Dual-band infrared capabilities for imaging buried-object sites

Nancy DelGrande; Philip F. Durbin; Michael R. Gorvad; Dwight E. Perkins; Gregory A. Clark; Jose D. Hernandez; Robert J. Sherwood

doi:10.1117/12.160337

15 November 1993 Dual-band infrared capabilities for imaging buried-object sites

Nancy DelGrande, Philip F. Durbin, Michael R. Gorvad, Dwight E. Perkins, Gregory A. Clark, Jose D. Hernandez, Robert J. Sherwood

Author Affiliations +

Proceedings Volume 1942, Underground and Obscured Object Imaging and Detection; (1993) https://doi.org/10.1117/12.160337
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

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.

Citation Download Citation

Nancy DelGrande, Philip F. Durbin, Michael R. Gorvad, Dwight E. Perkins, Gregory A. Clark, Jose D. Hernandez, and Robert J. Sherwood "Dual-band infrared capabilities for imaging buried-object sites", Proc. SPIE 1942, Underground and Obscured Object Imaging and Detection, (15 November 1993); https://doi.org/10.1117/12.160337

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