Sensor óptico de curvatura baseado em técnica de descasamento de diâmetro de núcleo aplicado para medição de escoamento

Abstract

This work aims to study the propagation of optical power in the structure based on core diameter mismatch technique (CDM), Singlemode-Multimode-Singlemode-Multimode- Singlemode (SMSMS), with curvature aiming at application as the low cost alternative, easy fabrication and acceptable sensitivity for flow measurement in pipes. The two multimode sections present in the sensor act as a coupler and re-coupler of core and cladding modes, and the singlemode section, in the middle, acts as a sensing element. The structure was analyzed by experimental measurements and numerical simulations. Experimental analyzes were performed for curvature and flow measurement. The structure while stretched presents an interference pattern and when it is bent other patterns are generated. Numerical simulation was performed using the finite difference beam propagation method using software BeamProp 9.0 from the company RSoft TM. Results demonstrate that applicability as curvature sensors and flow measurement is possible.