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Proceedings Paper

Modulate chopper technique used in pyroelectric uncooled focal plany array thermal imager
Author(s): Yuqing He; Weiqi Jin; Guangrong Liu; Zhiyun Gao; Xia Wang; Lingxue Wang
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Paper Abstract

Pyroelectric uncooled focal plane array (FPA) thermal imager has the advantages of low cost, small size, high responsibility and can work under room temperature, so it has great progress in recent years. As a matched technique, the modulate chopper has become one of the key techniques in uncooled FPA thermal imaging system. Now the Archimedes spiral cord chopper technique is mostly used. When it works, the chopper pushing scans the detector's pixel array, thus makes the pixels being exposed continuously. This paper simulates the shape of this kind of chopper, analyses the exposure time of the detector's every pixel, and also analyses the whole detector pixels' exposure sequence. From the analysis we can get the results: the parameter of Archimedes spiral cord, the detector's thermal time constant, the detector's geometrical dimension, the relative position of the detector to the chopper's spiral cord are the system's important parameters, they will affect the chopper's exposure efficiency and uniformity. We should design the chopper's relevant parameter according to the practical request to achieve the chopper's appropriate structure.

Paper Details

Date Published: 20 September 2002
PDF: 6 pages
Proc. SPIE 4919, Advanced Materials and Devices for Sensing and Imaging, (20 September 2002); doi: 10.1117/12.471869
Show Author Affiliations
Yuqing He, Beijing Institute of Technology (China)
Weiqi Jin, Beijing Institute of Technology (China)
Guangrong Liu, Beijing Institute of Technology (China)
Zhiyun Gao, Beijing Institute of Technology (China)
Xia Wang, Beijing Institute of Technology (China)
Lingxue Wang, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 4919:
Advanced Materials and Devices for Sensing and Imaging
Jianquan Yao; Yukihiro Ishii, Editor(s)

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