Results 261 to 270 of about 5,447,906 (320)

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, Na Xu   +5 more
semanticscholar   +1 more source

Improvement of the total focusing method using an inverse problem approach

2017 IEEE International Ultrasonics Symposium (IUS), 2017
Imaging using the total focusing method (TFM) is a popular tool, which is becoming a standard, for nondestructive testing and evaluation. From full matrix capture data, it consists in focusing at each point of a defined reconstruction zone. It is generally more efficient than conventional phased array focusing, which only focuses at a few points ...
Ewen Carcreff, Nans Laroche, Sebastien Bourguignon, Dominique Braconnier   +3 more
openaire   +2 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

Defect detection using ultrasonic arrays: The multi-mode total focusing method

NDT & E International, 2010
Ultrasonic arrays allow a given scatterer to be illuminated from a wide range of angles and hence are capable of extracting significant information about the scatterer. In this paper a general imaging methodology, termed multi-mode total focusing method, is proposed in which any combination of modes and reflections can be used to produce an image of ...
Zhang, J, Drinkwater, BW, Wilcox, PD, Hunter, AJ   +3 more
openaire   +2 more sources

Ultrasonic Nondestructive Evaluation of Composite Components Using Advanced Total Focusing Method

Advanced Materials Research, 2013
The application of ultrasonic phased array has been increasingly common in nondestructive testing and evaluation of composite components. An advanced post-processing imaging algorithm of ultrasonic array, termed total focusing method, is introduced to improve imaging quality and detection ability. Then, the experiment system is developed to capture and
Na Xu, Yang Li, Zheng Gan Zhou
openaire   +1 more source

Simulation of the Application of Compressive Sensing to Ultrasound Total Focusing Method Imaging

Symposium on Piezoelectricity, Acoustic Waves and Device Applications, 2021
In order to lower the sampling rate and to reduce the huge amount of data in imaging of phased array total focus method, an ultrasound detection imaging method is proposed which is based on compressive sensing. The “analog-information converter” (AIC) is
Zhi-ying Liu, Shouguo Yan, Juan Huang, Bi-xing Zhang   +3 more
semanticscholar   +1 more source

Effects of array transducer inconsistencies on total focusing method imaging performance

NDT & 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.
Zhang, J, Drinkwater, BW, Wilcox, PD
openaire   +2 more sources

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

Phased-Array Laser Ultrasonic Testing with Sparse Total Focusing Imaging Method

2019 Far East NDT New Technology & Application Forum (FENDT), 2019
In order to further improve the detectability of laser ultrasonic testing method for internal defects of materials, this paper studies a new phased array laser ultrasonic detection and imaging method based on the full matrix capture technology and total focusing method.
Xing Kou, Cuixiang Pei, Shangzi Wu, Zhenmao Chen   +3 more
openaire   +1 more source