Comparison of image based, laser, and accelerometer measurements

Abstract

Non-contacting measurements are extremely useful for many applications in which contacting measurements are not appropriate or impossible. Within this work, digital image correlation, dynamic photogrammetry, three dimensional (3D) laser vibrometry and accelerometer measurements are all used to measure the dynamics of a structure to compare each of the techniques. Each approach has its benefits and drawbacks, so comparative measurements are made using these devices to show some of the strengths and weaknesses of each technique, especially when measuring in a 3D environment. Comparisons are made in all cases to a well-studied finite element model as well as to each other. ©2010 Society for Experimental Mechanics Inc.