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Proceedings Paper

Development of a noncontact optical sensor for measuring the shape of a surface and thh thickness of transparent objects
Author(s): Sang Pil Youn; Young Kee Ryu
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Paper Abstract

12 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 extending 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 were 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.

Paper Details

Date Published: 12 February 2001
PDF: 9 pages
Proc. SPIE 4190, Optomechatronic Systems, (12 February 2001); doi: 10.1117/12.417230
Show Author Affiliations
Sang Pil Youn, Sun Moon Univ. (South Korea)
Young Kee Ryu, Sun Moon Univ. (South Korea)

Published in SPIE Proceedings Vol. 4190:
Optomechatronic Systems
Hyungsuck Cho; George K. Knopf, Editor(s)

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