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Proceedings Article

Ferroelectrics in uncooled thermal imaging

[+] Author Affiliations
Rex Watton, Paul A. Manning

Defence Evaluation Research Agency Malvern (United Kingdom)

Proc. SPIE 3436, Infrared Technology and Applications XXIV, 541 (October 26, 1998); doi:10.1117/12.328053
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From Conference Volume 3436

  • Infrared Technology and Applications XXIV
  • Bjorn F. Andresen; Marija Strojnik
  • San Diego, CA, USA | July 19, 1998

abstract

Uncooled Thermal Imaging (TI) in the UK involves large arrays of ferroelectric bolometer elements, at a pitch of from 100 micrometer down to 40 micrometer. A Hybrid Array Technology, exploiting the pyroelectric property of ferroelectric ceramic materials for the bolometer elements, has produced a range of successful solder bump bonded 2-D arrays. However, in innovative technologies under research, direct deposition of the ferroelectric material as a thin film onto suitable thermal microstructures on the silicon readout IC will provide substantial reductions in costs as well as improved performance. A route has been defined for this Integrated Array Technology, leading to performance enhancements by a factor of three over the Hybrids. In achieving the performance, the optimized ferroelectric signal readout, signal conditioning and processing architectures perfected for the Hybrid Arrays will be retained. Microscan mechanisms, readily incorporated in the IR chopped format used with ferroelectric imaging, have been demonstrated for the Hybrids, and will be even more closely matched to the improved thermal diffusion MTF of the Integrated devices. The ferroelectric capacitative detector filters the high frequencies, limiting noise bandwidths for very large arrays, and with microscan technology added, the ferroelectric arrays retain their potential to provide high quality IR imaging at very large equivalent array sizes.

© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Rex Watton and Paul A. Manning
"Ferroelectrics in uncooled thermal imaging", Proc. SPIE 3436, Infrared Technology and Applications XXIV, 541 (October 26, 1998); doi:10.1117/12.328053; http://dx.doi.org/10.1117/12.328053


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