Lasers, Fiber Optics, and Communications

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

[+] Author Affiliations
Xinlei Zhou, Ke Chen, Xuefeng Mao, Wei Peng, Qingxu Yu

Dalian University of Technology, School of Physics and Optoelectronic Technology, Linggong Road, Dalian 116024, China

Opt. Eng. 54(12), 126108 (Dec 17, 2015). doi:10.1117/1.OE.54.12.126108
History: Received August 14, 2015; Accepted November 16, 2015
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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 3×106refractiveindexunit (RIU) can be obtained using this cross-correlation signal processing method. In addition, a measurement sensitivity up to 3×103deg/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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

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", Opt. Eng. 54(12), 126108 (Dec 17, 2015). ; http://dx.doi.org/10.1117/1.OE.54.12.126108


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