The modulate chopper technique used in pyroelectric uncooled focal plane array thermal imager

Yuqing He*, Weiqi Jin, Guangrong Liu, Zhiyun Gao, Xia Wang, Lingxue Wang

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

26 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)283-288
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4919
DOIs
Publication statusPublished - 2002
EventAdvanced Materials and Devices for Sensing and Imaging - Shanghai, China
Duration: 17 Oct 200218 Oct 2002

Keywords

  • Archimedes spiral cord
  • FPA detector
  • Modulate chopper
  • Pyroelectric

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