Research on the measurement technology of effective arm length of swing arm profilometer

Lin Chen; Hongwei Jing; Zhongwei Wei; Jie Li; Xuedong Cao

doi:10.1117/12.2070673

2 September 2014 Research on the measurement technology of effective arm length of swing arm profilometer

Lin Chen, Hongwei Jing, Zhongwei Wei, Jie Li, Xuedong Cao

Proceedings Volume 9280, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 92800P (2014) https://doi.org/10.1117/12.2070673
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

When the swing arm profilometer(SAP) measuring the mirror, the effective arm length of SAP which haves an obvious influence on the measurement results of the mirror surface shape needs to be measured accurately. It requires the measurement uncertainty of the effective arm length to reach 10μm in order to meet the measurement requirements, in this paper, we present a kind of technology based on laser tracker to measure the effective arm length of SAP. When the swing arm rotates around the shaft axis of swing arm rotary stage, the probe and two laser tracker balls form three sections of circular arc around the shaft axis of swing arm rotary stage in space. Laser tracker tracks and measures the circular arcs of two laser tracker balls, the center coordinates of the circular plane of circular arc can be calculated by data processing. The linear equation that passes through the two center coordinates is the equation of the shaft axis of rotary stage, the vertical distance from the probe to the shaft axis of rotary stage which can be calculated refer to the equation from the point to the line is the effective arm length. After Matlab simulation, this measurement method can meet the measurement accuracy.

Citation Download Citation

Lin Chen, Hongwei Jing, Zhongwei Wei, Jie Li, and Xuedong Cao "Research on the measurement technology of effective arm length of swing arm profilometer", Proc. SPIE 9280, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 92800P (2 September 2014); https://doi.org/10.1117/12.2070673

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