CHARA Michigan phase-tracker (CHAMP): design and fabrication

D.~H. Berger, J.~D. Monnier, R. Millan-Gabet, T.~A. ten Brummelaar, P. Muirhead, E. Pedretti, N. Thureau

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Citations (Scopus)

Abstract

We present the design for a near-infrared (JHK) fringe tracker to be used at the CHARA Array, a long baseline optical interferometer located at Mount Wilson Observatory. The CHARA Michigan Phase-tracker (CHAMP) is being fabricated and tested at the University of Michigan and will be transported to the CHARA Array for general use. CHAMP is separate from the science combiners and can therefore be optimized for fringe tracking. It will modulate around fringe center by 1-2λ at up to 500 Hz and calculate phase offsets in real-time using a modified 'ABCD' method . Six pair-wise Mach-Zehnder combiners will phase the entire Array. We give an overview of the optical layout and discuss our design strategy. Components such as the path-length modulators, low-OH fiber transport system, 1024x1024 HAWAII-1 detector, and control computer are discussed.
Original languageUndefined/Unknown
Title of host publicationSociety of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
Pages3
Number of pages1
Volume6268
DOIs
Publication statusPublished - 28 Jun 2006

Publication series

NameSociety of Photo-Optical Instrumentation Engineers (SPIE) Conference Series

Cite this

Berger, D. H., Monnier, J. D., Millan-Gabet, R., ten Brummelaar, T. A., Muirhead, P., Pedretti, E., & Thureau, N. (2006). CHARA Michigan phase-tracker (CHAMP): design and fabrication. In Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (Vol. 6268, pp. 3). (Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series). https://doi.org/10.1117/12.672168