Topic
Time-of-flight diffraction ultrasonics
About: Time-of-flight diffraction ultrasonics is a research topic. Over the lifetime, 544 publications have been published within this topic receiving 3189 citations.
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Patent•
21 Dec 2017
TL;DR: In this article, a scanning carriage for simultaneous or concurrent subsea Time of Flight Diffraction (ToFD) and Phased Array Ultrasonic Testing (PAUT) of a subsea structure is presented.
Abstract: A scanning carriage, useful to perform simultaneous or concurrent subsea Time of Flight Diffraction (ToFD) and Phased Array Ultrasonic Testing (PAUT) of a subsea structure, comprises a housing machined to provide an incident angle for producing a predetermined set of desired refraction angles to help provide volumetric coverage of a weld in a one pass inspection; a Time of Flight Diffraction (ToFD) tool disposed proximate the housing and comprising a ToFD probe; a phased array tool, disposed proximate the ToFD tool, comprising a phased array ultrasonic probe and configured to produce multiple refracted angles with one probe placement; and a data communication link configured to interface with a data collection tool and operatively connected to the ToFD tool and the phased array tool.
Patent•
29 Aug 2019
TL;DR: In this article, a dual element time-of-flight diffraction (TOFD) transducer assembly is presented for use in detecting an anomaly (78) in a test piece (70).
Abstract: A dual element time-of-flight diffraction (TOFD) transducer assembly (10) for use in detecting an anomaly (78) in a test piece (70), the transducer assembly (10) comprising: a first transducer element (35) a configured to transmit ultrasonic signals (85a) to the test piece (70), and a second transducer element (35b) configured to receive diffracted ultrasonic signals (85b) from the test piece, wherein the first and second transducer elements (35a, 35b) are housed within a common housing (15), the housing (15) also forming part of the transducer assembly (10).
07 Sep 2020
TL;DR: In this article, a point source constrained partial differential equation (PSC-PDE) was proposed to reconstruct the silhouette of the subsurface defects in a plain woven CFRP plate.
Abstract: Elastodynamic response of orthotropic laminate composite structures subjected to an incident wave front is evaluated based on the integral representations in terms of the spatial impulse response. Being different from the conventional TOF or TOFD method, the spatial impulse response representation keeps information about the source and gives an opportunity for a quantitative near- and far-field analysis of the propagating wave field. This study, therefore, discusses a novel imaging method based on the point-source constrained partial differential equation (PSC-PDE) in order to reconstruct the silhouette of the subsurface defects. A point source response on the 2-dimensional space is analyzed mathematically and several acoustical experiments are performed to show accuracy and applicability of our proposed approach for imaging of defects in a plain woven CFRP plate.
TL;DR: In this article, a method using cross correlation and phase shift correction was proposed to improve the accuracy of crack sizing in the TOFD framework, where the resulting maximum peak of the cross correlation function between two signals combining with time delay introduced by phase shift determined the arrival time of diffracted signal.
Abstract: The ultrasonic time-of-flight-diffraction (TOFD) detection method has been widely used in crack size assessment. The key issue in TOFD is to determine the arrival time of crack tip diffracted signal. In the traditional cross correlation method, the resulting maximum peak of cross correlation function between two signals indicates the time of flight between them. In practical ultrasonic measurement, the transmission wave may be distorted and phase shift may be introduced. This paper presents a method using cross correlation and phase shift correction to improve the accuracy of crack sizing in the TOFD framework. The resulting maximum peak of the cross correlation function between two signals combining with time delay introduced by phase shift determine the arrival time of diffracted signal. Experimental results are used to demonstrate the advantage of the proposed method.