论文部分内容阅读
美国国家标准技术研究院的物理学家已发展一种用光参量下转换技术产生相关光子对来测量红外光谱绝对辐射度的方法，测量精度优于3％。与传统用辐射功率和光阑结构来间接评价光谱辐射度的技术相反，这是一种对辐射度直接灵敏的方法。这种双光子方法也可用高性能可见辐射测量探测
The physicists at the National Institute of Standards and Technology have developed a method for measuring the absolute radiance of the infrared spectrum by using photon-pair down-conversion techniques to generate photon pairs that measure better than 3%. Contrary to the traditional indirect use of radiant power and aperture structures to evaluate spectral radiance, this is a direct and sensitive method of radiometric sensitivity. This two-photon method can also be probed with high-performance visible radiation measurements