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Non-blind area PAL system design based on dichroic filter.

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    This study introduces a novel Panoramic Annular Lens (PAL) system design using a dichroic filter to eliminate the central blind area. This innovation enhances detector pixel efficiency by imaging ultraviolet and visible light onto the same detector.

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    Area of Science:

    • Optics and Photonics
    • Imaging Systems
    • Optical Engineering

    Background:

    • Panoramic Annular Lens (PAL) systems suffer from a central blind area, reducing detector pixel efficiency.
    • This limitation hinders the comprehensive data acquisition capabilities of PAL imaging.

    Purpose of the Study:

    • To design an improved PAL system that overcomes the central blind area limitation.
    • To enhance detector pixel efficiency by utilizing the entire image plane for imaging.

    Main Methods:

    • A dichroic filter was integrated into the PAL system design.
    • The dichroic filter was engineered to reflect ultraviolet (UV) rays and transmit visible rays.
    • A correcting lens group was added to image both UV and visible light bands onto the same detector plane.

    Main Results:

    • The novel PAL system successfully images UV rays within the 30°–90° field of view (FOV) onto the conventional PAL imaging area.
    • Visible rays are imaged within the 0°–10° FOV onto the previously blind central area of the image plane.
    • The integration of the dichroic filter and correcting lens effectively eliminates the central blind spot, improving overall system performance.

    Conclusions:

    • The proposed dichroic filter-based PAL system design effectively addresses the central blind area problem.
    • This design significantly enhances detector pixel efficiency by enabling dual-band imaging.
    • The system offers a promising solution for advanced imaging applications requiring wide and narrow field-of-view data acquisition simultaneously.