Journal ArticleDOI
Applications of a novel phase-shift method using a computer-controlled polarization mechanism
Reads0
Chats0
TLDR
In this paper, a phase-shifting apparatus based on polarization techniques is developed, which changes phase only by rotating a polarizer using a precise step motor and a specially designed decelerator.Abstract:
A new computer-controlled phase-shifting apparatus based on polarization techniques is developed. This apparatus changes phase only by rotating a polarizer using a precise step motor and a specially designed decelerator. The precision of this method can be higher than other methods because of the accurate control of the rotating angle. Four applications of this technique to optical interlerometry and 3-D shape measurements are presented.read more
Citations
More filters
Journal ArticleDOI
Phase-evaluation methods in whole-field optical measurement techniques
TL;DR: The phase-evaluation methods as discussed by the authors use a combination of phase-shifted intensity values, provided by the modulation of one or several fringe patterns, to calculate the principal value of the optical phase.
Journal ArticleDOI
Phase-shifting with computer-generated holograms written on a spatial light modulator.
TL;DR: A new computer-controlled phase-shifting method based on computer-generated holograms displayed on a spatial light modulator (SLM) that demonstrates the feasibility of this approach and discusses possible applications in the field of interferometric null testing of aspheres.
Journal ArticleDOI
A new scheme for phase-shifting ESPI using polarized light
TL;DR: In this article, a new scheme for achieving electronic speckle pattern interferometry (ESPI) is presented, in which two polarizing cube beam splitters placed together are used to achieve the superposition of orthogonal polarized light waves coming from the reference and the test object, respectively.
Journal ArticleDOI
Robust one-beam interferometer with phase-delay control.
TL;DR: In this paper, a robust one-beam interferometer with external phase-delay control is described, where the two arms are together in one collimated beam, and an additional phase delay is introduced by application of an electrical current to the Faraday rotator or by rotation of the polarizer (the latter being of topological origin).
Journal ArticleDOI
Polarization-shifting method for step interferometry
TL;DR: In this article, a phase step interferometry system using polarization shifting is described, which is essentially a Mach-Zehnder interferometer in which the polarization of light travelling through one arm is orthogonal to the polarization travelling through the other arm.