Twisted Macro-Bend Coupling Based Three-Dimensional Displacement Measurement Sensor Using Polymer Fiber

This paper highlights a novel approach towards a three-dimensional displacement measurement sensor. The designed sensor structure is simple, low cost, flexible, and easy to assemble. The sensor works on the twisted macro-bending coupling method. We realized displacement in three different dimensions using the single light transmitting fiber and the dimensions can be further extended by cascading. For sensing in each direction, the transmitting fiber was three-time circular-bended and twisted. The beam quality analyzer was used to analyze the coupling of optical power in receiving fibers when the displacement moves. The displacement has been achieved up to 140 mm in each direction with good consistency, and the system could operate up to 70 degrees C. In comparison with the other methods, the aforementioned method is well suited, holistic, and optimal. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement