Dr. Dewei Sun Profile

Dr. Dewei Sun

at Harbin Institute of Technology

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Proceedings Article | 6 August 2009 Paper

Design and analysis of the flexible support structure of a space infrared detector

Dewei Sun, Guangyu Zhang, Ning Guo

Proceedings Volume 7383, 73832U (2009) https://doi.org/10.1117/12.833409

KEYWORDS: Infrared detectors, Sensors, Composites, Electromagnetism, Electromagnetic radiation, Vibration isolation, Infrared sensors, Infrared radiation, Optical components, Infrared cameras

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A flexible support structure of space infrared detector is presented so as to reduce the impacts of mechanical vibration, electromagnetic interference and temperature shift from outside environment. According to technical requirements of the infrared detector, the flexible support structure is designed, which mainly consists of two components: one component is planted in the outside of the infrared detector to shield electromagnetic wave called shield cover; the other component is a soft rubber ring, which can connect the shield cover to bracket forming a flexible support. In order to demonstrate its effectiveness on reducing vibration, parameter identification and dynamic analysis of this structure are carried out to calculate the acceleration of detector under sine vibration with different frequency. Then a new type composite material is used to produce the shield cover, which has some advantages such as lighter weight, higher stiffness and function of electromagnetic shielding. Besides, the soft rubber ring is made of a special rubber called XM-31. Not only can this rubber isolate the vibration, but insulate the heat, which will further improve the performance of detector. The flexible support structure has an important application value in the field of infrared detection and imaging.

Proceedings Article | 12 January 2009 Paper

Design and modal analysis of optical and mechanical structures of a space infrared camera

Guangyu Zhang, Dewei Sun, Funian Long

Proceedings Volume 7133, 713341 (2009) https://doi.org/10.1117/12.808472

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Space infrared cameras have been widely used for weather prediction, earth resource detection, military reconnaissance and astronomy observation. In order to design and produce an excellent space camera, the optical and mechanical structures of the camera are deeply investigated. Firstly, according to the technical targets and interface requirements for infrared sensor, optical modulation transfer function (MTF) must be up to 0.65 in the central field and more than 0.55 in the marginal field at the cut-off frequency of the optical system. Secondly, in accordance with the requirement of optical system, the structure of body tube is designed and a new type of material- graphite fiber reinforced aluminium matrix composite (Gr/Al composite) is used for the first time. The weight of Gr/Al composite body tube is 31.8% lighter than that of Titanium alloy. Thirdly, in terms of the theory of modal analysis, the resonance frequencies and modal sharps of body tube are acquired. The first order resonance frequency is 292Hz. Finally, the test of random vibration is conducted. Experimental results indicate that optical and mechanical systems do not change after vibration test. Namely, the research above suggests that space infrared camera has an important utility value in the space remote sensing field.

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