5 October 2009 Evaluation and calibration of FBG-based relative humidity sensor designed for structural health monitoring
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Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 750310 (2009) https://doi.org/10.1117/12.835611
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom
Abstract
In this paper, the evaluation and testing of a fibre optic relative humidity sensor specifically designed for structural health monitoring is discussed in detail. The sensor is based on a polymer coated Fibre Bragg Grating (FBG) where with the increase of the moisture level, the polymer coating swells and thus applies strain to the FBG, causing a Bragg wavelength shift. The device is designed so that the temperature effect on the humidity sensor can be compensated by the inclusion of a second un-coated FBG packaged inside the same sensor probe. The sensor thus produced has been tested extensively and calibrated using both a humidity chamber and standard salt solutions. The probe has demonstrated a very good performance for relative humidity measurements.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Venugopalan, T. L. Yeo, F. Basedau, A. S. Henke, T. Sun, K. T. V. Grattan, W. Habel, "Evaluation and calibration of FBG-based relative humidity sensor designed for structural health monitoring", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750310 (5 October 2009); doi: 10.1117/12.835611; https://doi.org/10.1117/12.835611
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