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实验力学国际会议

作者： Motoharu Fujigaki Yoshiharu Morimoto Faculty of Systems Engineering Wakayama University Sakaedani Wakayama 640-8510 Japan Faculty of Systems Engineering Wakayama University Sakaedani Wakayama 640-8510 Japan

＜正＞ Grating projection methods have been often used for non-contacting shape measurement. An image of equal-height contours of an object can be obtained in real-time using moire topography. We have developed the phase-shifting scanning moire method for real-time shape measurement with high resolution. But there is a problem that the measuring error becomes larger when the object is moving speedily because several images are captured while shifting the grating phase. In this paper, we propose a phase-shifting scanning moire method using a DMD （digital micro-mirror device）, which can obtain an image of equal-height contours within a frame time. The direction of a ray reflected at each mirror of a DMD can be selected quickly. For this purpose, we developed a DMD reflection-type CCD camera called as ’DMD camera’. The camera works as a camera whose each pixel has a shutter. The structure and an experimental result to confirm the algorithm to obtain a contour image using the DMD camera are shown.

关键词： digital micro-mirror device shape measurement phase-shifting scanning moire method moire topography

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Improving seeking precision by utilizing ghost imaging in a semi-active quadrant detection seeker

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Chinese Journal of Aeronautics 2021年第12期34卷 171-176页

作者： Siyuan WANG Lijing LI Wen CHEN Mingjie SUN Department of Opto-electronic Engineering Beihang UniversityBeijing 100083China

Conventional semi-active laser guidance takes advantage of the laser designator to illuminate the stable and uniform laser spot on target precisely.The seeker collects the reflected light by a quadrant detector and outputs the relative position information to guide the missile to the illuminating laser spot.However,the designation and guidance accuracy could be jeopardized by the randomly drifting of laser spot caused by the instability of designation platform and air turbulence.In this work,ghost imaging technique is adapted to a quadrant detector semi-active seeker by utilizing structured illumination on the target.With a series of structured illumination masks,the signals from the quadrant detector are multiplexed to perform calculation of the target relative position as well as image reconstruction of the illuminated area simultaneously.Automatic target recognition methods could be further applied to the reconstructed image to calculate the designating error and correct the guidance.The results of simulation and experiment demonstrate that the proposed method could improve the guidance accuracy in many circumstances which would lead to attacking deviation if conventional semi-active laser guidance is used.

关键词： digital micro-mirror device Ghost imaging Guidance system Image acquisition Semi-active laser seeker

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维普期刊数据库

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Dynamic full-color digital holographic 3D display on single DMD

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Opto-Electronic Advances 2021年第3期4卷 53-59页

作者： Chonglei Zhang Dongfang Zhang Zhouping Bian Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China

digital holography has high potentials for future 3D imaging and display technology.We present a method for a dynamic full-color digital holographic 3D display on single digital micro-mirror device(DMD)with full-color,high-speed and high-fidelity characteristics.We combine the square regions of adjacent micro-mirrors into super-pixels that can modulate amplitude and phase independently.Gray images are achieved by amplitude modulation and precise positioning of each color is achieved by phase modulation.The proposed method realizes a full-color imaging based on the three primary colors and achieves measured structural similarity of more than 88%and color similarity of more than 98%,while retaining the high switch speed of 9 kHz,thus achieving dynamic full-color 3D display on charge-coupled device(CCD).

关键词： 3D visualization digital holographic super-pixel digital micro-mirror device

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