Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1983-09-26
1987-01-27
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324229, 324 585A, 73 32R, 73597, G01N 924, G01R 3312
Patent
active
046396691
ABSTRACT:
A procedure for nondestructively determining a physical characteristic of a test object (10) involves introducing an electromagnetic energy pulse into the test object, and measuring elapsed time before the signature of a time-dependent function of the energy thereby propagated through the test object (10) reaches a value larger than a pre-set threshold value. For example, the volume density of graphite fibers in a graphite-epoxy composite material can be determined by introducing a pulse of radio-frequency electromagnetic energy into the composite material, and by measuring the elapsed time before the voltage signature of the energy propagated through the composite material reaches a value larger than the threshold value.
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Howard Darryl A.
Shen Lawrence Y. L.
Edmonds Warren S.
Eisenzopf Reinhard J.
Lockheed Missiles & Space Company Inc.
Morrissey John J.
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