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Proceedings Paper

Computation of current responsivity of a bimorph pyroelectric infrared detector
Author(s): Padmaja Guggilla; A. K. Batra; J. R. Currie; M. D. Aggarwal; R. B. Lal
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Paper Abstract

Pyroelectric detectors for infrared radiation are thermal sensors operating at ambient temperature, unlike semiconductor detectors, which require cooling. They have a uniform spectral response in a wide range of wavelengths, including main band of infrared transmission of the earth's atmosphere. The effective sensitivity and performance depend not only on the sensor material characteristics but also on the thermal performance of the complete structure of a detector. Recently, it has been proposed that bimorph (two pyroelectric materials stacked together) detector structure shall show better pyroelectric performance than the monomorph. Thus, a one-dimension thermal diffusion equation has been solved for nlayered structure for pyroelectric bimorph films. In such a system, performance of any number of layers of a detector structure can be derived, predicted, and optimized using these computations. Using viable bimorph element sensor configurations and materials parameter, the calculated and predicted current responsivity and other parameters are presented. It is predicted that greater enhancement of the bimorph current responsivity relative to that of monomorph using well-known pyroelectric materials, require higher modulating frequency or thicker bottom (lower) pyroelectric layer of the bimorph detector structure.

Paper Details

Date Published: 7 September 2006
PDF: 10 pages
Proc. SPIE 6295, Infrared Detectors and Focal Plane Arrays VIII, 62950Q (7 September 2006); doi: 10.1117/12.679501
Show Author Affiliations
Padmaja Guggilla, Alabama A&M Univ. (United States)
A. K. Batra, Alabama A&M Univ. (United States)
J. R. Currie, NASA Marshall Space Flight Ctr. (United States)
M. D. Aggarwal, Alabama A&M Univ. (United States)
R. B. Lal, Alabama A&M Univ. (United States)

Published in SPIE Proceedings Vol. 6295:
Infrared Detectors and Focal Plane Arrays VIII
Eustace L. Dereniak; Robert E. Sampson, Editor(s)

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