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Proceedings Paper

Comparison of analog and digital correlation methods suitable for ultrasonic structural health and load monitoring based on high temporal resolution
Author(s): Gerhard Birkelbach; Wolfgang Grill
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Paper Abstract

Ultrasonic load and structural health monitoring schemes, based on high temporal resolution of the transport times of ultrasound, have lately been refined such that the achievable temporal resolution can reach 1 ps even for center frequencies in the lower MHz-regime. Whereas this technique was initiated with signal processing based on digitization and subsequent correlation by software controlled digital processing of the data, equipment has lately been designed and manufactured, allowing rather universal processing of low level analog signals by analog based correlations, employing digital references converted to respective analog signals. The signal and data processing schemes are presented and illustrated with experimental results. The advantages and disadvantages of both methods are discussed, including the limiting effects concerning restrictions given by technological and theoretical aspects. Basic features are demonstrated based on the actually developed and adapted instrumentation including software based operations for both principles of signal and data processing. Even though these methods are also used in ultrasonic imaging, the range of applications presented here focuses dominantly on ultrasonic structural health and load monitoring with bulk and guided acoustic waves.

Paper Details

Date Published: 28 March 2012
PDF: 8 pages
Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 834802 (28 March 2012); doi: 10.1117/12.914966
Show Author Affiliations
Gerhard Birkelbach, Univ. Leipzig (Germany)
Wolfgang Grill, Univ. Leipzig (Germany)

Published in SPIE Proceedings Vol. 8348:
Health Monitoring of Structural and Biological Systems 2012
Tribikram Kundu, Editor(s)

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