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Applications of Ultrasonic Detection Technology in Bridge Concrete Pile Foundation Detection
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作者 Wei Fu 《Journal of World Architecture》 2023年第6期45-50,共6页
In this paper,the application strategy of ultrasonic detection technology in the detection of concrete foundation piles is analyzed using a construction project as an example.It includes a basic overview of the projec... In this paper,the application strategy of ultrasonic detection technology in the detection of concrete foundation piles is analyzed using a construction project as an example.It includes a basic overview of the project,an overview of ultrasonic testing technology in bridge concrete pile foundation testing,and an analysis of its practical application in the concrete pile foundation testing of this project.The objective of this analysis is to provide some reference for the application of ultrasonic testing technology and the improvement of the quality of bridge concrete pile foundation testing. 展开更多
关键词 Bridge engineering Concrete pile foundation ultrasonic detection technology ultrasonic detection principle
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Study on the concentrated SF_6 quantitative intelligent ultrasonic detection system 被引量:1
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作者 朱昌平 Bian Mangxi +2 位作者 Shan Minglei Yin Dongmei Yu Hongzhen 《High Technology Letters》 EI CAS 2010年第4期378-382,共5页
In order to realize on-line quantitative detection on SF6 and effective control of nlnning state of SF6 high voltage power supply system, a concentrated SF6 quantitative ultrasonic on-line deteetion system has been de... In order to realize on-line quantitative detection on SF6 and effective control of nlnning state of SF6 high voltage power supply system, a concentrated SF6 quantitative ultrasonic on-line deteetion system has been developed based on the actual demand of electric power system consumers. There are four major characteristics in this system. Firstly, the gas of maximum 64 detection points is transferred through the specific air path to the detection devices to he detected and analyzed, thereby the electrical lines and the complicated installation of the collectors can be avoided; secondly, the differential technique is used to shield the influence of environmental factors, which effectively improves the accuracy of the acoustic detection; thirdly, the SF6 coneentration is determined by the speed and phase in the ultrasonic wave trans- mission process, therefore there is no secondary pollution for the purely physical means; finally, the ma- ture embedded technique is applied in this system to improve its intelligence and stability. 展开更多
关键词 ultrasonic detection concentrated SF6 embedded technique
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Fast recognition algorithm of underwater micro-terrain based on ultrasonic detection
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作者 罗柏文 周知进 +1 位作者 卜英勇 赵海鸣 《Journal of Central South University of Technology》 EI 2008年第5期738-741,共4页
An algorithm was proposed to fast recognize three types of underwater micro-terrain, i.e. the level, the gradient and the uneven. With pendulum single beam bathymeter, the hard level concrete floor, the random uneven ... An algorithm was proposed to fast recognize three types of underwater micro-terrain, i.e. the level, the gradient and the uneven. With pendulum single beam bathymeter, the hard level concrete floor, the random uneven floor and the gradient wood panel (8-) were ultrasonically detected 20 times, respectively. The results show that the algorithm is right from fact that the first clustering values of the uneven are all less than the threshold value of 60.0% that is obtained by the level and gradient samples. The algorithm based on the dynamic clustering theory can effectively eliminate the influences of the exceptional elevation values produced by the disturbances resulted from the grazing angle, the characteristic of bottom material and environmental noises, and its real-time capability is good. Thus, the algorithm provides a foundation for the next restructuring of the micro-terrain. 展开更多
关键词 underwater micro-terrain ultrasonic detection single beam exceptional elevation values threshold value dynamic clustering
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Rail Internal Defect Detection Method Based on Enhanced Network Structure and Module Design Using Ultrasonic Images
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作者 Fupei Wu Xiaoyang Xie Weilin Ye 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2023年第6期277-288,共12页
Improving the detection accuracy of rail internal defects and the generalization ability of detection models are not only the main problems in the field of defect detection but also the key to ensuring the safe operat... Improving the detection accuracy of rail internal defects and the generalization ability of detection models are not only the main problems in the field of defect detection but also the key to ensuring the safe operation of high-speed trains.For this reason,a rail internal defect detection method based on an enhanced network structure and module design using ultrasonic images is proposed in this paper.First,a data augmentation method was used to extend the existing image dataset to obtain appropriate image samples.Second,an enhanced network structure was designed to make full use of the high-level and low-level feature information in the image,which improved the accuracy of defect detection.Subsequently,to optimize the detection performance of the proposed model,the Mish activation function was used to design the block module of the feature extraction network.Finally,the pro-posed rail defect detection model was trained.The experimental results showed that the precision rate and F1score of the proposed method were as high as 98%,while the model’s recall rate reached 99%.Specifically,good detec-tion results were achieved for different types of defects,which provides a reference for the engineering application of internal defect detection.Experimental results verified the effectiveness of the proposed method. 展开更多
