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    A novel non-contact method uses two autocollimators for precise external right-angle measurement. This technique achieves high accuracy, comparable to interferometers, for critical applications in precision engineering and spaceborne instrumentation.

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    Area of Science:

    • Optical Metrology
    • Precision Engineering
    • Interferometry

    Background:

    • Accurate external right-angle measurement is crucial for precision engineering.
    • Existing methods may have limitations in non-contact measurement scenarios.
    • Spaceborne laser interferometry requires high-precision angle measurements.

    Purpose of the Study:

    • To develop and validate a non-contact method for external right-angle measurement.
    • To establish a mathematical model for error evaluation and deduction.
    • To compare the method's accuracy against established interferometric techniques.

    Main Methods:

    • Utilized two autocollimators for non-contact angle measurement.
    • Developed a precise mathematical model to correct for measurement errors.
    • Validated results by comparison with a ZYGO interferometer.

    Main Results:

    • Achieved measurement accuracy superior to 0.1 arcsec for errors within 3.0 arcsec.
    • Extended accuracy to 0.4 arcsec for right-angle errors up to 8.0 arcsec.
    • Demonstrated high coincidence with ZYGO interferometer measurements.

    Conclusions:

    • The developed non-contact method provides high-accuracy external right-angle measurement.
    • The technique is suitable for applications requiring precise angle determination, such as in spaceborne laser interferometry.
    • This method offers a viable alternative for critical angle metrology.