Computer Science – Performance
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2200..195g&link_type=abstract
Proc. SPIE Vol. 2200, p. 195-203, Amplitude and Intensity Spatial Interferometry II, James B. Breckinridge; Ed.
Computer Science
Performance
2
Scientific paper
In the framework of the development of the Very Large Telescope Interferometer (VLTI) by the European Southern Observatory (ESO) we have proposed the LAMP (Large Amplitude Modulated Path). The sensor is that part of the fringe-tracker which only provides a set of error signals reflecting Optical Path Differences (OPD) at a common focus, between collected fields, the so-called piston effect. LAMP relies on both temporal encoding of OPD on each pair of apertures and on an appropriate spatial encoding which allows simultaneous operation on several apertures. Besides, it has been designed so as to provide at the same time both coherencing error signals and cophasing error signals (these latter when allowed by the source's brightness). Such ability is based on the large amplitude used in the modulation. In this paper, after a short presentation of both initial working conditions and specific capabilities that have driven the design, we describe the principle of LAMP. We also describe a generic setup and we report performances in terms of OPD resolution (minimum detectable piston), response-time and limiting magnitude. Finally advantages and drawbacks of the design are discussed.
Gay Jean
Rabbia Yves
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