Sign in to use this feature.

Years

Between: -

Subjects

remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline

Journals

Article Types

Countries / Regions

Search Results (10)

Search Parameters:
Keywords = sampling moiré method

Order results
Result details
Results per page
Select all
Export citation of selected articles as:
13 pages, 4980 KB  
Article
Characterization of Transparent Surfaces Through Double Fringe Projection, Implementing a Frequency Filtering Technique and Spatial Phase Demodulation
by Ubaldo Uribe-López, David Asael Gutiérrez-Hernández, Víctor Zamudio-Rodríguez, Josué del Valle-Hernández, Daniel Olivares-Vera, Raúl Santiago-Montero, Miguel Gómez-Díaz and Dulce Aurora Velázquez-Vázquez
Eng 2025, 6(9), 244; https://doi.org/10.3390/eng6090244 - 15 Sep 2025
Viewed by 378
Abstract
This study introduces a novel, low-cost, and non-invasive method for characterizing the surface profile of transparent objects using double digital fringe projection (DDFP). By projecting dual sinusoidal patterns that generate a Moiré effect and applying a frequency-domain Gaussian filter, the system isolates relevant [...] Read more.
This study introduces a novel, low-cost, and non-invasive method for characterizing the surface profile of transparent objects using double digital fringe projection (DDFP). By projecting dual sinusoidal patterns that generate a Moiré effect and applying a frequency-domain Gaussian filter, the system isolates relevant data for accurate phase recovery through the isotropic quadrature transform (IQT). Experimental validation with plastic and acrylic samples confirms the method’s high spatial resolution and robustness against ambient noise. Unlike traditional systems, this technique avoids coherent light sources and complex hardware, improving its accessibility for academic and industrial use in transparent surface metrology. Full article
(This article belongs to the Special Issue Emerging Trends and Technologies in Manufacturing Engineering)
Show Figures

Figure 1

16 pages, 11029 KB  
Article
Degradation Mechanisms of Mortar and Plaster Layers
by Miloš Drdácký, Radek Ševčík, Dita Frankeová, Veronika Koudelková, Jaroslav Buzek, Marek Eisler and Jaroslav Valach
Materials 2024, 17(14), 3419; https://doi.org/10.3390/ma17143419 - 11 Jul 2024
Cited by 3 | Viewed by 1678
Abstract
This article presents a case of complex investigation of defects of lime mortar and plaster that have been developing over a period of 48 years in a house in Prague and are strongly influenced by thermal and salt crystallization cycles. The aim of [...] Read more.
This article presents a case of complex investigation of defects of lime mortar and plaster that have been developing over a period of 48 years in a house in Prague and are strongly influenced by thermal and salt crystallization cycles. The aim of this research was to describe the degradation phenomena of mortars and plasters observed on a narrowly limited part of the building, combining structural elements of different types and ages and to explain the mechanisms of their formation and development. The geometric characteristics of the defects were determined by non-destructive methods, especially optical interference moiré, laser profilometry, photogrammetry, and infrared thermography. Material data were determined on samples by electron microscopy, ion exchange chromatography, and direct moisture content measurements. The results supported the hypothesis of the increase in the deformation of large buckles of detached plasters by the mechanism of buckling caused by loading of the edges with compression generated by volume changes. Direct loading of the boundary surfaces causes the formation of bulges in the confined areas. This study shows the importance of failure analysis of real structures to gain knowledge about the behavior of structures and materials under long-term service conditions. Full article
(This article belongs to the Special Issue Mortar Materials in Building Conservation)
Show Figures

