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Use of the Total Focusing Method with the Envelope Feature
Materials Evaluation, 2020This paper presents how to compute the envelope of a total focusing method (TFM) image and the benefits of using this TFM envelope as part of a code-compliant solution. The TFM envelope is obtained by computing the norm of two different TFM images; namely, a first TFM image computed using the standard acquired full matrix capture (FMC), and a second ...
Nicholas Badeau +2 more
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A Study of Total Focusing Method for Ultrasonic Nondestructive Testing
Journal of Testing and Evaluation, 2013Abstract Commercial ultrasonic phased array (PA) systems can perform multiple inspections in real-time using array transducers. This approach involves firing array elements in a particular sequence to produce high-resolution images at a high frame rate with excellent signal-to-noise ratio (SNR).
Po-Yen Tseng +5 more
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Effects of directivity function on total focusing method imaging performance
2014 IEEE Far East Forum on Nondestructive Evaluation/Testing, 2014The 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 +4 more
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Improvement of the total focusing method using an inverse problem approach
2017 IEEE International Ultrasonics Symposium (IUS), 2017Imaging 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 +3 more
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Efficiency improvement of total focusing imaging based on sparse array method
2014 IEEE Far East Forum on Nondestructive Evaluation/Testing, 2014In 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 +6 more
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Ultrasonic imaging in coarse-grained stainless steels by total focusing method
AIP Conference Proceedings, 2016In 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.
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Defect detection using ultrasonic arrays: The multi-mode total focusing method
NDT & E International, 2010Ultrasonic 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 +3 more
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Multiwave Total Focusing Method for Full-Matrix Imaging Using Ultrasonic Phased Array
Materials Evaluation, 2021The imaging range of the traditional total focusing method (TFM) is usually limited by the directivity of excitation of a single wave pattern. In this paper, a multiwave TFM technique is proposed, which uses both compression and shear vertical (SV) waves for detection and imaging simultaneously.
Ping Zhang +6 more
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Ultrasonic Nondestructive Evaluation of Composite Components Using Advanced Total Focusing Method
Advanced Materials Research, 2013The 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
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Effects of array transducer inconsistencies on total focusing method imaging performance
NDT & E International, 2011The 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
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