Absolute metrology for the Kite testbed

Details Absolute metrology for the Kite testbed Absolute metrology for the Kite testbed

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4852..336m&link_type=abstract

Interferometry in Space. Edited by Shao, Michael. Proceedings of the SPIE, Volume 4852, pp. 336-346 (2003).

Physics

Scientific paper

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.

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