Halftoning for High-contrast Imaging: Developments for the SPHERE and EPICS Instruments

Details Halftoning for High-contrast Imaging: Developments for the SPHERE and EPICS Instruments Halftoning for High-contrast Imaging: Developments for the SPHERE and EPICS Instruments

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009msngr.137...18m&link_type=abstract

The Messenger, vol. 137, p. 18-23

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Controlling the amplitude of light is crucial for many scientific applications, such as in imaging systems, astronomical instruments or laser physics. We provide a brief overview of recent R&D activities at ESO using halftoning, the process of presenting a continuous image through use of dots. Customised filters with spatially varying transmission are produced using a binary array of metal pixels that offers excellent control of the local transmission. Applications to the production of an apodiser for the VLT SPHERE instrument and a mask for E-ELT EPICS are presented.

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