Share Email Print
cover

Proceedings Paper

Annular force based variable curvature mirror aiming to realize non-moving element optical zooming
Author(s): Hui Zhao; Xiaopeng Xie; Jingxuan Wei; Guorui Ren; Zhihai Pang; Liang Xu
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Recently, a new kind of optical zooming technique in which no moving elements are involved has been paid much attention. The elimination of moving elements makes optical zooming suitable for applications which has exacting requirements in space, power cost and system stability. The mobile phone and the space-borne camera are two typical examples. The key to realize non-moving elements optical zooming lies in the introduction of variable curvature mirror (VCM) whose radius of curvature could be changed dynamically. When VCM is about to be used to implement optical zoom imaging, two characteristics should be ensured. First, VCM has to provide large enough saggitus variation in order to obtain a big magnification ratio. Second, after the radius of curvature has been changed, the corresponding surface figure accuracy should still be maintained superior to a threshold level to make the high quality imaging possible. In this manuscript, based on the elasticity theory, the physical model of the annular force based variable curvature mirror is established and numerically analyzed. The results demonstrate that when the annular force is applied at the half-the-aperture position, the actuation force is reduced and a smaller actuation force is required to generate the saggitus variation and thus the maintenance of surface figure accuracy becomes easier during the variation of radius of curvature. Besides that, a prototype VCM, whose diameter and thickness are 100mm and 3mm respectively, have been fabricated and the maximum saggitus variation that could be obtained approaches more than 30 wavelengths. At the same time, the degradation of surface figure accuracy is weakly correlated to the curvature radius variation. Keywords: optical zooming; variable curvature mirror; surface figure accuracy; saggitus;

Paper Details

Date Published: 8 October 2015
PDF: 12 pages
Proc. SPIE 9678, AOPC 2015: Telescope and Space Optical Instrumentation, 967807 (8 October 2015); doi: 10.1117/12.2197408
Show Author Affiliations
Hui Zhao, Xi'an Institute of Optics and Precision Mechanics (China)
Xiaopeng Xie, Xi'an Institute of Optics and Precision Mechanics (China)
Inner Mongolia Univ. (China)
Jingxuan Wei, Xidian Univ. (China)
Guorui Ren, Xi'an Institute of Optics and Precision Mechanics (China)
Zhihai Pang, Xi'an Institute of Optics and Precision Mechanics (China)
Liang Xu, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 9678:
AOPC 2015: Telescope and Space Optical Instrumentation
Bin Xiangli; Dae Wook Kim; Suijian Xue, Editor(s)

© SPIE. Terms of Use
Back to Top