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Optical fiber Bragg grating hydrogen sensor based on evanescent-field interaction with palladium thin-film transducer
Ist Teil von
Optics and lasers in engineering, 2009-10, Vol.47 (10), p.1018-1022
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2009
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Fiber Bragg grating (FBG) sensors in single-mode optical fibers are widely applied for measurement of temperature and strain. If exposing FBG sensors to an external analyte by planar side-polishing technique of the fiber, evanescent-field interaction yields a Bragg wavelength shift also by changing the refractive index of the analyte. Deposition of sensor-specific transducer layers on the side-polished fiber can specify this spectrally encoding and network-capable optochemical fiber Bragg grating refractometry to the monitoring of specific substances, absorbed gases and vapors. In this paper, the sensor principle is demonstrated for the example of a hydrogen gas sensor based on a palladium thin-film transducer. Hydrogen in 0.1–4% volume concentration range can be monitored by the spectral shift of the Bragg wavelength, which is caused by the decreasing complex refractive index of Pd with increasing absorption of hydrogen.