| A Computational Tool for Simulating Plane Wave Reflectance from Layered Lossy Media |
FEB 2005 |
66 pages |
| Authors:
John O. Curtis; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
|
 | A computational tool was developed to visualize radar reflection coefficients for a lossy, two-layered half-space soil geometry as a function of incidence angle. Allowable input parameters include radar frequency, top soil layer thickness, and the complex dielectric properties of both soil layers. The tool is a Microsoft Excel program that can operate on any Windows-based personal computer. |
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| Characterization of Soils from the Night Vision and Electronic Sensors Directorate Mine Lane Facility, Fort Belvoir, VA |
DEC 2004 |
172 pages |
| Authors:
John O. Curtis; Dan Leavell; Charles Weiss; Ryan North; Eric Smith; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS
|
| In support of mine detection sensor development programs at the U.S. Army Night Vision and Electronic Sensors Directorate, both onsite and laboratory measurements of soil properties were conducted on soils from the Fort Belvoir, VA, indoor mine lane facility. The lanes contain six distinctly different soils. In an effort to characterize these soils for both current and anticipated sensor technologies, measurement activities included onsite seismic refraction data collection and laboratory ... |
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| Computed-Tomography Imaging SpectroPolarimeter (CTISP) - A Passive Optical Sensor. Volume 1, Main Text and Appendix A; Volume 2, Appendix B |
SEP 2001 |
106 pages |
| Authors:
Hollis H. Bennett Jr.; Ricky A. Goodson; John O. Curtis; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
|
| An optical imaging system is described that simultaneously measures the wavelength dependence and polarization state dependence of light reflected from any surface. Potential applications of this technology include identifying man made objects from natural backgrounds, land cover classification, and a myriad of agricultural problems such as ground moisture measurements, estimation of crop health, etc. Polarization effects are quantified through the use of Stokes parameters. Both spatial and wavelength dependent data ... |
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| Computed-Tomography Imaging SpectroPolarimeter (CTISP) - A Passive Optical Sensor. Volume 2. Appendix B |
SEP 2001 |
214 pages |
| Authors:
Hollis H. Bennett Jr.; Ricky A. Goodson; John O. Curtis; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
|
| An optical imaging system is described that simultaneously measures the wavelength dependence and polarization state dependence of light reflected from any surface. Potential applications of this technology include identifying man made objects from natural backgrounds, land cover classification, and a myriad of agricultural problems such as ground moisture measurements, estimation of crop health, etc. Polarization effects are quantified through the use of Stokes parameters. Both spatial and wavelength dependent data ... |
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| An Overview of Jefferson Proving Ground UXO Technology Demonstration (Phase III) Contractor Performance Self-Assessments |
NOV 1999 |
105 pages |
| Authors:
John O. Curtis; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| The self-evaluations of four participants in the Jefferson Proving Ground, IN, UXO (unexploded ordnance) Technology Demonstrations, Phase III (1996), were reviewed to better understand the factors that control detection and/or discrimination of buried UXO by surface instruments. Among the conclusions drawn was the fact that each participant relied more heavily on human experience than model-driven data analysis to distinguish UXO from other objects. ... |
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| Site Characterization Investigations in Support of UXO Technology Demonstrations, Jefferson Proving Ground, Indiana |
SEP 1998 |
323 pages |
| Authors:
Jose L. Llopis; Janet E. Simms; Dwain K. Butler; John O. Curtis; Harold W. West; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
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| Geological, geophysical, environmental, and geotechnical investigations were performed to characterize three unexploded ordnance (UXO) test sites at Jefferson Proving Ground (JPG), Indiana. The purpose of the characterization is to support: (I) Phase IV demonstrator planning and results assessment; (2) Additional assessments of Phase I-III; (3) Future use of JPG sites; and (4) Comparisons of the JPG sites with other UXO and landmine test and ... |
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| Dielectric Properties of Soils, Fort A. P. Hill, VA -- 2nd Sample Set |
03 FEB 1997 |
162 pages |
| Authors:
John O. Curtis; Jerry L. Miller; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| This report contains dielectric property measurement results for soils. The original data were collected in the form of the real and imaginary parts of the complex dielectric constant versus frequency utilizing a Hewlett- Packard 851 OC Vector Network Analyzer System with an S-Parameter Test Set and a coaxial sample holder. Software developed at the U.S. Army Engineer Waterways Experiment Station was used to convert S-parameter measurements at selected frequencies into ... |
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| Dielectric Properties of Landmine Fillers (Waxes and Sands) |
14 JAN 1997 |
79 pages |
| Authors:
John O. Curtis; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| This report contains dielectric property measurement results for five different materials that have been used as fillers for various inert landmines. The original data were collected in the form of the real and imaginary parts of the complex dielectric constant versus frequency utilizing a Hewlett-Packard 8510C Vector Network Analyzer System with an S-Parameter Test Set and a coaxial sample holder. Software developed at the U.S. Army Engineer Waterways Experiment Station ... |
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| Dielectric Properties of Soils, Fort Carson, CO |
21 AUG 1996 |
385 pages |
| Authors:
John O. Curtis; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| This report contains dielectric property measurement results for soils. The original data were collected in the form of the real and imaginary parts of the complex dielectric constant versus frequency. The data collection apparatus was a Hewlet-Packard 85l0C Vector Network Analyzer System with an S- Parameter Test Set. Software developed at the U.S. Army Engineer Waterways Experiment Station was used to convert S-parameter measurements at selected frequencies into a complex ... |
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| A Prototype Microwave Probe and Reflectometer for In Situ Measurement of Soil Electrical Properties |
FEB 96 |
84 pages |
| Authors:
Joel B. Everett; John O. Curtis; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| A number of simple experiments were performed on a microwave reflectometer, operating at 60 MHz, to test the feasibility of its use as a tool for accurately measuring the complex electrical properties of soils. Such knowledge could be used to predict electromagnetic wave attenuation, the volumetric moisture contained within soil near the probe surface, and, through the relative changes in soil properties either over surface areas or as a function ... |
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| Effect of Soil Composition on Complex Dielectric Properties |
DEC 95 |
285 pages |
| Authors:
John O. Curtis; Charles A. Weiss Jr.; Joel B. Everett; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| An industry-standard vector network analyzer system was used to measure the complex reflection and transmission coefficients of 12 different fine-grained soils over a frequency range of 45 MHz to 26.5 GHz. Measurement variables included sample temperature (10, 20, 30, and 40 C), the amount of distilled, deionized water added to each soil sample, and the dry density of the soil in each sample holder (an uncontrolled parameter because of the ... |
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| Broadband Electrical Response of Organic Contaminants and Contaminant/ Soil Mixtures |
NOV 95 |
74 pages |
| Authors:
John O. Curtis; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| A laboratory measurement program was conducted to explore the fundamental electrical properties of organic contaminants and contaminant/soil mixtures. Complex reflection and transmission coefficients measured by a vector network analyzer system for samples contained in coaxial sample holders were used to generate electrical properties of the pure substances and the mixtures. The frequencies covered by these experiments ranged from 43 MHz to 26.5 GHz, and sample temperatures were held fixed at ... |
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| Microwave Dielectric Behavior of Soils. Report 1. Summary of Related Research and Applications |
DEC 93 |
119 pages |
| Authors:
John O. Curtis; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| As a precursor to developing a well-documented database of complex electrical properties of soils as a function of signal frequency, sample moisture, sample temperature, and soil type, a comprehensive study of existing data collection methodology and analytical modeling was undertaken. Of particular utility are chronological tables of experimental and analytical milestones as well as an extensive reference list. Several appendices are included that are helpful in understanding soil-electromagnetic wave interactions ... |
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| Microwave Dielectric Behavior of Soils. Report 2. A Unique Coaxial Measurement Apparatus |
DEC 93 |
49 pages |
| Authors:
John O. Curtis; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| A reflection/transmission laboratory apparatus and data collection methodology are described that can be used to measure the complex dielectric response of moist soils over the 100 MHz-18 GHz frequency range. The experimental setup includes a square cross-sectional coaxial sample holder, a vector network analyzer system for signal generation and detection, and an external bath for sample temperature control. Data collected on liquids whose dielectric response is well known verify that ... |
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| Microwave Dielectric Behavior of Soils. Report 3. Measurement and Modeling |
DEC 93 |
91 pages |
| Authors:
John O. Curtis; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| Making use of a coaxial reflection/transmission experimental procedure described in Report 2 of this series, a large number of complex dielectric property measurements were made of soil samples that ranged in texture from a poorly graded sand to a pure nonswelling clay mineral. Two methods of modeling the results are discussed. One is an equivalent circuit representation that accounts for both low-frequency conductivity and higher frequency dielectric relaxation losses in ... |
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| Environmental Characterization for Target Acquisition. Report 3. New Concepts for Evaluating Low-Grazing Angle Radar Measurements |
JUN 93 |
249 pages |
| Authors:
John O. Curtis; Bruce M. Sabol; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
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| In an attempt to develop a scene characterization methodology for long-range (2 to 7 km), low-grazing angle (<1O deg or .17 radians) active millimeter wave radar systems, a twofold approach is taken. First, slant range versus azimuth maps of radar backscatter measurements are filtered to collect statistics on the occurrence of target-like features and to relate those signatures to natural terrain conditions. Second, a prediction of radar return from the ... |
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| Environmental Characterization for the Sense and Destroy Armor (SADARM) Captive Flight Test, U.S. Army Yuma Proving Ground, Arizona, September 1990 |
MAY 93 |
132 pages |
| Authors:
John O. Curtis; Flynn A. Clark; Frank E. Perron Jr.; John E. Fiori; Bryan G. Harrington; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
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| This report provides an outline of the test site environmental characterization support completed at the U.S. Army Yuma Proving Ground for the Sense and Destroy Armor (SADARM) Captive Flight Test conducted during September 1990. Personnel from two U.S. Army Corps of Engineers laboratories, the U.S. Army Engineer Waterways Experiment Station and the Cold Regions Research and Engineering Laboratory, collected data during a 2-week period to both qualitatively and quantitatively define ... |
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| Twentynine Palms, California, Test Site Characterization |
FEB 92 |
43 pages |
| Authors:
John O. Curtis; Lee E. Tidwell; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| This report contains the results of a number of test site characterization measurements conducted at the US Marine Base in Twentynine Palms, California during the second week of October 1990. Work conducted during this field experiment included the collection of soil samples at various depths within the first meter of the ground surface that were later used for classification and petrography studies, the measurement of surface roughness at several locations, ... |
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| A One-Dimensional Plane Wave Propagation Code for Layered Rate-Dependent Hysteretic Materials |
SEP 1981 |
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| Authors:
John O. Curtis; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
 | Recent experimental data on soils showing that the application of loads with submillisecond rise times results in significant rate-dependent compressibility behavior have prompted the need for a one-dimensional plane wave propagation code for layered rate-dependent hysteretic or visco-compacting materials. An explicit one-dimensional finite element code--named ONED3P--was developed which incorporates a three-parameter (spring and dashpot) mechanical model consisting of a linear spring and dashpot in series coupled in parallel with a ... |
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| Effect of Backfill Property and Airblast Variations on the External Loads Delivered to Buried Box Structures. |
JUN 1978 |
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| Authors:
Jon E. Windham; John O. Curtis; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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| The results of analytical studies are presented in which (1) the SAP IV elastic finite-element (FE) code was used to perform modal analyses for a rectangular structure in vacuo and embedded in different backfill materials; and (2) a series of dynamic and static two-dimensional (2D), plane-strain, FE, structure-medium interaction (SMI) code calculations were performed using the HONDO code. The HONDO code SMI calculations were made to investigate the effect of ... |
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