Influence of Propagation Distance on Characteristic Parameters of Acoustic Emission Signals in Concrete Materials Based on Low‐Frequency Sensor

Abstract

Acoustic emission is a nondestructive testing technology based on the propagation of transient elastic waves captured by acoustic emission sensors. The acoustic emission signal depends not only on the distance and quality of the propagation path of the transient elastic wave but also on the sensitivity and frequency bandwidth of the receiving sensor that converts the transient elastic wave into a voltage signal. The frequency range of damage signals in concrete materials is generally in the low-frequency band. If high-frequency sensors are used, the low sensitivity to low-frequency signals will cause measurement errors, while the bandwidth of general commercial acoustic emission sensors is relatively narrow. Therefore, a high-sensitivity, low-frequency acoustic emission sensor is proposed, whose bandwidth is almost four times that of commercial sensors. Based on the customized sensor, we quantitatively analyzed the influence of propagation distance on the characteristic parameters of acoustic waves propagating in concrete. The results show that the different propagation modes of acoustic waves in concrete have different attenuation with the propagation distance, related to the position relationship between the acoustic source and the sensor and the propagation path and path quality. This result gives us a better understanding of the propagation mechanism of acoustic emission signals in concrete materials.

Research on Corrosion Detection Method of Oil Tank Bottom Based on Acoustic Emission Technology

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Research on a Corrosion Detection Method for Oil Tank Bottoms Based on Acoustic Emission Technology

“…AE technology is widely used in engineering fields such as storage tanks, pipelines, rock formations and bridges, and its development cannot be separated from the construction of theoretical models [13][14][15][16][17]. The bottom of an oil tank can be regarded as a two-dimensional circular plate, as shown in Figure 2.…”

Attenuation characteristics of concrete using smart aggregate transducers: Experiments and numerical simulations of P-wave propagation

“…Ramaniraka et al (2019) pointed out that the primary cause of these phenomena was the increase in elastic wave attenuation with increasing impedance mismatch between two materials. Liu et al (2022) discovered that different propagation modes of sound waves in concrete exhibited varying levels of attenuation, which were influenced by the positions of the sound source and sensor, propagation paths, and path quality. Although some works have established the attenuation law inside concrete using smart aggregates, they have solely focused on detecting the distance-amplitude relationship inside the concrete, overlooking the attenuation coefficients in propagation paths with diverse conditions.…”