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Improved active-tracking performance through Hadamard speckle contrast reduction.

Emory L Jenkins, Derek J Burrell

    Optics Letters
    |November 1, 2023
    PubMed
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    Hadamard speckle contrast reduction (HSCR) minimizes centroiding error in active tracking and wavefront sensing by projecting multiple phase patterns. Performance scales with the number of patterns, showing promise for enhanced imaging applications.

    Area of Science:

    • Optics and Photonics
    • Image Processing
    • Metrology

    Background:

    • Speckle imaging is susceptible to centroiding errors.
    • Active imaging techniques are crucial for tracking and wavefront sensing.
    • Hadamard speckle contrast reduction (HSCR) is known for improving coherent image quality.

    Purpose of the Study:

    • To investigate the efficacy of HSCR in reducing centroiding error for active tracking.
    • To evaluate the performance scaling of HSCR with increasing phase pattern realizations.
    • To explore the application of HSCR beyond coherent image quality enhancement.

    Main Methods:

    • Wave-optics simulations were conducted to model the HSCR technique.
    • Benchtop experiments were performed to validate simulation findings.

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  • Multiple orthogonal phase patterns were projected onto an actively imaged object within a single camera resolution cell and integration time.
  • Centroiding error was measured as a function of the number of phase patterns applied.

    • Main Results:

    • HSCR significantly reduced centroiding error in simulations and experiments.
    • Observed performance improvement was proportional to the square root of the number of phase patterns, aligning with theoretical expectations.
    • Experimental results showed good agreement with simulations, especially for smaller object sizes.
    • The benefits of HSCR were demonstrated to extend to active tracking and wavefront sensing.

    Conclusions:

    • HSCR is an effective method for reducing centroiding error in active imaging systems.
    • The technique offers a scalable approach to enhance tracking and wavefront sensing accuracy.
    • HSCR provides a valuable tool for improving the performance of optical measurement systems.