0000000000412011
AUTHOR
J. C. Barreiro
showing 4 related works from this author
Continuously Variable Periodic Test Target
1987
CONTINUOUSLY VARIABLE PERIODIC TEST TARGETP. ANDRES*, J. OJEDA- CASTANEDAt, and J.C. BARREIRO*tINAOE, Apartado Postal 216, 72000 Puebla, Pue., Mexico*Departamento de Optica, Universidad de Valencia, 46100 Burjasot, Spain1. INTRODUCTIONThe modulus of the optical transfer function (MTF) of the eye or any other optical system is usuallyevaluated by imaging either several gratings each with different spatial frequency, or a single test tar-get having patterns with different frequencies (USAF resolution chart). In any of these two usual proce-dures, the measurement of the MTF is made at discrete values of the spatial frequency.Here we describe a method based on the self -imaging phenomenon for p…
Degree of coherence: a lensless measuring technique.
2009
We present a technique for measuring the degree of coherence that is based on the self-imaging phenomenon. The technique is lensless, has multiplexing capabilities, and can work with high light throughput. Experimental verifications are given.
Lau Effect And Binary Logic
1989
The Lau effect is applied to implement the whole set of binary logic operations optically. Our technique works with spatially incoherent light and does not require lenses or any other optical accessory.
Use of a grating in a coherent optical-processing configuration for evaluating the refractive index of a lens: comments
2010
La methode consiste en la determination de l'indice de refraction de la lentille d'essai a partir de la separation entre 2 ordres de diffraction successifs dans la figure de diffraction de Fraunhofer d'un reseau a 1 dimension, lorsque la lentille, qui effectue la transformation de Fourier a 2 dimensions, est immergee dans differents liquides a l'interieur d'une cellule en verre