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High-speed phase-shifting interferometry using triangular prism for time-resolved temperature measurement.

Eita Shoji, Atsuki Komiya, Junnosuke Okajima

    Applied Optics
    |July 21, 2015
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    Summary

    A novel high-speed phase-shifting interferometer utilizing an original optical prism enables quantitative visualization of transient heat transfer. This system achieves high spatial resolution and temporal speeds, validated by measuring temperature around a heated wire.

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    Area of Science:

    • Optical Engineering
    • Heat Transfer
    • Fluid Dynamics

    Background:

    • High-speed phenomena visualization requires advanced optical techniques.
    • Phase-shifting interferometry is crucial for quantitative measurements.
    • Transient heat transfer analysis demands high temporal and spatial resolution.

    Purpose of the Study:

    • To propose and validate a high-speed phase-shifting interferometer for transient heat transfer visualization.
    • To introduce an original optical prism designed for high-speed phase-shifting applications.
    • To demonstrate the system's capability in measuring temperature fields around a heated micro-wire.

    Main Methods:

    • Development of a phase-shifting interferometer using a polarizing Mach-Zehnder interferometer and an original arbaa prism.
    • Implementation of a three-step phase-shifting technique with a high-speed camera (300,000 fps).
    • Quantitative temperature field determination using the inverse Abel transform of phase-shifted data.

    Main Results:

    • Successful quantitative visualization of transient heat transfer around a 5 μm tungsten wire in water.
    • Achieved spatial resolution of 3.5 μm and temporal resolution of 300,000 fps.
    • Experimental temperature distribution showed good agreement with numerical calculations.

    Conclusions:

    • The proposed high-speed phase-shifting interferometer with an original optical prism is effective for quantitative transient heat transfer analysis.
    • The system demonstrates high performance in terms of speed and resolution for micro-scale phenomena.
    • Validation against numerical results confirms the system's accuracy and reliability.