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Improvement of pointing accuracy for Risley prisms by parameter identification.

Jinying Li, Ke Chen, Qi Peng

    Applied Optics
    |October 20, 2017
    PubMed
    Summary

    This study enhances pointing accuracy for achromatic Risley prisms using a genetic algorithm to optimize physical parameters. The method significantly reduces pointing errors, improving system performance for high-accuracy applications.

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    Area of Science:

    • Optics and Photonics
    • Precision Engineering
    • Control Systems

    Background:

    • Achromatic Risley prisms offer potential for high-accuracy pointing and tracking.
    • Systematic errors in prism manufacturing, installation, and measurement limit current pointing accuracy.

    Purpose of the Study:

    • To improve the pointing accuracy of achromatic Risley prisms.
    • To develop a method for optimizing prism parameters to minimize systematic errors.

    Main Methods:

    • Established a mathematical model for Risley prisms, including forward and inverse solutions.
    • Proposed a genetic algorithm-based optimization method to identify physical model parameters (wedge angles, refractive indexes, installation).
    • Developed an experimental platform to validate the proposed method.

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    Main Results:

    • Optimized pointing accuracy improved significantly, reducing maximum pointing error from 33 arcsec to under 1 arcsec within a 3° deflection angle.
    • Achieved an angular dynamic range greater than 43 dB, meeting most application requirements.
    • Experimental validation confirmed the method's effectiveness in reducing errors and optimizing parameters.

    Conclusions:

    • The proposed optimization method effectively reduces the influence of manufacturing, installation, and measurement errors in achromatic Risley prisms.
    • The optimized system demonstrates significantly enhanced pointing accuracy and a wide angular dynamic range.
    • The study validates the practical applicability of the developed method for high-accuracy pointing and tracking systems.