Translator Disclaimer
20 October 2004 Metrology and pointing for astronomical interferometers
Author Affiliations +
Metrology and pointing will be enabling technologies for a new generation of astronomical missions having large and distributed apertures and delivering unprecedented performance. The UV interferometer Stellar Imager would study stellar dynamos by imaging magnetic activity on the disks of stars in our Galaxy. The X-ray interferometer Black Hole Imager would study strong gravity physics and the formation of jets by imaging the event horizons of supermassive black holes. These missions require pointing to microarcseconds or better, and metrology to nm accuracy of optical elements separated by km, for control of optical path difference. This paper describes a metrology and pointing system that meets these requirements for the Stellar Imager. A reference platform uses interferometers to sense alignment with a guide star. Laser gauges determine mirror positions in the frame of the reference platform, and detector position is monitored by laser gauges or observations of an artificial star. Applications to other astronomical instruments are discussed.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James D. Phillips, Kenneth G. Carpenter, Keith C. Gendreau, Margarita Karovska, Philip E. Kaaret, and Robert D. Reasenberg "Metrology and pointing for astronomical interferometers", Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004);


POINTS: A Small Astrometric Interferometer In Space
Proceedings of SPIE (February 21 1986)
Cryogenic Star-Tracking Telescope For Gravity Probe B
Proceedings of SPIE (July 18 1986)
Results of the Guide 2 telescope testbed for the SIM...
Proceedings of SPIE (July 21 2010)
MAXIM x-ray interferometry mission
Proceedings of SPIE (January 29 2004)
Overview of the SIM PlanetQuest Light mission concept
Proceedings of SPIE (July 28 2008)

Back to Top