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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...

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High-precision liquid reference Fizeau interferometry with motionless phase-shifting method and tilt-suppressed

Nianfeng Wang, Zhiyao Ma, Shengxi Wang

    Optics Express
    |December 19, 2025
    PubMed
    Summary

    This study introduces a high-precision Fizeau interferometry system using a liquid reference. The novel method significantly improves measurement accuracy by suppressing tilt errors, enhancing surface shape analysis.

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    Area of Science:

    • Optical Metrology
    • Precision Engineering

    Background:

    • Traditional Fizeau interferometry faces challenges with surface flatness assumptions and environmental disturbances.
    • Liquid surfaces can be affected by factors like edge infiltration, altering their shape over time.

    Purpose of the Study:

    • To develop a high-precision Fizeau interferometry system utilizing a liquid reference for enhanced measurement accuracy.
    • To investigate methods for suppressing tilt errors in interferometric measurements.

    Main Methods:

    • A motionless temporal polarization phase-shifting method with a liquid crystal variable retarder for stable phase shifting.
    • Utilizing 100cSt dimethyl silicone oil as a liquid reference in the interference module.
    • Employing the conjugate differential method for orthogonal translation and surface shape acquisition of the liquid reference.

    Main Results:

    • The liquid reference movement suppresses tilt errors from motorized stage guidance, leveraging liquid properties and gravity.
    • Environmental vibrations, mechanical movement, and drift-induced tilt errors are mitigated through averaging and high-precision measurement constraints.
    • Experimental results demonstrate a 1.07 nm improvement in the standard deviation of residual vertical diameter lines after calibration.

    Conclusions:

    • The developed liquid reference Fizeau interferometry system offers superior precision and stability.
    • The conjugate differential method effectively addresses liquid surface shape deviations and suppresses tilt errors.
    • This approach significantly enhances the accuracy of optical surface metrology.