Enhanced sensitivity for hyperspectral infrared chemical detection

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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 ... continued below

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12 p.

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Jacobson, P. L. (Phillip L.); Petrin, R. R. (Roger R.); Koskelo, A. C. (Aaron C.); Quick, C. R. (Charles R.) & Romero, J. J. (Jerry J.) January 1, 2001.

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Description

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 l/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 be able to remove. This method allows improvements in sensitivity that could potentially scale as the square root of the observation time.

Physical Description

12 p.

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  • "Submitted to: SPIE 15th Annual International Symposium on Aerospace/Defense Sensing, Simulation, and COntrols, 16-20 April 2001, Orlando, FL"

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  • Report No.: LA-UR-01-1949
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975289
  • Archival Resource Key: ark:/67531/metadc929474

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 2001

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 5:53 p.m.

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Jacobson, P. L. (Phillip L.); Petrin, R. R. (Roger R.); Koskelo, A. C. (Aaron C.); Quick, C. R. (Charles R.) & Romero, J. J. (Jerry J.). Enhanced sensitivity for hyperspectral infrared chemical detection, article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc929474/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.