Figure 1

11 pages, 603 KB  
Article
The Impact of Interaction between Body Posture and Movement Pattern Quality on Injuries in Amateur Athletes
by Dawid Koźlenia and Katarzyna Kochan-Jacheć
J. Clin. Med. 2024, 13(5), 1456; https://doi.org/10.3390/jcm13051456 - 2 Mar 2024
Cited by 5 | Viewed by 4263
Abstract
Background: this study aimed to examine the impact of interaction between body posture and the quality of movement patterns on injury frequencies in amateur athletes. Methods: The study sample consisted of 89 young amateur athletes. Movement pattern quality was assessed by [...] Read more.
Background: this study aimed to examine the impact of interaction between body posture and the quality of movement patterns on injury frequencies in amateur athletes. Methods: The study sample consisted of 89 young amateur athletes. Movement pattern quality was assessed by the Functional Movement Screen (FMS), test and body posture in the frontal plane was assessed by the moire method for the parameters Shoulder Slope Angle, Lower Scapula Protrusion Difference, and Pelvic Tilt Angle. Injury data were collected through completion of the Injury History Questionnaire for the past 12 months. Results: Using cluster analysis, participants were allocated into a either category with good (BPg) body posture or poor (BPp), and using FMS cutoff points (14), either a category of good movement pattern quality (MPg) or poor (MPp). Two-way ANOVA was performed, and the Bonferroni post-hoc test revealed a reduction in injuries among participants from the MPg-BPg group compared to the other three groups (p < 0.05). However, no interaction between factors was revealed. No statistically significant differences were observed among the remaining three groups in the case of injury prevalence (p > 0.05). Conclusions: A combination of proper body posture and high-quality movement patterns is associated with a lower frequency of injuries, without direct interaction between chosen factors, which suggests that they impact injury risk independently. Practicing suitable BP and ensuring high-quality MPs should be regarded as a strategy in injury prevention. Full article
(This article belongs to the Section Sports Medicine)
Show Figures

Figure 1

31 pages, 14077 KB  
Article
CCTV Camera Array for the Displacement and Strain Measurement of a Beam Specimen in a Laboratory
by Rujika Tuladhar, Punchet Thammarak and Said Elias
Buildings 2022, 12(11), 1778; https://doi.org/10.3390/buildings12111778 - 24 Oct 2022
Cited by 1 | Viewed by 2329
Abstract
The available conventional sensors, like displacement transducers, used in the Structural Engineering Laboratory are expensive. In addition to that, the need for data acquisition devices also escalates the expense invested in point contact measurement systems. The recent appeal of vision-based measurement and the [...] Read more.
The available conventional sensors, like displacement transducers, used in the Structural Engineering Laboratory are expensive. In addition to that, the need for data acquisition devices also escalates the expense invested in point contact measurement systems. The recent appeal of vision-based measurement and the search for cost-effectiveness has led to an exploration of the established sampling moiré method using cheap closed-circuit television (CCTV) cameras as a viable option. The sampling moiré method is simple and analyzes the displacements from grating images by a phase-shifting method. Several trial experiments were conducted, which demonstrated that the setup is at least as accurate as the traditional measuring system. An experiment was conducted on a steel I-beam for displacement measurement, which displayed satisfactory results. In addition, the setup was also tested for strain measurement, and it has yielded promising results that need fine-tuning. This paper discusses the challenges, findings, and the possibility of incorporating vision-based displacement measurements in laboratory platforms. Full article
(This article belongs to the Special Issue Structural Health Monitoring)
Show Figures

Figure 1

14 pages, 5815 KB  
Article
The Restored Premolars Biomechanical Behavior: FEM and Experimental Moiré Analyses
by Jose Luis Valin Rivera, Edison Gonçalves, Paulo Vinicius Soares, Giovana Milito, Jorge Octavio Ricardo Perez, Guillermo Francisco Palacios Roque, Meylí Valin Fernández, Henry Figueredo Losada, Fabrícia Araújo Pereira, Gilberto Garcia del Pino and Alexander Rodriguez Soto
Appl. Sci. 2022, 12(13), 6768; https://doi.org/10.3390/app12136768 - 4 Jul 2022
Cited by 5 | Viewed by 2289
Abstract
This study applied the finite element method (FEM) and the moiré strip projection method to evaluate the biomechanical behavior of healthy and endodontic-treated premolar teeth. The finite element method and the moiré strip projection method were applied to evaluate the influence of restored [...] Read more.
This study applied the finite element method (FEM) and the moiré strip projection method to evaluate the biomechanical behavior of healthy and endodontic-treated premolar teeth. The finite element method and the moiré strip projection method were applied to evaluate the influence of restored materials in association with cervical lesions and were considered as strain estimates for a tooth sample with 21 units, under loads of 25, 50, 75, and 100 N, frontal and oblique applied. The focused cases were: tooth H healthy; tooth A-MOD amalgam; tooth AL-MOD amalgam + lesion; tooth ALR-MOD amalgam + injury restored; tooth R-MOD resin; tooth RL-MOD resin + lesion; tooth RLR-MOD resin + injury restored. The results obtained by FEM simulation can be considered perfectly validated by the results presented by the experimental moiré projection analysis, demonstrating that the FEM numerical analysis can be used to evaluate the biomechanical behavior of healthy and endodontically treated teeth. Developing an alternative protocol to generate FEM three-dimensional models will lead to a ready and inexpensive tool since there is no need for costly equipment for tooth extraction prognosis. Full article
(This article belongs to the Topic Advances in Non-Destructive Testing Methods)
Show Figures

