Toward an interferometer at Dome C, Antarctica: measurement of the atmospheric coherence time

Details Toward an interferometer at Dome C, Antarctica: measurement of the atmospheric coherence time Toward an interferometer at Dome C, Antarctica: measurement of the atmospheric coherence time

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6522e..16k&link_type=abstract

Thirteenth Joint International Symposium on Atmospheric and Ocean Optics/ Atmospheric Physics. Edited by Matvienko, Gennadii G.;

Physics

Optics

Scientific paper

Dome C, a summit on the Antarctic Ice Sheet, is a potential site for a projected astronomical interferometer. Measurements of the atmospheric time constant , τ0 - which characterizes the performance of ground-based interferometers - have been performed on January 31st and February 1st 2005 at daytime. The atmospheric time constant was assessed through the motion of the image formed in the focal plane of a Fizeau interferometer. Insufficient temporal and spatial samplings did not permit the direct determination of τ0, but a lower limit was, nevertheless, obtained by studying the decay rate of the correlation between successive fringes. Coherence times were found to exceed 10 ms, i.e. they are at least three times larger than the median coherence time measured at the site of Paranal (3.3ms). The instrumental set-up used at DomeC is sensitive to the wind direction and this intrinsically limits the precision that can be reached in the determination of τ0. We review other current techniques for measuring the atmospheric time constant, and show that an adequate technique to monitor τ0 is still lacking. A new method based on the fast variations of defocus is outlined.

Affiliated with

Also associated with

No associations

Rating

Toward an interferometer at Dome C, Antarctica: measurement of the atmospheric coherence time does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Toward an interferometer at Dome C, Antarctica: measurement of the atmospheric coherence time, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Toward an interferometer at Dome C, Antarctica: measurement of the atmospheric coherence time will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1346333