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SIM Narrow and wide angle astrometric demonstration on the MAM testbed.

Show simple item record Goullioud, Renaud Shen, Tsae-Pyng J. Catanzarite, Joseph H. 2006-04-12T18:42:55Z 2006-04-12T18:42:55Z 2004-06-22
dc.identifier.citation 2004 Earth Science Technology Conference, Palo Alto, California, June 22, 2004. en
dc.identifier.clearanceno 04-1629
dc.description.abstract The Space Interferometry Mission (SIM) requires fringe measurements to the level of picometers in order to produce astrometric data at the micro-arc-second level. To be more specific, it is necessary to measure both the position of the starlight central fringe and the change in the internal optical path of the interferometer to tens of picometers. The internal path is measured with a small heterodyne metrology beam, whereas the starlight fringe position is estimated with a CCD sampling a large concentric annular beam. One major challenge for SIM is to align the metrology beam with the starlight beam to keep the consistency between these two sensors at the system level while articulating the instrument optics over the field of regard. The Micro-Arcsecond Metrology testbed (MAM), developed at the Jet Propulsion Laboratory, features an optical interferometer with a white light source, all major optical components of a stellar interferometer and heterodyne metrology sensors. The setup is installed inside a large vacuum chamber in order to mitigate the atmospheric and thermal disturbances. Astrometric observations are simulated by articulating the optics over the 15 degrees field of regard to generate multiple artificial stars. Recent data show agreement between the metrology and starlight paths to 20pm in the narrow angle field and to 350pm in the full wide angle field of regard of SIM. This paper describes the MAM optical setup, the observation process, the current data and how the performance relates to SIM. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 1019787 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004. en
dc.subject interometry en
dc.subject Space Interferometry Mission (SIM) en
dc.subject metrology en
dc.title SIM Narrow and wide angle astrometric demonstration on the MAM testbed. en
dc.type Preprint en

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