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Showing papers in "Optics and Lasers in Engineering in 2001"


Journal ArticleDOI
TL;DR: Fourier transform profilometry is one of the popular non-contact 3D measurement methods, where a Ronchi grating or sinusoidal grating is projected onto a diffuse three-dimensional surface, and the resulting deformed grating image is detected by a CCD camera and processed by a computer as discussed by the authors.

588 citations


Journal ArticleDOI
S. Petitgrand1, Reda Yahiaoui1, K. Danaie1, Alain Bosseboeuf1, J.P. Gilles1 
TL;DR: In this article, it is demonstrated that time-resolved measurements up to 800 kHz can be performed with a lateral resolution in the micrometer range and a vibration amplitude detection limit of 3-5nm.

151 citations


Journal ArticleDOI
TL;DR: In this paper, a surface contouring by phase-shifting digital holography is proposed that provides surface height from a change of reconstructed object phases due to the tilt of object illumination.

117 citations



Journal ArticleDOI
TL;DR: The algorithm of a phase difference between two deformed fringes, the 3-D phase unwrapping method based on the phase difference algorithm, and the computer simulation and experiment results show that this method can efficiently deal with the dynamic3-D shape measurement.

112 citations


Journal ArticleDOI
TL;DR: In this paper, a simple and fast interferometric method for the analysis of shape and deformation of small objects by optical means is described, which can be the starting point for the determination of material parameters like Poisson-ratio, Young's modulus or the thermal expansion coefficient.

112 citations


Journal ArticleDOI
TL;DR: In this article, a digital implementation of the phase-shifting process, which requires only one image to be taken, is presented, where the reference grating is superimposed numerically onto the projected grating lines.

72 citations


Journal ArticleDOI
TL;DR: In this paper, deformation measurements for solder interconnects of flip chip and chip scale packages are presented for the experimental support of finite element simulation by means of experimental validation of mechanical modeling.

69 citations


Journal ArticleDOI
TL;DR: In this paper, optical coherence tomography (OCT) was used for non-destructive characterization of polymer matrix composites, which can be applied to a variety of problems in polymer composites such as microstructure determination for permeability and mechanical property prediction, void, dry spot, and defect detection, and damage evaluation.

67 citations


Journal ArticleDOI
TL;DR: In this paper, a fiber optic real-time sensor system has been developed that can sense resin at various locations on a single fiber using long-period gratings and a polychromatic source.

65 citations


Journal ArticleDOI
TL;DR: In this article, the use of Raman spectroscopy to study the functioning and reliability of micro-electromechanical systems and packages is discussed, including identification of materials, study of their crystallinity, uniformity and composition, and measurement of local temperature and stress.

Journal ArticleDOI
TL;DR: In this paper, the results of interferometric investigations of heart valve bio-prostheses with a setup for lensless Fourier holography are presented which demonstrate that this technique is applicable to such biological samples with their wet and unstable surfaces.

Journal ArticleDOI
TL;DR: In this article, the temporal pulse train modulation during laser percussion drilling was found to effect significant changes to the material ejection processes, and the results showed that the use of linearly increasing SPDPC method increased the downward material removal fractions, from 20% to 28% observed in NDP drilling, to 34% to 39%.

Journal ArticleDOI
TL;DR: In this paper, the authors compare white-light interferometry and the fringe projection technique for the analysis of microscopic structures and micro devices, and present a new technique, the scanning fringe projection (SFP), which enables absolute 3D measurements with one single grating period.

Journal ArticleDOI
TL;DR: In this paper, an optical method which allows the accurate visualization of the mixing zone between two high-speed flows inside an ejector is described, which associates Rayleigh scattering, laser induced fluorescence and image processing.

Journal ArticleDOI
TL;DR: In this paper, the utility of Lau phase interferometer with linear gratings and white light source to measure temperature and temperature profile of an axisymmetric flame was investigated, which was in good agreement with the temperature measured with thermocouple and datalogger.

Journal ArticleDOI
TL;DR: In this paper, the authors describe a new, laser supported, eddy current microscope for the real-time visualization of eddy currents distributions, which includes a conventional microscope, a lighting technique, an analyzator, and a CCD sensor.

Journal ArticleDOI
TL;DR: In this paper, an advanced flip-chip package with fine interconnection features was analyzed using phase-shifting moire interferometry (PSMI) in conjunction with image analysis software developed for this purpose.

Journal ArticleDOI
TL;DR: In this paper, the issues involved in the laser micro-drilling of PCB vias, including beam characteristics and processing mechanisms, for different substrates are investigated, and a brief comparison with the other two emerging technologies, i.e., photo-vias and plasma etching is also discussed.

Journal ArticleDOI
TL;DR: In this paper, the authors describe the basics of DMD technology, illustrates the principle setup of a newly designed instrument, shows results achieved with it and gives examples for its application, including optical metrology applications.

Journal ArticleDOI
TL;DR: In this paper, a scanning laser Doppler velocimetry (LDV) system was designed for measuring the velocity distributions in the deformation zone in plate rolling is reported.

Journal ArticleDOI
TL;DR: In this article, a 400nm second harmonic Ti-Sapphire femtosecond laser was applied to structure silicon base on a direct-write process in air, where a series of lines were ablated with pulses of 300-fs duration at varying power densities ranging from 50 to 100 nJ of energy on 2″ silicon wafers.

Journal ArticleDOI
TL;DR: In this paper, a detailed description of the two-step technique of residual stresses determination is presented, where the first step is a high-precision measurement of in-plane displacement components describing a distortion of drilled hole in principal strain directions due to residual stresses redistribution.

Journal ArticleDOI
TL;DR: In this article, deformation measurements were performed with TV-holography to estimate the suitability of several conservation agents and procedures, which are developed to preserve the extremely endangered paint layers of the figures.

Journal ArticleDOI
TL;DR: In this article, the authors present a concept of optical measurement station for complex testing of microelements including MEMS, MOEMS and electronic components and assemblies, which is based on a glass waveguide or air cavity waveguide arrangement.

Journal ArticleDOI
TL;DR: In this paper, the confocal principle is applied for determining the variation and the absolute value of the focal length of a microlens array and using a self-filtering method, the deviation of the periodic structure of micro-lens arrays is investigated theoretically and experimentally.

Journal ArticleDOI
TL;DR: In this paper, a lumped parameter mathematical model is developed to relate the cut depth to the laser cutting parameters and material properties, taking into account the threshold power of the incident laser beam for the initiation of cutting and modifying an earlier cutting model so that it applies to a wide set of process parameters ranging from low to high laser powers and slow to fast cutting speeds.

Journal ArticleDOI
TL;DR: In this paper, a luminous ratio was applied to evaluate four types of material surfaces; anodized aluminium, stainless steel, poly-butylene tetra-phthalate (PBT), and phenol formaldehyde, marked using a Nd:YAG laser.

Journal ArticleDOI
TL;DR: In this paper, a theoretical model has been developed to study the mechanical behaviors of the interface between an embedded optical fiber with coating material and a linear strain matrix, and the results show that the longitudinal stress and strain in the fiber optic sensor are different from that distributed in the host material and depend on the strain distribution and embedded length of the optical fiber as well as the material properties of the fiber coating.

Journal ArticleDOI
TL;DR: In this article, an optical method was used for the determination of the plastic zone size generated on the surface of a notched metal specimen under conditions of low-cycle fatigue, using white-light scattering generated by plastically induced surface roughness.