Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1993-05-21
1995-06-20
Raevis, Robert
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
428344, 428354, 324519, G01L 100
Patent
active
054252750
ABSTRACT:
For detecting strains or breaks in the surface of a boat hull or other structure, the surface is covered with non-intersecting lengths of tape adhered to the surface. The tape has an inner strip of conductive elastomer and an outer strip of the same material, and between them a corrugated layer of copper foil. Both strips and the foil are insulated from each other and the outside. The strips and foil layer are connected to electrical resistance and capacitance measuring devices, which monitor any changes in the electrical properties of the tape lengths, caused by strain or breaking of the surface. Because of the corrugations, the foil will not change its resistance when the tape is elongated or compressed.
REFERENCES:
patent: 3058704 (1962-10-01), Bergstedt
patent: 3092250 (1963-06-01), Knutson et al.
patent: 3509942 (1970-05-01), Lindberg
patent: 4258100 (1981-03-01), Fujitani et al.
patent: 4348635 (1982-09-01), Wright et al.
Bachand Louis J.
Raevis Robert
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