Mr. Wubin Pang Profile

Wubin Pang

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Proceedings Article | 12 December 2018 Paper

Configurable cameras with MMS architecture

Wubin Pang, David Brady

Proceedings Volume 10845, 108450D (2018) https://doi.org/10.1117/12.2504750

KEYWORDS: Cameras, Imaging systems, Lens design, Spherical lenses, Objectives, Panoramic photography, Optics manufacturing, Computer architecture, Optical arrays, Channel projecting optics

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Monocentric multiscale (MMS) lens architecture provides a versatile, compact, high information efficiency and low-cost way of building panoramic imagers which can be easily tailored to various application scenarios. MMS lens consists of two parts, one concentric spherical objective lens with large aperture in front and an array of small aperture microcameras in rear. This front objective collects incoming light and forms a curved focal surface which is then being segmented and relayed by the secondary array optics. Since the front objective is a spherically symmetric element, the configuration of the secondary array optics determines the overall imaging space. Each microcamera can be used as a building block and offers the flexibility of compositing myriad of FoV coverage and easy re-configuration. Another merit of this modular design is that the design of the secondary optics can be varied from channel to channel. In this way, we can construct an imaging system with multi-focal lengths, multi-aperture sizes and other multi-specifications. This varied channel property allows for sub-region adaptive imaging ability. Finally, if multiple MMS lenses are co-designed and used jointly, some combinational functions can be accomplished. To verify these virtues of MMS architecture, we present several design examples in this paper. A rectangular and a 360-degree ring configuration are demonstrated and show different packing choices. Then we illustrate a multi-focal design which shows secondary optics of different channels are modified for a relatively uniform sampling rate of targeted area.

Proceedings Article | 31 December 2013 Paper

A novel optimization strategy for LED street lamp designing

Yun Dong, Zhaofeng Cen, Xiaotong Li, Wubin Pang, Wangchao Ruan

Proceedings Volume 9042, 904214 (2013) https://doi.org/10.1117/12.2037124

KEYWORDS: Light emitting diodes, Lamps, Light sources, LED lighting, Lens design, Optimization (mathematics), Roads, LED backlight, Light sources and illumination, Optical components

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In light-emitting diode (LED) street lamp design, it has always been an obsession that how to achieve an expected illumination distribution confined to a given region. To solve this problem, a new optimization strategy is proposed. In view of the practicability of actual production, we select the relatively mature approach that is based on both the Snell law and the energy conservation law which would obtain coordinate relations between the spaces the light source and target plane owned respectively and a set of equations to establish the initial construction of free-form lens. In addition, all the processes of simulation, analysis and optimization as well are accomplished in software. Generally speaking, for construction method which is in the light of the set of equations, the major improvement ideology focus on finding out the most suitable mapping relationship between the two coordinate systems. So does our work. In order to get better performance, the grid of control points must be modified. Then the core problem lies in determining the direction and distance of every point’s movement contained in the grid. The rule of changing direction has a bearing on energy relations while migration length is gained by direct search algorithm.We apply the method in uniform illumination and get some effect. In short, the optimization strategy provides a practical and simple way for street lamp design of LED illumination.

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