Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1994-06-30
1995-10-31
Chilcot, Richard
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73770, 73775, 25022715, 25022716, 356 34, G02B 602, H01D 516
Patent
active
054619262
ABSTRACT:
An optical fiber strain sensor is provided which remembers the maximum stn a structure has experienced in a given timeframe. A reflective surface is fixed at one location on the structure, and a multi-mode optical fiber with a flat end is fixed at another location on the structure and is positioned so that its flat end is in contact with the reflective surface. A microbore capillary tube attached to the reflective surface encloses the fiber at its flat end and frictionally retains it in contact with the reflective surface. Increasing strain in the structure pulls the fiber end away from the reflective surface in proportion to the amount of strain; however, when strain is decreasing, the fiber buckles rather than moving closer to the reflective surface. Therefore, the maximum strain is reflected as a maximum distance between the fiber end and the reflective surface. When the maximum strain experienced is to be measured, light is launched into the free end of the fiber and reflected back through the fiber by the reflective surface. Its intensity is then detected and measured. The intensity of light transmitted to the detector will vary inversely with the distance between the fiber end and the reflective surface; therefore, this distance can be measured and correlated with strain to a high degree of accuracy.
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Bobb Lloyd C.
Krumboltz Howard D.
Chilcot Richard
Dombroske George M.
The United States of America as represented by the Secretary of
Tura James V.
Verona Susan E.
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