Displacement measuring device using fiber Bragg grating sensor and sensitivity and durability adjustment method thereof

摘要

A displacement measuring apparatus using a fiber Bragg grating sensor and its sensitivity and durability adjustment method, when applied to a strain sensor using a fiber Bragg grating sensor, a case forming an outer shape, and a predetermined interval in the case The third and fourth optical fibers that are installed with different numbers of strands apart from each other, and are installed between the third and fourth optical fibers and fed to the third and fourth optical fibers. By providing a structure including a coupling means fixed at a certain position by tension, and selectively installing a fiber Bragg grating sensor in any one of a pair of optical fibers installed with different numbers of strands, The measurement sensitivity and durability of the strain sensor can be adjusted. [Selection] Figure 2