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    Measuring the modulation transfer function (MTF) of small pixels in microbolometer focal plane arrays (FPAs) is challenging. An improved interferometric method effectively assesses MTF for miniaturized optical systems.

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    Area of Science:

    • Optical engineering
    • Microbolometer technology
    • Image sensor characterization

    Background:

    • Miniaturized optical systems face Size, Weight, Power, and Cost (SWAP-C) challenges.
    • Decreasing pixel pitch in focal plane arrays (FPAs) is crucial for miniaturization.
    • Measuring Modulation Transfer Function (MTF) for small pixels presents high cut-off frequency challenges.

    Purpose of the Study:

    • To adapt and apply an improved interferometric method for MTF measurement in microbolometer FPAs.
    • To assess the performance of FPAs with varying small pixel pitches (17, 12, and 8.5 µm).
    • To extract key technological parameters of microbolometer pixels.

    Main Methods:

    • Utilized an enhanced interferometric method based on Lloyd's mirror setup.
    • Applied improved test bench and image processing techniques.
    • Fitted experimental results with an analytical model.

    Main Results:

    • Successfully measured MTF for microbolometer FPAs with 17, 12, and 8.5 µm pixel pitches.
    • Experimental data provided insights into pixel size and cross-talk.
    • The method demonstrated effectiveness for high spatial frequencies.

    Conclusions:

    • The improved interferometric technique is suitable for characterizing small-pixel microbolometer FPAs.
    • Accurate MTF measurement is vital for assessing miniaturized optical system quality.
    • The method facilitates the deduction of critical pixel technological parameters.