Open AccessFlatness measurement by a grazing Ronchi test
Author(s) -
Noé Alcalá Ochoa,
Miguel Mora-González,
Fernando Mendoza Santoyo
Publication year - 2003
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.11.002177
Subject(s) - optics , flatness (cosmology) , liquid crystal display , grating , phase (matter) , amplitude , measure (data warehouse) , physics , computer science , cosmology , quantum mechanics , database
The Ronchi test with a LCD amplitude sinusoidal grating is used for testing nominally flat surfaces. We prove that it is possible to measure flat surfaces without using a reference element by modifying the common optical Ronchi set up. The Ronchi rulings are computer generated and displayed on the LCD. By displaying various phase-shifted rulings and capturing the corresponding images, the phase is obtained with the conventional phase-shifting algorithms. Theoretical and experimental results are shown.