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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Published on: October 11, 2016

Spatial phase-shifting characteristic of double grating interferometer.

Yang Song¹, Yunyun Chen, Anzhi He

¹Department of information physics & engineering, Nanjing University of Science & Technology Nanjing, 210094 PR China. sy0204@mail.njust.edu.cn

|December 10, 2009

Summary

This summary is machine-generated.

This study reveals the spatial phase-shifting capability of double grating interferometers. Stable phase shifts are demonstrated, dependent on grating properties and separation, even with phase objects present.

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Area of Science:

Optics and Photonics
Interferometry
Diffraction Optics

Background:

Double grating interferometers typically utilize temporal phase-shifting for wavefront analysis.
Spatial phase-shifting characteristics of these interferometers have not been extensively explored.

Purpose of the Study:

To present and analyze the spatial phase-shifting characteristics of a double grating interferometer.
To derive the intensity distributions of interferograms produced by double gratings.
To investigate the phase shift behavior with and without phase objects.

Main Methods:

Application of scalar diffraction theory to derive explicit intensity distributions of interferograms.
Analysis of phase shifts between different diffraction orders (plus-first, zero, minus-first).
Investigation of phase shift dependency on grating period, inter-grating distance, and phase objects.

Main Results:

A stable spatial phase shift is identified between the plus-first, zero, and minus-first order interferograms.
Phase shift is independent of phase objects and determined solely by grating period and separation.
Phase shifts remain consistent at specific points within interferograms even when phase objects are present.
A triple grating interferometer is proposed to generate at least four simultaneous phase-shifted interferograms.

Conclusions:

Double grating interferometers exhibit inherent spatial phase-shifting properties.
This spatial phase-shifting mechanism offers a stable method for phase information retrieval.
The findings extend to triple grating systems, enabling multi-phase-shifted interferometry.