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, H01J 516, G02B 602
Patent
active
054619270
ABSTRACT:
An optical fiber strain sensor is provided which remembers the maximum stn a structure has experienced in a given timeframe. A pair of multi-mode optical fibers with flat ends meet end-to-end within a microbore capillary tube with which the fibers have frictional contact. The fibers are fastened to the structure at two points a known distance apart on either side of the capillary tube. Increasing strain in the structure pulls the fiber ends apart in proportion to the amount of strain; however, when strain is decreasing, the fibers buckle rather than move closer together. Therefore, the maximum strain is reflected as a maximum distance between the fiber ends. When the maximum strain experienced is to be measured, the free end of one fiber is connected to a light source and the free end of the other fiber is connected to a detector. The intensity of light transmitted to the detector will vary inversely with the distance apart the fiber ends are; 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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