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一种基于自动对焦的非球面测量系统 总被引:1,自引:0,他引:1
影响高精度非球面磨削加工精度的不仅是机床、刀具和数控技术等参数,而且取决于制造系统所采用的测试手段和所能达到的测量精度.针对非球面制造系统的测量特点,将光栅测量技术和光学显微镜自动对焦技术引入环节,进而提高对非球面工件的测量精度,解决了制约非球面加工精度提高的测量问题. 相似文献
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影响高精度非球面磨削加工精度的不仅是机床、刀具和数控技术等参数,而且取决于制造系统所采用测试手段和所能达到测量精度。本文针对非球面制造系统的测量特点,将光栅测量技术和光学显微镜自动对焦技术引入环节,进而提高对非球面工件测量精度,解决了制约非球面加工精度提高的测量问题。 相似文献
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用图象光载波方法进行表面三维形状与振型的自动测量 总被引:2,自引:0,他引:2
衡伟 《振动、测试与诊断》1995,15(2):51-56
讨论从被物体表面形状或振型调制的图象光载波信号提取该表面深度或振型全场信息的测量方法,结合成熟的计算机图象处理技术,该方法可构成在精度、量程、自动化程度方面具有很强适应性的无接触测量系统,文中给出了自动测量系统的构成设计,并给出了测量实例。 相似文献
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本文试图通过对厚度测量系统的原理、结构、信号处理和误差补偿等诸环节的设计分析,来叙述扫描方式的厚度测量系统的设计方法和改善系统精度的途径。 相似文献
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基于结构光测量系统的误差传递分析 总被引:3,自引:2,他引:1
结构光系统作为视觉测量中常见的技术之一,其测量精度直接影响了该系统的应用范围。针对交比不变原理的结构光光平面标定方法,利用误差分析理论和矩阵扰动原理分别从系统的测量误差和光平面标定误差进行分析,提出了结构光测量系统的误差传递模型。并给出了一个特例情况下的精度要求,即满足在1000mm的测量距离上获得±0.5mm的测量精度情况下,各标定参数所需要满足的精度要求,以及标定样本提取的精度要求。通过实测实验结果验证了误差分析的有效性。该误差分析为提高结构光系统的测量精度提供了理论依据。 相似文献
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线结构光测量数据的自动拼合方法 总被引:7,自引:0,他引:7
提出了一种由三坐标测量机、线结构光测头和回转工作台构成的四轴扫描测量系统。在该系统中使回转工作台相对于测量机的工作台倾斜一定角度放置,在一次装夹下可测量物体的四周和顶部。为了将多角度下测量的数据拼合在一起,建立了数据自动拼合的数学模型,提出了转台轴线方向检测装置和检测方法,以此为基础对自动拼合模型进行简化并求出其中的未知参数。对多片数据的拼合精度进行了测试和分析,对一典型样件进行测量。结果表明,该方法能在一次装夹下完整测量结构复杂的形体,测量数据的拼合具有很高的精度。 相似文献
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利用位置敏感探测器(PSD)频率响应高、接口电路简单、数据采集快等特点,设计了一种小型、动态激光三维测头。该测头采用激光三角法原理,利用凹凸双透镜光学系统进行激光缩束以提高测量精度,利用平面反射镜增加光程以减小体积,并对各具体参数和整体结构进行了详细的设计。该测头系统拥有体积小,精度高,反映快的优点。 相似文献
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Estimation of sphericity by means of statistical processing for roundness of spherical parts 总被引:2,自引:0,他引:2
Tohru Kanada 《Precision Engineering》1997,20(2):117-122
In the industrial standard of “balls for rolling bearings,” deviation from spherical form (sphericity) is defined as follows. It is usually determined by numerically evaluating the ball profiles, in two or three equatorial planes at 90° to each other, and recording them on a polar chart. Furthermore, the standard indicates that the minimum circumscribed circle method is relatively simple and generally satisfactory for ball profiles, and the method is also based on the assumption that two or three equatorial profiles at 90° to each other are a good indication of the deviation from spherical form. The measurement method for three-dimensional (3-D) spherical profiles is two-dimensional (2-D), because a practical (3-D) measuring system for spherical forms remains to be developed. This is another important problem. Using the method recommended in the standard, the deviation value is significantly underestimated, because the major part of the 3-D surface is not measured. Verification of the above-mentioned assumption is also difficult in general. If numerous measurements of 2-D profiles are performed, the degree of underestimation decreases. However, this requires much time and labor. In this study, a 3-D deviation value from spherical form is calculated from a few 2-D roundness values obtained using a general roundness measuring system with a statistical technique. Furthermore, an appropriate number of measuring cross sections necessary to estimate the sphericity with high reliability are presented. 相似文献
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硬质合金刀片CAD/CAM系统三维扫描测量输入技术 总被引:1,自引:0,他引:1
本文在综述了硬质合金刀片CAT/CAD/CAM一体化技术基础上,引进测量几何造型概念,详细介绍了硬质合金刀片扫描测量输入系统硬件及软件的设计特点,分析了一些特征扫描測量算法,最后给出了一个扫描测量实例。 相似文献
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位相测量轮廓术(PMP)是将被测物体表面投影光栅条纹的灰度分布变换为位相分布,从而求得被测物体高度分布的轮廓测量技术。本文讨论PMP测量系统参数:抽样间隔X、Y;光栅周期p、q;最大系统噪声nmax以及光瞳位置参数d、L的选择和测定。这些参数的合理选择与精确测定,将提高位相测量以及位相-高度转换的精度。 相似文献
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Xie Zexiao Zhang Chengguo Zhang Qiumei Zhang Guoxiong 《The International Journal of Advanced Manufacturing Technology》2005,26(4):391-398
Today several new kinds of laser beam sensors appear with high resolution and accuracy and find their applications in reverse engineering and quality control. Due to the incapability of changing their orientations continuously in response to the surface fluctuation of a part to be measured, they are not competent for measuring parts with complicated structures. In this paper a five-axis laser scanning system integrated with a CMM, a laser beam sensor and a PH10 rotary head is proposed, which can measure complicated parts by frequently indexing the laser sensor approximately consistent with the normal direction of the surface. As the laser value is a 1-D data and the measured data must be given in 3-D expression in the world coordinate system, a system model for coordinate transformation is established. An “equivalent probe” approach is presented for system verification, and an iterative verifying process is adopted to eliminate the verification error caused by the inclination error of the laser sensor. Experiment study shows that the system can measure a part from any direction with an accuracy of 30 μm. 相似文献
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为了快速、准确地获得大尺寸工业产品或带有深槽孔工件的关键点三维坐标,本文基于工业近景摄影测量理论、立体视觉技术等,研究并实现了两种工业便携式、接触式光学探针测量系统。研究了测量系统涉及的探针设计、探针标定以及三维点解算等关键技术,设计了点阵式和手持相机式两种适用于不同工业场合的工业探针。针对点阵式探针的测量,提出了一种用于解算探针坐标系与世界坐标系相对关系的点云匹配方法。此外,采用拟合虚拟球的方法准确标定了两种探针的内部参数。最后,通过对比标准球与三坐标测量机的测量结果,得到系统的测量精度可达0.1 mm/m。该精度满足一般大、中型工件的三维点测量精度标准。 相似文献