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- W2034236056 abstract "Monitoring of fatigue cracking in bridges using a combined passive and active scheme hasbeen approached by the authors. Passive Acoustic Emission (AE) monitoring has shown to be able todetect crack growth behavior by picking up the stress waves resulting from the breathing of cracks whileactive ultrasonic pulsing can quantitatively assess structural integrity by sensing out an interrogatingpulse and receive the structural reflections from the discontinuity. In this paper, we present acomparative study of active and passive sensing with two types of transducers: (a) AE transducers, and(b) embeddable piezoelectric wafer active sensors (PWAS). The study was performed experimentally onsteel plates. Both pristine and damaged (notched) conditions were considered. For active sensing, pitchcatchconfiguration was examined in which one transducer was the transmitter and another transduceracted as the receiver. The ping signal was generated by the AE hardware/software package AEwin. Forpassive sensing, 0.5-mm lead breaks were executed both on top and on the edge of the plate. Thecomparative nature of the study was achieved by having the AE and PWAS transducers placed on thesame location but on the opposite sides of the plate. The paper presents the main findings of this studyin terms of (a) signal strength; (b) signal-to-noise (S/N) ratio; (c) waveform clarity; (d) waveformFourier spectrum contents and bandwidth; (e) capability to detect and localize AE source; (f) capabilityto detect and localize damage. The paper performs a critical discussion of the two sensingmethodologies, conventional AE transducers vs. PWAS transducers." @default.
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- W2034236056 date "2012-04-26" @default.
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- W2034236056 title "Comparative study of active and passive sensing with AE and PWAS transducers" @default.
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- W2034236056 doi "https://doi.org/10.1117/12.915670" @default.
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