کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
746112 | 894443 | 2009 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Optical fiber Bragg grating hydrogen sensor based on evanescent-field interaction with palladium thin-film transducer Optical fiber Bragg grating hydrogen sensor based on evanescent-field interaction with palladium thin-film transducer](/preview/png/746112.png)
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.
Journal: Optics and Lasers in Engineering - Volume 47, Issue 10, October 2009, Pages 1018–1022