An infrared zoom imaging system with large zoom ratio based on linear motion mechanism
Author:
Affiliation:

1.Wang Zhijiang Laser Innovation Center, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;2.College of Material Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;3.Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

Clc Number:

TN216

Fund Project:

Supported by the National Pre-research Program during the 14th Five-Year Plan (514010405)

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    Abstract:

    In order to meet the urgent need of large-scale search and accurate target recognition, an infrared zoom imaging system with large zoom ratio is developed. Two independently moving zoom lenses and one compensating lens are designed, the large zoom ratio can be obtained by the cascade of two zoom lenses. According to the characteristics of multiple moving lenses and complex zoom curves, the zoom motion is realized by linear motion mechanism, and driven by linear motor integrated encoder and thread screw rod. The mechanical analysis of the system is carried out by the finite element simulation, and the maximum displacement of the lenses is 3.04×10-3 mm. The imaging system is suitable for the medium-wave infrared cooled 640×512 focal plane area-array detector, and the zoom ratio is 55. The results of laboratory imaging and outfield imaging show that the system has a clear and good imaging quality with a continuous change in focal length from 6 mm to 330 mm, which verifies the performance of the system. The design is reasonable and reliable. The research findings of this paper have broad application prospects in search, tracking, reconnaissance, and surveillance.

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ZHOU Pan-Wei, YU Yang, LI Fan-Ming, YE Xi-Sheng. An infrared zoom imaging system with large zoom ratio based on linear motion mechanism[J]. Journal of Infrared and Millimeter Waves,2023,42(6):843~850

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History
  • Received:February 10,2023
  • Revised:October 25,2023
  • Adopted:February 24,2023
  • Online: October 23,2023
  • Published: