INVESTIGADORES
TEBALDI Myrian Cristina
artículos
Título:
Moire beating digital technique to collimation testing
Autor/es:
ROBERTO TORROBA; NESTOR BOLOGNINI; MYRIAN TEBALDI; ALBERTO TAGLIAFERRI
Revista:
OPTICS COMMUNICATIONS
Editorial:
Elsevier Science
Referencias:
Lugar: Amsterdam (The Netherlands); Año: 2002 vol. 201 p. 283 - 288
ISSN:
0030-4018
Resumen:
A digital collimation technique based on the self-imaging phenomenon is proposed. Basically, a moire pattern is observed byviewing the Fresnel image of an original self-imaged grating through a second grating. Decollimation of the laser beam causes a variation in the self-image period. In our method, the moire beating is produced through a digital subtraction operation of a replica of the original grating and the self-images provided bya decollimated beam. The variation of the moire period is related to the amount of decollimation of the illuminating beam. Lenses of different focal lengths were used in the collimation procedure, as well as gratings with different periods. The validity of the approach is experimentallyd emonstrated and setting sensitivities are compared.
