Showing papers in "Optics and Lasers in Engineering in 2003"

TL;DR: In this paper, the authors suggest a bio-speckle technique as a potential methodology for the study of impact on apples and the analysis of bruises produced by them, and correlate physical properties of apples with quality factors using a non-contact and non-invasive technique.

TL;DR: In this article, the laser fading process has similar, even better results, in some cases, than the conventional technologies of indigo-dyed denim, in which the authors used the beams from Nd:YAG laser (1064 nm and its second harmonic 532 nm), CTH:Y AG laser (2.09μm), CO2 laser(10.6μm) and various laser beam parameters to obtain a similar fading appearance like the one obtained by conventional processes.

TL;DR: In this paper, the Cook-Gordon Mechanism was used to model the dynamic interaction between interlayer crack formation and intra-layer crack growth in homogeneous layered materials that occur within microseconds after impact.

TL;DR: In this paper, the authors explore the possibility of producing several beam shapes with conical or cylindrical geometry using conical lenses, and discuss optical schemes for generation of hollow laser beams; with 3D intensity distribution surrounding all directions, a dark core region can be obtained.

TL;DR: In this article, Fourier transform profilometry, phase shifting and spatial phase detection were used to estimate the maximum and RMS errors of a spherical dome illuminated by fringes projected from an offset angle.

TL;DR: In this article, the fracture behavior of a dynamically loaded edge crack in a brittle-ductile layered material, as a function of applied loading rate, was experimentally investigated, and the results indicated that the incorporation of a thin ductile reinforcement layer can increase both the overall fracture toughness and strength of a nominally brittle material.

TL;DR: In this paper, surveys on automatic and quantitative deformation measurements using CCDs and computers in holographic interferometry and speckle metrology for diffusely reflecting surfaces are presented.

TL;DR: In this paper, an electro-optical switching effect from an opaque to a transparent state occurring at a threshold value of the applied field in a polymer dispersed liquid crystal (PDLC) was observed.

TL;DR: This poster presents a poster presenting a probabilistic procedure to constrain the response of the immune system to chemotherapy-like injuries in mice.

TL;DR: In this paper, a whole-field method based on the digital image correlation has been investigated and applied to cold rolling, where various rolling parameters have been obtained from the recorded images, including the neutral point location and neutral angle, forward and backward slips, the length of the contact arc, etc.

TL;DR: In this article, a focused ion beam (FIB) Moire method is proposed to measure the in-plane deformation of an object in a micrometer scale, which is generated by the interference between a prepared specimen grating and FIB raster scan lines.

TL;DR: In this article, the authors developed a mathematical model to calculate the temperatures, pressures and stresses during laser shock processing for time-modulated (ramp-up, ramp-down and rectangular) laser pulses.

TL;DR: In this paper, a procedure of fabricating zero-thickness grating, an optical setup and a recording system for dynamic moire interferometry and a data reduction procedure via nonlinear regression analysis are described.

TL;DR: In this paper, the tracheid effect was used to detect ellipses and phase demodulation was used for grain orientation measurement on planed softwood surfaces, and the results showed that the method of ellipse detection is suitable for the grain orientation of planed hardwood surfaces.

TL;DR: In the improved method, the initial random phase of the speckle pattern is evaluated using a number of phase-shifted images before the deformation under study, increasing the accuracy of the initial phase estimation and reducing influences from image noise and other measurement disturbances.

TL;DR: In this article, a compensation algorithm is introduced for improving the correlation coefficient of the digital speckle correlation method, which can increase the correlation coefficients from 0.70 to 0.99, which will be of much benefit for the improvements of the measuring accuracy.

TL;DR: In this paper, a photoacoustic NO2 traces detection based on continuous and pulsed laser emitting at 532nm was presented, where both systems were calibrated with known NO2-pure air mixtures.

TL;DR: A new solution that is based upon the vibration analysis of the microparts that shows that such key properties as e.g. the thickness of springs or membranes can be determined exactly.

TL;DR: This paper provides an overview of recent developments and applications of high-speed electronic speckle pattern interferometry (ESPI) and related techniques ranging from high- Speed pulsed laser techniques to high- speed camera methods.

TL;DR: In this article, a theoretical analysis of the sensitivity vector components behavior is made and an accuracy study is reported by using a spherical dual-beam optical setup, which shows results of fracture measuring by using moire and speckle interferometric methods.

TL;DR: A new phase-measuring surface profiling technique of a moving object that can be used for the profile inspection of products moving on a conveyor system in a factory is proposed.

TL;DR: In this paper, the authors developed an electro-optic device for relative distance measurement, which has an accuracy of 100 μm, a working distance of 20 cm and a range of 10 mm.

TL;DR: In this article, an innovative architecture for the exploitation of the whole collected solar energy is described, where a sun pointing optical concentrator focuses the received energy, containing the part of the required solar spectrum, in a low loss optical fiber transmission line.

TL;DR: In this article, an analysis on the repeatability of a laser percussion drilling process is conducted using a flash lamp pumped Nd:YAG laser on 2 mm thick stainless-steel sheets.

TL;DR: In this paper, it is demonstrated that silicon when rendered low dimensional, e.g. in form of nanocrystals or quantum wires, can be turned into an active photonic materials which shows light amplification characteristics, non-linear optical effects, photon confinement in both one and two dimensions, photon trapping with evidences of light localization, and gas sensing properties.

TL;DR: In this paper, a high-speed phase-shifted speckle interferometer has been developed recently for studying dynamic events, which allows the determination of time-varying absolute displacement maps.

TL;DR: By applying the recursive algorithm-filtering technique on speckle images of defects of rubber material, it is shown that this technique is the most effective and speedy method for the filtering of ESPI fringe patterns.

TL;DR: In this article, a color camera recorded five isoclinic images coupled with isochromatics from a plane polariscope with five different settings, respectively, and the unloaded light intensity of the model is systematically studied.

TL;DR: In this article, a model based on simple extension of micromechanics prediction has been proposed for dynamic fracture behavior of syntactic foams made of thin-walled microballoons dispersed in epoxy matrix.

TL;DR: In this paper, a bi-material specimen made of PSM-1 ® and Scotchply ® 1002, a unidirectional glass fiber reinforced epoxy composite, was used to study static and dynamic fracture of interfaces between orthotropic and isotropic materials using photoelasticity.