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acoustic Non-Destructive Testing Technology in Concrete Bridge Inspection and Pile Foundation detection

Journal of Architectural Research and Development 2024年第1期8卷 20-25页

作者： Wei Fu China Merchants Chongqing Highway Engineering Testing Center Co. Ltd.Chongqing 400060China

This article takes the actual construction project of a certain concrete bridge project as an example to analyze the application of acoustic non-destructive testing technology in its detection.It includes an overview of a certain bridge construction project studied and acoustic non-destructive testing technology and the application of acoustic non-destructive testing technology in actual testing.This analysis hopes to provide some guidelines for acoustic non-destructive testing of modern concrete bridge projects.

关键词： Concrete bridge Bridge detection acoustic detection Non-destructive testing technology

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Wave‑Shaped Piezoelectric Nanofber Membrane Nanogenerator for acoustic detection and Recognition

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Advanced Fiber Materials 2021年第6期3卷 368-380页

作者： Fan Xu Jiang Yang Ruizhi Dong Hanxiao Jiang Conghuan Wang Weilin Liu Zaixiu Jiang Xiaoqing Zhang Guodong Zhu Department of Materials Science Fudan UniversityShanghai 200433China Institute of acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Key Laboratory of Special Artifcial Microstructure Materials and Technology School of Physics Science and EngineeringTongji UniversityShanghai 200092China

With the rapid development of internet of things and wearable electronics,how to conveniently power uncountable sensors remains a huge challenge.Energy harvesting strategy is suggested to collect and convert environmental energies into electrical energy.Thereinto,piezoelectric polymers are utilized as fexible harvesters to convert mechanical energy.The latter widely distributes in both our daily life and industrial environment.Intrinsic piezoelectric property further drives piezoelectric polymers to construct fexible self-powered strain sensors.However,relatively low piezoelectric performance restricts their application in detection and conversion of weak mechanical excitations.Herein,wave-shaped 3D piezoelectric device was fabricated by embossing electrospun polyvinylidene fuoride nanofbers.This 3D structured device presents better longitudinal and transverse piezoelectric performance than usual fat-type one.This wave-shaped piezoelectric device was developed for acoustic detection and recognition with a frequency resolution better than 0.1 Hz.This wave-shaped device was capable of frequency spectrum analyses of various sound sources from human and animals and well presents its potential for future wearable acoustic sensors and transducers.

关键词： Piezoelectric polymer PVDF Wave-shaped device acoustic detection

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Ultrasensitive broadband position-sensitive detector based on graphitic carbon nitride

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Nano Research 2023年第1期16卷 1277-1285页

作者： Xuexia Chen Xun Yang Qing Lou Yongzhi Tian Zhiyu Liu Chaofan Lv Yancheng Chen Lin Dong Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

As a typical two-dimensional material,graphitic carbon nitride(g-CN)has attracted great interest because of its distinctive electronic,optical,and catalytic properties.However,the absence of a feasible route toward large-area and high-quality films hinders its development in optoelectronics.Herein,high-quality g-CN films have been grown on Si substrate via a vapor-phase transport-assisted condensation method.The g-CN/Si heterojunction shows an obvious response to ultraviolet–visible-near infrared photons with a responsivity of 133 A·W−1,which is two orders of magnitude higher than the best value ever reported for g-CN photodetectors.A position-sensitive detector(PSD)has been developed using the lateral photovoltaic effect of the g-CN/Si heterojunction.The PSD shows a wide response spectrum ranging from 300 to 1,100 nm,and a position sensitivity and rise/decay time of 395 mV·mm−1 and 3.1/50μs,respectively.Moreover,the application of the g-CN/Si heterojunction photodetector in trajectory tracking and acoustic detection has been realized for the first time.This work unveils the potential of g-CN for large-area photodetectors,and prospects for their applications in trajectory tracking and acoustic detection.

关键词： graphitic carbon nitride(g-CN) position-sensitive detector(PSD) lateral photovoltaic effect(LPE) heterojunction trajectory tracking acoustic detection

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A SPATIAL IMPULSE RESPONSE BASED MODEL FOR THE acoustic FIELD IN detection OF BURIED OBJECTS WITH LOW FREQUENCY WAVES

A SPATIAL IMPULSE RESPONSE BASED MODEL FOR THE ACOUSTIC FIEL...

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第三届全国压电和声波理论及器件技术研讨会

作者： Hui-feng XU,Yan-ling QIAN College of Mechatronics Engineering and Automation,National University of Defense Technology,Changsha 410073,China

A number of mathematical models have been developed and used for received signal processing in acoustic detection of buried objects with low frequency waves up to now.Most of them are linear combination of signals and impulses of the system.They are too simple to make in-depth analysis of the parameters of the system.Then,a spatial impulse response based model is proposed for the acoustic detection system,which is derived from the basic theory of sound propagation and geometrical relation of the system.And the physical meaning of the model is explicit.In this way,the model can be applied to predict and determine the parameters of the detection system,and it is the basic theory in signal processing of the system.The simulated results and the measured received signals are compared,and it is shown that the simulated and measured results are in good agreement.

关键词： Spatial impulse response acoustic detection direct wave reflected wave

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Research on acoustic Localization Algorithm Based on Dual Four-Element Arrays

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Journal of Beijing Institute of Technology 2009年第1期18卷 51-55页

作者：王亚斌贾晶晶刘明杰 School of Aerospace Science and Engineering Beijing Institute of Technology

The passive acoustic locating technology is widely used in military fields. The traditional locating method with single array has low precision of distance estimation, but comparatively high precision of angle estimation. According to the characteristic, the algorithm for acoustic passive localization based on the azimuth angle and geometry position of the two arrays is derived to estimate the target distance, and the simulation for the factors that affect the localization precision also proceeds. The result of the simulation shows the precision of localization estimation with dual arrays is superior to that of single array, and the passive localization algorithm based on dual array can meet the practical demands.

关键词： acoustic detection acoustic passive localization array error

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acoustic Signal Feature Extraction of Vehicle Targets

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Tsinghua Science and Technology 2002年第3期7卷 291-293页

作者：蓝金辉马宝华李科杰 Department of Precision Instruments and Mechanology Tsinghua University Beijing 100084 China School of Mechano-Electronics Engineering Beijing Institute of Technology Beijing 100081 China

acoustic signal feature extraction is an important part of target recognition. The mechanisms for producing acoustic signals and their propagation are analyzed to extract the features of the radiated noise from different targets. Analysis of the acoustic spectra of typical vehicle targets acquired outdoors shows that the vehicles can be classified based on the acoustic spectra and amplitudes.

关键词： acoustic detection feature extraction signal processing

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