Xin Zhang,Zhi-quan Li,Yu-chao Sun,Kai Tong.An ammonia gas sensor with two chambers based on U-bending microring resonator[J].Optoelectronics Letters,2013,9(5):333-336 An ammonia gas sensor with two chambers based on U-bending microring resonator Author Name Affiliation E-mail Xin Zhang  College of Electrical Engineering, Yanshan University, Qinhuangdao, 066004, China    Zhi-quan Li  College of Electrical Engineering, Yanshan University, Qinhuangdao, 066004, China  lzq54@ysu.edu.cn  Yu-chao Sun  College of Electrical Engineering, Yanshan University, Qinhuangdao, 066004, China     Kai Tong  College of Electrical Engineering, Yanshan University, Qinhuangdao, 066004, China     Abstract:       A compact ammonia gas sensor with two gas chambers is proposed in this paper, whose core sensing device is a U-bending microring resonator. The waveguides of ring part and feedback part in this resonator are made of silicon on insulator (SOI) ridge waveguide covered with ZnO nanocrystals which are sensitive to ammonia gas. The sensor can measure two groups of gas samples simultaneously. By computer simulation, we obtain the clear sensitivity curves of two gas chambers in ammonia sensor when the gas concentration increases from 0 to 4‰. The gas concentrations in two chambers can be obtained from one output spectrum, which significantly reduces the material and time consumption. Hits: 7500 Download times: 404 View Full Text    Download reader