Computer Science – Performance
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3350..116g&link_type=abstract
Proc. SPIE Vol. 3350, p. 116-127, Astronomical Interferometry, Robert D. Reasenberg; Ed.
Computer Science
Performance
2
Scientific paper
We review the formalism for white light fringes in Michelson interferometers. For astronomical use, these instruments are typically limited in sensitivity by photon statistics. Thus we investigate by simulation an alternate approach to fringe detection which utilizes an optimal filter approach. This is compared to a highly successful method presently used in many such systems, based on quadrature fringe amplitude. It is found that the optical filter approach yields an improved sensitivity of between 0.3 and 0.8 visual stellar magnitudes. We also consider the possibility of using such an approach to search over trial values of fringe drift rate, corresponding to linear motion of the fringe. We find that a very significant improvement in performance is possible for system that utilize searches over both delay and delay rate.
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