13 October 2010 Novel refractometer based on a phase-shift-adjustable fiber Bragg grating
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Proceedings Volume 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 765664 (2010); doi: 10.1117/12.865835
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China
Abstract
A novel method to measure refractive index by using a phase-shift-adjustable fiber Bragg grating (PSA-FBG) is proposed and demonstrated. The PSA-FBG was obtained by cutting a uniform FBG in the middle and introducing a small air gap between the two FBG halves as phase shift. Tested materials were filled into the small gap so that the quantity of the phase shift is related to refractive index of the tested material. Measurement of refractive index can be carried out by measuring wavelength variation of the phase shift-induced narrow transmission window of the PSA-FBG. Experimental results agree well with numerical analysis, showing a uniform refractive index sensitivity of 0.86 nm/u.r.i with resolution of 0.012.
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Wenjun Zhou, Xinyong Dong, Chun-Liu Zhao, Lan Li, Changyu Shen, Shangzhong Jin, "Novel refractometer based on a phase-shift-adjustable fiber Bragg grating", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 765664 (13 October 2010); doi: 10.1117/12.865835; https://doi.org/10.1117/12.865835
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KEYWORDS
Refractive index

Fiber Bragg gratings

Phase shifts

Liquids

Cladding

Fiber optics

Fiber optics sensors

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