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Real-time,continuous-wave terahertz imaging by a pyroelectric camera
作者: 杨珺, 阮双琛, 张敏 主题: 年份: 2008
摘要: <正>real-time,continuous-wave terahertz(thz)imaging is demonstrated.a 1.89-thz optically-pumped far- infrared laser is used as the illumination source,and a 124×124 element room-temperature pyroelectric camera is adopted as the detector.with this setup,thz images through various wrapping materials are shown.the results show that this imaging system has the potential applications in real-time mail and security inspection.
Improving the precision of fluorescence lifetime measurement using a streak camera
作者: 李恒, 邵永红, 王岩, 屈军乐, 牛憨笨 主题: 年份: 2010
摘要: streak camera has high temporal resolution and high sensitivity, and is a powerful tool in biomedical study to measure fluorescence lifetime and perform fluorescence lifetime imaging. however, nonuniformity of the gain in the streak tube and nonlinearity of the sweeping speed limit the precision of fluorescence lifetime measurement, particularly when fluorescence lifetimes are short. we have constructed a two-photon excitation fluorescence lifetime measurement system that is based on a synchroscan streak camera and have developed accordingly a method to correct the effect of gain nonuniformity and nonlinearity of sweeping speed on the measurement precision. a continuous-wave laser of high stability is used to calibrate the gain of the streak camera, and a fabry-perot etalon is used to calibrate the nonlinearity of the sweeping speed. fitting algorithms are used to correct the gain of the streak camera and nonlinearity of the sweeping speed respectively, which significantly improves the measurement precision o...
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