High-accuracy contouring using projection moiré

Sciammarella, Cesar A.; Lamberti, Luciano; Sciammarella, Federico M.

doi:10.1117/1.2044847

Cited by 34 publications

(32 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The figure generally accepted for quantifying maximum accuracy on spatial coordinates measured with photogrammetry is 10 À5 of the largest dimension of the analyzed object. However, PM has been proven to be substantially competitive with photogrammetry regardless of the size of the investigated object (see, for instance, Sciammarella et al, 2005;Galietti et al, 2007;Sciammarella et al, 2008a,b,c). This was achieved by implementing correction functions very simple compared to the complicated bundle adjustment software which is usually utilized in photogrammetry.…”

Section: Discussionmentioning

confidence: 97%

A general framework for identification of hyper-elastic membranes with moiré techniques and multi-point simulated annealing

Cosola

Genovese

Lamberti

et al. 2008

International Journal of Solids and Structures

View full text Add to dashboard Cite

a b s t r a c tThis paper presents a hybrid procedure for mechanical characterization of hyper-elastic materials based on moiré, finite element analysis and global optimization. The characterization process is absolutely general because does not require any assumption on specimen geometry, loading or/and boundary conditions. The novel experimental approach followed in this research relies on a proper combination of intrinsic moiré and projection moiré which allows 3D displacement components to be measured simultaneously and independently using always the same experimental setup and just one single camera. In order to properly compare experimental data and finite element predictions, 3D displacement information encoded in moiré patterns which are relative to the deformed configuration taken by the specimen are expressed in the reference system of the unloaded state.A global optimization algorithm based on multi-level and multi-point simulated annealing which keeps memory of all best records generated in the optimization is used in order to find the unknown material properties through the minimization of the X functional built by summing over the differences between displacements measured experimentally and those predicted numerically.Feasibility, efficiency and robustness of the proposed methodology are demonstrated for both isotropic and anisotropic specimens subject to increasing pressure loads: a natural rubber membrane and a glutaraldehyde treated bovine pericardium patch, respectively. Remarkably, the results of the characterization process are in very good agreement with target data independently determined. For the isotropic specimen, the maximum error on hyper-elastic constants is less than 1% and the residual error on displacements is less than 3.5%. For the anisotropic specimen, the maximum error on material properties is about 3.5% while the residual error on displacements is less than 3%. The identification process fails or becomes less reliable if ''local" displacement values are considered.

show abstract

Section: Discussionmentioning

confidence: 97%

A general framework for identification of hyper-elastic membranes with moiré techniques and multi-point simulated annealing

Cosola

Genovese

Lamberti

et al. 2008

International Journal of Solids and Structures

View full text Add to dashboard Cite

show abstract

“…To this correction is added the final correction due to the effect of the surface profile on the fringe pattern topology. 2 …”

Section: Second Example Of Application: Stereolithographic Samplementioning

confidence: 97%

“…2 An orthogonal grating is fixed on the surface of the reference plane. This grating is used to calibrate the dimensions of the pixels of the charge-coupled device ͑CCD͒ camera by displacing the grating at different depths.…”

Section: Introductionmentioning

confidence: 99%

General model for moiré contouring, part 2: applications

Sciammarella

2008

Opt. Eng

Self Cite

View full text Add to dashboard Cite

Applications are presented of the general shadow-projection moiré model described in the companion paper, "A general model for moiré contouring, part 1: theory." Two examples are discussed in detail. One example deals with the deflection of a large-size thin panel subjected to bending. The other example analyzes the accuracy that can be achieved in laser lithography rapid prototyping. The first example illustrates some theoretical aspects of the general contouring model proposed in this research and explains the reasons for differences between theoretical predictions and experimental results. In the second example, the whole process of data gathering and merging using geometric primitives and optimization techniques is demonstrated practically. Finally, a clear relationship between the measured standard deviations and moiré sensitivity values is obtained. The results show that the proposed methodologies lead to a quasi-quadratic correlation.

show abstract

“…This problem can be avoided by using the projecting moiré without the trouble of depth of field (DOF) problem. Recognition and processing of the projected fringes, however, remains difficult for a computer software to automatically identify those blackand-white fringes without any specific optical characteristics among them [8][9][10]. In recent years, the rapid development of digital techniques promotes the applications of digital projection such as LCD or DLP projectors, which have advantages of convenience for use and low cost.…”

Section: Introductionmentioning

confidence: 99%

Application of color structured light pattern to measurement of large out-of-plane deformation

et al. 2011

View full text Add to dashboard Cite

Measurement of out-of-plane deformation is significant to understanding of the deflection mechanisms of the plate and tube structures. In this study, a new surface contouring technique with color structured light is applied to measure the out-of-plane deformation of structures with one-shot projection. Through color fringe recognizing, decoding and triangulation processing for the captured images corresponding to each deformation state, the feasibility of the method is testified by the measurement of elastic deflections of a flexible square plate, showing good agreement with those from the calibrated displacement driver. The plastic deformation of two alloy aluminum rectangular tubes is measured to show the technique application to surface topographic evaluation of the buckling structures with large displacements.

show abstract

High-accuracy contouring using projection moiré

Cited by 34 publications

References 3 publications

A general framework for identification of hyper-elastic membranes with moiré techniques and multi-point simulated annealing

A general framework for identification of hyper-elastic membranes with moiré techniques and multi-point simulated annealing

General model for moiré contouring, part 2: applications

Application of color structured light pattern to measurement of large out-of-plane deformation

Contact Info

Product

Resources

About