Results 201 to 210 of about 1,733,086 (239)

Ultrasonic Inspection of Weld Defects Using Total Focusing Method

2021
Ultrasonic arrays have been widely employed in industrial applications because of their ability to perform quick inspections for detection and characterization of flaws. The total focusing method (TFM) is an advanced ultrasonic imaging technique that utilizes the full matrix capture (FMC) data of the phased array elements to generate a high-resolution ...
Lalith Sai Srinivas Pillarisetti, Subramanian Anandamurugan   +1 more
openaire   +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

Effects of array transducer inconsistencies on total focusing method imaging performance

NDT and E International, 2011
The total focusing method (TFM) is a post-processing imaging algorithm for ultrasonic array data in which the array is synthetically focused at every image pixel. In this paper, the performance of the TFM imaging algorithm is examined in the presence of inter-element variability in the array, coupling and instrumentation.
Jie Zhang, Bruce W Drinkwater
exaly   +3 more sources

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

Ultrasonic imaging in coarse-grained stainless steels by total focusing method

AIP Conference Proceedings, 2016
In the present work, the Total Focusing Method (TFM) is used to image flaws in coarse-grained steels with a contact phased-array probe. In order to reduce the noise introduced by the heterogeneous structure, as well as artifacts due to surface guided waves, the Decomposition of the Time Reversal Operator method is performed before calculating TFM ...
Villaverde, E.L., Robert, S., Prada, C.
openaire   +2 more sources

The post-processing of ultrasonic array data using the total focusing method

Insight - Non-Destructive Testing and Condition Monitoring, 2004
The use of ultrasonic arrays for NDT has increased significantly in recent years. This is due to the flexibility of array systems which can be electronically configured to produce plane, focused, steered and steer-focusedbeams. In this way, one array transducer can do the job of many standard single-element transducers.
Holmes, C, Drinkwater, BW, Wilcox, PD
openaire   +1 more source

Total Focusing Method with Subsampling in Space and Frequency Domain for Ultrasound NDT

2019 IEEE International Ultrasonics Symposium (IUS), 2019
In this paper, we present a compressed sensing model for 2D Full Matrix Capture data from a uniform linear array. Data is reconstructed via a matrix-free implementation of the Total Focusing Method (TFM) combined with the Fast Iterative Shrinkage/ Thresholding Algorithm.
Eduardo Perez, Jan Kirchhof, Sebastian Semper, Fabian Krieg, Florian Romer   +4 more
openaire   +1 more source

Ultrasonic total focusing method for internal defects in composite insulators

Insight - Non-Destructive Testing and Condition Monitoring
In order to address the problem of poor imaging detection of internal defects caused by the multi-layer curved surface structure and strongly attenuating material of composite insulators, the total focusing method (TFM) with two-layer curved surface correction was investigated.
Hongwei Hu, Jinhan Huang, Duo Lyu, Wenzheng Liu, Xiaoqiang Xu   +4 more
openaire   +1 more source

Research on Detection of Weld Defects with Multi-Wave Total Focusing Method

2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA), 2019
In the modern industry, welded structures are widely used, especially in the aerospace and nuclear industries. In order to prevent accidents, defect detection must be performed. Due to the high anisotropy and non-uniformity in the soldered area, the signal-to-noise ratio(SNR) of the imaging defect is low and the image quality is poor.
Ping ZHANG, Shou-guo YAN, Juan HUANG, Bi-xing ZHANG   +3 more
openaire   +1 more source

Implementation of total focusing method for phased array ultrasonic imaging on FPGA

SPIE Proceedings, 2015
This paper describes a multi-FPGA imaging system dedicated for the real-time imaging using the Total Focusing Method (TFM) and Full Matrix Capture (FMC). The system was entirely described using Verilog HDL language and implemented on Altera Stratix IV GX FPGA development board.
JianQiang Guo, Xi Li, Xiaorong Gao, Zeyong Wang, Quanke Zhao   +4 more
openaire   +1 more source