Dr. Dieter Hentschel Profile

Dr. Dieter Hentschel

at Fraunhofer-IZFP

SPIE Involvement:

Author

Publications (4)

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

Read Abstract +

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

Read Abstract +

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 | 9 May 2005 Paper

Microsystem for signal processing applications

B. Frankenstein, K.-J. Froehlich, D. Hentschel, G. Reppe

Proceedings Volume 5770, (2005) https://doi.org/10.1117/12.602108

KEYWORDS: Digital signal processing, Signal processing, Ceramics, Sensors, Power supplies, Analog electronics, Amplifiers, Data communications, Microsystems, Standards development

Read Abstract +

Proceedings Article | 9 May 2005 Paper

Statistical signal parameters of acoustic emission for process monitoring

Mareike Stephan, Klaus-Jochen Froehlich, Bernd Frankenstein, Dieter Hentschel

Proceedings Volume 5766, (2005) https://doi.org/10.1117/12.602068

KEYWORDS: Signal processing, Acoustic emission, Signal detection, Acoustics, Sensors, Abrasives, Materials processing, Semiconducting wafers, Silicon, Surface finishing

Read Abstract +

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years