Calibration and alignment of metrology system for the Nuclear Spectroscopic Telescope Array mission

Creators: Liebe, Carl Christian; Craig, William; Kim, Yunjin; McLean, Ryan; Meras, Patrick, Jr.; Raffanti, Michael; Scholz, Christopher

Abstract

A metrology system to measure the on-orbit movement of a ten meter mast has been built for the Nuclear Spectroscopic Telescope Array (NuSTAR) x-ray observatory. In this paper, the metrology system is described, and the performance is measured. The laser beam stability is discussed in detail. Pre-launch alignment and calibration are also described. The invisible infrared laser beams must be aligned to their corresponding detectors without deploying the telescope in Earth's gravity. Finally, a possible method for in-flight calibration of the metrology system is described.

Additional Information

© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). Paper 111097 received Sep 08, 2011; Accepted Feb 10, 2012; Revised Feb 08, 2012; Published online Apr 16, 2012. The research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, Space Radiation Laboratory, California Institute of Technology and Space Sciences Laboratory, U.C. Berkeley and was sponsored by the National Aeronautics and Space Administration. References herein to any specific commercial product, process or service by trademark, manufacturer, or otherwise, does not constitute or imply its endorsement by the United States Government or the Jet Propulsion Laboratory, California Institute of Technology, Space Radiation Laboratory, California Institute of Technology or Space Sciences Laboratory, U.C. Berkeley.

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