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首页> 外文会议>ICO20: Optical Devices and Instruments >Moire Deflectometer for measuring distortion in sheet glasses
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Moire Deflectometer for measuring distortion in sheet glasses

机译：莫尔偏转仪用于测量平板玻璃的变形

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摘要

In glass casting or shaping processes, some times wavy and distortion defects are developed in glass sheets. Specifying the locations of these defects and measuring the deflections they cause are significant parameters in many applications. There are several techniques for observing and measuring these defects, but the technique we introduce in this work is more simple and flexible and can be easy installed in production line for quality controlling purposes. The presented deflectometer functions in the following way. The imaging system of the device forms an image of large-scale low frequency linear periodical pattern painted on a vertical plane on a transmission grating. The distance between the object grating (painted pattern) and the second grating is so that the frequencies of the image grating and the second (probe) grating are practically the same. There is a small angle between the lines of the latter gratings to form moire fringes. A CCD camera transfers the moire fringes to a PC. By applying phase shifting technique, which is realized by shifting the probe grating in definite steps in its plane in a direction perpendicular to its lines, the phase distribution due to imprecations in optical system and gratings, are specified, At this stage the defected sheet glass is installed between the object grating and the imaging system and the distorted moire pattern is processed as described before. The difference between two-phase distributions is the phase distribution caused by the defects in the glass, which can be easily converted into the required ray deflections. All the processes are carried out automatically in a time less than 30 seconds and the accuracy of the measurement is of the order of 20 arc seconds.
机译：在玻璃铸造或成形过程中，玻璃板有时会出现波纹和变形缺陷。在许多应用中，指定这些缺陷的位置并测量它们引起的变形是重要的参数。有几种观察和测量这些缺陷的技术，但是我们在这项工作中引入的技术更加简单灵活，可以方便地安装在生产线中以进行质量控制。所提供的偏转仪的功能如下。该装置的成像系统形成了在透射光栅的垂直平面上绘制的大规模低频线性周期性图案的图像。物体光栅（涂漆的图案）和第二光栅之间的距离是使得图像光栅和第二（探针）光栅的频率实际上是相同的。后面的光栅的线之间有一个小角度，以形成莫尔条纹。 CCD相机将波纹条纹传输到PC。通过应用相移技术，该技术是通过在垂直于其光栅线的方向上在其平面中以一定步长移动探针光栅实现的，从而确定了由于光学系统和光栅中的杂质引起的相位分布。如前所述，在物体光栅和成像系统之间安装了光栅，并且畸变的波纹图案被处理。两相分布之间的差异是由玻璃中的缺陷引起的相分布，可以很容易地将其转换为所需的射线偏转。所有过程均在不到30秒的时间内自动执行，测量精度约为20弧秒。

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