Optics: measuring and testing – Material strain analysis
Patent
1983-03-15
1985-11-26
McGraw, Vincent P.
Optics: measuring and testing
Material strain analysis
356 731, G01B 1102
Patent
active
045551758
ABSTRACT:
Compressive strain in cabled optical fibers can cause buckling of the fibers and resulting microbending loss. To measure the longitudinal compression in cabled optical fibers, a modulated laser beam is directed through a first fiber and looped back to the origin by a second fiber. Next, the cable is stretched until tensile strain is indicated by a change in phase of the modulated signal. The amount of stretching required indicates the degree of compression on the fibers in the unstretched cable, and hence the amount of excess length of fiber in the cable. To measure excess fiber in relatively long lengths of cable, a portion of the cable can remain reeled, and the strain applied to the unreeled portion. A correction factor can be determined for slippage between the fiber and sheath in the reeled portion.
REFERENCES:
"Measurement of Strain Relief in an Experimental Optical Fibre Cable," Electronics Letters, vol. 18, G. R. Bandurek et al., 1982, pp. 263-265.
"Single-Ended On-Line Extrusion-Coating Induced Strain Measurements in Optical Fibers Using Phase Delay," 3rd International Conference on Integrated Optics and Optical Communication, R. Kashyap et al., 1981, (One page).
"Strain Measurement in Optical Fiber Cable Using Resistance Wire," Japanese Journal of Applied Physics, vol 20, 1981, Y. Katsuyama et al., pp. 25-30.
"Measurements of Strain in Optical Fiber Cables Using a Commercial Distance Meter," 8th European Conference on Optical Communication, D. L. Philen et al., 1982, (4 pages).
"Electronic Distance Measurement for Industrial and Scientific Applications," Hewlett-Packard Journal, D. E. Smith, 1980, pp. 2-19.
Gardner William B.
Patel Parbhubhai D.
Philen Dan L.
Santana Manuel R.
AT&T Bell Laboratories
Fox James H.
McGraw Vincent P.
Turner S. A.
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