1 April 2001 Development of a noncontact optical sensor for measuring the shape of a surface and thickness of transparent objects
Author Affiliations +
Optical Engineering, 40(4), (2001). doi:10.1117/1.1355260
Abstract
This paper deals with a noncontact optical sensor to measure the shape and the thickness of transparent plates such as glass panels of liquid crystal displays. The conventional methods to obtain the shape or thickness of transparent plates depend on contact-type sensors such as linear variable differential transformers. Due to the contact between the tip of the sensor and the surface of objects, the tip is abraded. In addition the casting of glass at high temperature increases the size of the sensor body. The accuracy of the sensor is degraded for these reasons. To overcome these problems, we proposed a low-cost and simple noncontact optical sensor that is composed of a hologram laser unit (of the type used for optical pickup in CD players) and a plastic lens. To evaluate the performance of the proposed optical sensor, a series of experiments were performed for various measurement conditions. The proposed sensor shows excellent performance in measuring the shape of transparent plates.
Young Kee Ryu, Choonsuk Oh, Jong-Seul Lim, "Development of a noncontact optical sensor for measuring the shape of a surface and thickness of transparent objects," Optical Engineering 40(4), (1 April 2001). http://dx.doi.org/10.1117/1.1355260
JOURNAL ARTICLE
3 PAGES


SHARE
KEYWORDS
Glasses

Sensors

Optical sensors

Actuators

Compact discs

Holograms

LCDs

Back to Top