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Proceedings Paper

Fringe modulation for an MROI beam combiner
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Paper Abstract

We report on the testing of the modulators within the MROI fringe tracking beam combiner. Modulation in the beam combiner will be performed via modulators introducing an optical path difference in increments of λ/4 into the beams. Knowledge of the path difference introduced needs to be accurate to within 1!. To achieve this accuracy, the modulators are characterized and the desired step waveform optimized through a Fourier analysis technique. Control is implemented in an FPGA embedded system and performance will be monitored by means of a slow loop Fourier algorithm. Details of the progress on characterization, optimization and future implementation are presented here.

Paper Details

Date Published: 22 July 2010
PDF: 7 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 77343V (22 July 2010); doi: 10.1117/12.857295
Show Author Affiliations
T. M. McCracken, New Mexico Institute of Mining and Technology (United States)
C. A. Jurgenson, New Mexico Institute of Mining and Technology (United States)
D. H. Baird, David Baird Embedded Systems (United States)
J. K. Seamons, New Mexico Institute of Mining and Technology (United States)
K. M. McCord, New Mexico Institute of Mining and Technology (United States)
D. F. Buscher, Univ. of Cambridge (United Kingdom)
C. A. Haniff, Univ. of Cambridge (United Kingdom)
J. S. Young, Univ. of Cambridge (United Kingdom)


Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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