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Jiang Fu, Shengzhi Liu, Weiwei Pan, Xiqing Hu System Engineering Department, Suzhou Nuclear Power Research Institute Suzhou, China fujiang2@cgnpc.com.cn, liushengzhi@cgnpc.com.cn, panweiwei@cgnpc.com.cn, huxiqing@cgnpc.com.cn Abstract—The integrating sphere gas chamber is selected as the core of the detection system, and a new algorithm is used to calculate hydrogen gas concentration. LED light source is selected as the detection system light source, and LED s ource wavelength is processed by fiber grating and pie zoelectric ceramic, then the light source corresponding to the hydrogen gas wavelength absorption peak is obtained. The light source passes through two integrating sphere chambers of the same state at the same time, because the light inte nsity of the light sour ce is absorbed by hydrogen gas and th e inner wall of the integrating sphere gas chamber, calculates the source signal by using an algorithm, and the real-time concentration of hydrogen gas obtained. Experiments show that the theoretical a lgorithm agrees well with the experimental results. Keywords—Hydrogen; Nuclear power plant; Optical fiber sensor; Integrating Sphere; containment; Fiber grating

Research of Hydrogen Concentration Measurement in Containment Vessel of Nuclear Power Plant