关键词 ultrasonic detection Rail defects detection Deep learning Enhanced network structure Module design
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Ultrasonic detection of interface in multilayers: Theory and adaptive noise canceling 被引量:5
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作者 JIAN Xiaoming LI Mingxuan ZHANG Jiansheng (Institute of Acoustics, Chinese Academg of Sciences Beijing 100080) 《Chinese Journal of Acoustics》 1999年第3期280-288,共9页
The analytic expression of the received echo in multilayers NDT (Non-Destruction Evaluation) is derived. Then based on the analytic solution, interface signals are analyzed; and it is concluded that the received u... The analytic expression of the received echo in multilayers NDT (Non-Destruction Evaluation) is derived. Then based on the analytic solution, interface signals are analyzed; and it is concluded that the received ultrasonic echo of mulilayers is composed of all the interface signals. By using the adaptive canceling of the signals from interfaces 0 and 1, the signals from interface 2 can be extracted. The method is applied to simulated and real echoes of multilayers,and the signals from interface 2 is separated successfully Based on the amplitude and arrival time of the signal from interface 2, the bond quality and depth of the interface can be evaluated 展开更多
关键词 ultrasonic detection of interface in multilayers NDE Theory and adaptive noise canceling
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Application of subband adaptive filtering techniques to ultrasonic detection in multilayers 被引量:2
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作者 MAO Jie LI Mingxuan(Institute of Acoustics, The Chinese Academy of Sciences Beijing 100080) 《Chinese Journal of Acoustics》 2003年第1期41-49,共9页
The ultrasonic testing for the defects of complete disbond in multi-layered structure with lower acoustic impedance beneath a high acoustic impedance overburden is one of the difficult problems in ultrasonic nondestru... The ultrasonic testing for the defects of complete disbond in multi-layered structure with lower acoustic impedance beneath a high acoustic impedance overburden is one of the difficult problems in ultrasonic nondestructive testing field. A model of a multi-layered steel-rubber composite plate is depicted. Because the acoustic impedance of the steel differs far from that of the couplant water and the rubber, the energy of the signal reflected from the debonded rubber layers is very weak. More over, the flaw echoes are masked by the strong echoes reverberated in the steel plate. It's nearly impossible to identify the debonding echoes directly. The subband adaptive filtering method is discussed in the paper, where the subband decomposition is performed by mutual wavelet packets decomposition on the criterion of maximizing the cross-correlation between the signals. The simulations on both synthetic and real signals are presented. The echoes from the delaminated flaw at the depth of 5 mm in the rubber from the calculated signal, and echoes from the flaw at the depth of 3 mm from the real signal are extracted successfully. 展开更多
关键词 of on IS IT Application of subband adaptive filtering techniques to ultrasonic detection in multilayers in
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Theoretical and Experimental Investigation of Fiber Bragg Gratings With Different Lengths for Ultrasonic Detection 被引量:1
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作者 Zhouzhou YU Qi JIANG +1 位作者 Hao ZHANG Junjie WANG 《Photonic Sensors》 SCIE EI CAS CSCD 2016年第2期187-192,共6页
In this paper, the response of fiber Bragg gratings (FBGs) subjected to the ultrasonic wave has been theoretically and experimentally investigated. Although FBG sensors have been widely used in the ultrasonic detect... In this paper, the response of fiber Bragg gratings (FBGs) subjected to the ultrasonic wave has been theoretically and experimentally investigated. Although FBG sensors have been widely used in the ultrasonic detection for practical structural health monitoring, the relationship between the grating length and ultrasonic frequency is not yet to be obtained. To address this problem, an ultrasound detection system based on FBGs is designed and the response sensitivity of different lengths gratings are detected. Experimental results indicate that the grating with 3 mm length has a higher sensitivity when detecting high frequency ultrasonic wave, and the amplitude can be up to 0.6 mV. The 10 mm length grating has better detection sensitivity for low frequency ultrasonic wave and the amplitude is 0.8 mV. The results of this analysis provide useful tools for high sensitivity ultrasound detection in damage detection systems. 展开更多
关键词 FBG nondestructive testing ultrasonic detection
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Characteristics of the propagation of partial discharge ultrasonic signals on a transformer wall based on Sagnac interference 被引量:3
