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Air refractive index measurement using low-coherence interferometry.

Tomáš Pikálek, Zdeněk Buchta

    Applied Optics
    |July 21, 2015
    PubMed
    Summary

    This study introduces a direct method for measuring the refractive index of air using combined interferometry techniques. The novel approach achieves high accuracy, demonstrating potential for precise environmental monitoring.

    Area of Science:

    • Optics and Photonics
    • Metrology
    • Environmental Sensing

    Background:

    • Accurate measurement of the refractive index of air is crucial for various scientific and industrial applications.
    • Traditional methods can be complex and time-consuming.
    • Advancements in interferometry offer new possibilities for direct and precise measurements.

    Purpose of the Study:

    • To develop and experimentally verify a direct method for measuring the refractive index of air.
    • To achieve high accuracy in refractive index measurements.
    • To compare the performance of the new method with established reference techniques.

    Main Methods:

    • Combining low-coherence interferometry and laser interferometry.
    • Utilizing a Michelson interferometer setup.

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  • Monitoring optical path length variations within a double-spaced glass cell to detect environmental changes.

    • Main Results:

    • Experimental verification of the theoretical analysis.
    • Demonstrated ability to measure the refractive index of air with an accuracy of 10-8.
    • Validation of the method through comparison with reference techniques.

    Conclusions:

    • The proposed direct method effectively measures the refractive index of air with high precision.
    • The combined interferometry approach offers a robust and accurate solution for air refractive index determination.
    • This technique has significant implications for precise environmental monitoring and optical metrology.