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Proceedings Paper

Absolute metrology for the Kite testbed
Author(s): James E. Mason
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Paper Abstract

The Kite testbed at JPL is being developed to demonstrate relative metrology on a four-cornered metrology truss with six gauges to 10's of picometers. The solution to the truss equation requires accurate knowledge of the direction cosines between the fiducials, which is derived from the absolute distances that the gauges measure. The absolute distance accuracy is required at better than 10μm in order for relative metrology to measure picometer accuracy. In this paper, a technique called switched heterodyne interferometry is described and implemented. The implementation is in a calibration testbed which is used to develop the hardware and software to perform this technique, as well as to calibrate the interferometric beamlaunchers which are part of the metrology gauges. Some early tests were successful, but recent tests have had more noise in the measurement than acceptable. The reasons for this are under investigation.

Paper Details

Date Published: 26 February 2003
PDF: 11 pages
Proc. SPIE 4852, Interferometry in Space, (26 February 2003); doi: 10.1117/12.460941
Show Author Affiliations
James E. Mason, Lockheed Martin Advanced Technology Ctr. (United States)

Published in SPIE Proceedings Vol. 4852:
Interferometry in Space
Michael Shao, Editor(s)

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