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Wavelength scanning interferometry using multiple light sources.

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    |November 3, 2017
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    Summary
    This summary is machine-generated.

    A new method uses temporal phase unwrapping to improve depth resolution in wavelength scanning interferometry. This technique enhances distance measurement accuracy with multiple light sources, overcoming previous limitations.

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    Area of Science:

    • Optical metrology
    • Interferometry
    • Signal processing

    Background:

    • Wavelength scanning interferometry (WSI) is crucial for precise distance measurements.
    • Using multiple tunable light sources in WSI often degrades depth resolution due to phase ambiguity.
    • Existing methods struggle to maintain high resolution when extending the measurement range.

    Purpose of the Study:

    • To introduce a novel sensing method for WSI.
    • To address the depth resolution deterioration issue associated with multiple tunable light sources.
    • To enable accurate distance measurements over extended ranges using WSI.

    Main Methods:

    • Proposed a novel sensing method utilizing multiple tunable light sources.
    • Implemented a temporal phase unwrapping extrapolation technique.
    • Developed a method to unwrap phase differences across multiple phase intervals.

    Main Results:

    • Successfully regained depth resolution characteristics of a complete scan.
    • Demonstrated the ability to unwrap phase differences among multiple phase intervals.
    • Successfully identified intermediate phase values.

    Conclusions:

    • The proposed temporal phase unwrapping method effectively overcomes depth resolution limitations in WSI.
    • This technique allows for whole-scan phase sensing with reduced scanning intervals.
    • Achieved increased measurement speed and improved depth detection capabilities in WSI.