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.
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.
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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