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- W2591711879 abstract "Abstract 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 μ m (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 −55°C to obtain the rule of variation of surface deformation of the panel under low temperatures." @default.
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- W2591711879 date "2017-01-01" @default.
- W2591711879 modified "2023-09-23" @default.
- W2591711879 title "High-precision Photogrammetric Surface Figure Measurements under Cryogenic Environment" @default.
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- W2591711879 doi "https://doi.org/10.1016/j.chinastron.2017.01.006" @default.
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