Volume 15 Issue 1
Jan.  2022
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SHAN Qiu-sha, XIE Mei-lin, LIU Zhao-hui, CHEN Rong-li, DUAN Jing, LIU Kai, JIANG Kai, ZHOU Liang, YAN Pei-pei. Design of cooled long-wavelength infrared imaging optical system[J]. Chinese Optics, 2022, 15(1): 72-78. doi: 10.37188/CO.2021-0116
Citation: SHAN Qiu-sha, XIE Mei-lin, LIU Zhao-hui, CHEN Rong-li, DUAN Jing, LIU Kai, JIANG Kai, ZHOU Liang, YAN Pei-pei. Design of cooled long-wavelength infrared imaging optical system[J]. Chinese Optics, 2022, 15(1): 72-78. doi: 10.37188/CO.2021-0116

Design of cooled long-wavelength infrared imaging optical system

doi: 10.37188/CO.2021-0116
Funds:  Supported by the National Natural Science Foundation of China (No. 61805275); CAS “Light of West China” Program (No. XAB2017B27)
More Information
  • Corresponding author: shqsh.2007@163.comlzh@opt.ac.cn
  • Received Date: 29 May 2021
  • Rev Recd Date: 16 Jun 2021
  • Available Online: 17 Aug 2021
  • Publish Date: 19 Jan 2022
  • Aiming at 640×512 long-wavelength infrared cooled detectors, a cooled long-wavelength infrared optical system was designed to track and detect an infrared target. The optical system adopts the secondary imaging structure to ensure 100% cold-shielding efficiency, and adopts a combination of optical material Ge and ZnS to achieve aberration correction and achromatic design. By introducing the high-order aspheric surface, the high aberration of the system is well-corrected, thus the system structure is simplified. The optical system is composed of 6 lenses. The focal length is 400 mm, the working bands are 7.7~9.3 μm, the field of view is 1.37°×1.10°, and the F-number is 2. The design results show that at a spatial frequency of 33 lp/mm, the MTF of off-axis field of view is more than 0.24, which approaches the diffraction limit and has high imaging quality. In the operating temperature range of −35~+55 ℃, the focusing lens is used to ensure the imaging quality under high and low temperature environments, which can be used for infrared tracking detection over a wide range of temperatures.

     

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