Mr. Zhenyu Jiang Profile

Zhenyu Jiang

at Beijing Institute of Technology

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Publications (2)

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Proceedings Article | 12 March 2008 Paper

Fisheye supplementary lens for liquid crystal projector

Zhenyu Jiang, Lin Li, Yifan Huang

Proceedings Volume 6624, 66241D (2008) https://doi.org/10.1117/12.791129

KEYWORDS: Projection systems, Wavefronts, Lens design, Liquid crystals, Chemical elements, Displays, Imaging systems, Objectives, Fluctuations and noise, Optoelectronics

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In some applications the large field-of-view projector is demanded for special purpose. However, currently available liquid-crystal-projectors generally have a field-of-view of 40 degree. These ordinary projectors can't meet the special requirements. The ordinary method for solving the problem is to remove the original projection lens and design a new fisheye lens whose field-of-view is large enough to meet the requirement. However, most current advanced projector's lenses are integrated with the circuit controllers or circuit boards. In many situations it is impossible to replace the lenses. In this paper, a new method, designing a new supplementary lens for the original projector without destroying its structure, is presented. The field-of-view of the new system can be expanded to 180 degree. Since the exit beam of the original projector lens is similar to parallel beam, the entrance beam of the supplementary lens is also parallel beam. That means, both the entrance and the exit beams of the supplementary lens are parallel beams. So the supplementary lens can be treated as a telephoto system. In this paper, the focal length of the original projector lens is 16.4 millimeter, the field-of-view is 42 degree, and the required field of view is 180 degree. The new designed supplementary lens is a reverse Galilean telephoto system. The software Zemax is used to design the system. Results show that the system is well designed and it can meet the actual requirements.

Proceedings Article | 28 November 2007 Paper

Design of a wide field of view infrared scene projector

Zhenyu Jiang, Lin Li, YiFan Huang

Proceedings Volume 6834, 68341R (2007) https://doi.org/10.1117/12.753643

KEYWORDS: Projection systems, Infrared imaging, Infrared radiation, Lenses, Servomechanisms, Fluctuations and noise, Optical spheres, Optical design, Scene simulation, Infrared lenses

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In order to make the projected scene cover the seeker's field-of-view promptly the conventional projection optical systems used for hardware-in-the-loop simulation test usually depend on the 5 axes flight-motion-simulator. Those flight-motion-simulator tables are controlled via servomechanisms. The servomechanism needs many axis position transducers and many electromechanical devices. The structure and controlling procedure of the system are complicated. It is hard to avoid the mechanical motion and controlling errors absolutely. The target image jitter will be induced by the vibration of mechanical platform, and the frequency response is limited by the structural performance. To overcome these defects a new infrared image simulating projection system for hardware-in-the-loop simulation test is presented in this paper. The system in this paper consists of multiple lenses joined side by side on a sphere surface. Each single lens uses one IR image generator or resistor array etc. Every IR image generator displays special IR image controlled by the scene simulation computer. The scene computer distributes to every IR image generator the needed image. So the scene detected by the missile seeker is integrated and uninterrupted. The entrance pupil of the seeker lies in the centre of the sphere. Almost semi-sphere range scene can be achieved by the projection system, and the total field of view can be extended by increasing the number of the lenses. However, the luminance uniformity in the field-of-view will be influenced by the joint between the lenses. The method of controlling the luminance uniformity of field-of-view is studied in this paper. The needed luminous exitance of each resist array is analyzed. The experiment shows that the new method is applicable for the hardware-in-the-loop simulation test.

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