0

Full Content is available to subscribers

Subscribe/Learn More  >
Proceedings Article

Simultaneous phase-shift interferometer

[+] Author Affiliations
Chris L. Koliopoulos

Phase Shift Technology, Inc. (USA)

Proc. SPIE 1531, Advanced Optical Manufacturing and Testing II, 119 (January 1, 1992); doi:10.1117/12.134852
Text Size: A A A
From Conference Volume 1531

  • Advanced Optical Manufacturing and Testing II
  • Victor J. Doherty
  • | February 01, 1991

abstract

Interferometric testing of large optics over long path lengths has been hampered by vibration in the test set-up. The precision of phase measuring interferometry has not been able to provide measurements in vibration environments due to the time required to perform the required phase shift between multiple images of the interferogram. The simultaneous phase shift interferometer (SPSI) has eliminated effects of vibration from phase measurements by creating four separate phase shifted interferograms simultaneously, viewed with four CCD cameras. The CCD cameras provide electronic shutter exposure control which effectively 'freezes' the interference patterns producing high contrast interferograms even with severe vibration. Polarization optics are used to maintain the appropriate phase relationships between the four interferograms. Four separate synchronized video digitizers are used to digitize the interferograms to a maximum resolution of 380 by 240 pixels by 8 bits per pixel. The phase at each pixel in the interferogram is calculated by a PC/486 based microcomputer which also provides complete analysis and graphics of the measurement. Averaging of multiple measurements to reduce the effects of air turbulence is done automatically.

© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Chris L. Koliopoulos
"Simultaneous phase-shift interferometer", Proc. SPIE 1531, Advanced Optical Manufacturing and Testing II, 119 (January 1, 1992); doi:10.1117/12.134852; http://dx.doi.org/10.1117/12.134852


Access This Article
Sign In to Access Full Content
Please Wait... Processing your request... Please Wait.
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
 

Figures

Tables

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement

Buy this article ($18 for members, $25 for non-members).
Sign In