Alignment of the Cassegrain and Coude optics of the 3.8m UK infrared telescope; assessment of the optical performance and results of aberration calculations

Details Alignment of the Cassegrain and Coude optics of the 3.8m UK infrared telescope; assessment of the optical performance and results of aberration calculations Alignment of the Cassegrain and Coude optics of the 3.8m UK infrared telescope; assessment of the optical performance and results of aberration calculations

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8213024b&link_type=abstract

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Physics

Optics

Aberration, Alignment, Cassegrain Optics, Infrared Telescopes, Optical Properties, Astigmatism, Focal Plane Devices, Fresnel Reflectors, Image Resolution, Optical Correction Procedure, Prefocusing

Scientific paper

The alignment procedures used for the f/9 and f/20 systems of the United Kingdom infrared telescope (UKIRT) are described. For the f/9 system, the primary mirror was positioned radially so that it was centered in the mirror cell by equalizing the combined signals from opposite pairs of the load cells incorporated in the mirror cell. An alignment telescope (AT) was mounted on a flange bolted to the rotatable instrument flange of UKIRT. An alignment fixture was positioned so as to provide an accurate ground surface on which the AT bullseye target reflector could be mounted. Improved performance resulted when the AT was replaced by a Hartmann camera with eyepiece and graticule. Spherical aberration is introduced into the image when the focal plane is displaced axially from the optimum position. Coma results, primarily from misalignment of the primary and secondary mirrors. Astigmation of 0.232 arc sec, are reported for the primary mirror.

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