Optics and Precision Engineering, Volume. 32, Issue 12, 1824(2024)

A large field of view infrared staring imaging system based on liquid crystal grating

Silin ZHAO1...2,3, Quanquan MU1,3,*, and Dayu LI13 |Show fewer author(s)
Author Affiliations
  • 1State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun30033, China
  • 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing10049, China
  • 3Key Laboratory of Optical System Advanced Manufacturing Technology, Chinese Academy of Sciences, Changchun100, China
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    Figures & Tables(22)
    Structure of the MWIR staring imaging system
    Telecentric beam path in image space
    MTF of each sub FOV unit
    Field lens array
    Figures of system vignetting
    Polarization independent LC shutter array
    Schematic diagram of liquid crystal devices in a liquid crystal shutter array
    Zemax simulation of a large FOV infrared staring imaging system based on liquid crystal grating, where different colors represent the light in different sub apertures
    Actual aperture light transmission diagram of the first surface of the rear lens group
    Rear lens group structure
    MTF of each FOV unit
    Distortion figures of each FOV unit
    Reverse tracing of Narcissus
    Tilted LC shutter array
    Reverse tracking after tilting the LC shutter array
    MTF of the center and left aperture tilting
    Image of NITD distribution on infrared detectors
    • Table 1. Design parameters of front lens group

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      Table 1. Design parameters of front lens group

      焦距f '入瞳直径D视场角2w
      206 mm40 mm10°
    • Table 2. Design parameters of relay lens group

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      Table 2. Design parameters of relay lens group

      场镜阵列焦距f1'准直透镜阵列焦距f2'
      54.7 mm55.9 mm
    • Table 3. Design parameters of LCPG

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      Table 3. Design parameters of LCPG

      液晶光栅的周期Λ液晶光栅的厚度d
      23 μm11.25 μm
    • Table 4. YNI and I/IBAR of each lens

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      Table 4. YNI and I/IBAR of each lens

      SurfYNII/IBAR
      S21-0.716 330.277
      S22-0.103 011.342
      S230.688 633.164
      S24-0.987 160.857
      S25-1.079 780.936
      S26-0.622 470.617
      S270.520 9913.318
      S28-0.444 850.924
    • Table 5. Relatively severe tolerance items in the system

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      Table 5. Relatively severe tolerance items in the system

      表面

      公差

      操作数

      设置值

      MTF(平均)

      改变

      S3TFRN±2 mm-0.043 918 48
      S5TFRN±2 mm-0.036 983 86
      S4TFRN±2 mm-0.032 480 42
      S2TFRN±2 mm-0.018 941 31
      S4,S6TTHI±0.05 mm-0.010 770 96
      S5TSTX±1.5′-0.009 821 52
      S7,S8TTHI±0.03 mm-0.008 647 26
      S5TSTY±1′-0.003 227 22
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    Silin ZHAO, Quanquan MU, Dayu LI. A large field of view infrared staring imaging system based on liquid crystal grating[J]. Optics and Precision Engineering, 2024, 32(12): 1824

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    Paper Information

    Category:

    Received: Feb. 28, 2024

    Accepted: --

    Published Online: Aug. 28, 2024

    The Author Email: MU Quanquan (muquanquan@ciomp.ac.cn)

    DOI:10.37188/OPE.20243212.1824

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