Computer Science – Performance
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4795...88t&link_type=abstract
Materials for Infrared Detectors II. Edited by Longshore, Randolph E.; Sivananthan, Sivalingam. Proceedings of the SPIE, Volume
Computer Science
Performance
2
Scientific paper
This paper discusses the potential thermal imaging performance achievable from thermal detector arrays and concludes that the current generation of thin-film ferroelectric and resistance bolometer based detector arrays are limited by the detector materials used. It is proposed that the next generation of large uncooled focal plane arrays will need to look towards higher performance detector materials - particularly if they aim to approach the fundamental performance limits and compete with cooled photon detector arrays. Two examples of bolometer thin-film materials are described that achieve high performance from operating around phase transitions. The material Lead Scandium Tantalate (PST) has a paraelectric-to-ferroelectric phase transition around room temperature and is used with an applied field in the dielectric bolometer mode for thermal imaging. PST films grown by sputtering and liquid-source CVD have shown merit figures for thermal imaging a factor of 2 to 3 times higher than PZT-based pyroelectric thin films. The material Lanthanum Calcium Manganite (LCMO) has a paramagnetic to ferromagnetic phase transition around -20oC. This paper describes recent measurements of TCR and 1/f noise in pulsed laser-deposited LCMO films on Neodymium Gallate substrates. These results show that LCMO not only has high TCR's - up to 30%/K - but also low 1/f excess noise, with bolometer merit figures at least an order of magnitude higher than Vanadium Oxide, making it ideal for the next generation of microbolometer arrays. These high performance properties come at the expense of processing complexities and novel device designs will need to be introduced to realize the potential of these materials in the next generation of thermal detectors.
Anthony Carl J.
Blamire Mark G.
Donohue Paul P.
Todd Michael A.
Watton Rex
No associations
LandOfFree
High-performance ferroelectric and magnetoresistive materials for next-generation thermal detector arrays does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High-performance ferroelectric and magnetoresistive materials for next-generation thermal detector arrays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-performance ferroelectric and magnetoresistive materials for next-generation thermal detector arrays will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1309924