基于离焦二值显示和条纹投影的复合表面三维测量方法  

Three-dimensional shape measurement of composite surface based on defocused binary display and fringe projection

作　　者：邵金凤 倪育博 孟召宗 高楠[1] 高宇森 杨泽青[1] 张国锋[2] 尹伟[3] 赵洪伟 张宗华[1] Shao Jinfeng;Ni Yubo;Meng Zhaozong;Gao Nan;Gao Yusen;Yang Zeqing;Zhang Guofeng;Yin Wei;Zhao Hongwei;Zhang Zonghua(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China;School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an,Shaanxi 710049,China;National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi’an,Shaanxi 710065,China)

机构地区：[1]河北工业大学机械工程学院,天津300401 [2]西安交通大学机械工程学院,陕西西安710049 [3]中国飞机强度研究所强度与结构完整性全国重点实验室,陕西西安710065

出　　处：《光电工程》2024年第4期88-99,共12页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目(U2341275,52075147);河北省教育厅科学研究资助项目(JZX2024021)。

摘　　要：由于复合表面物体中漫反射部分和镜面部分反射性质不同,受到相机景深的限制,镜面成像的正弦条纹发生离焦,从而引起相位误差。为了实现复合表面物体的高效、高精度测量,本文提出了一种离焦二值结合正弦条纹的复合表面三维形貌测量方法。首先,本文基于刃边法与二次模糊法对系统离焦程度进行分区标定,解决了由于相机倾斜放置导致参考面离焦程度不同的问题。然后,建立二值条纹相位误差模型,确定最佳条纹宽度和离焦量范围。最后,对轻微离焦区域的二值条纹进行离焦补偿,确保相机采集的条纹均在最佳离焦范围内。在此基础上进行三维形貌测量。实验结果表明,所提方法使镜面部分误差从原来的0.033 mm降至0.019 mm,提高了复合表面测量精度。Due to the different reflective properties of the diffuse and specular components in composite surface objects and the limitations imposed by the camera depth of field,defocusing of sinusoidal fringes occurs in specular imaging,leading to phase errors.To achieve the efficient and high-precision measurement of composite surface objects,this paper proposes a method for three-dimensional surface topography measurement by combining defocused binary patterns with sinusoidal fringes.Firstly,the paper partitions and calibrates the defocus level of the system based on the edge and second-order blur methods,addressing the issue of varying defocus levels of the reference surface due to the tilted placement of the camera.Then,a binary fringe phase error model is established to determine the optimal fringe width and the defocus range.Finally,defocus compensation is applied to the binary fringes in the slightly defocused region,ensuring that the captured fringes are within the optimal defocus range.Three-dimensional surface topography measurement is conducted based on this approach.Experimental results show that the proposed method reduces the error in the specular component from 0.033 mm to 0.019 mm,thereby improving the accuracy of composite surface measurement.

关 键 词：复合表面测量 二值离焦技术 离焦估计 参数选择 离焦补偿 

分 类 号：TH741[机械工程—光学工程]