A surface profile reconstruction system using sinusoidal phase-modulating interferometry and fiber-optic fringe projection

2014 ◽  
Vol 20 (3) ◽  
pp. 294-298 ◽  
Author(s):  
Bo En ◽  
Duan Fa-jie ◽  
Lv Chang-rong ◽  
Feng Fan ◽  
Fu Xiao
Keyword(s):  
Fiber Optic ◽  
Surface Profile ◽  
Fringe Projection ◽  
Profile Reconstruction ◽  
Sinusoidal Phase Modulating

scholarly journals Fringe projection profilometry for recovering 2.5D shape of ancient coins

ACTA IMEKO ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 142
Author(s):  
Giuseppe Schirripa Spagnolo ◽  
Lorenzo Cozzella ◽  
Fabio Leccese
Keyword(s):  
Cultural Heritage ◽  
Good Accuracy ◽  
Three Dimensional ◽  
Surface Profile ◽  
Fringe Projection ◽  
Profile Measurement ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Cultural Heritage Objects ◽  
Physical Access

<p class="Abstract">The relief of form is undoubtedly one of the most topical topics in the field of cultural heritage. Physical access to historic and artistic manufactures can be limited by a lot of factors. For example, the access to the collection of the ancient coins is difficult, especially for students. Indeed, for coins digital archive of high-quality three-dimensional model and remote fruition is of great interest. The use of projected fringes for the measurement of surface profile is a well-developed technique. In this paper, we present a surface profile measurement system for small objects of cultural heritage where it is important not only to detect the shape with good accuracy but also to capture and archive the signs due to ageing. The illustrated equipment is simple, reliable, and cheap. Furthermore, some examples of acquisitions are presented to demonstrate the potentiality of the proposed scheme for recovering 2.5D shape of cultural heritage objects.</p>

Wavelet Transforms in Fractal-Based Form Tolerancing

1993 ◽  
Author(s):  
R. S. Srinivasan ◽  
Kristin L. Wood
Keyword(s):  
Wavelet Transforms ◽  
Design Research ◽  
Profile Analysis ◽  
Synthesis Method ◽  
Surface Profile ◽  
Synthesis Methods ◽  
Geometric Tolerancing ◽  
Analysis And Synthesis ◽  
Cost Implications ◽  
Profile Reconstruction

Abstract Tolerancing is a crucial problem for mechanical designers, as it has quality and cost implications on product design. Research in tolerancing has addressed specific areas of the problem. Building upon previous research, a unified approach for geometric tolerancing with fractal-based parameters has been recently proposed. This paper explores an alternative error profile analysis and synthesis method, based on wavelets, that maintains and extends the use of fractals for surface error abstraction. An overview of the theory of wavelets is provided, and the link between fractals and wavelets is established. Experimental data are used to illustrate the application of wavelet theory to surface profile reconstruction and synthesis. The synthesis methods are then implemented in the design of ball-bearing elements, demonstrating the utility of fractal-based tolerancing. Plans for further study and implementation conclude the paper.

Phase compensation with fiber optic surface profile acquisition and reconstruction system

2015 ◽  
Author(s):  
En Bo ◽  
Fajie Duan ◽  
Fan Feng ◽  
Changrong Lv ◽  
Fu Xiao ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Surface Profile ◽  
Phase Compensation

Surface profile reconstruction using near-field data

1995 ◽  
Vol 116 (1-3) ◽  
pp. 20-24 ◽  
Author(s):  
Jean-Jacques Greffet ◽  
Anne Sentenac ◽  
Rémi Carminati
Keyword(s):  
Field Data ◽  
Near Field ◽  
Surface Profile ◽  
Profile Reconstruction

A New Three-Dimensional Profilometer for Surface Profile Measurement Using Digital Fringe Projection and Phase Shifting

2005 ◽  
Vol 295-296 ◽  
pp. 471-476
Author(s):  
Liang Chia Chen ◽  
S.H. Tsai ◽  
Kuang Chao Fan
Keyword(s):  
High Speed ◽  
Structured Light ◽  
Three Dimensional ◽  
Surface Profile ◽  
Phase Shifting ◽  
Fringe Projection ◽  
Surface Measurement ◽  
Profile Measurement ◽  
Digital Fringe Projection ◽  
Fringe Patterns

The development of a three-dimensional surface profilometer using digital fringe projection technology and phase-shifting principle is presented. Accurate and high-speed three-dimensional profile measurement plays a key role in determining the success of process automation and productivity. By integrating a digital micromirror device (DMD) with the developed system, exclusive advantages in projecting flexible and accurate structured-light patterns onto the object surface to be measured can be obtained. Furthermore, the developed system consists of a specially designed micro-projecting optical unit for generating flexibly optimal structured-light to accommodate requirements in terms of measurement range and resolution. Its wide angle image detection design also improves measurement resolution for detecting deformed fringe patterns. This resolves the problem in capturing effective deformed fringe patterns for phase shifting, especially when a coaxial optical layout of a stereomicroscope is employed. Experimental results verified that the maximum error was within a reasonable range of the measured depth. The developed system and the method can provide a useful and effective tool for 3D full field surface measurement ranging from µm up to cm scale.

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