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Organisationseinheit der BAM
- 8 Zerstörungsfreie Prüfung (8)
- 8.6 Faseroptische Sensorik (7)
- 8.1 Sensorik, mess- und prüftechnische Verfahren (4)
- 6 Materialchemie (2)
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- 3.0 Abteilungsleitung und andere (1)
- 7 Bauwerkssicherheit (1)
- 7.1 Baustoffe (1)
- 7.4 Baustofftechnologie (1)
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.