Development of a noncontact optical sensor for measuring the shape of a surface and thickness of transparent objects
Development of a noncontact optical sensor for measuring the shape of a surface and thickness of transparent objects
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开发用于测量透明物体表面形状和厚度的非接触式光学传感器
DOI：
10.1117/1.1355260
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发表时间：
2001
影响因子：
1.3
通讯作者：
Jong
中科院分区：
文献类型：
--
作者：
Y. Ryu;Choonsuk Oh;Jong
本文研究了一种非接触式光学传感器，用于测量液晶显示器玻璃面板等透明板材的形状和厚度。获得透明板的形状或厚度的常规方法是接触型传感器，例如LVDT（线性可变差分Transformer）。由于传感器的尖端与物体表面之间的接触，尖端被磨损。此外，高温浇铸玻璃也导致传感器本体尺寸的增大。由于这些原因，传感器的精度降低。为了克服这些问题，我们提出了一种低成本的非接触式光学传感器，它是由一个全息激光单元用于光盘播放器的光学头和塑料透镜。为了评估所提出的光学传感器的性能，在各种测量条件下进行了一系列实验。实验结果表明，该传感器对透明平板的形状测量具有良好的性能。
This paper deals with the non-contact optical sensor to measure the shape and the thickness of transparent plates such as glass panel of LCD(Liquid Crystal Display). The conventional methods to obtain the shape or thickness of transparent plates are contact type sensor such as LVDT(Linear Variable Differential Transformer). Due to the contact between the tip of the sensor and the surface of objects, the tip is abraded. In addition the casting glass under high temperature results in extendin g the size of sensor body. The accuracy of the sensor is degraded due to these reasons. In this paper, to overcome these problems, we proposed a low cost non-contact optical sensor that is composed of a Hologram laser unit used for optical pickup of CD player and a plastic lens. To evaluate the performance of the proposed optical sensor, a series of experiments ware performed for various measurement conditions. Based upon observation of the experimental results, the proposed sensor shows a good performance in measuring the shape of transparent plates.