SURFACE MEASUREMENT OF THE TRAO-14 METER ANTENNA WITH A SHEARING INTERFEROMETRY

We employed shearing interferometric technique to the TRAO 14 m antenn a 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 sur face to 60 mu m at a 0.9 m spatial resolution. The beam efficiency mea sured after this correction is increased from 36% to 44% at 150 GHz. I t was found that the technique is very useful in measuring and correct ing, at least, the large scale surface figure of an antenna in an econ omical way.