To obtain frequency-temperature compensation in a sapphire loaded cavity for hydrogen maser, a dielectric named SrTiO3 is employed whose temperature coefficient of permittivity is opposite to that of sapphire. Based o...To obtain frequency-temperature compensation in a sapphire loaded cavity for hydrogen maser, a dielectric named SrTiO3 is employed whose temperature coefficient of permittivity is opposite to that of sapphire. Based on theoretical analysis and computer simulation, a TE011 mode of a sapphire loaded cavity associated with two small rings of SrTiO3 with different thickness is solved, and the useful parameters that influence the temperature coefficient of cavity are calculated. Finally an experiment is brought forward and its results are very close to the computing results. When the thickness of SiTiO3 dielectric is 7 mm and the diameter is 17 mm in configuration b, the temperature coefficient of cavity is decreased from -58.8 kHz/K to -8.2 kHz/K and the quality factor is 40248.展开更多
高炉铁口铁水温度场(Molten iron temperature field,MITF)是表征铁水质量、判断炉温状况的重要信息.然而高炉出铁场动态粉尘的干扰使得铁水温度场的在线准确获取充满挑战.为此,首次提出基于红外与可见光视觉的高炉铁口铁水温度场检测方...高炉铁口铁水温度场(Molten iron temperature field,MITF)是表征铁水质量、判断炉温状况的重要信息.然而高炉出铁场动态粉尘的干扰使得铁水温度场的在线准确获取充满挑战.为此,首次提出基于红外与可见光视觉的高炉铁口铁水温度场检测方法,利用可见光图像为红外视觉测温提供先验粉尘干扰情况.首先,设计红外与可见光视觉协同的测温系统,同步获取高炉铁口铁水流的红外图像和可见光图像,铁水流红外图像表征铁水原始温度场信息,可见光图像为量化粉尘透射率提供数据基础.其次,构建基于色彩一致性的可见光图像中粉尘透射率估计模型和基于雾线先验的红外图像中粉尘透射率估计模型,得到红外波段下粉尘透射率.最后,结合红外辐射测温原理,构建基于粉尘透射率的红外测温近似补偿模型,实现铁水温度场的针对性补偿,获取误差较小的铁水温度.工业实验表明,相比于仅利用红外视觉测量铁水温度场,所提方法能够显著降低粉尘造成的测温误差,为高炉调控提供连续可靠的铁水温度数据.展开更多
文摘To obtain frequency-temperature compensation in a sapphire loaded cavity for hydrogen maser, a dielectric named SrTiO3 is employed whose temperature coefficient of permittivity is opposite to that of sapphire. Based on theoretical analysis and computer simulation, a TE011 mode of a sapphire loaded cavity associated with two small rings of SrTiO3 with different thickness is solved, and the useful parameters that influence the temperature coefficient of cavity are calculated. Finally an experiment is brought forward and its results are very close to the computing results. When the thickness of SiTiO3 dielectric is 7 mm and the diameter is 17 mm in configuration b, the temperature coefficient of cavity is decreased from -58.8 kHz/K to -8.2 kHz/K and the quality factor is 40248.
文摘高炉铁口铁水温度场(Molten iron temperature field,MITF)是表征铁水质量、判断炉温状况的重要信息.然而高炉出铁场动态粉尘的干扰使得铁水温度场的在线准确获取充满挑战.为此,首次提出基于红外与可见光视觉的高炉铁口铁水温度场检测方法,利用可见光图像为红外视觉测温提供先验粉尘干扰情况.首先,设计红外与可见光视觉协同的测温系统,同步获取高炉铁口铁水流的红外图像和可见光图像,铁水流红外图像表征铁水原始温度场信息,可见光图像为量化粉尘透射率提供数据基础.其次,构建基于色彩一致性的可见光图像中粉尘透射率估计模型和基于雾线先验的红外图像中粉尘透射率估计模型,得到红外波段下粉尘透射率.最后,结合红外辐射测温原理,构建基于粉尘透射率的红外测温近似补偿模型,实现铁水温度场的针对性补偿,获取误差较小的铁水温度.工业实验表明,相比于仅利用红外视觉测量铁水温度场,所提方法能够显著降低粉尘造成的测温误差,为高炉调控提供连续可靠的铁水温度数据.
