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Proceedings Paper

Application study on giant-magnetostrictive actuator for driving segmented mirrors of very large astronomical telescope
Author(s): Bintang Yang; Dehua Yang; Guang Meng; Kunxin Chen; Yongjun Qi; Haiting Zhou; Peiyong Hou
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Paper Abstract

To realize active optics and further adaptive optics, high precision positioning technology with nanometer's resolution is believed to play a vitally important role in driving segmented mirrors of very large astronomical telescope (VLAT). The positioning actuators based on hydraulic technology, flexible-hinge principle and motor-reducer approach have been generally employed in VLAT to date. But such actuators prove to have the drawbacks such as hydraulic leakage, lagging, backlash and insufficient stroke, which could hardly be avoided in application of the above mentioned technologies. Naturally, these actuators can not satisfy the high-precise-positioning requirement for active and adaptive optics in VLAT. Aiming at upgrading the performance of actuators in VLAT, this paper presents the conceptual design of a small giant-magnetostrictive actuator which features stable nano-resolution positioning, large stroke, and instant response, high load capacity and free from backlash. Based on inchworm moving principle, the current research focuses on developing the elongating mechanism for longer step displacement with nanometric resolution and the clamping mechanism for large driving force. The feasibility of attaining a target actuator with 1000 microstrains and 4 nanometers resolution has been promised by relative experiments upon a Φ7×20 mm Terfenol-D rod in the authors' previous researches. Besides, the design of clamping mechanism as the other focus adopts magnetostrictive method to generate remarkable clamping force and to enable self-locking/pre-clamping behavior as well, which the other clamping methods are most unlikely to achieve. The current research is expected to contribute to meet the needs of high precision positioning for active and adaptive optics in VLAT.

Paper Details

Date Published: 1 November 2007
PDF: 8 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64230Z (1 November 2007); doi: 10.1117/12.779371
Show Author Affiliations
Bintang Yang, Shanghai Jiao Tong Univ. (China)
Dehua Yang, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Guang Meng, Shanghai Jiao Tong Univ. (China)
Kunxin Chen, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Yongjun Qi, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Haiting Zhou, Shanghai Jiao Tong Univ. (China)
Peiyong Hou, Northwestern Polytechnical Univ. (China)


Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering

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