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Improving Angular Accuracy of a Scanning Mirror Based on Error Modeling and Correction.

Yue Fan1, Wenli Ma2, Ping Jiang3

  • 1Institute of Optics and Electronics, Chinese Academy of Sciences, 610209 Chengdu, China. fanyue_1984@163.com.

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Summary
This summary is machine-generated.

This study introduces an angular error-correction method to enhance scanning mirror accuracy in optoelectronic systems. The developed model significantly improves line-of-sight stabilization by reducing sensor errors.

Keywords:
angle calibrationangular accuracyeddy current displacement sensorerror modelmodel correctionscanning mirror

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Area of Science:

  • Optoelectronics
  • Mechanical Engineering
  • Control Systems

Background:

  • Scanning mirrors are crucial for line-of-sight (LOS) stabilization in optoelectronic systems.
  • Eddy current displacement sensors are used for measuring scanning mirror angles but suffer from inaccuracies.
  • Existing methods lack sufficient precision for high-accuracy LOS stabilization.

Purpose of the Study:

  • To propose and demonstrate an angular error-correction method for scanning mirrors using eddy current displacement sensors.
  • To develop a mathematical model for predicting and correcting angular errors.
  • To improve the overall angular accuracy and robustness of scanning mirror systems.

Main Methods:

  • Development of a mathematical angular error model incorporating physical parameters.
  • Application of the cross-validation method to determine the optimal order of the Maclaurin series for the error model.
  • Identification of error parameters through fitting calibrated angular errors with the developed model.
  • Establishment of a closed-loop control system based on the corrected angular calculation model.

Main Results:

  • The angular error-correction method demonstrated excellent error prediction performance.
  • The closed-loop control system achieved highly accurate deflection angles within ±1.5 degrees.
  • Angular accuracy was improved from 0.28 degrees to under 1.1 arcseconds.
  • The standard deviation for multiple measurements was consistently below 1.2 arcseconds.

Conclusions:

  • The proposed angle correction method effectively enhances the linearity of eddy current sensors.
  • The method significantly reduces the impact of manufacturing and installation errors on scanning mirror accuracy.
  • This technique offers a robust solution for achieving high-precision line-of-sight stabilization in optoelectronic applications.