Speckle masking, speckle spectroscopy and optical aperture synthesis.
Abstract
Speckle masking is a solution of the phase problem in speckle interferometry. Therefore, diffraction-limited images can be reconstructed by speckle masking in spite of image degradation by the atmosphere and telescope aberrations. Speckle masking observations with one of the 8-m telscopes of the ESO-VLT can yield high-resolution images with 0.01arcsec resolution. The limiting magnitude of speckle interferometry and of speckle masking is about 20m. Speckle spectroscopy is a speckle method that yields diffraction-limited objective prism spectra. The coherent combination of the 4 beams of the 4 VLT telescopes yields long-baseline speckle interferograms. The authors show by digital simulation that images with 0.001arcsec resolution can be reconstructed from VLT long-baseline interferograms by speckle masking. They compare the 25 m-25 m-25 m redundant array with the 25 m-75 m-50 m nonredundant array. The 25 m-25 m-25 m redundant array yields much higher SNR.
- Publication:
-
European Southern Observatory Conference and Workshop Proceedings
- Pub Date:
- 1986
- Bibcode:
- 1986ESOC...24..289W
- Keywords:
-
- Image Reconstruction;
- Masking;
- Speckle Interferometry;
- Synthetic Apertures;
- Telescopes;
- Visible Spectrum;
- Hydrogen Clouds;
- Imaging Techniques;
- Spectral Resolution;
- Very Large Array (Vla);
- Instrumentation and Photography;
- Image Restoration:Speckle Interferometry;
- Speckle Interferometry:Image Restoration