Optical long-baseline interferometry - Signal-to-noise ratio of image reconstruction by optical phase-closure imaging and by speckle masking

Details Optical long-baseline interferometry - Signal-to-noise ratio of image reconstruction by optical phase-closure imaging and by speckle masking Optical long-baseline interferometry - Signal-to-noise ratio of image reconstruction by optical phase-closure imaging and by speckle masking

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apopt..27.1943h&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 27, May 15, 1988, p. 1943-1951. DFG-supported research.

Physics

Optics

1

Image Reconstruction, Signal To Noise Ratios, Speckle Interferometry, Very Long Base Interferometry, Angular Resolution, Diffraction Limited Cameras, Mirrors, Speckle Patterns

Scientific paper

Optical multiple-mirror interferometers in space can yield fascinating angular resolution. For example, at λ ≡ 100 nm and with an interferometer diameter of 20 m, a resolution of 0.001 sec of arc can be obtained. From the speckle interferograms recorded with ground-based interferometers or space interferometers, diffraction-limited images can be reconstructed by various methods. In this paper the signal-to-noise ratio of the two image reconstruction methods, optical phase-closure imaging and speckle masking (triple correlation), are investigated. The results show that (1) phase-closure imaging yields images with higher signal-to-noise ratio than speckle masking for bright objects and (2) speckle masking yields images with higher signal-to-noise ratio than phase-closure imaging for faint objects.

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