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Optical Engineering

Simultaneous observation of phase-stepped photoelastic fringes using a pixelated microretarder array
Author(s): Satoru Yoneyama; Hisao Kikuta; Kosuke Moriwaki
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Paper Abstract

An instantaneous phase stepping and subsequent phase analysis method, using a charge-coupled device (CCD) camera with a pixelated form-birefringent microretarder array, is proposed for 2-D birefringence distribution measurement. A birefringent sample placed behind a polarizer and a quarter-wave plate is analyzed by the proposed method. Light emerging from the sample is recorded using a CCD camera that has a pixelated microretarder array on the CCD plane. This microretarder array has four different principal directions. That is, an image obtained by the CCD camera contains four data corresponding to four different optical axes of the retarder. The four images separated from the image recorded by the CCD camera are reconstructed using gray-level interpolation. Then, the distributions of the Stokes parameters that represent the state of polarization are calculated from the four images. The birefringence parameters, that is, the angle of the principal axis and the phase retardation, are then obtained from these Stokes parameters. This method is applicable to real-time inspection of optical elements as well as the study of the mechanics of time-dependent materials, because multiple exposures are unnecessary for sufficient data acquisition in the completion of data analysis.

Paper Details

Date Published: 1 August 2006
PDF: 7 pages
Opt. Eng. 45(8) 083604 doi: 10.1117/1.2335894
Published in: Optical Engineering Volume 45, Issue 8
Show Author Affiliations
Satoru Yoneyama, Osaka Prefecture Univ. (Japan)
Hisao Kikuta, Osaka Prefecture Univ. (Japan)
Kosuke Moriwaki, Technology Research Institute of Osaka Prefecture (Japan)

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