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Microsystem for signal processing applications

 
: Frankenstein, B.; Fröhlich, K.-J.; Hentschel, D.; Reppe, G.

:

Meyendorf, N. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Advanced sensor technologies for nondestructive evaluation and structural health monitoring : 8 - 10 March 2005, San Diego, California, USA
Bellingham/Wash.: SPIE, 2005 (SPIE Proceedings Series 5770)
ISBN: 0-8194-5751-5
pp.152-159
Conference "Advanced Sensor Technologies for Nondestructive Evaluation and Structural Health Monitoring" <2005, San Diego/Calif.>
English
Conference Paper
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()
process monitoring; acoustic signal processing; microsystem

Abstract
Acoustic monitoring of technological processes requires methods that eliminate noise as much as possible. Sensor-near signal evaluation can contribute substantially. Frequently, a further necessity exists to integrate the measuring technique into the monitored structure. The solution described contains components for analog preprocessing of acoustic signals, their digitization, algorithms for data reduction, and digital communication. The core component is a digital signal processor (DSP), which performs the basic algorithms necessary for filtering, down sampling, FFT computation and correlation of spectral components particularly effective. A compact, sensor-near signal processing structure was realized. It meets the Match-X standard, which was specified by the German Association for Mechanical and Plant Engineering (VDMA) for development of micro-technical modules, which can be combined to application specific systems. The solution is based on AL2O3 ceramic components including different signal processing modules as ADC, as well as memory and power supply. An arbitrary waveform generator has been developed and combined with a power amplifier for piezoelectric transducers in a special module. A further module interfaces to these transducers. It contains a multichannel preamplifier, some high-pass and low-pass filters for analog signal processing and an ADC-driver. A Bluetooth communication chip for wireless data transmission and a DiscOnChip module are under construction. As a first application, the combustion behavior of safety-relevant contacts is monitored. A special waveform up to 5MHz is produced and sent to the monitored object. The resulting signal form is evaluated with special algorithms, which extract significant parameters of the signal, and transmitted via CAN-bus.

: http://publica.fraunhofer.de/documents/N-29134.html