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Full Field Interferometry Applications to Army Problems,
ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ APPLIED SCIENCES DIV
Pagination or Media Count:
A total of sixteen M483A1 projectile bodies were inspected using speckle shearing interferometry. Four had machined defects of known dimensions and the balance were Magnaflux rejects. Six shells were determined to have defects detectable by speckle shearing interferometry, and the remaining six had keyway defects. All machined defects were located, with the sole exception of the 0.080 in. internal defects in the nose of one test shell which could not be seen even at 300 psi. All other defects in the sample could be seen with pressures of no more than 200 psi. Problems encountered included specular reflections which could be minimized by careful arrangement, and the problem of the keyway signature, which could be avoided by inspecting before the keyway was cut.
APPROVED FOR PUBLIC RELEASE