Development of a noncontact optical sensor for measuring the shape of a surface and thickness of transparent objects

Young Kee Ryu; Choonsuk Oh; Jong-Seul Lim

doi:10.1117/1.1355260

1 April 2001 Development of a noncontact optical sensor for measuring the shape of a surface and thickness of transparent objects

Young Kee Ryu, Choonsuk Oh, Jong-Seul Lim

Author Affiliations +

Optical Engineering, Vol. 40, Issue 4, (April 2001). https://doi.org/10.1117/1.1355260

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.

©(2001) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Young Kee Ryu, Choonsuk Oh, and 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). https://doi.org/10.1117/1.1355260

Published: 1 April 2001

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available