Design and Fabrication of Stripline Microwave Surface-Crack Detector for Projectiles
Final rept. 16 Jul 1973-17 Jul 1974
STANFORD RESEARCH INST MENLO PARK CA
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A self-contained coupled-stripline crack detector was built, tested, and evaluated. This detector makes use of the capability of two coupled striplines to support two orthogonal modes. The two conductors, printed on a dielectric sheet whose other side is clad with metal, scan the metal surface at a close distance. The metal surface then becomes part of the RF ground conductor. The two striplines are excited in one mode and a crack in the metal surface couples energy into the other mode, because the crack upsets the symmetry of the coupled lines. A complete detector system was built consisting of RF source, modulator, coupled-stripline detector with even-mode exciter and odd-mode receiver, and the necessary low-frequency amplifiers and detectors. Extensive measurements were performed with a planar detector on planar plates and a curved detector on 175-mm artillery shell bodies.
- Test Facilities, Equipment and Methods
- Ammunition and Explosives