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Long-range frequency domain low-coherence interferometry detector for industrial applications.

Santiago Cerrotta, Jorge R Torga, Eneas N Morel

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |May 3, 2023
    PubMed
    Summary

    A novel time Fourier domain low-coherence interferometry (LCI) detector offers low-cost, long-range thickness measurements with micrometer resolution. This innovative technique accurately measures diverse materials, including industrial products, without optical path limitations.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Materials Science

    Background:

    • Low-coherence interferometry (LCI) is crucial for non-contact metrology.
    • Traditional LCI methods can face limitations in range and cost.
    • Advancements are needed for precise thickness measurements of various materials.

    Purpose of the Study:

    • To introduce a low-cost, long-range frequency domain low-coherence interferometry (LCI) detector.
    • To demonstrate the capabilities of the time Fourier domain LCI (TFD-LCI) technique.
    • To evaluate the accuracy and repeatability of TFD-LCI for diverse applications.

    Main Methods:

    • Developed a time Fourier domain LCI (TFD-LCI) system.
    • Combined time and frequency domain LCI principles.
    • Performed mathematical analysis, simulations, and experimental validation.
    • Measured thicknesses of monolayer and multilayer samples, including industrial products.

    Main Results:

    • The TFD-LCI detector achieves micrometer resolution over several centimeters.
    • No limitation on the maximum optical path was observed.
    • High repeatability and accuracy were demonstrated.
    • Successful characterization of transparent packages and glass windshields.

    Conclusions:

    • TFD-LCI presents a cost-effective solution for long-range, high-resolution thickness measurements.
    • The technique is versatile, applicable to both small and large samples.
    • TFD-LCI shows significant potential for industrial inspection and quality control.