
Proceedings Paper
MAM testbed data analysis: cyclic averagingFormat | Member Price | Non-Member Price |
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Paper Abstract
The micro-arcsecond metrology testbed (MAM) provides a testing ground
for SIM to perform optical path difference measurements with picometer
(pm) precision. Because of imperfect optics and non-ideal laser
sources it is inevitable that the cyclic bias is one of the major
error sources for SIM. Many experiments have been conducted to
diagnose and to characterize cyclic bias in the laser gauges, and in
white light fringe detection. Our data analysis indicates that cyclic
bias in MAM has a predictable frequency and a relatively stable
amplitude. It has been proposed to use phase measurements at different
wavelengths to solve for the cyclic bias. The experiment results have
shown that the cyclic bias in SAVV are reduced from nm level to the level of hundred picometers. Besides the cyclic bias the effective
wavelengths of spectral channels have to be calibrated also. At
present, a new method using FFT technique and new metrology gauge
demonstrates that the wavelength determination has a precision of
10-4. The spectrometer in MAM is stable. The changes of
effective wavelengths in a few weeks is about one nanometer, or
less. Systematic biases above must be periodically calibrated.
Paper Details
Date Published: 26 February 2003
PDF: 11 pages
Proc. SPIE 4852, Interferometry in Space, (26 February 2003); doi: 10.1117/12.460723
Published in SPIE Proceedings Vol. 4852:
Interferometry in Space
Michael Shao, Editor(s)
PDF: 11 pages
Proc. SPIE 4852, Interferometry in Space, (26 February 2003); doi: 10.1117/12.460723
Show Author Affiliations
Michael Shao, Jet Propulsion Lab. (United States)
Published in SPIE Proceedings Vol. 4852:
Interferometry in Space
Michael Shao, Editor(s)
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