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1.广东工业大学 省部共建精密电子制造技术与装备国家重点实验室, 广东 广州 510006
2.广东工业大学 广东省微纳加工技术与装备重点实验室,广东 广州 510006
3.广东工业大学 广东省信息物理融合系统重点实验室,广东 广州 510006
Received:11 July 2022,
Revised:22 August 2022,
Published:10 January 2023
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王瑞洲,梁炽聪,蔡远馨等.离面位移激励下微视觉运动追踪精度劣化特性[J].光学精密工程,2023,31(01):119-128.
WANG Ruizhou,LIANG Chicong,CAI Yuanxin,et al.Degradation characteristics of in-focused-plane micro-vision motion-tracking accuracy excited by out-of-focused-plane displacements[J].Optics and Precision Engineering,2023,31(01):119-128.
王瑞洲,梁炽聪,蔡远馨等.离面位移激励下微视觉运动追踪精度劣化特性[J].光学精密工程,2023,31(01):119-128. DOI: 10.37188/OPE.20233101.0119.
WANG Ruizhou,LIANG Chicong,CAI Yuanxin,et al.Degradation characteristics of in-focused-plane micro-vision motion-tracking accuracy excited by out-of-focused-plane displacements[J].Optics and Precision Engineering,2023,31(01):119-128. DOI: 10.37188/OPE.20233101.0119.
为在微米级尺度量化表述离面位移激励值-聚焦面内微视觉运动追踪精度劣化值的映射特性,使用光学显微镜、工业相机和空间纳米定位平台进行实验研究。首先,分析离面位移的形成机理,使用方差函数评价图像清晰度,搜索最佳对焦平面并设定为聚焦平面,作为计算离面位移的基准。其次,设计空间多自由度纳米台,将其末端执行器作为微视觉追踪目标,生成聚焦平面内的运动轨迹,同时同步生成可控可测的离面位移。然后,选取灰度值模板匹配法与感兴趣区域划分法作为当前微视觉运动追踪算法,测量聚焦面内的运动轨迹。最后,加工纳米台样机,搭建微视觉运动追踪系统,使用电容传感器作为评价手段,计算不同离面位移引起的微视觉运动追踪精度劣化数值。实验结果表明,微视觉运动追踪精度随着离面位移的增大而不断劣化,具有显著且可量化的相关性。针对给定的76.1 μm×63.7 μm视场、15 Hz采样率与灰度值模板匹配法,(7.7±2.5) μm或更大的离面位移导致微视觉测量系统完全失效。
To quantitatively describe the effect of out-of-focused-plane displacements on the in-focused-plane micro-vision motion-tracking accuracy, a method based on an optical microscope, an industrial camera, and a spatial nano-positioning stage is proposed in this work. First, the formation mechanism of out-of-focused-plane displacements was analyzed. The variance function was employed to evaluate the sharpness of the image and search for the best-focused plane. The searched plane was used as the baseline to calculate out-of-focused-plane displacements. Second, a spatial nano-positioning stage was designed with multiple degrees of freedom. The end-effector served as the target to be tracked by the micro-vision. When generating in-focused-plane displacements, controllable and measurable out-of-focused-plane displacements were also produced simultaneously and synchronously by the end-effector. Third, the gray-value-based template matching approach was selected and combined with the region-of-interest method. This approach served as a representative micro-vision motion-tracking algorithm. Finally, the prototype of the nano-positioning stage was fabricated, and the micro-vision motion-tracking experimental system was constructed. Capacitive sensors were employed as evaluation tools. The degradation values of the micro-vision motion-tracking accuracy when excited by different out-of-focused-plane displacements were quantified. The experimental results indicate that out-of-focused-plane displacements directly contribute to accuracy degradation. The displacements and degradation were significantly correlated. The area of the proposed viewing field was 76.1 μm×63.7 μm, the sampling frequency was 15 Hz, and the gray-value-based template-matching approach was employed. When the out-of-focused-plane displacement reached (7.7±2.5) μm or larger, the micro-vision system was rendered inoperable.
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