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Proceedings Paper

Operational characteristics of LWIR AOTF based multispectral imager
Author(s): N. B. Singh; M. Gottlieb; D. Suhre; D. Kahler; D. J. Knuteson; A. Berghmans; B. Wagner; J. Hedrick; T. Karr; J. J. Hawkins
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Paper Abstract

Northrop Grumman has designed, developed and demonstrated acousto-optic tunable filter (AOTF) based hyperspectral imager to cover visible to long wavelength infrared (LWIR) spectral region. We have experimentally demonstrated and report the results of crystal growth, fabrication, design, development and performance for the long wavelength infrared (LWIR) acousto-optic tunable filter (AOTF)-based hyperspectral imager based on an efficient crystal thallium arsenic selenide. The results on the growth of 40 mm diameter and 15 cm long crystals, 4.0 cm long AOTF fabrication, and system design and performance are presented. A system concept was developed with high efficiency, resolution, and throughput utilizing this TAS AOTF. The test setup consisted of an LWIR camera (microbolometer), the AOTF, and SF6. The object was placed ~20" in front of the AOTF. The camera was aligned to the first order diffracted beam of the AOTF. The AOTF was tuned to 10.6 um wavelength by applying a 13.9 MHz RF signal on the transducer. The results on the growth of crystals, AOTF fabrication, and systems design and performance are presented.

Paper Details

Date Published: 26 April 2007
PDF: 7 pages
Proc. SPIE 6554, Chemical and Biological Sensing VIII, 65540E (26 April 2007); doi: 10.1117/12.721516
Show Author Affiliations
N. B. Singh, Northrop Grumman Corp. (United States)
M. Gottlieb, Northrop Grumman Corp. (United States)
D. Suhre, Northrop Grumman Corp. (United States)
D. Kahler, Northrop Grumman Corp. (United States)
D. J. Knuteson, Northrop Grumman Corp. (United States)
A. Berghmans, Northrop Grumman Corp. (United States)
B. Wagner, Northrop Grumman Corp. (United States)
J. Hedrick, Northrop Grumman Corp. (United States)
T. Karr, Northrop Grumman Corp. (United States)
J. J. Hawkins, Northrop Grumman Corp. (United States)

Published in SPIE Proceedings Vol. 6554:
Chemical and Biological Sensing VIII
Augustus W. Fountain III, Editor(s)

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