Infrared and Laser Engineering, Volume. 51, Issue 7, 20210808(2022)

Design of a 3D zoom exoscope optical system with a long working distance

Zhongyu Cao and Yang Xiang
Author Affiliations
  • School of Opto-Electronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
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    Figures & Tables(17)
    Imaging principle of 3D exoscope optical system
    Schematic of 3D exoscope optical system with single optical path
    Structure of Gaussian optical system in front zoom group
    Structure of Gaussian optical system in rear zoom group
    Optical system structure of front zoom group
    Optical system structure of rear zoom group
    Optical system structure
    MTF curves
    [in Chinese]
    [in Chinese]
    Field curvature and distortion
    Cam curves
    • Table 1. System design parameters

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      Table 1. System design parameters

      ParameterValue
      Working distance/mm180-380
      Object space NA0.011-0.052
      Wavelength/μm0.486-0.656
      Magnification1/1.36×-1/6.36×
      Object height/mm2y=15-70
      Total length/mm≤350
      MTF105 lp/mm≥0.2
    • Table 2. Front zoom system design parameters

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      Table 2. Front zoom system design parameters

      ParameterValue
      Back focal length/mm180-380
      Image space F# 9.5-44
      Wavelength/μm0.486-0.656
      Front zoom system focal length/mm200-400
      Image height/mm2y'=15-70
      Object field of view/(°)4.3-10
    • Table 3. Rear zoom system design parameters

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      Table 3. Rear zoom system design parameters

      ParameterValue
      Image space F# 7
      Wavelength/μm0.486-0.656
      Rear zoom system focal length/mm63-147
      Image height/mm2y'=11
      Object field of view/(°)4.3-10
      Back focal length/mm≥15
    • Table 4. Every configuration tolerance analysis MTF value

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      Table 4. Every configuration tolerance analysis MTF value

      The demagnification 1/β=6.36× The demagnification 1/β=5.36× The demagnification 1/β=4.36×
      ProbabilityMTFProbabilityMTFProbabilityMTF
      90%0.3114830690%0.2964892390%0.28218524
      80%0.3114830680%0.3171669180%0.29807905
      50%0.3504690550%0.3512162850%0.32811532
      20%0.3689141020%0.3711961820%0.35217057
      10%0.3760412610%0.3826671110%0.36348125
      The demagnification 1/β=3.36× The demagnification 1/β=2.36× The demagnification 1/β=1.36×
      ProbabilityMTFProbabilityMTFProbabilityMTF
      90%0.2647365090%0.2009613590%0.15835870
      80%0.2908855480%0.2337362280%0.17720559
      50%0.3374854050%0.3005224650%0.22655441
      20%0.3645778620%0.3342426320%0.25626545
      10%0.3700159310%0.3486103510%0.26739952
    • Table 5. Distance of the moving group from image versus the demagnification

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      Table 5. Distance of the moving group from image versus the demagnification

      The demagnification 1/β1.36×2.36×3.36×4.36×5.36×6.36×
      Distance of the second group from image/mm251.16247.32242.76237.45229.69219.11
      Distance of the fifth group from image/mm160.90158.76155.44151.31146.52135.74
      Distance of the sixth group from image/mm104.35104.62105.21107.96113.99120.79
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    Zhongyu Cao, Yang Xiang. Design of a 3D zoom exoscope optical system with a long working distance[J]. Infrared and Laser Engineering, 2022, 51(7): 20210808

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    Paper Information

    Category: Optical design

    Received: Nov. 1, 2021

    Accepted: --

    Published Online: Dec. 20, 2022

    The Author Email:

    DOI:10.3788/IRLA20210808

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