| 其他摘要 | One of the major differences between ground-based telescopes and space-based telescopes is the influence of the atmosphere. When distant starlight passes through the atmosphere, the presence of atmospheric turbulence leads to degradation of the image quality in four main ways: star jitter, image plane distortion, image quality blurring and image flicker. Therefore, the selection of a suitable site for a ground-based telescope is an extremely important fundamental task for any size of ground-based telescope.Once the telescope is built at a good astronomical site, the location and height of the telescope can no longer be changed. At this point, the dome local seeing have a serious impact on a telescope and need to be measured and improved manually. At present, there is a lack of measurement instruments for the local seeing represented by the dome local seeing other than the meteorological method based on the Micro-thermal Meter.For years, researchers have focused on studying the effects of whole-atmosphere turbulence on telescopes and have gained a deep understanding of whole-atmosphere turbulence, but there is a lack of separate and accurate optical evaluation measurements of local turbulence. Due to the unique characteristics of the laser, such as high intensity, high monochromaticity, high coherence, and high directionality, it has a series of advantages such as large capacity, narrow beam, high gain, fast speed, strong anti-interference, and good confidentiality, Thus laser detection has become a new direction of atmospheric detection. We developed an instrument to measure local turbulence using multiple non-redundant baseline lasers based on the theory of atmospheric turbulence. Compared with the traditional Micro-thermal Meter, this instrument can measure not only the atmospheric coherence length and seeing of local turbulence, but also wind speed, outer scale, and coherence time turbulence parameters. Moreover, the instrument is convenient and flexible, and the construction method can be changed according to the actual configuration; after slight modification, the instrument can be used to measure local turbulence such as mirror turbulence and tube turbulence. It not only has a broad application prospect but also has good research significance and reference value for local turbulence measurement in China. |
修改评论