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Shock and Vibration
Volume 3, Issue 2, Pages 107-115

Calibrated Noncontact Exciters for Optical Modal Analysis

Henrik O. Saldner

Division of Experimental Mechanics, Luleå University of Technology, S-97187 Luleå, Sweden

Received 24 November 1994; Accepted 18 September 1995

Copyright © 1996 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Two types of exciters were investigated experimentally One of the exciters uses a small permanent magnet fastened on the object. The force is introduced by the change in the electromagnetic field from a coil via an air gap. The second exciter is an eddy-current electromagnet one. The amplitude of the forces from these exciters are calibrated by using dynamic reciprocity in conjunction with electronic holography. These forces strongly depend upon the distance between the exciter and the object.