Figure 1

16 pages, 7575 KB  
Article
Online Deformation Measurement of Laser Repair Substrate Based on Orthogonal Sampling Moiré
by Wenxiong Shi, Chenghao Zhang and Huimin Xie
Appl. Sci. 2022, 12(11), 5469; https://doi.org/10.3390/app12115469 - 27 May 2022
Cited by 8 | Viewed by 2500
Abstract
As an important branch of metal additive manufacturing, laser repair has broad application potential in the aerospace, automobile and ship building industries. In the process of laser repair, metal powder is introduced into the laser action area and heated to a molten state [...] Read more.
As an important branch of metal additive manufacturing, laser repair has broad application potential in the aerospace, automobile and ship building industries. In the process of laser repair, metal powder is introduced into the laser action area and heated to a molten state to form a molten pool, which moves on the component surface according to the preset scanning path. Additionally, the temperature of the repaired component changes dynamically with the movement of the molten pool, leading to the time-evolution of stress and deformation. Therefore, online deformation measurement for the repair process is essential for understanding the evolution mechanism of stress and deformation in laser repair. However, extreme environments such as ultra-high temperature, strong laser radiation and metal powder splashing exist during the laser repair, which bring great challenges for dynamic optical measurement. In this paper, an online deformation measurement system based on orthogonal sampling moiré for laser repair environment is developed, which is applied to measure the deformation field of the metal substrate during laser repair. In the measurement, laser repair is performed on a cantilever beam substrate and orthogonal grating is prepared on the side surface of the cantilever beam. The real-time grating images are recorded by an optical imaging system, in which a group of filter components are used to obtain optical images with high signal-to-noise ratio. Finally, the deformation field of the substrate during laser repair is calculated with the orthogonal sampling moiré method. The results show that the scanning path in the repair process has a significant influence on the distribution of residual deformation, which offers reference for optimizing parameters of laser repair. Full article
Show Figures

Figure 1

15 pages, 77462 KB  
Article
Measurement of Focal Length and Radius of Curvature for Spherical Lenses and Mirrors by Using Digital-Grating Moiré Effect
by Chien-Yuan Han, Wen-Tai Lo, Kun-Huang Chen, Ju-Yi Lee, Chien-Hung Yeh and Jing-Heng Chen
Photonics 2021, 8(7), 252; https://doi.org/10.3390/photonics8070252 - 1 Jul 2021
Cited by 5 | Viewed by 4486
Abstract
This paper proposes the use of digital-grating moiré effect for measuring the focal lengths and radius of curvatures of biconvex and biconcave spherical simple lenses and spherical mirrors. Based on Fresnel diffraction, the equation for the electric field of propagated light passing through [...] Read more.
This paper proposes the use of digital-grating moiré effect for measuring the focal lengths and radius of curvatures of biconvex and biconcave spherical simple lenses and spherical mirrors. Based on Fresnel diffraction, the equation for the electric field of propagated light passing through the test samples was derived. Through digital image post processing, the recorded intensity on an observation screen was superimposed on a digital grating to generate a moiré pattern. On substituting the slant angle of the moiré pattern into the derived equation, the focal lengths and radius of curvatures could be determined. The experimental results successfully demonstrated the feasibility of the proposed method; the percent errors for focal length and radius of curvature measurement were less than 0.5%. The measurement uncertainty was analyzed and the correctness of the derived equation was confirmed through simulation. Because of the use of digital image post processing, the proposed method has advantages such as a simple set up, easy operation, high stability, high accuracy, and low cost. Thus, the method has considerable potential in relevant application. Full article
Show Figures

