Experimental Study of a Broadband Parametric Acoustic Array for Sub‐Bottom Profiling in Shallow Water

Qu, Ke; Zou, Binbin; Jingjing, Chen; Guo, Yin; Wang, Runtian

doi:10.1155/2018/3619257

Cited by 9 publications

(3 citation statements)

References 26 publications

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“…When the stress on the bottom of the oil tank changes, the measured defect site will generate continuous or discontinuous AE signals. Information about the location of AE signals can be acquired by obtaining the distance and time taken for the signals to reach three or more AE sensors [18][19][20][21][22]. Assuming the signal transmitted from the defect position reaches sensor i after t i , and the transmission speed of sound in the tank bottom plate is v, the following formula can be obtained:…”

Section: Mathematical Modeling Of Ae Detectionmentioning

confidence: 99%

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

Hua,

Chen,

Zhao

et al. 2024

Sensors

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This paper presents an acoustic emission (AE) detection method for refined oil storage tanks which is aimed towards specialized places such as oil storage tanks with high explosion-proof requirements, such as cave oil tanks and buried oil tanks. The method utilizes an explosion-proof acoustic emission instrument to detect the floor of a refined oil storage tank. By calculating the time difference between the defective acoustic signal and the speed of acoustic wave transmission, a mathematical model is constructed to analyze the detected signals. An independent channel AE detection system is designed, which can store the collected data in a piece of independent explosion-proof equipment, and can analyze and process the data in a safe area after the detection, solving the problems of a short signal acquisition distance and the weak safety protection applied to traditional AE instruments. A location analysis of the AE sources is conducted on the bottom plate of the tank, evaluating its corrosion condition accurately. The consistency between the evaluation and subsequent open-tank tests confirms that using AE technology effectively captures corrosion signals from oil storage tanks’ bottoms. The feasibility of carrying out online inspection under the condition of oil storage in vertical steel oil tanks was verified through a comparison with open inspections, which provided a guide for determining the inspection target and opening order of large-scale oil tanks.

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Section: Mathematical Modeling Of Ae Detectionmentioning

confidence: 99%

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

Hua,

Chen,

Zhao

et al. 2024

Sensors

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“…They present an updated overview of the topic, with a particular section on broadband parametric arrays, for which the nonlinear self-demodulation effect applies to the broadband primary signals. A special interest is drawn on some applications, like sub-bottom profiler and buried targets [20,21], underwater communications and long-range ocean research [22,23]. In 2022, the PAA is used to improve the results obtained in elastographic imaging [24].…”

Section: Of 11mentioning

confidence: 99%

A Numerical Study on the Penetrability and Directivity of the Difference-Frequency Component Beam in Bubbly Liquids Obtained via Parametric Acoustic Array

Tejedor Sastre,

Vanhille

2024

Preprint

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The penetrability and directivity of ultrasound in different media is of interest in engineering and medical applications (imaging, nondestructive testing, sonochemistry, among others). The nonlinearity of a liquid can be used in the parametric antenna framework to generate low-frequency components with particular features from several ultrasonic signals at the source. Bubbly liquids are dispersive liquids in which a small amount of tiny gas bubbles leads to the increase of the nonlinear parameter of the media over certain frequency ranges. Parametric antenna applied to this huge nonlinear media gives rise to low-frequency components with relatively small intensity at the source. The evolution of a low-frequency component (difference-frequency component obtained from two primary signals) during its propagation in a bubbly liquid is somehow unknown. It is thus interesting to analyse its characteristics to establish whether this component can benefit from the quality of its own frequency and from the primary frequencies in terms of directivity and penetrability into the medium. It must be noted that no such study in bubbly liquids exists in the litterature, but only for homogeneous media. To this end, several numerical models developed previously are used here to analyse the difference-frequency component obtained from a parametric antenna emitting from two ultrasonic signals at the source in one and two-dimensional domains. These models allow us to observe the behavior of this frequency component. An angle that measures the directivity of a beam is also defined. Our results show a point hardly found in the literature: the high directivity and the huge penetrability of the secondary beam associated to the difference-frequency component into the bubbly liquid, compared to the same frequency signal excited directly from the source in the bubbly liquid and to the parametric acoustic array in homogeneous fluids.

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“…The most mature application of the PAA is the sub-bottom profiler [52][53][54]. Chirp sub-bottom profiler is widely used in the field of traditional acoustic detection [55,56], because Chirp sonar transmits LFM signals with broad bandwidth which carry a lot of information about the submarine stratum.…”

Section: Parametric Array Sub-bottom Profilermentioning

confidence: 99%

Parametric Acoustic Array and Its Application in Underwater Acoustic Engineering

Zhou

Huang

2020

Sensors

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As a sound transmitting device based on the nonlinear acoustic theory, parametric acoustic array (PAA) is able to generate high directivity and low frequency broadband signals with a small aperture transducer. Due to its predominant technical advantages, PAA has been widely used in a variety of application scenarios of underwater acoustic engineering, such as sub-bottom profile measurement, underwater acoustic communication, and detection of buried targets. In this review paper, we examine some of the important advances in the PAA since it was first proposed by Westervelt in 1963. These advances include theoretical modelling for the PAA, signal processing methods, design considerations and implementation issues, and applications of the PAA in underwater acoustic engineering. Moreover, we highlight some technical challenges which impede further development of the PAA, and correspondingly give a glimpse on its possible extension in the future. This article provides a comprehensive overview of some important works of the PAA and serves as a quick tutorial reference to readers who are interested to further explore and extend this technology, and bring this technology to other application areas.

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Experimental Study of a Broadband Parametric Acoustic Array for Sub‐Bottom Profiling in Shallow Water

Cited by 9 publications

References 26 publications

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

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

A Numerical Study on the Penetrability and Directivity of the Difference-Frequency Component Beam in Bubbly Liquids Obtained via Parametric Acoustic Array

Parametric Acoustic Array and Its Application in Underwater Acoustic Engineering

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