摘要
提出了一种基于远心镜头与曲面屏的非连续镜面三维形貌测量新方法,在增加大曲率镜面成像范围的同时,提高了三维数据的测量精度。首先,在显示屏上显示标准正弦条纹图,相机分别记录经由平面参考镜和被测镜面反射的正弦条纹图像。然后,利用四步相移法和最佳三条纹选择法得到对应的相位分布值。接着,与平面参考镜比较,得到经由被测镜面物体表面调制后的相位变化。根据所建立的数学模型,推导相位与深度间对应关系,并对其系统参数进行标定。最后,对大曲率镜面和非连续镜面标准台阶进行了测量,验证了该方法的精度和有效性。
A new method based on a telecentric lens and curved screen is proposed to measure a discontinuous mirror’s three-dimensional(3D)shape.This technique increases the imaging range of mirrors having large curvature and improves the measurement accuracy of 3D data.First,a display screen shows sinusoidal fringe patterns,and a camera records the sinusoidal fringe images reflected through the plane reference mirror and the measured mirror.Second,the corresponding phase distribution is obtained using the four-step phase shift method and the optimal three fringe selection method.The phase change modulated by the object surface of the measured mirror is obtained by comparison to the plane reference mirror.Furthermore,according to the established mathematical model,the relationship between phase and depth is deduced,and the system parameters are calibrated.Finally,measurements are taken to verify the accuracy and effectiveness of the proposed method using an artificial mirror step with large curvature and a discontinuous mirror.
作者
李煜
张宗华
高楠
孟召宗
李梓榆
王张颖
Li Yu;Zhang Zonghua;Gao Nan;Meng Zhaozong;Li Ziyu;Wang Zhangying(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China;Centre for Precision Technologies,University of Huddersfield,West Yorkshire HD13DH,UK)
出处
《激光与光电子学进展》
CSCD
北大核心
2023年第7期299-304,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金(52075147)。
关键词
测量
远心镜头
曲面屏
相位测量偏折术
光学面形测量
measurement
telecentric lens
curved screen
phase measuring deflectometry
optical surface measurement
