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The use associated with the optical frequency-domain reflectometry (OFDR) technology makes the spatial quality of this measurement method reach 15.13 µm, together with traditional and online dimension accuracies are 30 µm and 100 µm, respectively. The systematic error of the FBG length calculating system is within 30 µm. Considering that the size measurement is completed with a brief FBG in place of a much longer fiber, the dimension mistake caused by the time-varying heat or strain is significantly low in the rec