28 March 2012 Comparison of analog and digital correlation methods suitable for ultrasonic structural health and load monitoring based on high temporal resolution
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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.
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Gerhard Birkelbach, Wolfgang Grill, "Comparison of analog and digital correlation methods suitable for ultrasonic structural health and load monitoring based on high temporal resolution", Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 834802 (28 March 2012); doi: 10.1117/12.914966; https://doi.org/10.1117/12.914966
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KEYWORDS
Analog electronics

Digital signal processing

Signal processing

Signal detection

Ultrasonics

Data processing

Homodyne detection

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