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Proceedings Paper

Micro-arcsecond metrology (MAM) testbed overview
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Paper Abstract

One of the most critical technology requirements for the Space Interferometry Mission is that the difference in pathlength traveled by the starlight through each arm of the instrument be known with picometers of precision. SIM accomplishes this by using an internal laser metrology system to measure the optical path traveled by the starlight. The SIM technology program has previously demonstrated laser gauges with measurement accuracy below 10 picometers. The next challenge is to integrate one of these gauges into a full interferometer system and demonstrate that the system still operates at the required level. For SIM, the ultimate requirement is that the internal metrology system be able to give an accurate measure of the starlight internal path difference to about 150 picometers over its narrow-angle field, with a goal of 50 picometer accuracy. This accuracy must be maintained even as SIM's various active systems articulate the SIM optics and vary the SIM internal pathlengths. The Microarcsecond Metrology Testbed (MAM) is a full single-baseline interferometer coupled with a precision pseudostar, intended to demonstrate the level of agreement between starlight and metrology phase measurements needed to make microarcsecond-level measurements of stellar positions. MAM has been under development for several years and is now producing picometers-level consistency that translates into microarcseconds-level performance. This paper will present an overview of the MAM Testbed, together with recent results targeting the 150 picometer performance level required by SIM.

Paper Details

Date Published: 26 February 2003
PDF: 12 pages
Proc. SPIE 4852, Interferometry in Space, (26 February 2003); doi: 10.1117/12.460919
Show Author Affiliations
Braden E. Hines, Jet Propulsion Lab. (United States)
Charles E. Bell, Jet Propulsion Lab. (United States)
Renaud Goullioud, Jet Propulsion Lab. (United States)
Robert Spero, Jet Propulsion Lab. (United States)
Gregory W. Neat, Jet Propulsion Lab. (United States)
TsePyng Janice Shen, Jet Propulsion Lab. (United States)
Eric E. Bloemhof, Jet Propulsion Lab. (United States)
Michael Shao, Jet Propulsion Lab. (United States)
Joseph Catanzarite, Jet Propulsion Lab. (United States)
Martin W. Regehr, Jet Propulsion Lab. (United States)
R. Machuzak, Jet Propulsion Lab. (United States)

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

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