Effective refractive index modulation based optical fiber humidity sensor employing etched fiber Bragg grating

Pathi Mundendhar; Sunil K. Khijwania

doi:10.1117/12.2195225

28 September 2015 Effective refractive index modulation based optical fiber humidity sensor employing etched fiber Bragg grating

Pathi Mundendhar, Sunil K. Khijwania

Author Affiliations +

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96343V (2015) https://doi.org/10.1117/12.2195225
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

Relative humidity (RH) sensor employing etched fiber Bragg grating (FBG) is reported where RH variations are captured using effective-index-modulation, rather than traditional strain-modulation. Additionly, linear sensor response over wide dynamic range with optimum characteristics is focused. Comprehensive experimental investigation is carried out for the sensor that comprises uniformly etched cladding in the FBG region. Obtained results are observed to be in agreement with the theoretical analysis. Sensor response is observed to be linear over dynamic range 3–94%RH with ~ 0.082 pm/%RH sensitivity, ~0.6%RH resolution, ~ ±2.5%RH accuracy, ~ ±0.2 pm average discrepancy and ~ 0.2s response time during humidification/desiccation.

Citation Download Citation

Pathi Mundendhar and Sunil K. Khijwania "Effective refractive index modulation based optical fiber humidity sensor employing etched fiber Bragg grating", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96343V (28 September 2015); https://doi.org/10.1117/12.2195225

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