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作者 Jun JIANG Kai WANG +2 位作者 Xuerui WU Guoming MA Chaohai ZHANG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2020年第2期10-18,共9页
The acoustic emission(AE)method has been widely recognized for the detection of incipient insulation fault phenomenon(partial discharge,PD)in power transfomiers,nevertheless,the installation and placement of AE sensor... The acoustic emission(AE)method has been widely recognized for the detection of incipient insulation fault phenomenon(partial discharge,PD)in power transfomiers,nevertheless,the installation and placement of AE sensors should be taken into full consideration.In this manuscript,a three-dimensional multiphysics model was established and simulated to research the characteristics of the propagation in the transformer wall.Furthermore,a piezoelectric transducer was used to detect PD ultrasonic signals and verify the simulation results in the laboratory.To ensure the accuracy of the detection,an optical fiber sensor based on the Sagnac interference principle was designed and adopted.The variation of the amplitude of the ultrasonic signal with distance reveals the characteristics of the ultrasonic signal propagating in the transformer wall.The distribution of sound pressure on the upper and lower surfaces of the simulation model proved that ultrasonic waves propagate in the form of symmetrical Lamb waves in the transformer wall.Moreover,the amplitude of the AE attenuates due to absorption and refraction loss,and local fluctuations on account of acoustic interference.Thus,a stable signal detected by an AE sensor does not represent the absence of PD in a transfomier.To improve the reliability of AE detection,it is proposed in this manuscript that repeated movement of the AE sensor is necessary to obtain a suitable measurement position.Similarly,it is necessary to adjust the position of the AE sensor in order to locate the PD source well.In addition,this study is expected to provide a theoretical analysis and a fiber sensor to address the problem of sensor placement in AE detection. 展开更多
关键词 partial discharge power transformer ultrasonic detection optical fiber Sagnac interference
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Evaluation of echo features of ultrasonic flaws and its intelligent pattern recognition 被引量:1
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作者 刚铁 吴林 《China Welding》 EI CAS 1997年第1期22-27,共6页
In this paper, three types of weld flaw were taken as target, evaluation and recognition of flaw echo features were studied. On the basis of experimental study and theoretical analysis, 26 features have been extracted... In this paper, three types of weld flaw were taken as target, evaluation and recognition of flaw echo features were studied. On the basis of experimental study and theoretical analysis, 26 features have been extracted from each echo samples. A method which is based on the xtatislical hypothesis testing and used for feature evaluation and optimum subset selection was explored. Thus, the dimensionality reduction of feature space was brought out, and simultaneously the amount of calculation was decreased. An intelligent pattern classifier with B-P type neural network was constructed which was characterized by high speed and accuracy for learning. Using a half of total samples as training set and others as testing set, the learning efficiency and the classification ability of network model were studied. The results of experiment showed that the learning rate of different training samples was about 100%. The results of recognition was satisfactory when the optimum feature subset was taken as the sample's feature vectors. The average recognition rate of three type flaws was about 87.6%, and the best recognition rate amounted to 97%. 展开更多
关键词 ultrasonic detection feature analysis pattern recognition
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DETECTION OF LONGITUDINAL DEFECT IN PIPES USING TORSIONAL MODES 被引量:7
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作者 LIU Zenghua WU Bin HE Cunfu YANG Shiming WANG Xiuyan 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第1期146-150,共5页
The multi-modes and disperse characteristics of torsional modes in pipes are investigated theoretically and experimentally. At all frequencies, both phase velocity and group velocity of the lowest torsional mode T(0,... The multi-modes and disperse characteristics of torsional modes in pipes are investigated theoretically and experimentally. At all frequencies, both phase velocity and group velocity of the lowest torsional mode T(0,1) are constant and equal to shear wave velocity. T(0,1) mode at all frequencies is the fastest torsional mode. In the experiments, T(0,1) mode is excited and received in pipes using 9 thickness shear vibration mode piezoelectric ceramic elements. Furthermore, an artificial longitudinal defect of a 4 m long pipe is detected using T(0,1) mode at 50 kHz. Experimental results show that it is feasible for longitudinal defect detection in pipes using T(0,1) mode of ultrasonic guided waves. 展开更多
关键词 Torsional mode Pipe Longitudinal defect detection ultrasonic guided waves
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Detection of butt weld of laser-MIG hybrid welding of thin-walled profile for high-speed train
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作者 Qingxiang Zhou Fang Liu +3 位作者 Jingming Li Jiankui Li Shuangnan Zhang Guixi Cai 《Railway Sciences》 2022年第1期98-113,共16页
