Aurelian Ovidius Trufasu

Optomechatronic system for position detection of a mobile mini-robot

This paper presents an optomechatronic system which can detect, by triangulation, the position of a light point source, fastened onto a robot part. The sensing system consists of two positioning modules for optical transducers, which automatically follow the direction of the light point source. The system control is accomplished by means of data acquisition boards and LabVIEW programming.

Rapid Prototyping a Way to Better Optical and Ergonomic Adaptation of Spectacles

This paper explains and demonstrates how to use rapid prototyping to make human sight better compensate by aerial devices in according to optical prescription and facial profile. The paper show a way to improve or match the aerial devices (aka frames) with individual facial characteristics and deliver a customized solution to fit on face and keep device in place for general comfort and better sight. Examples used in this material are realized by authors themselves

Device design to scan a dental imprint

The following essay has the purpose to realize and design an optical machine for the study of dental occlusology in order to improve it by establishing the force distribution diagram of the patient’s chewing profile, diagrams of great importance for obtaining a great dental work result.

New experimental setup for studying the influence of surface material and topography on tribological behavior

The paper presents the results of a scientific research using an original experimental setup dedicated for studying the influence of surface material and topography on tribological behavior. The experimental setup is provided with a safety clutch with two steel disks. On the frictional disk, permanently maintained, a ferodo ring is bonded. The other disk, with the material to be tested, was changed each time. Silicon microtextured wafers and chromium (non)textured thin layers deposited on silicon wafers were tested. The size and shape of the depressions were varied and their influence on the friction coefficient was studied. The angular speed of driver and driven shaft was measured with two non contact tachometers.

Spectral signal processing for tiny optical pieces

Spectral system (acronym SPECTECH) is designed to meet the following basics: a) to assure measuring tiny optical single lens in a standard configuration; b) configured for reflected or transmitted beam light; c) configured by user off line to monitor manufacturing or mounting optical components; d) to be flexible to be equipped with more than one spectral detector. Initially, it is equipped with two spectral detectors, but in short time to be able to use more than two. e) configured as process spectrophotometer (continuously) to monitor manufacturing or mounting optical components; f) to be updated or upgraded to meet other necessities. SPECTECH system is a modular one, allowing spectral determinations in a wide range of spectrum (385-1100 nm) and with two detectors UV-VIS (190-1100) and NIR (1000-1700nm) the domain can be wider, covering spectrum from 190 to 1700 nm. Keywords: spectral signal, spectrometry.

Reflected hotspot used in industrial vision

The paper deals with the measuring of a robot displacement, by stereo image matching; images of a hotspot placed onto the robot, generated by LASER reflected radiation are acquired by two CCD cameras; the reflective point is up to designer, in this particular case being the reflective surface of a small ball placed in view field of cameras. The technique to determine the 3D displacement of the robot, using the image matching approach, is presented. Using a pair of stereo images, the coordinates for a set of points belonging to the robot in a reference position are computed in a 3D Cartesian system. The procedure is then repeated for a new position. In order to demonstrate the validity of this technique, some experimental results are also presented.

Nanopolishing; parameters and techniques

The thermal regime had to meet two needs: to be big enough for a fast polishing and small enough not to influence the support or piece. The dilatation coefficient is different for pieces and support make a modification of outside topography which influence the final shape of surface, consequently ΔN. The present study propose to establish a link between temperature uniformity in the same time on piece or polishing device surface, respectively, final quality of topography polished surface.

The simulation of the behavior of lenses in the telecentric incident beam

The paper is focused on the behavioral simulation of the mineral and organic lenses, defined by geometric characteristics (the accumulation radius, thickness, diameter) [2] and material characteristics, for a certain incident wavelength [2]. The simulation provides a picture of the ray-tracing for the second and third reflection/refraction. At the same time, the user can display the print of a ray on a normal plane related to optical axis direction. The authors designed the simulation program, aimed to evaluate the wounded through the multiple reflections in the spectre available for chosen material. On this way, the disparity of a certain parameter will influence the transference through lenses for some radiation or spectre. The paper is designed to be used in optics, to shape the refractive/reflective components, and can predict the useful diameter of lenses, diaphragms or aperture stop; the paper is a guide for qualified professors to simulate the route of telecentric fascicle, after multiple reflection and refraction, to illustrate Snell’s law, all of them by changing the optical and geometrical characteristic of lenses.