TY - JOUR
T1 - CHARA Michigan phase-tracker (CHAMP): design and fabrication
AU - Berger, David H.
AU - Monnier, John D.
AU - Millan-Gabet, Rafael
AU - ten Brummelaar, Theo A.
AU - Muirhead, Philip
AU - Pedretti, Ettore
AU - Thureau, Nathalie
PY - 2006/7/1
Y1 - 2006/7/1
N2 - 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 1-2¿ 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.
AB - 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 1-2¿ 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.
M3 - Article
VL - 6268
SP - 113
JO - Advances in Stellar Interferometry
JF - Advances in Stellar Interferometry
ER -