Surface measurement of the TRAO 14 meter antenna with a shearing interferometry

Details Surface measurement of the TRAO 14 meter antenna with a shearing interferometry Surface measurement of the TRAO 14 meter antenna with a shearing interferometry

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ijimw..18.1565p&link_type=abstract

International Journal of Infrared and Millimeter Waves, vol. 18, issue 8, pp. 1565-1574

Physics

3

Scientific paper

We employed shearing interferometric technique to the TRAO 14 m antenna to measure and improve the surface figure. For the first time, this technique is combined with a 150 GHz band heterodyne receiver having a narrow IF band width of 500 MHz and results in the improvement of surface to 60 μm at a 0.9 m spatial resolution. The beam efficiency measured after this correction is increased from 36% to 44% at 150 GHz. It was found that the technique is very useful in measuring and correcting, at least, the large scale surface figure of an antenna in an economical way.

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