Multi-spectral panoramic annular lens

James B. Johnson; Joshua Brown

doi:10.1117/12.2618003

27 May 2022 Multi-spectral panoramic annular lens

James B. Johnson, Joshua Brown

Proceedings Volume 12103, Advanced Optics for Imaging Applications: UV through LWIR VII; 1210302 (2022) https://doi.org/10.1117/12.2618003
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

The Panoramic Annular Lens (PAL) form provides a hyper-hemispheric field of view in a monolithic element. The lens uses two refractive and two or more internally reflective surfaces to create an afocal or near-afocal imaging system. The resulting field of view loses some coverage off of the central axis due to obscurations from the multiple surfaces, resulting in a doughnut-like image. The PAL form provides significant size and complexity advantages over fish-eye and other wide-angle lenses, as multiple individual elements are combined into the single block monolith. The design form also provides ideal locations for mounting and blocking based on the intersection of the various curves into the surface. Up to this point, PAL designs have been limited to small spectral regions based on the substrate material. We developed several visible through long-wave variants of this form in a variety of multiple multi-spectral materials, each providing an annular coverage from 30-110° off of the central axis. Results are shown from a fabricated prototype in water-clear Zinc Sulfide, including imaging tests in the visible and LWIR.

Conference Presentation

Citation Download Citation

James B. Johnson and Joshua Brown "Multi-spectral panoramic annular lens", Proc. SPIE 12103, Advanced Optics for Imaging Applications: UV through LWIR VII, 1210302 (27 May 2022); https://doi.org/10.1117/12.2618003

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