Abstract
This paper deals with the determination of the torsinal stiffness of an important component of antenna structures, namely, the azimuth tube, by holographic interferometry. Experimental investigations were carried out on a structural model of an azimuth tube with an opening and a slip joint at its mid-height. In addition to the determination of the torsional stiffness, the technique was successfully employed to isolate the rotational slip at the splice joint. The results of the experimental investigation compare favourably with those obtained by finite element analysis for the cases of an azimuth tube with unstiffened and stiffened openings. The work indicates that valuable quantitative information can be obtained by holographic interferometry and associated techniques.
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