Optimal Design of MPD based fiber optic strain sensors andcomparison of power-meter and CCD camera based architectures

摘要

In this work, we consider optimal design of Modal Power Distribution (MPD) based fiber optic sensors and comparepower-meter and CCD camera based techniques for strain measurements. To the best of authors' knowledge, majority ofthe power-meter based MPD sensors use a single photo detector, and there is only one known work where two photo-detectors are used with no optimization on photo-detector locations. Optimal measurement location selection problemand comparison of power-meter and CCD camera based sensor measurements were both addressed in this work. Basedon our experimental data, more than 100% increased sensitivity is observed in the newly designed optimal strain sensor.It was also shown that there is a fixed nonlinear relationship between CCD based and power-meter based fiber opticsensor measurements. This allows estimation of power-meter measurements utilizing CCD camera images, which in turnsimplifies the optimal detector location selection problem.