Design of focusing mechanism for off-axis TMA space camera

Hui-sheng, 杨会生 Yang; Yin-he, 张银鹤 Zhang; Fang-mao, 柴方茂 Chai; Hong, 徐宏 Xu; Zhi-lai, 李志来 Li; Ying-jun, 关英俊 Guan

doi:10.3788/ope.20132104.0948

Cited by 8 publications

(2 citation statements)

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“…A traditional focusing mechanism is composed of motors and transmission systems, mainly including worm and gear focusing mechanisms, a screw focusing mechanism, and a cam focusing mechanism. They provide a high accuracy and resolution, but at the cost of increasing the complexity and cost and reducing the reliability of the structure [ 5 , 6 , 7 , 8 , 9 ]. Some recent studies [ 10 , 11 , 12 , 13 , 14 ] have proposed improved focusing mechanisms, but they are still based on traditional focusing mechanisms and there are still movable motion pair, motion transformation, transmission error, friction, and wear problems.…”

Section: Introductionmentioning

confidence: 99%

Design of a Focusing Mechanism Actuated by Piezoelectric Ceramics for TMA Telescope

Chen

Zhu

2023

Sensors

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With the development of space telescopes towards high-resolution and intelligent imaging, the scale and complexity of the focal plane components of large-aperture, off-axis, three-mirror anastigmatic (TMA) optical systems are increasing. Traditional focal plane focusing technology reduces the system reliability and increases the scale and complexity. This paper proposes a three-degrees-of-freedom focusing system based on a folding mirror reflector, with a piezoelectric ceramic actuator as the driver. An environment-resistant flexible support was designed for the piezoelectric ceramic actuator through an integrated optimization analysis. The fundamental frequency of the large-aspect-ratio rectangular folding mirror reflector focusing mechanism was around 121.5 Hz. After testing, it was found to meet the requirements of the space mechanics environment. This system shows promise for application to other optical systems as an open-shelf product in the future.

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Section: Introductionmentioning

confidence: 99%

Design of a Focusing Mechanism Actuated by Piezoelectric Ceramics for TMA Telescope

Chen

Zhu

2023

Sensors

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“…The deviation may reduce the imaging resolution, and greatly affect the imaging quality of space telescope. Therefore, the focusing mechanism is necessary for the telescope to compensate the image plane position changes [1]. Focusing mirror assembly is set on a movable focusing mechanism.…”

Section: Introductionmentioning

confidence: 99%

Space focusing mirror assembly with flexure hinges

Guo

Dong

et al. 2014

SPIE Proceedings

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Focusing mirror assembly (FMA) is an important component of large space telescope. It can compensate the telescope's defocus caused by environmental factors. Telescope launching vibration and shock, as well as the structure stress of kinematic movement have great impact on focusing mirror assembly. To solve the problems of defocus result from vibration, shock and other environmental factors, a focusing mirror assembly with flexure hinge structure for space telescope is developed. Analysis and tests shows that the natural frequency of mirror assembly up to 130Hz. Before and after the tests, the shape RMS error variation of focusing mirror is less than 0.002λ (λ = 632.8nm). So the flexure support can well meet the requirements of mirror assembly structure performance.

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