Performances of an Actively Stabilized Stellar Interferometer (ASSI): Faint magnitudes, low fringe contrast measurements and operationality

Details Performances of an Actively Stabilized Stellar Interferometer (ASSI): Faint magnitudes, low fringe contrast measurements and operationality Performances of an Actively Stabilized Stellar Interferometer (ASSI): Faint magnitudes, low fringe contrast measurements and operationality

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.273..205d&link_type=abstract

In ESA, ESA Workshop on Optical Interferometry in Space p 205-215 (SEE N88-10613 01-74)

Physics

Optics

Adaptive Optics, Diffraction Patterns, Image Contrast, Michelson Interferometers, Stabilization, Calibrating, Stellar Magnitude, Stellar Radiation

Scientific paper

Long baseline Michelson interferometry using a real time active stabilization of the central fringe position (fringe tracking) is described. The monitoring function (star pointing and optical path delay information) is clearly dissociated (and flux optimized) from the scientific analysis function, in which time integration and stability are favored for reasons of precision on the fringe contrast measurement. The driving concept of the instrumental design is the optimization of the received stellar flux for stabilization (on a white or achromatic unique fringe) and the use of narrow spectral bands for analysis. This stabilized spectrointerferometry method provides accurate measurements of low visibility (i.e., less than or = 1%) fringes together with access to faint magnitudes. Performances are found to be largely improved in comparison to classical stellar interferometry.

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