Dynamic displacement measurements by videogrammetry

T. S. Sriranga, R. Samuel, Raghunatha Behara, P. Radhakrishnan

Abstract

Photogrammetry and Videogrammetry techniques are being applied for a variety of spacecraft structural applications including shape, dimensional stability and dynamic displacement measurements. Static object measurements serve to provide either shape or distortions in a statically loaded structure during qualification tests. Dynamic measurements are essential during motion measurement and determination of mode shape of flexible appendages and Synthetic Aperture Radar antenna panels. Configuration of a PC-based image measurement and processing system for motion measurements using two time-synchronized video cameras is reported here. Time synchronization hardware details, automated image processing using video module of PhotoModeler as also visualization are explained in this paper. The number of images, and target points that can be used for measurement are only limited by the PC hardware infrastructure. Displacement measurements have been done on targets mounted on crosshead of an X-Y motion system to ascertain the accuracy of measurements within the range of two video cameras. Laser Tracker was used to verify the camera measurements.

Keywords

Videogrammetry system; Dynamic displacement measurement

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IMEKO-TC14-2007-37.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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