Figure 1

13 pages, 4115 KB  
Article
A Binocular Vision-Based 3D Sampling Moiré Method for Complex Shape Measurement
by Wenxiong Shi, Qi Zhang, Huimin Xie and Wei He
Appl. Sci. 2021, 11(11), 5175; https://doi.org/10.3390/app11115175 - 2 Jun 2021
Cited by 13 | Viewed by 3855
Abstract
As a promising method for moiré processing, sampling moiré has attracted significant interest for binocular vision-based 3D measurement, which is widely used in many fields of science and engineering. However, one key problem of its 3D shape measurement is that the visual angle [...] Read more.
As a promising method for moiré processing, sampling moiré has attracted significant interest for binocular vision-based 3D measurement, which is widely used in many fields of science and engineering. However, one key problem of its 3D shape measurement is that the visual angle difference between the left and right cameras causes inconsistency of the fringe image carrier fields, resulting in the phase mismatch of sampling moiré. In this paper, we developed a phase correction method to solve this problem. After epipolar rectification and carrier phase introduction and correction, the absolute phase of the fringe images was obtained. A more universal 3D sampling moiré measurement can be achieved based on the phase match and binocular vision model. Our numerical simulation and experiment showed the high robustness and anti-noise ability of this new 3D sampling moiré method for high-precision 3D shape measurement. As an application, cantilever beams are fabricated by directed energy deposition (DED) using different process parameters, and their 3D deformation caused by residual stresses is measured, showing great potential for residual stress analyses during additive manufacturing. Full article
Show Figures

Figure 1

16 pages, 5183 KB  
Article
An Optical Crack Growth Sensor Using the Digital Sampling Moiré Method
by Xinxing Chen, Chih-chen Chang, Jiannan Xiang, Chaobo Zhang and Ming Liu
Sensors 2018, 18(10), 3466; https://doi.org/10.3390/s18103466 - 15 Oct 2018
Cited by 6 | Viewed by 5090
Abstract
High-accuracy crack growth measurement is crucial for the health assessment of concrete structures. In this work, an optical crack growth sensor using the digital sampling moiré (DSM) method is developed for two-dimensional (2D) crack growth monitoring. The DSM method generates moiré fringes from [...] Read more.
High-accuracy crack growth measurement is crucial for the health assessment of concrete structures. In this work, an optical crack growth sensor using the digital sampling moiré (DSM) method is developed for two-dimensional (2D) crack growth monitoring. The DSM method generates moiré fringes from a single image through digital image processing, and it measures 2D displacements using the phase difference of moiré fringes between motion. Compared with the previous sensors using traditional photogrammetric algorithms such as the normalized cross-correlation (NCC) method, this new DSM-based sensor has several advantages: First, it is of a higher sensitivity and lower computational cost; second, it requires no prior calibration to get accurate 2D displacements which can greatly simplify the practical application for multiple crack monitoring. In addition, it is more robust to the change of imaging distance, which is determined by the height difference between two sides of a concrete crack. These advantages break the limitation of the NCC method and broaden the applicability of the crack growth sensor. These advantages have been verified with one numerical simulation and two laboratory tests. Full article
(This article belongs to the Special Issue Smart Sensors for Structural Health Monitoring)
Show Figures

Figure 1

8 pages, 1626 KB  
Proceeding Paper
Small Displacement Measurement of Crack Opening Using One Pitch Phase Analysis (OPPA) Method
by Yoshiharu Morimoto, Akihiro Masaya, Thomas Yata, Duy Anh Luong and Quentin Quarles
Proceedings 2018, 2(8), 498; https://doi.org/10.3390/ICEM18-05407 - 29 Jun 2018
Cited by 1 | Viewed by 1656
Abstract
A new method to measure small displacement of crack width. Full article
(This article belongs to the Proceedings of The 18th International Conference on Experimental Mechanics)
Show Figures

Figure 1

Back to TopTop