Microinterferometric Method For Relative Diameter Measurement Of Optical Fibres

A. Podmaniczky; M. Barabas

doi:10.1117/12.943722

27 March 1985 Microinterferometric Method For Relative Diameter Measurement Of Optical Fibres

A. Podmaniczky, M. Barabas

Proceedings Volume 0492, 1984 European Conf on Optics, Optical Systems, and Applications; (1985) https://doi.org/10.1117/12.943722
Event: 1984 European Conference on Optics, Optical Systems and Applications, 1984, Amsterdam, Netherlands

Abstract

A new measuring method for the determination of diameter variations of optical fibres is presented in this paper. This microinterferometric method is based on the detection of the Fabry-Perot-like resonances observable in the intensity of laser light backscattered from a fiber when the diameter changes. Two illuminating laser beams with different, but well--determined angles of incidence are used and in case of varying diameter two corresponding photodetectors generate measuring (cosine) and reference (sine) signals. Monitoring the sign of the reference signal the direction of the diameter changes can be determined. A half period of the measuring signal corresponds to ~0,1 μm diameter variation thus the resolution is even better. Experimental results for thin (~14 μm) doubly-clad fibres are described and the allowable tolerances of the angles of incidence calculated by ray tracing analysis are also presented for thin and thick fibres.

Citation Download Citation

A. Podmaniczky and M. Barabas "Microinterferometric Method For Relative Diameter Measurement Of Optical Fibres", Proc. SPIE 0492, 1984 European Conf on Optics, Optical Systems, and Applications, (27 March 1985); https://doi.org/10.1117/12.943722

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