Dome Induced Image Motion

Fred Forbes

doi:10.1117/12.933519

4 November 1982 Dome Induced Image Motion

Fred Forbes

Proceedings Volume 0332, Advanced Technology Optical Telescopes I; (1982) https://doi.org/10.1117/12.933519
Event: 1982 Astronomy Conferences, 1982, Tucson, United States

Abstract

"Local seeing" effects degrade image quality with conventional impaired performance of mirror alignment systems. Essential to the design of advanced technology telescopes such as the National New Technology Telescope (NNTT) is a knowledge of these dome-induced image motion effects. Characterization of the turbulent, small scale thermal disturbances had been achieved with differential microthermal sensors able to detect millidegree centigrade thermal gradients with a bandwidth of 100 Hertz. Image degradation associated with dome microthermal activity is shown for sub-arcsecond images. Thermal spectra prepared with Fourier transforms from 0.02 to 65 Hertz show increases in thermal activity as the dome is opened. Relative motion of star pairs as a function of field separation is studied using a CID camera system. Light intensity profiles and centroids are recorded along an axis passing through the two separated stars. The relative motion for the binary star γ Andromeda is presented as image motion correlation spectra from .03 to 15 Hertz.

Citation Download Citation

Fred Forbes "Dome Induced Image Motion", Proc. SPIE 0332, Advanced Technology Optical Telescopes I, (4 November 1982); https://doi.org/10.1117/12.933519

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