Accession Number : AD0749799

Title :   Microwave Coupled-Stripline Surface-Crack Detector.

Descriptive Note : Final rept. Sep 71-Jul 72,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : Roberson,Lloyd A. ; Gysel,Ulrich H.

Report Date : AUG 1972

Pagination or Media Count : 44

Abstract : A microwave coupled-stripline surface-crack detector was designed and built using the capability of a pair of conductors over ground to support propagation in two orthogonal TEM modes. For this crack-detector application, the two conductors are flat strips printed on a dielectric sheet. The other side of the dielectric sheet is clad with metal at RF ground potential. The printed stripline assembly is used to scan a surface to be examined for cracks, which is also at RF ground potential. When the stripline approaches a surface crack, the crack couples energy from one mode into the other because the symmetry of the geometry is upset. Design information was generated using a sophisticated computer program that calculates a quantity proportional to the crack-produced coupling of power from one mode to the other. (Author)

Descriptors :   (*NONDESTRUCTIVE TESTING, CRACKS), (*DETECTORS, CRACKS), MICROWAVES, STRIP TRANSMISSION LINES, SURFACE PROPERTIES

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE