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Proceedings Paper

Dual-band infrared capabilities for imaging buried-object sites
Author(s): Nancy DelGrande; Philip F. Durbin; Michael R. Gorvad; Dwight E. Perkins; Gregory A. Clark; Jose D. Hernandez; Robert J. Sherwood
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Paper Abstract

We discuss dual-band infrared (DBIR) capabilities for imaging buried object sites. We identify physical features affecting thermal contrast needed to distinguish buried object sites from undisturbed sites or surface clutter. Apart from atmospheric transmission and system performance, these features include: object size, shape, and burial depth; ambient soil, disturbed soil and object site thermal diffusivity differences; surface temperature, emissivity, plant-cover, slope, albedo and roughness variations; weather conditions and measurement times. We use ground instrumentation to measure the time-varying temperature differences between buried object sites and undisturbed soil sites. We compared near surface soil temperature differences with radiometric infrared (IR) surface temperature differences recorded at 4.7 +/- 0.4 micrometers and at 10.6 +/- 1.0 micrometers . By producing selective DBIR image ratio maps, we distinguish temperature-difference patterns from surface emissivity effects. We discuss temperature differences between buried object sites, filled hole sites (without buried objects), cleared (undisturbed) soil sites, and grass-covered sites (with and without different types of surface clutter). We compared temperature, emissivity-ratio, visible and near-IR reflectance signatures of surface objects, leafy plants and sod. We discuss the physical aspects of environmental, surface and buried target features affecting interpretation of buried targets, surface objects and natural backgrounds.

Paper Details

Date Published: 15 November 1993
PDF: 12 pages
Proc. SPIE 1942, Underground and Obscured Object Imaging and Detection, (15 November 1993); doi: 10.1117/12.160337
Show Author Affiliations
Nancy DelGrande, Lawrence Livermore National Lab. (United States)
Philip F. Durbin, Lawrence Livermore National Lab. (United States)
Michael R. Gorvad, Lawrence Livermore National Lab. (United States)
Dwight E. Perkins, Lawrence Livermore National Lab. (United States)
Gregory A. Clark, Lawrence Livermore National Lab. (United States)
Jose D. Hernandez, Lawrence Livermore National Lab. (United States)
Robert J. Sherwood, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 1942:
Underground and Obscured Object Imaging and Detection
Nancy K. Del Grande; Ivan Cindrich; Peter B. Johnson, Editor(s)

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