• Infrared and Laser Engineering
  • Vol. 50, Issue 10, 20200454 (2021)
Mingze Qin, Yuan Hu, Wenjun He, Yang Zheng..., Yuhao Chu, Xiyao Yuan and Wenxuan Li|Show fewer author(s)
Author Affiliations
  • School of Opto-electronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
  • show less
    DOI: 10.3788/IRLA20200454 Cite this Article
    Mingze Qin, Yuan Hu, Wenjun He, Yang Zheng, Yuhao Chu, Xiyao Yuan, Wenxuan Li. Application of split-image mirror in defocus detection of laser rangefinder[J]. Infrared and Laser Engineering, 2021, 50(10): 20200454 Copy Citation Text show less
    Schematic diagram of split-image mirror imaging. (a) After the equal thickness; (b) Before the equal thickness line; (c) Above the equal thickness
    Fig. 1. Schematic diagram of split-image mirror imaging. (a) After the equal thickness; (b) Before the equal thickness line; (c) Above the equal thickness
    Defocus detection system light path diagram
    Fig. 2. Defocus detection system light path diagram
    [in Chinese]
    Fig. 3. [in Chinese]
    Schematic diagram of the relationship between the defocus detection accuracy and the apex angle of the split-image mirror, the ratio of the focal length of the tested system to the focal length of the detection system
    Fig. 3. Schematic diagram of the relationship between the defocus detection accuracy and the apex angle of the split-image mirror, the ratio of the focal length of the tested system to the focal length of the detection system
    System inspection diagram. (a) Installation drawing; (b) Sketch map
    Fig. 4. System inspection diagram. (a) Installation drawing; (b) Sketch map
    Defocus information displayed by computer. (a) Unfocused state; (b) Defocus state
    Fig. 5. Defocus information displayed by computer. (a) Unfocused state; (b) Defocus state
    Comparison curve of defocus measurement
    Fig. 6. Comparison curve of defocus measurement
    ACT/mmMEAMEA average/mm
    12345
    I10.9861.0050.9850.9951.0120.997
    II21.9712.0222.0241.9731.9921.996
    III32.9573.0243.0023.0412.9873.006
    44.0514.0333.9474.0463.9654.008
    55.0664.9295.0635.0204.9815.012
    65.9206.0805.9956.0516.0256.014
    Table 1. Measurement data
    Standard deviation/mmMaximum error/mmLimit error/mm
    I1.181×10−20.0151.373×10−2
    II2.564×10−20.0292.982×10−2
    III3.289×10−20.0433.824×10−2
    4.870×10−20.0515.663×10−2
    5.795×10−20.0716.738×10−2
    6.132×10−20.0807.131×10−2
    Table 2. Experimental analysis results
    Mingze Qin, Yuan Hu, Wenjun He, Yang Zheng, Yuhao Chu, Xiyao Yuan, Wenxuan Li. Application of split-image mirror in defocus detection of laser rangefinder[J]. Infrared and Laser Engineering, 2021, 50(10): 20200454
    Download Citation