Hyper-hemispheric and bifocal panoramic lenses

C. Pernechele

doi:10.1117/12.2028099

25 October 2013 Hyper-hemispheric and bifocal panoramic lenses

C. Pernechele

Proceedings Volume 8896, Electro-Optical and Infrared Systems: Technology and Applications X; 889603 (2013) https://doi.org/10.1117/12.2028099
Event: SPIE Security + Defence, 2013, Dresden, Germany

Abstract

Panoramic objectives are becoming, due to the availability of large area digital sensors, a diffuse optical system to catch very wide field of view (FoV). Typical panoramic lens have a view angle of 360° in azimuth (the plane orthogonal to the optical axis), just like a fish-eye, and plus and minus tens of degrees in elevation angle, i. e. above and below the horizon. Most common panoramic lenses use a curved, usually aspheric, mirror placed in front of a commercial objective to capture a 360° area around the horizon. More recent design use a catadiopter instead of a mirror. Both the solutions have the draw-back effect to obscure the frontal view of the objective, producing the classic "donut-shape" image in the focal plane. We present here a panoramic lens in which the frontal field is make available to be imaged in the focal plane, by means of a frontal optics, together with the panoramic field, producing a FoV of 360° in azimuth and 260° in elevation; it have then the capabilities of a fish eye plus those of a panoramic lens: we call it hyper-hemispheric lens. We design also a lens in which the frontal optics have a different paraxial focal length with respect to the equivalent panoramic; with this solution one can image, in the same sensor, the panoramic field plus an enlargement of a portion of it: that's the bifocal panoramic lens. Both the lenses have been designed and realized and we show here the optical scheme, the nominal performances and some pictures as an example.

Citation Download Citation

C. Pernechele "Hyper-hemispheric and bifocal panoramic lenses", Proc. SPIE 8896, Electro-Optical and Infrared Systems: Technology and Applications X, 889603 (25 October 2013); https://doi.org/10.1117/12.2028099

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