| 摘要 |
An optical well logging cable and method of fabrication is provided which utilizes the combination of optical fiber means having a proof test stress value of at least about 150,000 pounds per square inch with a surrounding and protecting arrangement of helically wound strength elements in a construction that minimizes the inelastic part of the cable elongation by minimizing the deformability of the structure within the arrangement of strength elements. This arrangement of strength elements includes two torque balancing layers wound in opposite helical directions. It is a feature of this invention that the construction has such a low permanent radial contraction under repeated loading to about 90% of the design breaking strength of the cable that its permanent elongation is no greater than about 0.4% and preferably 0.25% or less.
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