Showing papers in "Optics and Lasers in Engineering in 1983"

TL;DR: The reflection grating method is a special case of the well-known reflection moire principle as mentioned in this paper, which is suitable for measurement of the slope and curvature of deformed object surfaces by superposition of at least two grating images, and can be determined using only one reflected grating image without moire lines.

TL;DR: The optical waveguide effect in the surface layer of chemically tempered glass is a useful tool for measuring surface stress for quality and process control purposes as discussed by the authors, and the theoretical basis, measuring techniques and apparatus are briefly reviewed.

TL;DR: The autostigmatic microscope is an instrument for measuring the line-of-sight distance to a reflecting surface and is used chiefly to measure the radii of lens surfaces as discussed by the authors, which can increase considerably its precision and its freedom from scattered light.

TL;DR: In this paper, the task of accurately superimposing two photographic transparencies is frequently encountered in some areas of optical metrology by recording a suitable line structure, along with the image, on each photograph.

TL;DR: In this article, the authors used EPI to measure the differential out-of-plane surface displacements which occur at a crack tip due to the formation of a plastic zone when the crack is put under an increasing incremental tensile load.

TL;DR: An optical method of measuring the pressure distribution in an automobile tyre contact area relies on the phenomenon of frustrated total internal reflection to produce a video image in which the brightness is a measurement of the pressure at any point.

TL;DR: In this paper, a plane polarized power beam was used to investigate the reactive gas-assisted laser cutting process and further experimental support for the existence of two different regimes in the oxygen-assisted cutting of steels and explains the dependence of the process on FeO2 exothermic reactions.

TL;DR: In this paper, the classical theory of the free-electron laser and possible applications in laser fusion, laser-induced chemistry, biochemistry, and solid-state physics are discussed.

TL;DR: In this paper, a range gating with sub-picosecond pulses was developed for 3D optical imaging, which is characterized by both high contrast and resolution, and the computer algorithm needed to reconstruct the image from the attenuated backscattering and to extend to three dimensions the one-dimensional depth resolution.

TL;DR: In this paper, an experimental device is described which is used to orientate small industrial components being fed along conveyor belts or in bowl feeders, identified by laser light scattered from discrete regions of the component which moves through a field of view.

TL;DR: In this paper, the authors used the back scattered light from the fiber optic Doppler anemometer (FODA) to measure the motility and swimming speed of the spermatozoa.

TL;DR: In this paper, an optical heterodyne system for measuring a vibration phase, which uses a frequency-shifted and phase-modulated reference beam, is proposed, which is applicable to a rough surface.

TL;DR: In this paper, a new method for frequency marking based on measuring the diffraction angle by moire deflectometry is proposed, which is demonstrated experimentally. But this method is not suitable for frequency segmentation.

TL;DR: In this article, a Schlieren laser technique has been used to investigate the transit time of the flame front at selected locations inside a running automotive engine, without disturbing the combustion itself.

TL;DR: In this article, a method for analysing the displacement field of a hologram from only one beam of light was proposed, and a method was then derived for stress and strain analysis, which possesses the advantages of being simple and precise and is capable of measuring structural strain.

TL;DR: In this paper, a method was derived for the determination of the dynamic stress intensity factor from isopachic fringe patterns around running crack tips obtained by double-exposure dynamic holographic interferometry.

TL;DR: In this article, both holographic interferometry and speckle interferometrics are used to analyse small rotation and a brief comparison of the two methods is also given.

TL;DR: In this article, a simple speckle-shearing interferometric method for the determination of moment distribution in a clamped circular plate under a concentrated transverse load at its center is described.

TL;DR: In this article, a computer simulation of a stripe-geometry semiconductor laser is studied and the lasing properties of the laser are obtained from the drive current and several device parameters using this computer model.