Open AccessImprovements for group delay fringe tracking
Author(s) -
Basden A. G.,
Buscher D. F.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2005.08681.x
Subject(s) - physics , astronomical interferometer , tracking (education) , optical path length , group delay and phase delay , optics , dispersion (optics) , optical path , path (computing) , modulation (music) , sampling (signal processing) , ideal (ethics) , phase (matter) , interferometry , telecommunications , acoustics , computer science , detector , bandwidth (computing) , philosophy , epistemology , psychology , pedagogy , quantum mechanics , programming language
Group delay fringe tracking using spectrally dispersed fringes is suitable for stabilizing the optical path difference in ground‐based astronomical optical interferometers in low light level situations. We discuss the performance of group delay tracking algorithms when the effects of atmospheric dispersion, high‐frequency atmospheric temporal phase variations, non‐ideal path modulation, non‐ideal spectral sampling, and the detection artifacts introduced by electron‐multiplying CCDs are taken into account, and we present ways in which the tracking capability can be optimized in the presence of these effects.