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Updated: Dec 3, 2025

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Benchmarking background oriented schlieren against interferometric measurement using open source tools.

D Kaganovich, L A Johnson, A A Mamonau

    Applied Optics
    |October 26, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Synchronized background oriented schlieren and interferometry measured gas flow from an under-expanding jet. Density distributions derived from schlieren matched interferometry data using Python recipes.

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    Area of Science:

    • Fluid dynamics
    • Optical diagnostics

    Background:

    • Under-expanded jets are crucial in various aerospace and industrial applications.
    • Accurate measurement of gas density distribution is essential for understanding jet behavior.

    Purpose of the Study:

    • To measure gas flow from an under-expanding jet nozzle.
    • To compare density distributions obtained from two different optical diagnostic techniques.

    Main Methods:

    • Utilized synchronized background oriented schlieren (BOS) and interferometry.
    • Obtained gas density distribution from BOS shift vector fields.
    • Employed a simple calibration routine and open-source Python recipes for data comparison.

    Main Results:

    • Successfully obtained gas density distribution using BOS.
    • Demonstrated good agreement between density distributions from BOS and interferometry.
    • Validated the effectiveness of the combined diagnostic approach.

    Conclusions:

    • Synchronized BOS and interferometry provide a robust method for measuring gas density in under-expanded jets.
    • Open-source Python tools facilitate efficient data processing and comparison.
    • The study validates a cost-effective approach for flow diagnostics.