Measurements of the isoplanatic angle of image motion for angular separations up to 10 arcmin

Details Measurements of the isoplanatic angle of image motion for angular separations up to 10 arcmin Measurements of the isoplanatic angle of image motion for angular separations up to 10 arcmin

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2199..969n&link_type=abstract

Proc. SPIE Vol. 2199, p. 969-976, Advanced Technology Optical Telescopes V, Larry M. Stepp; Ed.

Physics

Scientific paper

Star trails have been taken with a CCD-camera covering a field of approximately 10'. With the telescope movement stopped the sampling rate was of the order of 40 Hz. The correlations between the centroid variations of different trails, representing the image motion perpendicular to the trails, have been calculated. The power spectra of the centroid motions are used to identify their origin. The method turns out to be feasible for the measurement of the isoplanatic angle of image motion. The results show that the correlations of the image motions can be significantly enhanced, if the time delay due to the movement of the turbulence across the field of the telescope is taken into account.

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