Challenges in white-light phase-shifting interferometry

Joanna Schmit; Artur G. Olszak

doi:10.1117/12.472211

20 June 2002 Challenges in white-light phase-shifting interferometry

Joanna Schmit, Artur G. Olszak

Proceedings Volume 4777, Interferometry XI: Techniques and Analysis; (2002) https://doi.org/10.1117/12.472211
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

White light phase shifting interferometric (WLPSI) techniques allow high precision shape measurement thanks to a combination of phase detection of the interference fringes and detection of the position of the fringe envelope. The WLPSI technique gives excellent results as long as ideal scanning and system aberration-free conditions exist. Ideal conditions rarely exist, however, and errors creep into measurements from a number of error sources. Scanner errors affect the measured phase of the object surface, and the finite size of the optical system and its aberrations cause a variation in the offset between the phase and coherence peak across the field of view of the system. This variation in turn causes unwanted 2π jumps in the phase portion of the measurement. This paper shows ways to overcome these challenges. We propose a real-time solution to correcting scanning position influence on measurement in WLPSI algorithm. In addition, we present adaptive phase shifting algorithms that avoid these jumps. Our overall technique is simple, very fast and yields highly precise and accurate results.

Citation Download Citation

Joanna Schmit and Artur G. Olszak "Challenges in white-light phase-shifting interferometry", Proc. SPIE 4777, Interferometry XI: Techniques and Analysis, (20 June 2002); https://doi.org/10.1117/12.472211

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