Title :
A polarization image method for lens decentration measurement
Author :
Huang, Kuo-Cheng ; Chang, Chun-Li ; Wu, Wen-Hong
Author_Institution :
Syst. Control&Integration Div., Nat. Appl. Res. Labs., Hsinchu, Taiwan
Abstract :
The tilt and decenter error of lens is usually induced by lens manufacturing process, injection molding or glass molding. The paper presents a polarization image method for measuring the tilt and decenter of lens. At first, to put the lens under test between two linear polarizers, and then a focused or divergent polarized beam will pass through a half-wave plate, once the lens has a shape error, the polarization image pattern and color will be change. Finally, the lens shape error can be computed by image processing.
Keywords :
image colour analysis; injection moulding; lenses; optical retarders; polarisation; glass molding; half-wave plate; image color; image processing; injection molding; lens decentration measurement; lens shape error; polarization image method; polarization image pattern; Focusing; Glass; Image processing; Injection molding; Lenses; Manufacturing processes; Optical retarders; Polarization; Shape; Testing; decenter; polarization image; tilt;
Conference_Titel :
Instrumentation and Measurement Technology Conference (I2MTC), 2010 IEEE
Conference_Location :
Austin, TX
Print_ISBN :
978-1-4244-2832-8
Electronic_ISBN :
1091-5281
DOI :
10.1109/IMTC.2010.5488246
