Altération du facteur de visibilité par diffraction de Fresnel en synthèse d'ouverture.

Details Altération du facteur de visibilité par diffraction de Fresnel en synthèse d'ouverture. Altération du facteur de visibilité par diffraction de Fresnel en synthèse d'ouverture.

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jopt...20..131m&link_type=abstract

Journal of Optics (Paris), Vol. 20, No. 3, p. 131 - 140

Physics

Optics

3

Aperture Synthesis

Scientific paper

Aperture synthesis in the visible or in the infrared requires exact superposition of waves coming from two different telescopes. If the superposition is not perfect, the Fresnel's diffraction introduces some degradation which involves an attenuation of fringes contrast. This attenuation is eventually negligible in the visible but reaches a value of 20 to 30% in the intrared. It's a very important phenomenon which one should not ignore if one wants to estimate the fringe visibility better than 10%. The authors give an analytical expression of this diminuation in order to correct measurements.

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