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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Laser reflection differential confocal large-radius measurement.

Weiqian Zhao, Xin Zhang, Yun Wang

    Applied Optics
    |November 13, 2015
    PubMed
    Summary
    This summary is machine-generated.

    A novel laser reflection differential confocal large-radius measurement (RDCLRM) method precisely measures large radius of curvature. This technique achieves high accuracy with a shorter measurement path, offering a relative expanded uncertainty better than 0.005%.

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    Area of Science:

    • Optics and Optical Metrology
    • Precision Engineering
    • Surface Metrology

    Background:

    • Accurate measurement of large radius of curvature (ROC) is critical in optical manufacturing.
    • Existing methods often face limitations in precision, efficiency, or measurement path length for large ROCs.
    • High-precision metrology is essential for advanced optical systems.

    Purpose of the Study:

    • To introduce a new method, laser reflection differential confocal large-radius measurement (RDCLRM), for high-precision measurement of large ROC.
    • To enable efficient and accurate measurement of large ROC using a reduced optical path.
    • To validate the performance and uncertainty of the proposed RDCLRM technique.

    Main Methods:

    • Utilizing differential confocal focusing technology to identify the converging point of a multiply reflected test beam.
    • Measuring the distance between test lens positions corresponding to converging points from different reflection times.
    • Implementing a laser reflection-based approach for enhanced signal detection and analysis.

    Main Results:

    • The RDCLRM method successfully measures large ROC with high precision and efficiency.
    • A shorter measurement lightpath is achieved compared to conventional techniques.
    • Preliminary experimental results demonstrate a relative expanded uncertainty of better than 0.005% (k=2).

    Conclusions:

    • The RDCLRM method provides a precise and efficient solution for large ROC metrology.
    • The technique offers significant advantages in terms of measurement accuracy and reduced lightpath.
    • RDCLRM is a promising approach for high-precision optical component characterization.