High-resolution optical refractometer based on a long-period grating Michelson interferometer using a cross-correlation signal-processing method

Xinlei Zhou; Ke Chen; Xuefeng Mao; Wei Peng; Qingxu Yu

doi:10.1117/1.OE.54.12.126108

17 December 2015 High-resolution optical refractometer based on a long-period grating Michelson interferometer using a cross-correlation signal-processing method

Xinlei Zhou, Ke Chen, Xuefeng Mao, Wei Peng, Qingxu Yu

Author Affiliations +

Optical Engineering, Vol. 54, Issue 12, 126108 (December 2015). https://doi.org/10.1117/1.OE.54.12.126108

Abstract

We report a high-resolution optical refractometer based on the long-period grating Michelson interferometer. The interferometer phase shift depends on the refractive index that surrounds the fiber probe. A cross-correlation signal-processing method is used to demodulate the interferometer phase shift. Experimental results show that a resolution of 3×10⁻⁶ refractive index unit (RIU) can be obtained using this cross-correlation signal processing method. In addition, a measurement sensitivity up to 3×10³ deg/RIU is showed as the surrounding refractive index changing from 1.33 to 1.42. Such high-resolution and low-cost optical refractometers would find more applications in chemical or biochemical sensing fields.

Citation Download Citation

Xinlei Zhou, Ke Chen, Xuefeng Mao, Wei Peng, and Qingxu Yu "High-resolution optical refractometer based on a long-period grating Michelson interferometer using a cross-correlation signal-processing method," Optical Engineering 54(12), 126108 (17 December 2015). https://doi.org/10.1117/1.OE.54.12.126108

Published: 17 December 2015

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