We report a reflection-based phase-shifted long period fiber grating (PS-LPFG) and demonstrate its capability for simultaneous measurement of temperature and external reflective index (RI). The sensor device comprises a grating directly written by CO2 laser and silver-coated end face. A π-shifted LPFG is presented with two attenuation bands through its reflection spectrum. These two bands have different sensitivity towards temperature and external RI that can be used for simultaneous measurement of the two variables. The experimental results show that this probe-type PS-LPFG performs well in terms of linearity and sensitivity.
J. Huang et al., "Reflection-Based Phase-Shifted Long Period Fiber Grating for Simultaneous Measurement of Temperature and Refractive Index," Optical Engineering, vol. 52, no. 1, SPIE, Jan 2013.
The definitive version is available at https://doi.org/10.1117/1.OE.52.1.014404
Electrical and Computer Engineering
National Energy Technology Laboratory (U.S.)
Keywords and Phrases
Attenuation bands; Long period fiber grating; Phase shifted; Reflection spectra; Reflective index; Sensor device; Simultaneous measurement; Two bands, Carbon dioxide; Phase shift; Sensors, Refractive index
International Standard Serial Number (ISSN)
Article - Journal
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