Accession Number:

ADA001624

Title:

Design and Fabrication of Stripline Microwave Surface-Crack Detector for Projectiles

Descriptive Note:

Final rept. 16 Jul 1973-17 Jul 1974

Corporate Author:

STANFORD RESEARCH INST MENLO PARK CA

Personal Author(s):

Report Date:

1974-09-01

Pagination or Media Count:

91.0

Abstract:

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.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Ammunition and Explosives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE