Accession Number:

ADP011834

Title:

Disk Inspection System by Two Dimensional Birefringence Distribution Measurement

Descriptive Note:

Corporate Author:

TOKYO UNIV OF AGRICULTURE AND TECHNOLOGY (JAPAN)

Report Date:

2000-01-01

Pagination or Media Count:

4.0

Abstract:

Several kinds of disks, such as DVD, MO andor CD-R, for the next generation require high quality of plastic surface. Especially their flatness is very important. Here a disk inspection system is proposed using two dimensional birefringence distribution measurement. Small birefringence is a serious problem that is caused by internal strain, andor residual stress. Moreover it is possible to observe its molecular orientation. The birefringence measurement is necessary to determine the relative retardation and the azimuthal angle of the fast axis in an optical disk. Several images captured by a CCD camera are enough for one birefringence distribution analysis. Experimental procedure and their results of some famous optical disks are discussed.

Subject Categories:

  • Computer Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE