Measuring the gravitational astigmatism of a radio telescope

Details Measuring the gravitational astigmatism of a radio telescope Measuring the gravitational astigmatism of a radio telescope

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978itap...26..315v&link_type=abstract

IEEE Transactions on Antennas and Propagation, vol. AP-26, Mar. 1978, p. 315-318.

Physics

1

Astigmatism, Gravitational Effects, Optical Measurement, Radio Telescopes, Elevation Angle, Root-Mean-Square Errors

Scientific paper

The gravitational astigmatism exhibited by a radio telescope when tilted is analyzed by measuring the focal length in two perpendicular planes. An elongated rotatable feed which illuminates only a central strip of the telescope may be employed for the measurements. The focal length differential, rim deviation and rms surface deviation are expressed as a function of elevation angle. Application of the analysis to a 140-ft radio telescope shows the gravitational deformation to be primarily a simple astigmatic shape.

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