07 Fakultät Konstruktions-, Produktions- und Fahrzeugtechnik
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/8
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Item Open Access Application of interferometry and holography for precision measurements(1984) Tiziani, Hans J.Phase measurement techniques are becoming a useful tool for precision measurements. Spatial as well as temporal phase shift methods can be used. Optical testing, where computer analysis of interference fringes is becoming increasing important, will be discussed in connection with testing optical components, microprofiles as well as for testing aspheric surfaces. In addition, methods using heterodyne techniques and real time holography will be described.Item Open Access Testing of aspheric surfaces with computer generated holograms(1988) Tiziani, Hans J.; Packroß, Bernd; Schmidt, GerhardAspherical surfaces are becoming more important and can even be mass producted. There is a need for flexible test methods of high accuracy. The paper describes the combination of a computer generated holograms with a partially compensating lens as a powerful tool. An example for testing a steep aspheric surface will be given.Item Open Access Holographic interferometry and speckle metrology : a review of the present state(1983) Tiziani, Hans J.The review paper will describe the present state of holographic and speckle techniques as applied to industrial measurement. The basic principles of both techniques will be outlined with special attention given to their advantages and limitations. Current developments in the field will then be described including the testlng of rotating automobile tyres by holographic interferometry and a heterodyne technique to gain an insight into noise generation mechanism. Methods for real-time holographic and speckle recording to facilitate the use of the techniques in an industrial situation will be discussed.Item Open Access Mikro-Profilometrie zur Bestimmung der Topographie und Rauheit technischer Oberflächen mittels Heterodyn-Laserinterferometrie(1989) Leonhardt, Klaus; Rippert, Karl-Heinz; Tiziani, Hans J.Ein Heterodyn-Profilometer zur Messung der Rauheit polierter und feingeschliffener Oberflächen und zur Formmessung wird beschrieben. Die Vertikal- oder Höhenauflösung liegt bei 0,5 nm, der Meßbereich für Formmessungen an glatten Oberflächen bei 40 pm bei einer maximalen Abtastlänge von 300 mm. Die Lateralauflösung kann je nach Aperturausleuchtung bis zu 0,5 pm eingestellt werden. Anwendungen und Grenzen werden gezeigt, Formeln zur Lateralauflösung und zur Erfassung von Phasensprüngen sowie Profilhöhen-Übertragungsfunktionen werden diskutiert.Item Open Access Optical 3-D-measurement techniques : a survey(1989) Tiziani, Hans J.Close range photogrammetry will be more frequently applied in industry for 3-D-sensing when real time processing can be applied. Computer vision, machine vision, robot vision are in fact synonymous with real time photogrammetry. This overview paper concentrates on optical methods for 3-D-measurements. Incoherent and coherent methods for 3-D-sensing will be presented. Particular emphasis is put on high precision 3-D-measurements. Some of the work of our laboratory will be reported.Item Open Access Optical methods of measuring rough surfaces(1989) Leonhardt, Klaus; Rippert, Karl-Heinz; Tiziani, Hans J.The statistical parameters of surfaces to be measured for industrial applications vary over several orders of magnitude. Surfaces with large slopes or edges are particularly difficult to be recorded. Some measuring methods developed in our laboratory are compared and the range of applications are discussed. For polished and fine ground glass and metal surfaces a heterodyne profilometer with a vertical resolution of 0.5 nm, lateral resolution of 0.6 μm, and large scanning length is discussed. The interferometer can be changed from single- to double-pass operation by rotation of a quarter-wave-plate. For rougher surfaces a profilometer of the photometric-balance type with resolution Rq < 4 nm and dynamic range of 20 μm and an interference microscope with automated fringe evaluation is described. An integral white light roughness sensor covers the roughness range 0.04μm to 10μm and measures independently mean roughness and autocorrelation width.Item Open Access Meeting the optical talent needs of industry in Europe(1989) Tiziani, Hans J.The thematic "meeting the optical talent needs of industry in Europe" can be looked at from different points of view. In the present report the industrial activities and the education in optics are summarized. My colleagues of the "Institut d'Optique" in Paris and the Imperial College in London will report on the curriculum in optics in Paris and London. The emphasis is more on the model we use at the University of Stuttgart. It is a particular engineering curriculum forming engineers with a good optics background.Item Open Access Nonlinear control of an industrial distillation column by exact linearization(1989) Allgöwer, Frank; Sax, Antonius; Gilles, Ernst Dieter-Item Open Access Verfahren zur optischen Rauheitsmessung und Mikroprofilometrie(1985) Leonhardt, Klaus; Rippert, Karl-Heinz; Tiziani, Hans J.In diesem Beitrag werden wegen der Kürze der Darstellung nur einige der bekannten Verfahren behandelt. Zwei Verfahren der Mikroprofilometrie, die im Institut für Technische Optik Stuttgart zur Zeit bearbeitet werden und ein Verfahren der integralen Rauheitsmessung, das in unserem Institut entwickelt wurde, werden ausführlicher beschrieben.Item Open Access Influence of the wall on the dynamic behavior of homogeneous tubular reactors with a highly exothermic reaction(1974) Eigenberger, GerhartThe influence of the tube wall on the behavior of tubular reactors with a highly exothermic reaction was studied. The effect of heat accumulation in the wall has a considerable influence upon the transient behavior of the reactor. Because of this influence excess temperatures can occur if the feed temperature is lowered or the flow velocity is raised. For a gas phase reaction the transient behavior is determined almost completely by the heat capacity of the wall. An example of multiple steady states caused by axial heat conduction in the wall is given, and the influence of heat conduction in the wall is compared with that in the reaction mixture.
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