Dynamically tunable hemispherical electronic eye camera system with adjustable zoom capability
Dynamically tunable hemispherical electronic eye camera system with adjustable zoom capability
复制标题
具有可调变焦能力的动态可调半球电子眼摄像系统
DOI：
10.1073/pnas.1015440108
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发表时间：
2011-02-01
影响因子：
11.1
通讯作者：
Rogers, John A.
中科院分区：
文献类型：
--
作者：
Jung, Inhwa;Xiao, Jianliang;Rogers, John A.
利用曲线布局的光电探测器阵列的成像系统由于其匹配强非平面图像表面（即，Petzval表面），这些表面由简单的透镜形成，从而创造了新的设计选择。最近的工作在实现这种“眼球”相机方面取得了重大进展，包括能够收集逼真图像的全功能硅器件的例子。尽管与传统平面设计的系统相比，这些系统具有优势，但它们的固定探测器曲率使它们与Petzval表面的变化不兼容，而Petzval表面的变化伴随着简单镜头实现的可变变焦。本文介绍了一类数字成像设备，克服了这一限制，通过使用薄弹性膜上的光电探测器阵列，能够可逆变形成半球形的曲率半径，可以动态调整，通过液压。将这种类型的检测器与类似可调的流体平凸透镜相结合，产生具有可变变焦和优异成像特性的半球形相机。对机械和光学的系统实验和理论研究揭示了所有基本的操作原理。这种技术可用于夜视监视、内窥镜成像和其他需要具有简单变焦光学器件和广角视野的紧凑型相机的领域。
Imaging systems that exploit arrays of photodetectors in curvilinear layouts are attractive due to their ability to match the strongly nonplanar image surfaces (i.e., Petzval surfaces) that form with simple lenses, thereby creating new design options. Recent work has yielded significant progress in the realization of such “eyeball” cameras, including examples of fully functional silicon devices capable of collecting realistic images. Although these systems provide advantages compared to those with conventional, planar designs, their fixed detector curvature renders them incompatible with changes in the Petzval surface that accompany variable zoom achieved with simple lenses. This paper describes a class of digital imaging device that overcomes this limitation, through the use of photodetector arrays on thin elastomeric membranes, capable of reversible deformation into hemispherical shapes with radii of curvature that can be adjusted dynamically, via hydraulics. Combining this type of detector with a similarly tunable, fluidic plano-convex lens yields a hemispherical camera with variable zoom and excellent imaging characteristics. Systematic experimental and theoretical studies of the mechanics and optics reveal all underlying principles of operation. This type of technology could be useful for night-vision surveillance, endoscopic imaging, and other areas that require compact cameras with simple zoom optics and wide-angle fields of view.