Disk Inspection System by Two Dimensional Birefringence Distribution Measurement

Abstract

Several kinds of disks, such as DVD, MO and/or 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, and/or 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.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2000
Accession Number
ADP011834

Entities

People

  • Natalia Dushkina
  • Toru Yoshizawa
  • Toshiyuki Kanno
  • Yukitoshi Otani

Organizations

  • Tokyo University of Agriculture and Technology

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Birefringence
  • Data Storage Systems
  • Demographic Cohorts
  • Information Processing
  • Inspection
  • Light Sources
  • Measurement
  • Optical Storage
  • Retardation
  • Technical Information Centers
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Computer Vision.
  • Materials Science and Engineering.