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Fiber-Optic Temperature Sensor Using A Fabry–Pérot Cavity Filled With Gas Of Variable Pressure, Yujie Lu, Ming Han, Jiajun Tian
Fiber-Optic Temperature Sensor Using A Fabry–Pérot Cavity Filled With Gas Of Variable Pressure, Yujie Lu, Ming Han, Jiajun Tian
Department of Electrical and Computer Engineering: Faculty Publications
We report a high-temperature fiber-optic sensor based on measuring the spectral fringes of a Fabry–Pérot (FP) cavity on a microstructure fiber (MF) when the gas pressure in the cavity is varied through the holes in the MF. Theoretical analysis shows that the absolute temperature can be deduced from the slope of the spectral shift versus pressure curve, which requires no calibration and is insensitive to the FP cavity length variations. For demonstration, we fabricated a miniature sensor whose FP cavity is formed by sandwiching a fuse-silica tube between a side-hole MF and a solid-core fiber. Using the holes in the …
Fiber-Optic Pressure Sensor Based On Π-Phase-Shifted Fiber Bragg Grating On Side-Hole Fiber, Qi Zhang, Nan Liu, Thomas Fink, Hong Li, Wei Peng, Ming Han
Fiber-Optic Pressure Sensor Based On Π-Phase-Shifted Fiber Bragg Grating On Side-Hole Fiber, Qi Zhang, Nan Liu, Thomas Fink, Hong Li, Wei Peng, Ming Han
Department of Electrical and Computer Engineering: Faculty Publications
We present a fiber-optic pressure sensor based on a π-phase-shifted fiber Bragg grating (πFBG) fabricated on a side hole fiber. Due to the resonance effect of a πFBG, its reflection spectrum features two notches that are dramatically narrower than the line width of a regular FBG of similar length. The narrow spectral notches allow high-resolution measurement of their spectral separation, significantly improving the pressure detection limit (defined herein as the minimum detectable pressure change) compared to sensors based on a regular FBG of a similar length and on the same fiber. The πFBG demonstrated in this letter is 8.3 mm …