A full-field heterodyne polariscope for using new image signal process

Yu-Lung Lo, H. W. Chih, C. Y. Yeh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study develops a heterodyne polariscope for measuring the two-dimensional principal axis and phase retardation in a linear birefnngence material using novel three-frame and two-frame integrating-bucket methods and a Charge Couple Device (CCD). By using a CPLD (Complex Programmable Logic Device) to provide an external trigger to the CCD, integrating buckets with multiple frames are achieved. The advantages of the proposed three-frame and two-frame integrating-bucket methods include a simpler signal processing algorithm based on fewer frames and the elimination of flyback error caused by a saw-tooth modulation signal at higher frequencies. A quartz quarter-wave plate is chosen for demonstration purposes. It is shown that the three-frame integrating-bucket method has an average absolute error of 0.39° in the principal axis measurement and an average error of 0.61° in the phase retardation measurement for measurements at the same pixel. The long-term standard deviations of the phase stability calculated using the novel three-frame method and the conventional four-frame integrating-bucket method are 0.4678° and 0.4733°, respectively. Therefore, it can be surmised that the two methods have similar measurement capabilities. However, the conventional four-frame integrating-bucket method is readily contaminated by flyback error under saw-tooth modulation.

Original languageEnglish
Title of host publicationProceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Pages1596-1602
Number of pages7
Publication statusPublished - 2006 Oct 31
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006 - Saint Louis, MO, United States
Duration: 2006 Jun 42006 Jun 7

Publication series

NameProceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Volume3

Other

OtherSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
CountryUnited States
CitySaint Louis, MO
Period06-06-0406-06-07

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Fingerprint Dive into the research topics of 'A full-field heterodyne polariscope for using new image signal process'. Together they form a unique fingerprint.

Cite this