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三维小视场成像系统

3D small-field imaging system

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摘要

研究了一套投影正弦光栅条纹,测量表面有大梯度或非连续结构等复杂形貌微小物体的三维测量系统。针对所测量物体大小,通过将体视显微镜、相机和投影仪组合,研制了具有较小视场的条纹投影系统。软件产生具有最佳条纹个数的三组正弦条纹图,每组包含四个彼此间有90°相位移动的条纹。根据所测量物体表面颜色和纹理特性,选择投影系统的合适颜色通道投射软件所产生的正弦条纹序列到被测物表面。相机从另一角度获取经被测表面调制的变形条纹图。通过四步相移和最佳条纹选择方法分别计算得到折叠相位图和展开相位图。利用水平精密移动台定位一水平白板到几个已知位置,建立绝对相位和深度之间的关系,获得系统深度方向的数据。微小物体的三维形貌测量实验证明了所研制成像系统的可行性和准确性。

Abstract

A 3D small-field imaging system was established by using the fringe projection technique to measure the small objects having large slopes and/or discontinuous surface. A stereo microscope was used to generate a small-field projecting field and to capture the deformed fringe patterns on the measured small objects. Three fringe sets having the optimum fringe numbers were coded into one major color channel to generate color fringe patterns having the maximum fringe contrast of the captured fringe images. Through one channel of the stereo microscope, a Digital Light Processing(DLP) projector projected these generated color fringe pattern images onto the measured objects surface. From another channel, the fringe patterns were deformed with regard to the object surface and captured by a color CCD camera. The absolute phase of each pixel could be calculated from the captured fringe patterns by using the optimum three-fringe numbers selection method. The relationship between the absolute phase and depth was established to move a white plate to several known positions by using an accurate linear translating stage, so the 3D shape data of the measured objects were obtained. Experimental results on measuring 3D shape of small objects show the accuracy and availability of the developed 3D imaging system.

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中图分类号:TH741

DOI:10.3788/irla201645.0824002

所属栏目:前沿光学成像技术

基金项目:国家自然科学基金委员会与英国皇家学会合作交流项目(61311130138); 国家自然科学基金(61171048); 河北省应用基础研究计划重点基础研究项目(15961701D); 河北省高等学校高层次人才科学研究项目(GCC2014049); 深圳大学省部重点实验室开放基金(GD201401); 长江学者和创新团队发展计划(IRT1232)

收稿日期:2015-12-11

修改稿日期:2016-01-14

网络出版日期:--

作者单位    点击查看

陈 超:河北工业大学 机械工程学院,天津 300130
於燕琴:河北工业大学 机械工程学院,天津 300130
黄淑君:河北工业大学 机械工程学院,天津 300130
刘晓利:深圳大学 教育部广东省光电子器件与系统重点实验室,广东 深圳 518060
徐 静:清华大学 机械工程系,北京 100084
张宗华:河北工业大学 机械工程学院,天津 300130

联系人作者:陈超(504277543@qq.com)

备注:陈超(1987-),男,博士生,主要从事光学检测、条纹自动分析、三维成像及造型方面的研究。

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引用该论文

Chen Chao,Yu Yanqin,Huang Shujun,Liu Xiaoli,Xu Jing,Zhang Zonghua. 3D small-field imaging system[J]. Infrared and Laser Engineering, 2016, 45(8): 0824002

陈 超,於燕琴,黄淑君,刘晓利,徐 静,张宗华. 三维小视场成像系统[J]. 红外与激光工程, 2016, 45(8): 0824002

被引情况

【1】王 柳,陈 超,高 楠,张宗华. 基于自适应条纹投影的高反光物体三维面形测量. 应用光学, 2018, 39(3): 373-378

【2】陈 宇,温欣玲,刘兆瑜,马鹏阁. 稀疏自动编码器视觉特征融合的多弹分类算法研究. 红外与激光工程, 2018, 47(8): 826004--1

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