Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1995-06-07
1998-05-12
Dougherty, Elizabeth L.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73786, G01L 124
Patent
active
057509018
ABSTRACT:
A measurement optical fiber is placed into contact with a geological structure, and a reference optical fiber of about the same length is not contacted to the geological structure. An input beam of light is transmitted down the lengths of the measurement and reference optical fibers, and the interference fringes formed between the reflected beams in the two optical fibers are counted to determine the geological displacement, and thence the geologic strain, experienced by the measurement optical fiber. Preferably, multiple pairs of the measurement and reference optical fibers are used, the optical fibers of the various pairs being of different lengths. The difference in displacement measured by any two pairs is a measure of the geological strain in the region between the ends of the two pairs. The multiple pairs are conveniently provided in two optical fiber cables, a measurement cable which contacts the geological structure and a reference cable which extends parallel and adjacent to the measurement cable.
REFERENCES:
patent: 4654520 (1987-03-01), Griffths
patent: 4788868 (1988-12-01), Wilk
patent: 5148017 (1992-09-01), Wolff et al.
patent: 5182449 (1993-01-01), Johnson et al.
patent: 5381492 (1995-01-01), Dooley et al.
Bates Kenn S.
Shih I-Fu
Vali Victor
Denson-Low W. K.
Dougherty Elizabeth L.
Grunebach G. S.
Hughes Aircraft Company
Sales M. W.
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