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    Area of Science:

    • Fluid Dynamics
    • Optical Metrology
    • Laser-Based Measurement

    Background:

    • Focused Laser Differential Interferometry (FLDI) is a powerful technique for non-intrusive flow measurement.
    • Traditional FLDI setups are primarily suited for analyzing two-dimensional flows.
    • There is a need for advanced techniques to capture complex three-dimensional flow dynamics.

    Purpose of the Study:

    • To modify FLDI for enhanced three-dimensional flow analysis.
    • To investigate the use of dual-wavelengths in FLDI to achieve spatial separation of measurement points.
    • To validate the modified FLDI system's performance in complex flow scenarios.

    Main Methods:

    • Implementation of a dual-wavelength interferometer within the FLDI setup.
    • Accounting for chromatic aberration of optical components through modified ray trace calculations.
    • Experimental validation using a tube jet and a laser-induced blast wave.

    Main Results:

    • Demonstration of adjacent beam pairs distributed along the optical axis using two different wavelengths.
    • Successful prediction of focal points for each wavelength via modified ray tracing.
    • Experimental results confirm the modified FLDI retains core velocimetry capabilities.

    Conclusions:

    • The modified FLDI system successfully enables analysis of three-dimensional flows.
    • This dual-wavelength approach expands FLDI's applicability, particularly for high-frequency flow content.
    • Integration with multi-point variations offers further potential for advanced fluid dynamics research.