Fine-resolution imaging of solar features using Phase-Diverse Speckle

Details Fine-resolution imaging of solar features using Phase-Diverse Speckle Fine-resolution imaging of solar features using Phase-Diverse Speckle

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995stin...9621275p&link_type=abstract

Technical Report, Environmental Research Inst. of Michigan Ann Arbor, MI United States

Computer Science

Atmospheric Turbulence, Imaging Techniques, Atmospheric Correction, Speckle Patterns, Optical Correction Procedure, Image Reconstruction, Solar Observatories, Phase Error, Charge Coupled Devices, Defocusing, Instrument Errors, Space Observations (From Earth), Aberration, Misalignment, Telescopes

Scientific paper

Phase-diverse speckle (PDS) is a novel imaging technique intended to overcome the degrading effects of atmospheric turbulence on fine-resolution imaging. As its name suggests, PDS is a blend of phase-diversity and speckle-imaging concepts. PDS reconstructions on solar data were validated by simulation, by demonstrating internal consistency of PDS estimates, and by comparing PDS reconstructions with those produced from well accepted speckle-imaging processing. Several sources of error in data collected with the Swedish Vacuum Solar Telescope (SVST) were simulated misalignment, and defocus error, as well as atmospheric turbulence model error. The simulations demonstrate that fine-resolution information can be reliably recovered out to at least 70% of the diffraction limit without significant introduction of image artifacts. Additional confidence in the SVST restoration is obtained by comparing its spatial power spectrum with previously-published power spectra derived from both space-based images and earth-based images corrected with traditional speckle-imaging techniques; the shape of the spectrum is found to match well the previous measurements. In addition, the imagery is found to be consistent with, but slightly sharper than, imagery reconstructed with accepted speckle-imaging techniques.

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