Optical Measurement Of A 3D Displacement
Field Using One Camera
Author(s)
D. Vavrik, J. Bryscejn, J. Jakubek & J. Valach
Abstract
The optical measurement of flat specimen deformation is a frequent task. In
some applications it is necessary to measure both the in-plane and out-of-plane
displacement or strain fields respectively. To achieve this goal a variety of
methods have been developed in the past. This paper describes a novel technique
based on the use of only one camera which employs a combination of two
different optical methods to achieve 3D displacement measurements. The optical
grid method for the measurement of the in-plane strain field and the proposed
Coded Photometric Stereo method for the measurement of the out-of-plane
displacement can be applied simultaneously. This approach reduces hardware
part costs. The combined method is full field (all data acquired at once),
non-contact and non-destructive.
Keywords: full field strain measurement, optical method.
1 Introduction
The finite element method is widely used for numerical simulations of solid
object behaviour in many applications questioning in some cases the necessity of
physical experiments. Available databases of material behaviour are quite
sufficient for simulations of linear systems. However for the simulations of
nonlinear systems, it is still necessary to have experimental information.
Unfortunately, the feedback based on strain measurements in several points only
can lead to accurate but an imaginary numerical solution. Full field strain
measurement is routinely performed today. Let’s reduce the class of the analyzed
object onto flat specimens only. Dependency on loading type and studied feature,
either the in-plane or out-of-plane experimental method is usually chosen. One
Keywords
full field strain measurement, optical method.
Related Book
Other papers in this volume
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