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Mitigation of Angle Tracking Errors Due to Color Dependent Centroid Shifts in SIM-LiteThe SIM-Lite astrometric interferometer will search for Earth-size planets in the habitable zones of nearby stars. In this search the interferometer will monitor the astrometric position of candidate stars relative to nearby reference stars over the course of a 5 year mission. The elemental measurement is the angle between a target star and a reference star. This is a two-step process, in which the interferometer will each time need to use its controllable optics to align the starlight in the two arms with each other and with the metrology beams. The sensor for this alignment is an angle tracking CCD camera. Various constraints in the design of the camera subject it to systematic alignment errors when observing a star of one spectrum compared with a start of a different spectrum. This effect is called a Color Dependent Centroid Shift (CDCS) and has been studied extensively with SIM-Lite's SCDU testbed. Here we describe results from the simulation and testing of this error in the SCDU testbed, as well as effective ways that it can be reduced to acceptable levels.
Document ID
20150008516
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Nemati, Bijan
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
An, Xin
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Goullioud, Renaud
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Shao, Michael
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Shen, Tsae-Pyng
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wehmeier, Udo J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Weilert, Mark A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wang, Xu
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Werne, Thomas A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wu, Janet P.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Zhai, Chengxing
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
May 20, 2015
Publication Date
June 27, 2010
Subject Category
Astronomy
Optics
Meeting Information
Meeting: SPIE Astronomical Telescopes and Instrumentation 2010 Conference
Location: San Diego, CA
Country: United States
Start Date: June 27, 2010
End Date: July 2, 2010
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Other
Keywords
Spectral
interferometry
Astrometry

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