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The AFM Probe
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Area-coding method in frequency comb profilometry fused with optical interferometry for measuring centimeter-depth

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    This summary is machine-generated.

    Area coding masks enhance light intensity for frequency comb profilometry. This innovation enables precise measurement of practical metal objects, significantly increasing sampling points for detailed analysis.

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    Area of Science:

    • Optical Metrology
    • Imaging Systems
    • Nanotechnology

    Background:

    • Measuring practical metal objects with low reflectivity poses challenges for traditional profilometry.
    • High-frequency photodiodes in single-pixel imaging systems require concentrated light for optimal performance.
    • Existing random-coding masks are less efficient in concentrating light onto small photodetector areas.

    Purpose of the Study:

    • To introduce and evaluate area-coding masks for frequency comb profilometry (FCP).
    • To enhance the measurement accuracy of practical metal objects with weak reflections.
    • To improve light collection efficiency for high-frequency photodetectors in FCP systems.

    Main Methods:

    • Development and implementation of area-coding masks within a single-pixel imaging architecture FCP.
    • Comparison of light concentration efficiency between area-coding masks and commonly used random-coding masks.
    • Measurement of a practical metal object using the modified FCP system.

    Main Results:

    • Area-coding masks concentrate significantly more light onto the photodetector compared to random-coding masks.
    • The increased light intensity allows for a higher number of effective pixels in the FCP.
    • Accurate matching between optical interferometry data and FCP data was achieved.
    • Measurement of a practical metal object resulted in 16 times more sampling points.

    Conclusions:

    • Area-coding masks are effective in increasing detected light intensity for FCP.
    • This technique enables precise measurement of low-reflectivity practical metal objects.
    • The enhanced FCP system with area-coding masks offers superior data acquisition capabilities.