Reducing the negative effects of flywheel disturbance on space camera image quality using the vibration isolation method

doi:10.1007/s12200-017-0665-0

Front. Optoelectron.

2017, Vol. 10

Issue (1) : 80-88 https://doi.org/10.1007/s12200-017-0665-0

RESEARCH ARTICLE

Reducing the negative effects of flywheel disturbance on space camera image quality using the vibration isolation method

Changcheng DENG^1,²(

),Deqiang MU³,Junli GUO¹,Peng XIE¹

¹. Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
². University of Chinese Academy of Sciences, Beijing 100039, China
³. Changchun University of Technology, Changchun 130012, China

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Abstract

Although the performance of space cameras has largely improved, the micro vibration from flywheel disturbances still significantly affects the image quality of these cameras. This study adopted a passive isolation method to reduce the negative effect of flywheel disturbance on image quality. A metal-rubber shock absorber was designed and installed in a real satellite. A finite element model of an entire satellite was constructed, and a transient analysis was conducted afterward. The change in the modulate transfer function was detected using ray tracing and optical transfer function formulas. Experiments based on real products were performed to validate the influence of the metal-rubber shock absorber. The experimental results confirmed the simulation results by showing that the negative effects of flywheel disturbance on the image quality of space cameras can be diminished significantly using the vibration isolation method.

Keywords micro vibration modulate transfer function vibration isolation flywheel disturbance

Corresponding Author(s): Changcheng DENG

Just Accepted Date: 26 December 2016 Online First Date: 24 January 2017 Issue Date: 17 March 2017

Cite this article:

Changcheng DENG,Deqiang MU,Junli GUO, et al. Reducing the negative effects of flywheel disturbance on space camera image quality using the vibration isolation method[J]. Front. Optoelectron., 2017, 10(1): 80-88.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-017-0665-0
https://academic.hep.com.cn/foe/EN/Y2017/V10/I1/80

Fig.1 Metal-rubber shock absorber with eight damping pads

Fig.2 Structure of a damping pad

Fig.3 Positions of flywheels

Fig.4 Finite element model of the entire satellite

Fig.5 Test platform (a) and tested force result (b) of the flywheel

Tab.1 Loading conditions in the flywheel disturbance experiment

Fig.6 Arrangement of the six mirrors

Fig.7 Displacements in the y-axis without (a) and with (b) the metal-rubber shock absorber

Fig.8 Displacement in the z-axis without (a) and with (b) the metal-rubber shock absorber

Tab.2 Meanings of nodes

Fig.9 MTF calculation flowchart

Fig.10 Spot displacements in the focal plane along the x- (a) and y-axes (b)

Fig.11 Effect of vibration on MTF

Fig.12 Schematic of the satellite test setup

Fig.13 Steps of the knife edge image analysis method

Fig.14 MTF without flywheel disturbance and vibration isolation

Fig.15 MTF with flywheel disturbance and without vibration isolation

Fig.16 MTF with flywheel disturbance and vibration isolation

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