Date Published: 8 September 1995
PDF: 10 pages
Proc. SPIE 2552, Infrared Technology XXI, (8 September 1995); doi: 10.1117/12.218255
Show Author Affiliations
Stephen G. Porter, GEC-Marconi Materials Technology Ltd. (United Kingdom)
Rex Watton, Defence Research Agency Malvern (United Kingdom)
Kennedy Robert McEwen, GEC-Marconi Avionics Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 2552:
Infrared Technology XXI
Bjorn F. Andresen; Marija Strojnik, Editor(s)

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