Abstract

Online monitoring of the polishing process of a D-shaped optical fiber sensor is performed in this paper by means of a chaotic correlation fiber loop ring down (CCFLRD) system. The ring down time of the autocorrelation coefficient decreases with the increase in polishing loss caused by different mesh sizes. A comparison of the sensitivity and resolution of the CCFLRD system with different polishing losses in the length of a fiber loop cavity are carried out. Online polishing in the fiber loop cavity with a very short length is proposed and demonstrated using different polishing mesh numbers to increase the sensitivity and resolution of the system. A high sensitivity of ${31.871}\;{\rm{n}}{{\rm{s}}^{- 1}}{{\rm{RIU}}^{- 1}}$ and resolution of ${{1}}{{{0}}^{- 4}}\;{\rm{RIU}}$ for refractive index sensing in the range of 1.3347–1.3721 correspond to different concentrations of sodium chloride.

© 2023 Optica Publishing Group

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