Vol. 52, Issue 2, pp. 229-242

Vol. 52 Issue 2 pp. 229-242

An exact approach for radius of curvature measurement in a calibration test sphere

Jaime M. Jalife-Chavira, Gerardo Trujillo-Schiaffino, Paloma G. Mendoza-Villegas, Didia P. Salas-Peimbert, Marcelino Anguiano-Morales, Luis F. Corral-Martínez, Edgar Zendejas-Hernández


keratometry, radius of curvature, diopters, cosine fringe pattern, film


In this paper we present a technique to measure the radius of curvature of a test sphere based on the relation between acquired images of a circular cosine fringe pattern and size of virtual image formed on the calibration test surface. Radius of curvature is calculated with the exact equation proposed, using the parameters of the optical setup. Fringe pattern evaluation was performed by locating extrema indices. The mathematical formulation as well as the experimental setup and results are presented. After applying a linear fit algorithm to the data as a method of compensation, obtained results show an error within the tolerance established by the ISO 10343 specifications.

Vol. 52
Issue 2
pp. 229-242

1.32 MB
OPTICA APPLICATA - a quarterly of the Wrocław University of Science and Technology, Faculty of Fundamental Problems of Technology