Dr. Yunfeng Liu Profile

Dr. Yunfeng Liu

at Tsinghua Univ

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Proceedings Article | 6 December 2005 Paper

Optical fiber long-period grating-based Cu2+ measurement

Saying Dong, Yunfeng Liu, Xiaoqing Tan, Yanbiao Liao, Qian Tian, Ming Luo

Proceedings Volume 6019, 601923 (2005) https://doi.org/10.1117/12.629282

KEYWORDS: Coating, Sensors, Ions, Corrosion, Polymers, Optical fibers, Copper, Scanning electron microscopy, Light scattering, Microscopes

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The detection of the change of concentration of cupric ions (Cu²⁺) by long-period grating (LPG) sensors was presented in this paper. A polymeric affinity coating was chemically attached to the surface of the LPG sensor with reaction times of 4 hours, 8 hours, and 12 hours, which is characterized of its surface appearance by scanning electronic microscope (SEM). By comparing the surface appearance of the polymeric affinity coating, a proper reaction time was chosen as the final experimental condition. The optimal experimental condition was applied to the LPG sensor, which was first dipped into cupric sulfate (CuSO₄) solutions of different concentrations and then ethylene diamine tetraacetic acid (EDTA) solution. The intensity changes of typical transmission spectrum with Cu²⁺ concentrations were studied. Results showed that the intensity-based method of LPG sensor can reflect the change of the output light power and can be used to indicate the concentration of Cu²⁺.

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