Purpose–This study aims to solve the problem of weld quality inspection,for the aluminum alloy profile welding structure of high-speed train body has complex internal shape and thin plate thickness(2–4 mm),the conve... Purpose–This study aims to solve the problem of weld quality inspection,for the aluminum alloy profile welding structure of high-speed train body has complex internal shape and thin plate thickness(2–4 mm),the conventional nondestructive testing method of weld quality is difficult to implement.Design/methodology/approach–In order to solve this problem,the ultrasonic creeping wave detection technology was proposed.The impact of the profile structure on the creeping wave detection was studied by designing profile structural test blocks and artificial simulation defect test blocks.The detection technology was used to test the actual welded test blocks,and compared with the results of X-ray test and destructive test(tensile test)to verify the accuracy of the ultrasonic creeping wave test results.Findings–It is indicated that that X-ray has better effect on the inspection of porosities and incomplete penetration defects.However,due to special detection method and protection,the detection speed is slow,which cannot meet the requirements of field inspection of the welding structure of aluminum alloy thin-walled profile for high-speed train body.It can be used as an auxiliary detection method for a small number of sampling inspection.The ultrasonic creeping wave can be used to detect the incomplete penetration welds with the equivalent of 0.25 mm or more,the results of creeping wave detection correspond well with the actual incomplete penetration defects.Originality/value–The results show that creeping wave detection results correspond well with the actual non-penetration defects and can be used for welding quality inspection of aluminum alloy thin-wall profile composite welding joints.It is recommended to use the echo amplitude of the 10 mm 30.2 mm 30.5 mm notch as the criterion for weld qualification. 展开更多
关键词 High-speed train Aluminum alloy profile Laser-MIG hybrid welding Nondestructive inspection X-ray radiography ultrasonic creeping wave detection
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Antenatal Diagnosis and Outcome of 12 Congenital Cystic Adenomatoid Malformation of Lung 被引量:1
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作者 Xue-lian LI Yu-qing ZHOU +2 位作者 Jue-hua ZHANG Ying-liu YAN Xiao-tian LI 《Journal of Reproduction and Contraception》 CAS 2007年第4期289-295,共7页
Objective To investigate the ultrasonic detection probability, type, prenatal diagnosis, and outcome of congenital cystic adenomatoid malformation of lung (CCAM). Methods In this retrospective study, all 12 cases wh... Objective To investigate the ultrasonic detection probability, type, prenatal diagnosis, and outcome of congenital cystic adenomatoid malformation of lung (CCAM). Methods In this retrospective study, all 12 cases which were diagnosed with suspected prenatal CC,4M over the period in the hospital were analyzed. Information on diagnosis time, types and progression of the lesions during pregnancy, the additional abnormalities, and the outcome of pregnancies were recorded.Results The positive rate of ultrasonic detection of CCAM was about 1.01‰ (1/11 124) before 28 gestation weeks. There were 1 case of type Ⅰ (8%), 2 cases of type Ⅱ (17%) and 9 cases of type Ⅲ (75%). Nine pregnancies were terminated and 2 cases were confirmed by pathology. Three neonates were alive and without any symptom now. Conclusions Type Ⅲ is the major type. Ultrasound examination during 20-28 weeks and following up, prenatal consultation, chromosome examination offetus, delivery with a pediatrician standing by, and all suspected neonates being investigated are recommended. 展开更多
关键词 congenital cystic adenomatoid malformation of lung ultrasonic detection TYPE prenatal diagnosis OUTCOME
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Fuzzy detection for ultrasonic flaw inspectionof highly scattering materials 被引量:6
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作者 LIU Zhenqing and WEI Moan (Institute of Acocustics, Tongji University Shanghai 200092) 《Chinese Journal of Acoustics》 1997年第4期332-338,共7页
Fuzzy logic detection has been applied to the signal enhancement of ultrasonic flaw echoes from the structure noise due to nonflaw related scattering of ultrasound in highly scattering materials. Cross-correlation, ph... Fuzzy logic detection has been applied to the signal enhancement of ultrasonic flaw echoes from the structure noise due to nonflaw related scattering of ultrasound in highly scattering materials. Cross-correlation, phase difference and fractal dimension are used as signal characteristics in fuzzy logic detection. Experimental results show that this new method has better performance than the commonly used correlation detection. 展开更多
关键词 Fuzzy detection for ultrasonic flaw inspectionof highly scattering materials WANG
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Detection of long bones based on Barker code excited ultrasonic guided waves 被引量:5
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作者 ZHANG Huilin SONG Xiaojun TA De'an 《Chinese Journal of Acoustics》 2014年第2期136-146,共11页
