Dr. Frank Schubert Profile

Dr. Frank Schubert

at Fraunhofer

SPIE Involvement:

Author

Publications (9)

Proceedings Article | 27 March 2015 Paper

Phased array ultrasonic testing of dissimilar metal welds using geometric based referencing delay law technique

Taeyoung Han, Frank Schubert, Susanne Hillmann, Norbert Meyendorf

Proceedings Volume 9439, 943904 (2015) https://doi.org/10.1117/12.2086271

KEYWORDS: Ultrasonics, Metals, Nondestructive evaluation, Wave propagation, Phased arrays, Signal to noise ratio, Neodymium, Ions, Photonic integrated circuits, Field emission displays

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Proceedings Article | 9 April 2010 Paper

Wave field characterization for non-destructive assessment of elastic properties using laser-acoustic sources in fluids and eye related tissues

T. Windisch, F. Schubert, B. Köhler, E. Spörl

Proceedings Volume 7650, 76503J (2010) https://doi.org/10.1117/12.848449

KEYWORDS: Eye, Tissues, Acoustics, Laser vision correction, Cornea, Wave propagation, Pulsed laser operation, Interfaces, Diagnostics, Ultrasonics

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Proceedings Article | 9 April 2010 Paper

Ultrasonic inspection technique for NDE of fiber composite materials

Dieter Hentschel, Frank Schubert, Lars Schubert, Bernd Frankenstein

Proceedings Volume 7649, 76490Z (2010) https://doi.org/10.1117/12.848739

KEYWORDS: Transducers, Ultrasonics, Nondestructive evaluation, Structured optical fibers, Phased arrays, Manufacturing, Visualization, Inspection, Composites, Transmitters

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Proceedings Article | 11 April 2007 Paper

Guided wave based structural health monitoring of piping systems

Frank Schubert, Bernd Frankenstein, Klaus-Jochen Froehlich, Martin Kuettner

Proceedings Volume 6532, 65320I (2007) https://doi.org/10.1117/12.717909

KEYWORDS: Waveguides, Transducers, Structural health monitoring, Sensors, Wave propagation, Actuators, Nondestructive evaluation, Dispersion, Receivers, Wave plates

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Proceedings Article | 10 April 2007 Paper

Monitoring network for SHM in aircraft applications

B. Frankenstein, F. Schubert

Proceedings Volume 6530, 653014 (2007) https://doi.org/10.1117/12.718094

KEYWORDS: Sensors, Signal processing, Structural health monitoring, Digital signal processing, Transducers, Structured optical fibers, Acoustics, Data communications, Composites, Ferroelectric materials

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Proceedings Article | 9 May 2005 Paper

Numerical time-domain simulation of wave propagation and scattering in acoustic microscopy for subsurface defect characterization

Frank Schubert, Bernd Koehler, Pavel Zinin

Proceedings Volume 5766, (2005) https://doi.org/10.1117/12.602070

KEYWORDS: Zinc, Acoustics, Transducers, Solids, Microscopy, Computer simulations, Microscopes, Wave propagation, Interfaces, Microfluidics

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Proceedings Article | 9 May 2005 Paper

Application of photo and particle acoustic methods

Bernd Koehler, Frank Schubert, Gert Hentges, Norbert Meyendorf

Proceedings Volume 5766, (2005) https://doi.org/10.1117/12.602329

KEYWORDS: Acoustics, Scanning electron microscopy, Electrons, Particles, Ions, Sensors, Photons, Microscopy, Electron microscopes, Amplifiers

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Proceedings Article | 9 May 2005 Paper

Hollow shaft integrated health monitoring system for railroad wheels

B. Frankenstein, D. Hentschel, E. Pridoehl, F. Schubert

Proceedings Volume 5770, (2005) https://doi.org/10.1117/12.602310

KEYWORDS: Signal processing, Digital signal processing, Sensors, Acoustics, Diagnostics, System integration, Filtering (signal processing), Electronics, Optical filters, Safety

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The economic efficiency and competitiveness of environment-friendly rail transportation depends on safety, availability and maintenance of single highly loaded structure components. Until now these components have been changed in fixed maintenance intervals irrespective of any usage related conditions. With the knowledge and evaluation of the component conditions, life cycle costs can be reduced by means of optimized maintenance and/or “fit for purpose” design. For example, rail-bound vehicle wheel sets are among the most highly stressed travelling gear components of the bogie. if such a component fails, a serious accident may occur. For this reason, a health monitoring system based on the interpretation of ultrasonic sound signatures has been developed. First, the ultrasonic waves generated by an artificial defect on the outer wheel tread of a railroad wheel towards an acoustic sensor, placed inside the hollow shaft of the railroad axis were simulated with a EFIT (Elastodynamic Finite Integration Technique). The results achieved proved that relevant signals can be found in a frequency range up to 300 kHz. Based on this a diagnostic unit was designed and built for application under rotation conditions, which consists of a piezo-electric sensor, primary electronics, an analog-to-digital converter, a digital signal processor, a trigger unit, and a telemetric transmitter. This diagnostic unit was integrated in the hollow shaft of a railroad wheel axis, a component of a special laboratory test rig. Algorithms which allow for the rotation-synchronized processing of acoustic signals were implemented into the rotating diagnostic unit. After successfully completing a campaign for this test rig, a second test was performed inside the wheel/railroad simulation test rig of the Deutsche Bahn AG under railroad-like conditions. The data generated inside the hollow shaft of the railroad wheel axis by the diagnostic unit were telemetrically transmitted to an industrial computer. The detection of artificial defects of different sizes is shown in correlation with theoretical assumptions.

Proceedings Article | 1 July 2003 Paper

First investigations on the comparison of acousto-photonic imaging to imaging by photon density waves

Hans-Joachim Cappius, Korinna Haack, Uwe Netz, Frank Schubert, Gerhard Muller

Proceedings Volume 4960, (2003) https://doi.org/10.1117/12.477720

KEYWORDS: Scattering, Tissue optics, Sensors, Ultrasonography, Signal detection, Modulation transfer functions, Light scattering, Tissues, Modulation, Signal to noise ratio

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Showing 5 of 9 publications

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