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  1. No Access

    Chapter

    Thermographic Materials Characterization

    Thermal techniques are attractive for materials characterization. They provide sophisticated contrast mechanisms and fast, non-contact investigation of large inspection areas. Recent progress in the developmen...

    H. Rösner, U. Netzelmann, J. Hoffmann… in Nondestructive Materials Characterization (2004)

  2. No Access

    Chapter and Conference Paper

    Microscopic Characterization of Technical Magnetic Materials by the Photothermally Modulated Stray Field Technique

    The photothermally modulated stray-field (PMS) technique is used to image magnetic structures of ferri- and ferromagnetic materials with a few micrometer resolution. As detector for the thermally induced modul...

    U. Netzelmann, A. Kloster, J. Wang in Nondestructive Characterization of Materials XI (2003)

  3. No Access

    Article

    Microscopic Techniques for Characterization of Magnetic Layers

    In recent years increasing interest in magnetic materials especially amorphous and nano crystalline layers has arised. Due to the magnetostrictive and magnetoresistive properties magnetic materials obtained hi...

    N. Meyendorf, I. Altpeter, U. Netzelmann, J. Hoffmann… in MRS Online Proceedings Library (1999)

  4. No Access

    Article

    Nondestructive Characterization of Corrosion Protective Coatings on Aluminum Alloy Substrates

    This paper describes the initial phase of the development of a nondestructive, multisensor approach for detecting, quantifying and monitoring degradation of organic coatings applied to aluminum surfaces. Descr...

    J. Hoffmann, S. Sathish, M. Khobaib, N. Meyendorf… in MRS Online Proceedings Library (1999)

  5. No Access

    Chapter

    Nondestructive Testing of Ceramic Automotive Valves

    Ceramic components exhibit an attractive combination of advantageous properties, e. g. low density, good temperature and corrosion resistance. Therefore, they have a high potential for application in combustio...

    U. Netzelmann, H. Reiter, Y. Shi, J. Wang… in Nondestructive Characterization of Materia… (1998)

  6. No Access

    Chapter

    Defect Sizing in Ceramic Materials by High-Frequency Ultrasound Techniques

    Determination of defect sizes of small pores or inclusions in engineering ceramics is a requirement for the prediction of component strength and reliability. Many authors have developed experimental procedures...

    U. Netzelmann, H. Stolz, W. Arnold, G. Giunta in Acoustical Imaging (1993)

  7. No Access

    Chapter and Conference Paper

    Nondestructive Testing of Electric Contacts by Time-Resolved Infrared Radiometry

    The bonding of small electric contacts consisting of small platelets of silver alloys welded to thin copper sheets has been tested by time-resolved photothermal radiometry with step-function surface heating. T...

    U. Netzelmann in Photoacoustic and Photothermal Phenomena III (1992)

  8. No Access

    Chapter

    Volume Acquisition and Visualization of High-Frequency Ultrasound Data

    For nondestructive testing of modern ceramic components and other new materials, very often an inspection of the full sample volume is required. Conventional C-scan and B-scan images provide information on sin...

    U. Netzelmann, R. Herzer, H. Stolz, W. Arnold in Acoustical Imaging (1992)

  9. No Access

    Chapter and Conference Paper

    Study of Magnetostatic Modes in Yttrium Iron Garnet by Photothermal Laser Beam Deflection

    The photothermal laser beam deflection is used to obtain laterally and depth resolved ferromagnetic resonance spectra of magnetostatic modes in yttrium iron garnet (YIG) slabs at various microwave power levels...

    O. von Geisau, U. Netzelmann, S. M. Rezende… in Photoacoustic and Photothermal Phenomena II (1990)

  10. No Access

    Chapter and Conference Paper

    Thermoelastic Properties of a Two-Material Junction

    A two-dimensional theoretical approach describes the temperature distribution and the mechanical deformation in the vicinity of a two-material junction.

    N. Tankovsky, U. Netzelmann, J. Pelzl in Photoacoustic and Photothermal Phenomena II (1990)

  11. No Access

    Chapter and Conference Paper

    Photothermal Imaging Using Microwave Detection

    Local thermal modulation of magnetic resonance is used to obtain images of magnetic structures in recording tapes, amorphous metallic alloys and metallic films. The theoretical and experimental concepts of the...

    J. Pelzl, U. Netzelmann, Th. Orth… in Photoacoustic and Photothermal Phenomena II (1990)

  12. No Access

    Chapter

    Locally Resolved Magnetic Resonance in Ferromagnetic Layers and Films

    Recent widespread interest in the research and application potential of ferromagnetic films and layers owes much to the fact that many of their magnetic properties differ from those of the bulk materials. One ...

    J. Pelzl, U. Netzelmann in Photoacoustic, Photothermal and Photochemi… (1989)

  13. No Access

    Chapter and Conference Paper

    The Effect of Grain Size on the Photoacoustic Signal from Small Particles

    The photoacoustic (PA) signal of a powdered sample increases with decreasing grain size, in addition there occurs a certain change of the phase angle. Qualitatively, these observations are accounted for by an ...

    U. Netzelmann, J. Pelzl, D. Schmalbein in Photoacoustic and Photothermal Phenomena (1988)

  14. No Access

    Chapter and Conference Paper

    Inhomogeneous Ferromagnetic Resonance Absorption in Ferrites Detected by Photothermal Techniques

    Photoacoustic (PA) detection and the photothermal deflection (PD) technique have proved to be valuable tools for magnetic depth profiling and lateral imaging of magnetically inhomogeneous materials [1]. In thi...

    O. von Geisau, U. Netzelmann, J. Pelzl in Photoacoustic and Photothermal Phenomena (1988)

  15. No Access

    Chapter

    EPR of CuSO4·5H2O and Fe(III)-TPP Detected by the Photoacoustic Effect

    EPR spectra from polycrystalline samples of CuSO4·5H2O and Fe(III)-tetraphenylporphyrin have been studied by means of the photoacoustic effect. In Fe(III)-TPP three absorptions occur in the photoacoustic EPR spec...

    U. Netzelmann, E. v. Goldammer, J. Pelzl… in Photoacoustic Effect Principles and Applic… (1984)

  16. No Access

    Article

    Spin-label studies on protein proteinase inhibitors: Complex formation and conformational changes of the bovine trypsin inhibitor (Kunitz)

    H. R. Wenzel, H. Tschesche, E. von Goldammer… in Biophysics of structure and mechanism (1981)