[IEEE 2020 IEEE 5th Optoelectronics Global Conference (OGC) - Shenzhen, China (2020.9.7-2020.9.11)] 2020 IEEE 5th Optoelectronics Global Conference (OGC) - Long-Period Fiber Grating Wide-Range pH Sensor Based on Polyvinyl Alcohol/Polyacrylic Acid Hydrogel Coating

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