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Proceedings Paper

Absolute distance metrology for space interferometers
Author(s): Bas L. Swinkels; Nandini Bhattacharya; Arno A. Wielders; Joseph J. M. Braat
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Paper Abstract

Future space missions, among which the Darwin Space Interferometer, will consist of several free flying satellites. A complex metrology system is required to have all the components fly accurately in formation and have it operate as a single instrument. Our work focuses on a possible implementation of the sub-system that measures the absolute distance between two satellites with high accuracy. For Darwin the required accuracy is on the order of 70 micrometer over a distance of 250 meter. We are exploring a technique called frequency sweeping interferometry, which involves interferometrically measuring a phase difference while sweeping the wavelength of a tunable laser. This phase difference is directly proportional to the absolute distance. A very high finesse Fabry-Perot cavity is used as a reference standard, to which the laser is locked end-points of the sweep. We will discuss the control system that drives the setup and show some first experimental results.

Paper Details

Date Published: 13 June 2005
PDF: 6 pages
Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005); doi: 10.1117/12.612568
Show Author Affiliations
Bas L. Swinkels, Delft Univ. of Technology (Netherlands)
Nandini Bhattacharya, Delft Univ. of Technology (Netherlands)
Arno A. Wielders, TNO-TPD (Netherlands)
Joseph J. M. Braat, Delft Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 5856:
Optical Measurement Systems for Industrial Inspection IV
Wolfgang Osten; Christophe Gorecki; Erik L. Novak, Editor(s)

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