17 December 2015 High-resolution optical refractometer based on a long-period grating Michelson interferometer using a cross-correlation signal-processing method
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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 3×10−6   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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Xinlei Zhou, Xinlei Zhou, Ke Chen, Ke Chen, Xuefeng Mao, Xuefeng Mao, Wei Peng, Wei Peng, Qingxu Yu, 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 . Submission:
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