Robust determination of optical path difference: fringe tracking at the infrared optical telescope array interferometer
We describe the fringe-packet tracking system used to equalize the optical path lengths at the Infrared Optical Telescope Array interferometer. The measurement of closure phases requires obtaining fringes on three baselines simultaneously. This is accomplished by use of an algorithm based on double...
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| Veröffentlicht in: | Applied Optics 2005-09, Vol.44 (25), p.5173-5179 |
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| container_issue | 25 |
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| container_title | Applied Optics |
| container_volume | 44 |
| creator | Pedretti, Ettore Traub, Wesley A Monnier, John D Millan-Gabet, Rafael Carleton, Nathaniel P Schloerb, F Peter Brewer, Michael K Berger, Jean-Philippe Lacasse, Marc G Ragland, Sam |
| description | We describe the fringe-packet tracking system used to equalize the optical path lengths at the Infrared Optical Telescope Array interferometer. The measurement of closure phases requires obtaining fringes on three baselines simultaneously. This is accomplished by use of an algorithm based on double Fourier interferometry for obtaining the wavelength-dependent phase of the fringes and a group-delay tracking algorithm for determining the position of the fringe packet. A comparison of data acquired with and without the fringe-packet tracker shows a factor of approximately 3 reduction of the error in the closure-phase measurement. The fringe-packet tracker has been able so far to track fringes with signal-to-noise ratios as low as 1.8 for stars as faint as mH = 7.0. |
| doi_str_mv | 10.1364/AO.44.005173 |
| format | Article |
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The measurement of closure phases requires obtaining fringes on three baselines simultaneously. This is accomplished by use of an algorithm based on double Fourier interferometry for obtaining the wavelength-dependent phase of the fringes and a group-delay tracking algorithm for determining the position of the fringe packet. A comparison of data acquired with and without the fringe-packet tracker shows a factor of approximately 3 reduction of the error in the closure-phase measurement. 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The measurement of closure phases requires obtaining fringes on three baselines simultaneously. This is accomplished by use of an algorithm based on double Fourier interferometry for obtaining the wavelength-dependent phase of the fringes and a group-delay tracking algorithm for determining the position of the fringe packet. A comparison of data acquired with and without the fringe-packet tracker shows a factor of approximately 3 reduction of the error in the closure-phase measurement. The fringe-packet tracker has been able so far to track fringes with signal-to-noise ratios as low as 1.8 for stars as faint as mH = 7.0.</abstract><cop>United States</cop><pub>Optical Society of America</pub><pmid>16149339</pmid><doi>10.1364/AO.44.005173</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0001-5025-0428</orcidid><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | Alma/SFX Local Collection; Optica Publishing Group Journals |
| subjects | ALGORITHMS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS CLOSURES COMPARATIVE EVALUATIONS ERRORS INTERFEROMETERS INTERFEROMETRY SIGNAL-TO-NOISE RATIO TELESCOPES VISIBLE RADIATION |
| title | Robust determination of optical path difference: fringe tracking at the infrared optical telescope array interferometer |
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