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Frame frequency prediction for Risley-prism-based imaging laser radar.

Yafei Lu, Yuan Zhou, Mo Hei

    Applied Optics
    |June 13, 2014
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    Summary
    This summary is machine-generated.

    Dual-wedge scanners enable fast, blind-region-free laser imaging radar. Controlling wedge rotation rates optimizes scanning patterns and boosts frame rates for efficient imaging.

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    Area of Science:

    • Optics and Photonics
    • Laser Systems
    • Imaging Technology

    Background:

    • Dual-wedge scanners offer potential for advanced laser imaging radar systems.
    • Achieving fast, seamless scanning without blind regions requires precise control of wedge rotation.

    Purpose of the Study:

    • To investigate 2D scan patterns and path density using a first-order paraxial approximation.
    • To analyze the impact of wedge angular frequency ratios on scanning behavior.
    • To estimate the frame rate for no-blind-region scanning imaging.

    Main Methods:

    • Employing the first-order paraxial approximation method.
    • Analyzing scanning patterns for wedges rotating in same and opposite directions.
    • Estimating frame rate based on imaging coverage requirements.

    Main Results:

    • Co-rotating wedges produce a spiral scan dense at the center and sparse at the edge.
    • Counter-rotating wedges generate a rosette scan with opposite density distribution.
    • Higher wedge rotation rates and wider instantaneous fields of view (IFOV) increase frame rate.

    Conclusions:

    • Scan pattern density is inversely related to the scan period.
    • No-blind-region scanning imaging frame rates up to 18-20 fps are achievable with specific parameters.
    • Optimized wedge rotation control is crucial for high-performance laser imaging radar.