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Proceedings Paper

Ten-dollar thermal infrared imager
Author(s): Philip C. D. Hobbs
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Paper Abstract

A thermal infrared imager of competitive sensitivity and very simple construction is presented. It is a pyroelectric device of 96 pixels, based on ferroelectric polyvinylidene fluoride (PVDF). It uses a novel charge-dispensing multiplexer based on ordinary light emitting diodes to achieve a noise-equivalent temperature change (NETD) of 0.13 K at a 5 Hz frame rate (2.1 Hz BW). Design information, theory, and measured performance are presented. Achieving such a low total system cost requires the use of the very least expensive optical system, a moulded polyethylene Fresnel lens, whose advantages and limitations are discussed. Several possible improvements, aggregating approximately 30 dB in sensitivity are also discussed, leading to the interesting possibility of few-millikelvin NETD values with an uncooled pyroelectric device of extremely low cost.

Paper Details

Date Published: 27 December 2001
PDF: 10 pages
Proc. SPIE 4563, Sensors and Controls for Intelligent Manufacturing II, (27 December 2001); doi: 10.1117/12.452658
Show Author Affiliations
Philip C. D. Hobbs, IBM Thomas J. Watson Research Ctr. (United States)

Published in SPIE Proceedings Vol. 4563:
Sensors and Controls for Intelligent Manufacturing II
Peter E. Orban, Editor(s)

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