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Publication Type: search.filters.UBSTyp.KonferenzbeitragAuthor: search.filters.author.Tiziani, Hans J.Author: search.filters.author.Sodnik, Zoran

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    Dual wavelength heterodyne interferometry for rough surface measurements
    (1990) Fischer, Edgar; Sodnik, Zoran; Ittner, Thomas; Tiziani, Hans J.
    For interferometric topography measurements of optically rough surfaces dual wavelength heterodyne Interferometry (DWHI) is a powerful tool. A DWHI system based on a two-wavelength HeNe laser and a matched grating technique is described. This set-up improves system stability and simple heterodyne frequency generation.
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    Remote nondestructive material analysis by photothermal interferometry
    (1987) Sodnik, Zoran; Tiziani, Hans J.
    Interferometry is used for the detection of thermal waves to study material properties. A symmetrical interferometer as thermal expansion detector was developed for photothermal nondestructive material analysis. After mixing a phase shifted reference signal electrically to the interferometer signal, phase and amplitude exchange phenomena have been observed.
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    Dual-wavelength interferometer for surface profile
    (1990) Manhart, Sigmund; Maurer, R.; Tiziani, Hans J.; Sodnik, Zoran; Fischer, Edgar; Mariani, A.; Bonsignori, R.; Margheri, Giancarlo; Giunti, C.; Zatti, Stefano
    The design and first experimental results of a dual-wavelength heterodyne interferometer (DWHI) for precise surface profile measurements are presented. The DWHI is based on a Mach-Zehnder type interferometer with the surface to be measured in the sensing arm of the interferometer. Two adjacent wavelengths are simultaneously used in the interferometer; the range information is gained from the beat frequency of both heterodyne interferometer signals. Thus, the extreme range ambiguity of classical interferometers and their sensitivity to mechanical distortions are reduced by the ratio of laser frequency to beat frequency. The DWHI is expected to have the good SIN performance a of coherent detection system but also the capability of measuring to diffusely scattering targets. The main features of the system presented here are: - use of a single diode laser in combination with a high frequency Bragg cell to generate two adjacent wavelengths - use of an all-fiber concept for the optomechanical build-up
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    Doppelheterodyn-Interferometrie für hochgenaue Vermessung im Nahbereich
    (1992) Fischer, Edgar; Dalhoff, Ernst; Ittner, Thomas; Sodnik, Zoran; Tiziani, Hans J.
    In diesem Aufsatz wurde ein Meßsystem vorgestellt, welches sich aus der Kombination der Zweiwellenlängen-Interferometrie mit dem intensitätsunabhängigen Heterodyn-Verfahren zusammensetzt. Die resultierende Doppelheterodyn-Interferometrie vereinigt die Vorteile der beiden Verfahren. Ein großer Eindeutigkeitsbereich entsprechend der effektiven Wellenlänge A entsteht, darüberhinaus sind optisch rauhe Oberflächen als Meßobjekte zulässig; reduzierte Empfindlichkeit gegenüber Vibrationen und Umwelteinflüssen, hohe Auflösung infolge elektronischer Phasenbestimmung sowie hochgenaue Abstandsmessung in Echtzeit sind weitere Vorteile. Das Doppelheterodyn-Interferometer wird in Zukunft zu einem effektiven und dynamischen Meßinstrument zur hochgenauen Entfernungsmessung im Mikrometerbereich bis hin zu Meßdistanzen von 100 m entwickelt werden, für das sich schon jetzt zahlreiche Einsatzmöglichkeiten abzeichnen.
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    Nondestructive evaluation of solids by photothermal interferometry on nonreflective surfaces
    (1988) Sodnik, Zoran; Tiziani, Hans J.
    Thermal expansion interferometry is a simple and very sensitive tool for nondestructive material analysis. In its basic form highly reflective surfaces are needed however. We developed a modified experimental set-up that can be used on any surface and found a theoretical description in good agreement with the results.
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    Dual wavelength heterodyne interferometry using a matched grating set-up
    (1992) Fischer, Edgar; Ittner, Thomas; Dalhoff, Ernst; Sodnik, Zoran; Tiziani, Hans J.
    Two-wavelength double heterodyne interferometry is applied for topographic measurements on rough target surfaces. A two-wavelength HeNe laser and a matched grating technique are used to improve system stability and to simplify heterodyne frequency generation. Results obtained with an experimental set-up will be presented. The results obtained show that a dual wavelength heterodyne interferometer is appropriate for high precision ranging. Progressing developments for large distances will be discussed.