Abstract

We can measure the phase of a static wave front with great accuracy and resolution by using standard phase-shifting interferometry techniques. Since wave-front changes during or between the acquisition of the individual interferograms cause measurement error, the measurement of transient phenomena still requires an essentially static wave front during acquisition. The 2 + 1 phase-shifting algorithm, originally developed to freeze out vibration when testing large optics, permits fast acquisition by requiring only two time-critical interferograms. The third interferogram provides a dc level or null and is only required once. The current 2 + 1 implementation is a low-cost interferometric system that is capable of phase acquisition in <2 ms at video rates. The repetition rate is limited by the readout time of the detector. The 2 + 1 has produced map movies of turbulent air acquired at the 30-Hz frame rate of a CCD camera.

© 1992 Optical Society of America

Phase shifting interferometry in the presence of vibration: a new algorithm and system

Peter L. Wizinowich
Appl. Opt. 29(22) 3271-3279 (1990)

Video-rate fringe analyzer based on phase-shifting electronic moiré patterns

Jun-ichi Kato, Ichirou Yamaguchi, Toru Nakamura, and Shigesumi Kuwashima
Appl. Opt. 36(32) 8403-8412 (1997)

Video-rate terahertz interferometric and synthetic aperture imaging

Zhiwei Liu, Ke Su, Dale E. Gary, John F. Federici, Robert B. Barat, and Zoi-Heleni Michalopoulou
Appl. Opt. 48(19) 3788-3795 (2009)

Direct phase measurement interferometer working at 3.8 μm

K. N. Prettyjohns, S. DeVore, Eustace Dereniak, and James C. Wyant
Appl. Opt. 24(14) 2211-2216 (1985)

Video-rate processing in tomographic phase microscopy of biological cells using CUDA

Gili Dardikman, Mor Habaza, Laura Waller, and Natan T. Shaked
Opt. Express 24(11) 11839-11854 (2016)