Microwave Coupled-Stripline Surface-Crack Detector.
Final rept. Sep 71-Jul 72,
STANFORD RESEARCH INST MENLO PARK CALIF
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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
- Test Facilities, Equipment and Methods