'In situ' EM Soil Properties Measurement: Instrumentation, Theory, and Method. Volume III.
Final rept. 15 Feb 73-30 Sep 74,
SOUTHWEST RESEARCH INST SAN ANTONIO TEX
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The purpose of this program was to develop field instrumentation to measure in situ electromagnetic EM soil properties required for land mine detection evaluation. An objective was to provide an rf measurement method for the frequency range 300-4000 MHz that would require the least amount of disturbance of the soil in its natural environment. After both theoretical and experimental analyses, special coaxial soil probes were designed, and two portable field kits were assembled and delivered to the Army. EM soil properties were obtained by first inserting a coaxial soil probe into the soil the partially soil-filled coaxial waveguide was then treated as a lossy transmission line terminated in an open circuit. Measured values of the driving point impedance provided the necessary information to allow the EM soil properties to be derived using classical transmission line equations. A computer program was developed to obtain the necessary solutions.
- Soil Mechanics
- Magnetic and Electric Field Detection and Detectors