In this paper we show a new automated measuring system based on a fast optical co-ordinate acquisition device that performs the calculation of all the parameters characterizing the strain of an industrial piece. These results are obtained with high accuracy and in real time. An application of this improved system is illustrated and the whole measuring procedure is described in the following steps: grid marking on the metal sheet, stamping, co-ordinate acquisition, calculation of the strain parameters and their visualizaiton.
In this paper a new automatic strain analyzer system for sheet metal stamped parts is presented. This device is based on an optic 3D scanner working with structure white light, that performs measurements with high speed and accuracy. This new device can be a very useful tool in manufacturing industry.
A new three-dimensional optical digitizer working with white light and high accuracy has been developed for applications in orthodontic diagnosis, to store and analyze data taken from plaster dental casts. The scanner consists basically of a triangulation device made of a CCD camera and an active light projector using Gray code and the phase stepping method to sample the surfaces under tests. Dense clouds of 3D points of the object's surface, related to the device's reference system, are generated, from which very exact measurements can be taken. This technique allows us to greatly improve the accuracy of results that previously were obtained by using mainly manual methods. Our system has been tested successfully on many different samples.
Medical therapeutic applications using lasers involves understanding the
light tissue interaction, in particular the rate ofphotochemical and thermal
reactions. Tissue is composed ofa mix ofturbid media. Light propagation in
turbid media can be described by the so-called Equation of Radiative Transfer, an
integro-differential equation where scattering, absorption and internal reflection
are significant factors in determining the light distribution in tissue. The Equation
of Radiative Transfer however can not commonly be solved analytically.'
In order to visualize and simulate the effects of laser light on heart
tissues (myocardium) in relation to the treatment of irregular heart rates or so
called arrhythmias, a fast interactive computer program has been developed in
Java.
In this work, an optical system for digitizing 3D objects by using structured light is described. It is fast, contactless, highly accurate and it can work in strongly illuminated environments. An application for an industrial quality control set-up is presented, in which sand cores to be used in the car industry are automatically handled by a robot and analyzed by the 3D digitizer. After the analysis of each core presented by the robot, the digitizer sends an OK or KO instruction for the faultless or faulty piece to be placed by the robot in a different area. In order to perform all the calculations required for the analysis and for the hardware control, a specific software has been developed. A series of examples and result are shown with comments on the advantages of the method here described.
The planning of a breast reconstruction surgical operation has to resolve the problem of measuring directly on the patient meaningful anthropometric points from which distances, areas and volumes have to be calculated. In this paper, we propose using a 3D optical digitizer to perform this task.
The nonlinear directional coupler is analyzed in the presence of asymmetrically distributed and saturable nonlinear refractive index. We make use of the linear supermodes of the structure and phase-space techniques, which allows to obtain the main features of its behavior, without the need of solving the coupled mode equations.
In this paper we introduce the use of normalized parameters to study an electrooptically active
Y-Junction, by means of a five-layer model and the step approximation method. In a similar way
as it is done for three-layer and four-layer waveguides, we find a set of dimensionless parameters for
five-layer waveguides that allows the description of their waveguiding features.
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