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Parameter analysis of a pair of Bragg gratings with overlapping spectra for power measurement of small deformations

M. FAJKUS1,* , M. NOVAK2, J. NEDOMA2, E. HRUBESOVA1, P. MEC3, R. MARTINEK4

Affiliation

  1. Department of Department of Geotechnics and Underground Engineering, Faculty of Civil Engineering, VSB - Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic
  2. Department of Telecommunications, Faculty of Electrical Engineering and Computer Science, VSB - Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic
  3. Department of Building Materials and Diagnostics of Structures, Faculty of Civil E ngineering, VSB - Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic
  4. Department of Cybernetics and Biomedical Engineering, Faculty of Electrical Engineering and Computer Science, VSB - Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republ

Abstract

Bragg gratings belong to a group of single-point fibre optic sensors that can be simply multiplexed to achieve quasi-distributed sensing. As for single-point measurement, conversion of a spectral shift to a reflected power change allows replacing a complex and costly evaluation unit with a low-cost optical performance monitoring system. This article deals with the design of parameters of a pair of Bragg gratings with overlapping reflection spectra for transforming a spectral shift into a power change. The parameter analysis of Bragg gratings was performed in the OptiSystem SW environment to achieve a large measurement range with a linear response to the measurand. The measurement concept designed is immune to temperature changes. The functionality of the concept was experimentally verified during the measurement of deformation..

Keywords

Fibre Bragg grating, Sensor, OptiSystem, Power measurement, Passive detection scheme.

Citation

M. FAJKUS, M. NOVAK, J. NEDOMA, E. HRUBESOVA, P. MEC, R. MARTINEK, Parameter analysis of a pair of Bragg gratings with overlapping spectra for power measurement of small deformations, Optoelectronics and Advanced Materials - Rapid Communications, 13, 3-4, March-April 2019, pp.168-174 (2019).

Submitted at: June 26, 2018

Accepted at: April 8, 2019