Development of A Non-contact 3-D Free Form Surface Measuring System in Aid of The Maser Model Based Design

借助基于微波激射器模型的设计开发非接触式 3D 自由曲面测量系统

• 批准号: 07555629
• 负责人: MIYOSHI Takashi
• 金额: $ 0.38万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555629/
• 关键词: 3-D form measurement; Optical measurement; On-machine measurement; Reverse engineering; 3-D free form surface; CAD model; Master model; Surface fitting; 金型; 形状処理

In the case of the style design based on a master model which is made by clay or wood, the production of the CAD model by fitting the measured point data has been bottleneck in the design process. Measurement and fitting are the most important process for style design based on the master model. This report describes on development of a new non-contact 3-D free form surface measuring system in aid of the maser model based design. The artifacts we achieved in this study are summarized as follows.A high performance profile sensor for measuring the displacement of the free form surface is developed. The proposed profile sensor called "optical ring image sensor" has two major advantages. First, reflection light from a target surface in optical axis can be detected in all directions using a ring slit. Second, the radius of optical ring images is linearly proportional to the displacement of the surface in optical axis. The measurement principle of the optical ring image sensor is analyzed and … More the properties of this sensor are experimentally measured and discussed not only for both diffuse reflection surface and specular reflection surface with steep angles, but also for reduction of the laser speckle noise which has direst influence on the measurement accuracy and edge profile measurement by detecting the change of optical ring image.Non-cotact on-machine multi-functional measuring system which will be able to measure a 3-D free form surface with high performance. The measuring system is composed of the optical ring image sensor and the vigitizer displacement sensor. The multi-functional measuring method using these sensors is proposed. The sensor scanning offset path is processed and different measuring pitch is set in each area on the surface. It is shown by the measurements of fine free form surfaces that the measuring system make it possible to measure a free form surface in short time and with an accuracy of (]SY.+-[) 10mum.A new fitting method of 3-degree B-spline curve and surface onto the dense measured point data is developed. The method to determine knot location with taking account of curve length and curvature which is one of the important factors for the design concept is proposed. And the parameter is set in consideration of the knot location. Control points of 4-degree B-spline surface are calculated by the inverse translation based on the least-square method. The master model with free form surface is measured by using the developed non-contact 3-D digitizing system. It is shown that the B-spline curve and surface without waviness is fitted to the measured point data with high accuracy and in good condition.The new measurement strategy and fitting algorithm of Coons patch surface onto the measured point data of the master model is proposed. The master model is measured by using the non-contact laser displacement sensor with high density and high accuracy. Coons patches of C2 class are generated based on the B-spline curve fitted with taking account of curvature. The best fitted CAD model of measured point data is obtained. Moreover surface evaluation process for the strategic measurement is shown. Less

在基于粘土或木材制作的主模型进行款式设计的情况下，通过拟合测量点数据来生成CAD模型一直是设计过程中的瓶颈。测量与拟合是基于主模型进行款式设计的重要环节。本文介绍了一种新的非接触式三维自由曲面测量系统的研制。本研究的主要成果如下：1.研制了一种高性能的自由曲面位移测量传感器。被称为“光环图像传感器”的轮廓传感器具有两个主要优点。首先，可以使用环形狭缝在所有方向上检测来自光轴上的目标表面的反射光。第二，光环像的半径与表面在光轴上的位移成线性比例。分析了光学环形图像传感器的测量原理， ...更多信息 对该传感器的特性进行了实验测量和讨论，不仅针对漫反射表面和陡角镜面反射表面，还可以通过检测光环像的变化来降低对测量精度有直接影响的激光散斑噪声，实现边缘轮廓的测量。高性能三维自由曲面。测量系统由光环形图像传感器和光栅位移传感器组成。提出了利用这些传感器进行多功能测量的方法。对传感器的扫描偏移路径进行了处理，并在表面的各个区域设置了不同的测量间距。通过对自由曲面的测量表明，该测量系统可以在短时间内测量自由曲面，测量精度为± SY.提出了一种三次B样条曲线曲面对密集测量点数据的拟合方法。提出了考虑曲线长度和曲率的节点位置确定方法，这是设计概念的重要因素之一。并且考虑结位置来设置参数。采用基于最小二乘法的逆平移方法计算四次B样条曲面的控制顶点。利用研制的非接触式三维数字化系统对具有自由曲面的母模进行了测量。结果表明，无波纹B样条曲线曲面拟合精度高，拟合效果良好，提出了主模型测量点数据的Coons曲面测量策略和拟合算法。采用高密度、高精度的非接触式激光位移传感器对母模进行测量。基于考虑曲率的B样条曲线拟合生成C2类Coons曲面片。得到了测点数据的最佳拟合CAD模型。此外，表面评价过程的战略措施。少

项目成果

takayuki GOTOH, Yasuhiro TAKAYA and Takashi MIYOSHI: "B-Spline Curve Fitting on Non-Contact 3-D Digitizing Data by Taking Curvatures into Consideration" Proceedings of Third International Symposium on Measurement Technology and Intelligent Instruments (IS

takayuki GOTOH、Yasuhiro TAKAYA 和 Takashi MIYOSHI：“B-Spline Curve Fitting on Non-Contact 3-D Digitizing Data by Takes Curvatures”第三届国际测量技术与智能仪器研讨会 (IS) 论文集

高谷裕浩,滝澤暢,三好隆志: "非接触3D形状オンマシン複合計測システムの開発" 日本機会学会第73期全国大会講演論文集. IV. 425-426 (1995)

Hirohiro Takatani、Noburu Takizawa、Takashi Miyoshi：“非接触式 3D 形状机上复杂测量系统的开发”第 73 届日本机械工程师学会全国会议论文集 IV（1995 年）。

高谷裕浩,後藤孝行,三好隆志: "マスタモデル高密度計測点群からのCoonsパッチ曲面の生成" 1996年度日本機械学会第74期全国講演論文集. 京都. 425-426 (1996)

Hirohiro Takatani、Takayuki Goto、Takashi Miyoshi：“从主模型高密度测量点云生成 Coons 贴片表面”第 74 届日本机械工程师学会全国会议论文集，1996 年。京都 425-426 (1996)。

高谷裕浩,後藤孝行,三好隆志: "意匠設計支援システムにおける形状計測と自由曲面生成に関する研究" 1996年度精密工学会秋季大会学術講演会講演論文集. 水戸. 311-312 (1996)

Hirohiro Takatani、Takayuki Goto、Takashi Miyoshi：“设计设计支持系统中的形状测量和自由曲面生成研究”1996 年日本精密工程学会秋季会议学术会议记录 311-312 Mito。

高谷裕浩,李端,高橋哲,三好隆志: "非接触光造形3D形状計測に関する研究" 1996年度精密工学会秋季大会学術講演会講演論文集. 水戸. 559-560 (1996)

Hirohiro Takatani、Dan Li、Satoshi Takahashi、Takashi Miyoshi：“非接触立体光刻 3D 形状测量的研究”1996 年日本精密工程学会秋季会议论文集（1996）。