Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-07-14
1997-07-08
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250226, 385 12, G01J 318
Patent
active
056464002
ABSTRACT:
A nondestructive method and apparatus for optical detection and monitoring corrosion in structures normally inaccessible to light and observation. An optical fiber coated with a corrosion sensitive compound is embedded in the structure. Tapped Bragg gratings of different Bragg periods are spaced along the fiber and refract a narrow bandwidth component of a broad beam light pulse transmitted through the fiber. Due to corrosion, the refracted components are reflected by the compound and their amplitudes are detected and displayed for each narrow bandwidth.
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R. E. Johnson, V. S. Agarwala, Material Performance, p. 25, Apr. 1994.
A. W. Snyder, J. D. Love, "Optical Waveguide Theory", Chapman and Hall pu 1983, p. 460.
S. M. Melle K. Liu, R. M. Measures, Applied Optics ,vol. 32, p. 3601 (1993).
I. Perez, V. Agarwala, W. R. Scott, "Bragg Grating Corrosion Sensor", Proceedings of the 19th Progress in Quantitative Nondestructive Evaluation, Iowa State U., Jul.-Aug. 1994, presentation on 31 Jul. 1994.
Agarwala Vinod S.
Perez Ignacio M.
Billi Ron
Pyo Kevin
The United States of America as represented by the Secretary of
Verona Susan E.
Westin Edward P.
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