Single pulse excited ultrasonic guided wave surfers high attenuation during the propagation in long bones.This results in small amplitude and low signal-to-noise ratio(SNR)of measured signals.Thus,the Barker code ex... Single pulse excited ultrasonic guided wave surfers high attenuation during the propagation in long bones.This results in small amplitude and low signal-to-noise ratio(SNR)of measured signals.Thus,the Barker code excitation is introduced into long bone detection to improve the quality of received signals,due to its efficiency in increasing amplitude and SNR.Both simulation and in vitro experiment were performed,and the results were decoded by the weighted match filter(WMF) and the finite impulse response- least squares inverse filter(FIRLSIF),respectively.The comparison between the results of Barker code excitation and sine pulse excitation was presented.For 13-bit Barker code excitation,WMF produced 13 times larger amplitude than sine pulse excitation,while FIR-LSIF achieved higher peak-sidelobe-level(PSL) of -63.59 dB and better performance in noise suppression.The results show that the Barker code excited guided waves have the potential to be applied to the long bone detection. 展开更多
关键词 CODE detection of long bones based on Barker code excited ultrasonic guided waves FIR
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Laser ultrasonic generation and optical detection and processing 被引量:1
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作者 YE Peide, SHI Jun CHEN Guilin (Shanghai Institute of Technical Physics, Academia Sinica Shanghai 200083) 《Chinese Journal of Acoustics》 1992年第3期237-242,共6页
History, present situation and importancy of the laser-generated ultrasonic technique are presented. Basic principles and some experimental results of laser ultrasonic generation and optical detection and processing a... History, present situation and importancy of the laser-generated ultrasonic technique are presented. Basic principles and some experimental results of laser ultrasonic generation and optical detection and processing are discussed. Several problems about applying this technique to NDT are also discussed in this paper. 展开更多
关键词 Laser ultrasonic generation and optical detection and processing
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Combinatorial cell surface display system in Escherichia coli for noninvasive colorectal cancer detection 被引量:1
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作者 Hsiao Chiayi Fang Qingwei +15 位作者 Zheng Shuyu He Peixiang Zhang Kairan Hong Yirui Ran Yuncong Sun Shiyu Liu Zhixiang Liang Zhihan Zhong Bozitao Wu Weiwen Xia Ruoyu Bai Shihao Yao Kuan Wang Yushu He Lin Ma Gang 《Journal of Bio-X Research》 2019年第4期185-196,共12页
Navigation and recognition of disease lesions remain challenging during colorectal cancer diagnosis and treatment,given that the precision and capacity of using specific surface antigens as recognition sites are relat... Navigation and recognition of disease lesions remain challenging during colorectal cancer diagnosis and treatment,given that the precision and capacity of using specific surface antigens as recognition sites are relatively lacking.Moreover,the low penetration rate of noninvasive detection methods has delayed disease diagnosis in developing countries.We developed a bacterial device targeting the Thomsen-Friedenreich antigen,which is abundant on lesion tissue,and produced vesicles that serve as markers for ultrasonic detection.The device uses a bacterial cell surface display system and acoustic reporter gene to function as a screening device for colorectal cancer detection.The diagnostic efficiency of this device was determined by flow cytometry,immunohistochemistry,microfluidic chip-based assay,and ultrasonic examinations on both cellular and tissue scales.In all scales and experiments,our device showed great feasibility upon differentiating disease lesion and normal tissue,while foundation of the usage of vesicle reporter system as noninvasive method has also been laid.The application of this device provides insight into the practicability and prospect of bacterial detecting agents in the field of diagnostics.All animal studies were approved by the Institutional Animal Care and Use Committee of Shanghai Jiao Tong University,China(approval No.201801015)on February 23,2018. 展开更多
关键词 colorectal cancer cell-surface display ice nucleation protein ultrasonic detection
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Scanning near-field acoustic microscope and its application
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作者 XU Ping,CAI Wei & WANG RongMing Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education) Department of Physics,Beihang University,Beijing 100191,China 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第1期126-130,共5页
Scanning near-field acoustic microscope (SNAM) combines the ultrasonic detection technology with scanning near-field microscopy. The main characteristic of such microscope is that the acoustic wave is produced or de... Scanning near-field acoustic microscope (SNAM) combines the ultrasonic detection technology with scanning near-field microscopy. The main characteristic of such microscope is that the acoustic wave is produced or detected in near-field area whether ultrasonic transducer acts as generator or detector. The resolution of SNAM can reach to nanometer scale. First, two typical SNAMs, scanning electron acoustic Inicroscope and scanning probe acoustic microscope, will be introduced in this paper. The working principle of our homemade SNAM based on a commercial scanning probe microscope will be reported, together with some recent results from this homemade SNAM. 展开更多
关键词 scanning near-field acoustic microscope ultrasonic detection technology scanning probe microscopy
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