Non destructive monitoring of civil engineering structures by using time frequency representation

Lamonaca, Francesco; Carrozzini, Antonio

doi:10.1109/idaacs.2009.5343011

Cited by 8 publications

(12 citation statements)

References 5 publications

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“…To reduce the probability of signal loss, the multireceiving transducers and the multi-triggering acquisition modality is proposed in [2], [3]. This last has the effect to reduce the storage memory, also.…”

Section: Introductionmentioning

confidence: 99%

Multi-triggering and signal extraction for acoustic emissions monitoring

Lamonaca

Carnì

Carrozzini

et al. 2014

2014 IEEE Metrology for Aerospace (MetroAeroSpace)

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Acoustic Emission (AE) testing is a common practice in the monitoring of aerospace structures. Multireceiving transducers and multi-triggering acquisition modality are used in the continuous monitoring of AE to overcome the problems of signal loss and to reduce the storage memory. Nevertheless, the stored samples are related to both AE signal and noise. A further reduction of storage memory is proposed in the paper by discarding the noise samples. The goal is ensured by analysis procedure that: (i) extracts the AE signal samples in efficient manner, and (ii) establishes the stop acquisition in adaptive manner without a priori information about the length of the AE signal. Experimental tests assess the effectiveness of the proposed analysis procedure to monitor all the AE events occurring inside concrete specimens, and to reduce the storage memory.

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Section: Introductionmentioning

confidence: 99%

Multi-triggering and signal extraction for acoustic emissions monitoring

Lamonaca

Carnì

Carrozzini

et al. 2014

2014 IEEE Metrology for Aerospace (MetroAeroSpace)

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“…Indeed, although AS allows the simultaneous acquisition of more than one input signals, it permits to set up the trigger condition only on one input channel: the Trigger Input [14].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the problems to store big size of digitalized data, and to acquire only the AE events [14], the triggered acquisition modality was proposed, i.e. only the signals overcoming the noise floor are stored.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission monitoring of damage concrete structures by multi-triggered acquisition system

Lamonaca

Carrozzini

Grimaldi

et al. 2012

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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The paper deals with the damage monitoring of concrete material structures by analysing the crack evolution by means of Acoustic Emission (AE). This analysis requires multi transducers, high sampling frequency and long time of observation. Triggered acquisition modality needs to avoid the saving of big size digitalized data. Due to the propagation in the concrete, the AE reduces its amplitude during the path, and, consequently, some events can be loosed due to the intensity lower than the trigger level. The proposal consists in the introduction of the Flat Amplifier and Trigger generator block (FAT) in order to generate a logical trigger when the AE is detected by one of the transducers. The experimental validation to assess the effectiveness of the acquisition system set up is performed according with the standard for AE in the concrete.

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“…2 shows the multi-triggering architecture pointed out by the FAT block. The output voltage of each transducer is connected to the input of the FAT and amplified with a flat transfer characteristic in the range from 9 kHz to 300 kHz [10,12]. Successively, each amplified voltage signal is compared with the threshold level set by the operator according to the noise floor.…”

Section: Acquisition System Architecture By Using Fatmentioning

confidence: 99%

“…1. Owing to the problems of storing a large amount of digitized data, and of acquiring only the AE events [12], the triggered acquisition modality is used, i.e. only the signals overcoming the noise floor are stored.…”

Section: Introductionmentioning

confidence: 99%

Improved Accuracy of Damage Index Evaluation in Concrete Structures by Simultaneous Hardware Triggering

Lamonaca¹,

Carrozzini²,

Grimaldi³

et al. 2014

Metrology and Measurement Systems

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Non-invasive damage monitoring of concrete structures by means of Acoustic Emission (AE) requires multitransducers, multi-channel acquisition, high sampling frequency and long observation time. Owing to its propagation in concrete, the signal from AE reduces its amplitude during the propagation, and, consequently, some events can be lost due to lower signal intensity than the trigger level set on one sensor only. The innovative proposal discussed in the paper consists in the introduction of a Flat Amplifier and Trigger generator block (FAT) in order to generate a logical trigger when the AE is detected by any transducer. Experimental tests confirm the effectiveness of the FAT to acquire all the AE events and to increase the evaluation accuracy of damage indexes.

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Non destructive monitoring of civil engineering structures by using time frequency representation

Cited by 8 publications

References 5 publications

Multi-triggering and signal extraction for acoustic emissions monitoring

Multi-triggering and signal extraction for acoustic emissions monitoring

Acoustic emission monitoring of damage concrete structures by multi-triggered acquisition system

Improved Accuracy of Damage Index Evaluation in Concrete Structures by Simultaneous Hardware Triggering

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