Results 131 to 140 of about 6,397,796 (189)

Real-Time Total Focusing Method for Ultrasonic Imaging of Multilayered Object

2018 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2018
In imaging of multilayered object, total focusing method (TFM) combined with ray-tracing appeals to numerous researchers because of its superior image quality. But lots of iterative computation to calculate the incident points greatly increases its processing time.
Wenkai Cui, Kaihuai Qin
openaire   +1 more source

Total Focusing Method With Virtual Sources in the Presence of Unknown Geometry Interfaces

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2016
Auto-focused virtual source imaging (AVSI) has been recently presented as an alternative method for synthetic aperture focusing through arbitrarily shaped interfaces with arrays. This paper extends the AVSI concept to the case of the total focusing method (TFM-AVSI) using several virtual receivers for each virtual source.
Jorge F. Cruza, Jorge Camacho
openaire   +2 more sources

Ultrasonic guided wave array imaging detection of rail defects based on the symbolic coherent factor total focusing method

Nondestructive Testing and Evaluation
Rails have many ultrasonic guided wave modes, which makes it difficult to determine the suitable guided wave mode and its excitation method. In this paper, the dispersion characteristics of guided waves propagated in rails are studied using the semi ...
Wenfa Zhu, Zhengbo Wei, Guopeng Fan, Zaiwei Li, Jichao Xu, W. Qi, Yaohua Mei, Caiyue Zhao   +7 more
semanticscholar   +1 more source

Orientation characterisation of branched crack-like defects in curved components using ultrasonic array vector total focusing method

Nondestructive Testing and Evaluation
Crack orientation is an important characteristic in crack evaluation such as predicting crack growth and measuring crack size. However, the curved surface of a component makes the ultrasonic ray path complicated and seriously affects the crack ...
Duo Lyu, Xiangchao Xiao, Hong-wei Hu, Zhiping Liu, Xiang-hong Wang, N. Xu   +5 more
semanticscholar   +1 more source

The characterisation of surface-breaking crack using ultrasonic total focusing method imaging based on COA-VMD

Nondestructive Testing and Evaluation
The use of ultrasonic total focusing method (TFM) to characterise surface-breaking crack plays a significant role in non-destructive evaluation. It not only provides early detection capability but also offers critical information for the assessment of ...
Jun Tu, Huizhen Wang, Yini Song, Qiao Wu, Xu Zhang, Xiaochun Song   +5 more
semanticscholar   +1 more source

Lamb Wave Based Total Focusing Method for Integral Grid-Stiffened Plate Damage Identification

IEEE Sensors Journal, 2022
The integral grid-stiffened plate is often used as the outer wall structure of spacecraft, which can reduce weight and increase strength. The Lamb wave is often used to detect damage of plate structure due to its advantages of strong penetration and ...
Sunquan Yu, Chengguang Fan, Yong Zhao, Lei Chen, Bin Gao, Lei Yang   +5 more
semanticscholar   +1 more source

Total Focusing Method with Laser-Generated Ultrasonic Waves for Defect Detection in Finite Plates

ASNT 30th Research Symposium Conference Proceedings, 2022
Total Focusing Method (TFM) was employed using laser-generated ultrasonic plate waves. The goal was to assess the feasibility of using this technique for applications where testing constraints necessitate couplant-free, remote, guided-wave conditions ...
Megan E. McGovern, Dmitriy D. Bruder, R. James, V. Gattani   +3 more
semanticscholar   +1 more source

Effects of directivity function on total focusing method imaging performance

2014 IEEE Far East Forum on Nondestructive Evaluation/Testing, 2014
The Total Focus Method (TFM) is a post-processing algorithm which uses all elements in the array to focus in both transmission and reception at every image point. The time-domain signals is captured in a process termed Full Matrix Capture (FMC). In this paper, the main objective is to research the effects of directivity function on the TFM.
null Xiang Zhou, null Jian-ping Peng, null Lin Luo, null Ze-yong Wang, null Xiao-rong Gao   +4 more
openaire   +1 more source

Fast Total Focusing Method Based On Elliptical Arc Scanning algorithm and OpenCL Acceleration

2024 6th International Conference on Intelligent Control, Measurement and Signal Processing (ICMSP)
Total focusing method (TFM), as the most effective post-processing technique for ultrasonic phased array imaging currently, can achieve focusing at any point within the detection area, possessing advantages of high resolution and signal-to-noise ratio ...
Yulong Pan, Weizhi Tao, Rui Yu, A. He
semanticscholar   +1 more source

Efficiency improvement of total focusing imaging based on sparse array method

2014 IEEE Far East Forum on Nondestructive Evaluation/Testing, 2014
In this paper, a design concept of sparse array is applied to total focusing imaging technique. During the process, the elements of a phased array are partially selected according to the theory of effective aperture, in order to reduce the amount of captured data and shorten the processing time of TFM imaging.
null Tao Peng, null Jian-ping Peng, null Hua Peng, null Li Wang, null Xiao-rong Gao, null Lin Luo, null Jin-long Li   +6 more
openaire   +1 more source