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Related Experiment Video

Updated: May 6, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Displacement measurement using a wavelength-phase-shifting grating interferometer.

Ju-Yi Lee, Geng-An Jiang

    Optics Express
    |October 24, 2013
    PubMed
    Summary
    This summary is machine-generated.

    A new grating interferometer uses wavelength-modulated phase shifting for precise displacement measurements. This method achieves nanometer-level accuracy over large distances, enhancing optical metrology applications.

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    Area of Science:

    • Optics and Metrology
    • Interferometry
    • Nanotechnology

    Background:

    • Accurate displacement measurement is crucial in various scientific and industrial fields.
    • Traditional interferometry methods face limitations in range and precision.
    • Grating interferometry offers a robust platform for high-resolution measurements.

    Purpose of the Study:

    • To propose a novel grating interferometer system for displacement measurements.
    • To implement a wavelength-modulated phase-shifting technique for enhanced accuracy.
    • To validate the system's performance for both large-scale and nanoscale displacement detection.

    Main Methods:

    • Development of a grating interferometer utilizing a wavelength-modulated laser source.
    • Application of sequential phase shifting through an unequal-path-length optical configuration.
    • Employing time-domain quadrature detection to measure the optical phase of a moving grating.

    Main Results:

    • The proposed method successfully measures grating displacement using phase variation.
    • Experimental validation demonstrates detection of displacements up to 1 mm.
    • The system achieves displacement variation detection down to the nanometer range.

    Conclusions:

    • The wavelength-modulated phase-shifting grating interferometer is a viable technique for high-precision displacement sensing.
    • This method offers a significant advancement in optical metrology, enabling measurements over extended ranges with sub-nanometer resolution.
    • The developed system has potential applications in precision engineering, semiconductor manufacturing, and scientific instrumentation.