کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8133364 | 1523414 | 2017 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High-precision Photogrammetric Surface Figure Measurements under Cryogenic Environment
ترجمه فارسی عنوان
اندازه گیری های دقیق سطح فتومتریک در محیط کریوژنیک
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
چکیده انگلیسی
Limited by the working temperature of the test equipment, most of high-precision surface figure measurement techniques cannot be put into application under a cryogenic environment. This paper reports the first attempt to measure the surface figure of a high-precision terahertz reflector panel under low temperatures based on photogrammetry. The measurement employs a high-resolution industrial camera sitting on the automatic testing platform which enables photos been taken in an automatic fashion inside a climate chamber. A repeatable accuracy of 2.1 μm (rms) is achieved under the cryogenic environment. Furthermore, the surface figure measured by a three-coordinate measuring machine under the room temperature is used to calibrate the thickness differences of the targets. By this technique, the surface figure of an aluminum prototype panel of the 5 meter Dome A Terahertz Telescope (DATE5) is measured from room temperature down to â55°C to obtain the rule of variation of surface deformation of the panel under low temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chinese Astronomy and Astrophysics - Volume 41, Issue 1, JanuaryâMarch 2017, Pages 136-148
Journal: Chinese Astronomy and Astrophysics - Volume 41, Issue 1, JanuaryâMarch 2017, Pages 136-148
نویسندگان
Lou Zheng, Qian Yuan, Fan Sheng-hong, Liu Chang-ru, Wang Hai-ren, Zuo Ying-xi, Cheng Jin-quan, Yang Ji,