Surface adjustment of the KOSMA 3m telescope using phase retrieval "holography"

Details Surface adjustment of the KOSMA 3m telescope using phase retrieval "holography" Surface adjustment of the KOSMA 3m telescope using phase retrieval "holography"

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..975f&link_type=abstract

Astronomy and Astrophysics, Vol. 274, p. 975 (1993)

Astronomy and Astrophysics

Astrophysics

5

Telescopes, Instrumentation: Detectors, Methods: Numerical

Scientific paper

The surface of the 3 m primary reflector of the KOSMA telescope was readjusted with the help of a phase- retrieval algorithm developed for and previously used at the JCMT. The new algorithm for fitting the surface deviations is split into two parts corresponding to large and small scale deformations, thus allowing us to identify large scale deformations of the primary mirror that cause severe problems with regard to convergence in previous phase retrieval algorithms. The modular software is easily adaptable to different telescopes.
In order to achieve the high dynamic range required by the phase-retrieval algorithm for the different beam pattern measurements, a high resolution acousto-optical deflector was combined with a photomultiplier for detecting the deflected light. The large scale deformations of the dish were successfully removed and a surface accuracy of about 40 μm was achieved, leading to an aperture efficiency of 24 % and a main beam efficiency of 29% at 492 GHz.

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