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http://dx.doi.org/10.3807/KJOP.2017.28.6.281

Analysis of the Optical Measurement Error Induced by Vibration of the Optical Measurement Tower for Large Mirrors  

Kang, Pilseong (Advanced Instrumentation Institute, Korea Research Institute of Standards and Science)
Kim, Ohgan (Advanced Instrumentation Institute, Korea Research Institute of Standards and Science)
Ahn, Hee Kyung (Advanced Instrumentation Institute, Korea Research Institute of Standards and Science)
Yang, Ho-Soon (Advanced Instrumentation Institute, Korea Research Institute of Standards and Science)
Publication Information
Korean Journal of Optics and Photonics / v.28, no.6, 2017 , pp. 281-289 More about this Journal
Abstract
In the present research, the optical measurement error induced by vibration of the optical measurement tower for large mirrors at KRISS (Korea Research Institute of Standards and Science) is investigated. The vibrations of the tower structure, the interferometer, and the null lens are measured while the surface errors of the 600-mm-diameter on-axis aspheric mirror are measuring, under various environmental conditions. The increase of surface error induced by alignment error with respect to vibration is analyzed. As a result, the interferometer and the null lens, which are located on the top of the tower, are highly sensitive to vibration. Additionally, the surface error of the mirror is strongly increased when the vibration directions of the interferometer and the null lens are different. To reduce the alignment error and the surface error induced by vibration, the tower structure should be improved, to be insensitive to low-frequency vibration. Alternatively, optical measuring under stable conditions by vibration monitoring can improve the reliability of the surface error measurement.
Keywords
Interferometric measurement; Large mirror; Vibration response; Optical measurement tower;
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Times Cited By KSCI : 3  (Citation Analysis)
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