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

Berger, David H. and Monnier, John D. and Millan-Gabet, Rafael and ten Brummelaar, Theo A. and Muirhead, Philip and Pedretti, Ettore and Thureau, Nathalie (2006) CHARA Michigan phase-tracker (CHAMP): design and fabrication. In: Advances in Stellar Interferometry. Proceedings of SPIE. No.6268. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 62683K. ISBN 9780819463333. http://resolver.caltech.edu/CaltechAUTHORS:20190715-105838188

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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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.672168DOIArticle
ORCID:
AuthorORCID
Monnier, John D.0000-0002-3380-3307
Millan-Gabet, Rafael0000-0003-0447-5866
ten Brummelaar, Theo A.0000-0002-0114-7915
Muirhead, Philip0000-0002-0638-8822
Additional Information:© 2006 Society of Photo-Optical Instrumentation Engineers (SPIE). The fringe tracker funding, including financial support for DHB, was provided by the National Science Foundation through grant AST-0352723.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NSFAST-0352723
Subject Keywords:fringe tracking, long baseline optical interferometry
Record Number:CaltechAUTHORS:20190715-105838188
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190715-105838188
Official Citation:David H. Berger, John D. Monnier, Rafael Millan-Gabet, Theo A. ten Brummelaar, Philip Muirhead, Ettore Pedretti, and Nathalie Thureau "CHARA Michigan phase-tracker (CHAMP): design and fabrication", Proc. SPIE 6268, Advances in Stellar Interferometry, 62683K (28 June 2006); https://doi.org/10.1117/12.672168
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97147
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Jul 2019 18:07
Last Modified:15 Jul 2019 18:07

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