A novel nonlinear mirror structure which can increase the optical signal-to-noise ratio of a distributed fiber Raman temperature sensor is proposed, and 6 dB improvement of the optical signal-to-noise ratio is obtaine...A novel nonlinear mirror structure which can increase the optical signal-to-noise ratio of a distributed fiber Raman temperature sensor is proposed, and 6 dB improvement of the optical signal-to-noise ratio is obtained. With the assistance of the nonlinear mirror, we demonstrate that the spatial resolution of the sensor is improved from 3 m to 1 m, and the temperature accuracy is improved from ±0.6℃ to ±0.2℃. The theoretical analysis and the experimental data are in good agreement.展开更多
利用表面增强拉曼光谱(surface-enhanced Ram an scattering,SERS)研究了活性艳兰X-BR在银镜表面的吸附状态及其浓度变化对表面增强拉曼散射效应的影响,并探讨了活性艳兰X-BR在银镜表面的吸附作用特点和规律。实验结果表明,活性艳兰X-B...利用表面增强拉曼光谱(surface-enhanced Ram an scattering,SERS)研究了活性艳兰X-BR在银镜表面的吸附状态及其浓度变化对表面增强拉曼散射效应的影响,并探讨了活性艳兰X-BR在银镜表面的吸附作用特点和规律。实验结果表明,活性艳兰X-BR染料在银镜表面有明显的拉曼信号,表明该化合物能够吸附在银表面,获得了良好的增强效果,而且SERS强度随活性艳兰X-BR浓度的变化而改变。展开更多
基金supported by the National Natural Science Foundation of China under Grant No.60377021partially supported by Program for New Century Excellent Talents in University under Grant No. NCET-07-0152Sichuan Scientific Funds for Young Researchers under Grant No. 08ZQ026-012.
文摘A novel nonlinear mirror structure which can increase the optical signal-to-noise ratio of a distributed fiber Raman temperature sensor is proposed, and 6 dB improvement of the optical signal-to-noise ratio is obtained. With the assistance of the nonlinear mirror, we demonstrate that the spatial resolution of the sensor is improved from 3 m to 1 m, and the temperature accuracy is improved from ±0.6℃ to ±0.2℃. The theoretical analysis and the experimental data are in good agreement.
文摘利用表面增强拉曼光谱(surface-enhanced Ram an scattering,SERS)研究了活性艳兰X-BR在银镜表面的吸附状态及其浓度变化对表面增强拉曼散射效应的影响,并探讨了活性艳兰X-BR在银镜表面的吸附作用特点和规律。实验结果表明,活性艳兰X-BR染料在银镜表面有明显的拉曼信号,表明该化合物能够吸附在银表面,获得了良好的增强效果,而且SERS强度随活性艳兰X-BR浓度的变化而改变。
