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Laser & Optoelectronics Progress, Volume. 58, Issue 14, 1412002(2021)

High Precision Positioning and Compensation Algorithm for Laser Spot Center

Jiawen Jiang, Jiehu Kang, and Bin Wu*
Author Affiliations
  • State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (10)
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    References (19)
    Cited By (7)
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    Figures & Tables(10)
    Relationship between residual Δyk and center position yc

    Fig. 1. Relationship between residual Δyk and center position yc

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    Relationship between residual Δyk and center position yc after error compensation

    Fig. 2. Relationship between residual Δyk and center position yc after error compensation

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    Experimental setup for verifying the localization algorithm

    Fig. 3. Experimental setup for verifying the localization algorithm

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    Laser spot image

    Fig. 4. Laser spot image

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    Measured relationship between residual Δyk and center position yc

    Fig. 5. Measured relationship between residual Δyk and center position yc

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    Error compensation curve

    Fig. 6. Error compensation curve

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    Spot center coordinates in y direction

    Fig. 7. Spot center coordinates in y direction

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    • Table 1. Result of error compensation unit: pixel

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      Table 1. Result of error compensation unit: pixel

      No.Realvalue ycCoordinate yd beforecompensationresidual Δyk beforecompensationCoordinate yr aftercompensationresidual Δyk aftercompensation
      1805.364805.242-0.122805.335-0.030
      2805.562805.6960.134805.6100.048
      3805.759805.8380.079805.753-0.006
      4805.956805.954-0.002805.9590.003
      5806.153806.034-0.120906.129-0.024
      6806.351806.304-0.047806.3860.036
      7806.745806.8180.073806.741-0.004
      8906.942806.919-0.023806.929-0.013
      9807.140807.047-0.092806.1500.010
      10807.534807.6580.124808.5550.021

    • Table 2. Repeatability analysis of positioning algorithms unit: pixel

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      Table 2. Repeatability analysis of positioning algorithms unit: pixel

      AlgorithmResidualStandard deviation
      Centroid0.1470.059
      Gray centroid1.4700.482
      Gaussian fitting0.2200.070
      Ellipse fitting0.3180.123
      Compensated centroid0.0700.006

    • Table 3. Straightness analysis of positioning algorithm

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      Table 3. Straightness analysis of positioning algorithm

      AlgorithmStraightness/pixel
      Centroid0.25
      Gray centroid1.47
      Gaussian fitting0.23
      Ellipse fitting0.25
      Compensated centroid0.12
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    Jiawen Jiang, Jiehu Kang, Bin Wu. High Precision Positioning and Compensation Algorithm for Laser Spot Center[J]. Laser & Optoelectronics Progress, 2021, 58(14): 1412002

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    Paper Information

    Category: Instrumentation, Measurement and Metrology

    Received: Oct. 10, 2020

    Accepted: Nov. 12, 2020

    Published Online: Jul. 6, 2021

    The Author Email: Bin Wu (wubin@tju.edu.cn)

    DOI:10.3788/LOP202158.1412002

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology