论文标题
监视Cherenkov望远镜事实的光学质量
Monitoring the optical quality of the FACT Cherenkov Telescope
论文作者
论文摘要
在伽马射线中，天文学事件具有在传感器平面上铸造环形图像的独特特征，从而形成了Cherenkov望远镜的众所周知的信号类别。然后，这些类似环形的图像可用于推断光点扩散函数（PSF），这是对成像反射器的光学质量的重要度量。在这篇论文中，观察到的muon环的“模糊性”被用作推断PSF的量度。但是，要对此“模糊性”参数进行良好的估计，需要准确地重建环中心和环半径本身，因此研究了环形特征提取的不同方法。要检查方法的准确性，进行了模拟和分析。测量PSF随着时间的推移的演变，可以识别其效果，并考虑到伽马射线后的伽马射线后的重建。作为此处介绍的方法的进一步好处，不需要其他观察来测量PSF，也不需要现场任何人类活动。提出了该方法的准确性以及事实与时间的PSF。
In gamma ray astronomy muon events have a distinct feature of casting ring-like images on the sensor plane, thus forming a well known signal class for Cherenkov telescopes. These ring-like images can then be used to deduce the optical point spread function (PSF) which is an important measure of the optical quality of the imaging-reflector. In this thesis the observed 'fuzziness' of muon rings is used as a measure to infer the PSF. However to have a good estimate for this 'fuzziness' parameter, the reconstruction of the ring center and ring radius itself needs to be accurate, so different methods of ring feature extraction are studied. To check for the accuracy of the methods a simulation and analysis is performed. Measuring the evolution of the PSF over time allows to identify its effects and take them into account for the reconstruction of gamma-rays postliminary. As a further benefit of the methods presented here no additional observations are needed to measure the PSF nor any human activity on site is required. The accuracy of the method, and the PSF of FACT vs. time are presented.
