Sensing fiber selection for point displacement measuring with distributed optic fiber sensor

Distributed optical fiber sensors (DOFS) allow for distributed strain sensing and can be installed to function as extensometers measuring point-displacements. This paper discusses the metrics of optimal selection point-displacement measuring. Key include physical structure, mechanical parameters light transmission coefficients. Calibration tests verification properties are designed results four types presented. Finally, creep relaxation behavior fibers is discussed based on manual tension test results, a quantification model proposed assess induced measurement error fiber. The maximum (absolute) two common used in point displacement measurements determined below 8%, study shows that pretensioning helps reduce such errors.