Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1989-01-25
1990-06-26
Sikes, William L.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
350 9615, 350 9630, 350 9633, 350320, 25022714, 65 41, 65 42, 65 31, 156625, 156632, 156158, 21912168, G02B 602, H01J 516, C03B 2320, B44C 122
Patent
active
049366491
ABSTRACT:
A damage detection and evaluation system utilizes optical fibers to detect and assess damage to a structure. The optical fibers are intermittently etched in a controlled manner to weaken them so they fracture when a desired load is applied to the structure. Where visual inspection of the optical fibers is used to check for damage, a reference set of optical fibers is used. Where photodetection is used and minimal connections to the structure are required, one end of the optical fiber is made reflecting so an optical connection is only made to the other end. To further simplify the connection, a single input/output optical connection to a demultiplexing/multiplexing chip mounted on or within the structure is provided. Where orthogonal grids of fibers are not possible, the invention provides interdigitated optical fibers and volume backscattering to locate the position of the first fracture along the length of the optical fiber. The entire periphery of a damaged area can then be determined with a set of such interdigitated optical fibers. Again, a single optical interface to the structure can be provided using a demultiplexing/multiplexing chip. In the case of composite materials, the optical fibers are located between specified plys and at a specified orientation for optimum sensitivity.
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Fibre Optic Damage Detection in Composite Structures by Hofer-Published Sep. 1987 Issue of Composites.
Glossop Neil D. W.
Hogg W. Dayle
Lymer John D.
Measures Raymond M.
Tennyson Roderick C.
Healy Brian M.
Sikes William L.
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