Halo measurement using phase-sorting interferometry

Johanan L. Codona, Matthew Kenworthy, Michael Hart

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Imperfections, misalignments, aberrations, and even dust can significantly limit sensitivity in high-contrast imaging systems such as coronagraphs. An upstream deformable mirror (DM) can be used to correct or compensate for these flaws. To include non-common-path errors introduced after the an AO system closed loop, correcting measurements must be made with the science camera. Measurement of the phase and amplitude of a star's halo is sufficient to compute a compensating pupil DM shape that suppresses the scattered halo. Phase-Sorting Interferometry (PSI) is a technique that uses AO residual starlight speckles and wavefront sensor measurements to estimate the complex halo. We have demonstrated PSI on-sky at the 6.5m MMTO telescope using mid-IR L and M-band images.

Original languageEnglish (US)
Title of host publicationFourier Transform Spectroscopy, FTS 2011
StatePublished - 2011
EventFourier Transform Spectroscopy, FTS 2011 - Toronto, Canada
Duration: Jul 10 2011Jul 14 2011

Publication series

NameOptics InfoBase Conference Papers
ISSN (Electronic)2162-2701


OtherFourier Transform Spectroscopy, FTS 2011

ASJC Scopus subject areas

  • Instrumentation
  • Atomic and Molecular Physics, and Optics


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