Evaluation and calibration of FBG-based relative humidity sensor designed for structural health monitoring

T. Venugopalan; T. L. Yeo; F. Basedau; A. S. Henke; T. Sun; K. T. V. Grattan; W. Habel

doi:10.1117/12.835611

5 October 2009 Evaluation and calibration of FBG-based relative humidity sensor designed for structural health monitoring

T. Venugopalan, T. L. Yeo, F. Basedau, A. S. Henke, T. Sun, K. T. V. Grattan, W. Habel

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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.

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T. Venugopalan, T. L. Yeo, F. Basedau, A. S. Henke, T. Sun, K. T. V. Grattan, and 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); https://doi.org/10.1117/12.835611

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