Fiber Optic Fabry-Perot Micro-Displacement Sensor Based on Low-Cost Polymer Film

TLDR: In this article, a thin-film polymer and multimode fiber optic interaction-based low-cost optical fiber displacement sensor is presented, which is operated by deflecting a commercially Mylar Ⓡ polymer film using multimode optical fiber.

Abstract: This manuscript experimentally validates a thin-film polymer and multimode fiber optic interaction-based low-cost optical fiber displacement sensor. The sensing setup is operated by deflecting a commercially Mylar Ⓡ polymer film using multimode optical fiber. The sensor exhibits a higher sensitivity of 24nm/ $\mu \text{m}$ and resolution of 41.6nm. The sensor’s analyses also demonstrate good polynomial approximation, with a maximal adjusted square of $\text {R}={0.9801}$ , and high stability, in which minimal power (0.4dB-Hour) and wavelength ( $0.05~\mu \text{m}/^{\circ }\text{C}$ ), and this parameter can be distinguished considering the wavelength shifting direction. The simplicity of the scheme, as well as the cost of the elements involved, make this technique a reliable alternative to detect micro-displacements.