NDLI: Reflectometer distance measurement between parallel conductive plates

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Reflectometer distance measurement between parallel conductive plates

Content Provider	NASA Technical Reports Server (NTRS)
Author	Neece, Robert T. Hearn, Chase P.
Copyright Year	1995
Description	This report presents an analytic and experimental investigation of the measurement problem in which a reflectometer is used to determine the distance to a target that is a highly conductive surface parallel to the reflectometer antenna ground plane. These parallel surfaces constitute a waveguide (WG) which can contribute parasitic perturbations that seriously degrade the accuracy of the measurements. Two distinct parallel-plate-waveguide (PPWG) phenomena are described, and their effects on both frequency and time-domain reflectometers are considered. The time-domain processing approach was found to be superior to a representative frequency-domain phase-measurement approach because of less susceptibility to perturbations produced by edge reflections and immunity to phase capture. Experimental results are presented which show that a simple radiating system modification can suppress parallel-plate (PP) propagation. The addition of a thin layer of lossy mu-metal 'magnetic absorber' to the antenna ground plane allowed a measurement accuracy of 0.025 cm (0.01 in.) when a vector network analyzer (VNA) is used as a time-domain reflectometer.
File Size	100236
Page Count	24
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19960008569
Archival Resource Key	ark:/13960/t3b04338p
Language	English
Publisher Date	1995-11-01
Access Restriction	Open
Subject Keyword	Communications And Radar Optical Measurement Accuracy Microwave Reflectometers Waveguides Parallel Plates Reflection Distance Distance Measuring Equipment Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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