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Proceedings Paper

Enhanced sensitivity for hyperspectral infrared chemical detection
Author(s): Phillip L. Jacobson; Roger R. Petrin; Aaron C. Koskelo; Charles Robert Quick Jr.; Jerry Romero
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Paper Abstract

The sensitivity of imaging, hyperspectral, passive remote sensors in the long-wavelength infrared (LWIR) spectral region is currently limited by the ability to achieve an accurate, time-invariant, pixel-to-pixel calibration of the elements composing the Focal Plane Array (FPA). Pursuing conventional techniques to improve the accuracy of the calibration will always be limited by the trade-off between the time required to collect calibration data of improved precision and the drift in the pixel response that occurs on a timescale comparable to the calibration time. This paper will present the results from a study of a method to circumvent these problems. Improvements in detection capability can be realized by applying a quick, repetitive dither of the field of view (FOV) of the imager (by a small angular amount), so that radiance/spectral differences between individual target areas can be measured by a single FPA pixel. By performing this difference measurement repetitively both residual differences in the pixel-to-pixel calibration and 1/f detector drift noise can effectively be eliminated. In addition, variations in the atmosphere and target scene caused by the motion of the sensor platform will cause signal drifts that this technique would not be able to remove. This method allows improvements in sensitivity that could potentially scale as the square root of the observation time.

Paper Details

Date Published: 22 August 2001
PDF: 11 pages
Proc. SPIE 4378, Chemical and Biological Sensing II, (22 August 2001); doi: 10.1117/12.438187
Show Author Affiliations
Phillip L. Jacobson, Los Alamos National Lab. (United States)
Roger R. Petrin, Los Alamos National Lab. (United States)
Aaron C. Koskelo, Los Alamos National Lab. (United States)
Charles Robert Quick Jr., Los Alamos National Lab. (United States)
Jerry Romero, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 4378:
Chemical and Biological Sensing II
Patrick J. Gardner, Editor(s)

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