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    Area of Science:

    • Optics and Photonics
    • Infrared Technology
    • Digital Imaging

    Background:

    • Digital micromirror device (DMD) projectors are used in the long-wave infrared (LWIR) band (8-12 μm).
    • Diffraction effects from the DMD significantly degrade imaging contrast in LWIR applications.
    • Existing projector systems require optimization to overcome these diffraction-induced limitations.

    Purpose of the Study:

    • To investigate and model the diffraction effects in DMD-based scene projectors operating in the long-wave infrared spectrum.
    • To develop a method for improving the imaging contrast of these LWIR projector systems.
    • To identify optimal operating conditions for enhanced contrast.

    Main Methods:

    • Application of a diffraction grating model for the DMD, based on scalar diffraction theory.
    • Utilizing Fourier transform principles within the modeling framework.
    • Conducting simulation calculations using MATLAB and verifying results through experimental validation.

    Main Results:

    • The study successfully modeled diffraction effects impacting DMD-based LWIR projectors.
    • Simulation and experimental results confirmed specific incident angles for optimal contrast.
    • Optimal contrast was observed at an incident azimuth angle of 0° and a zenith angle between 42° and 46°.

    Conclusions:

    • The proposed diffraction grating model effectively addresses contrast degradation in LWIR DMD projectors.
    • The findings provide a practical method to enhance imaging contrast for these systems.
    • Understanding and controlling diffraction is crucial for high-contrast LWIR projection.