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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TL;DR: Based on deep learning, a novel method termed Wave-Transform Network is proposed to tackle the issues of time-of-flight difference produced by the reflection of ultrasonic on the inner and outer surfaces of pipelines.
Abstract: An ultrasonic sensors system is commonly used to measure the wall thickness of buried pipelines in the transportation of oil and gas. The key of the system is to precisely measure time-of-flight difference (TOFD) produced by the reflection of ultrasonic on the inner and outer surfaces of the pipelines. In this paper, based on deep learning, a novel method termed Wave-Transform Network is proposed to tackle the issues. The network consists of two parts: part 1 is designed to separate the potential overlapping ultrasonic echo signals generated from two surfaces, and part 2 is utilized to divide the sample points of each signal into two types corresponding to before and after the arrival time of ultrasonic echo, which can determine the time-of-flight (TOF) of each signal and calculate the thickness of pipelines. Numerical simulation and actual experiments are carried out, and the results show satisfactory performances.
4 citations
Patent•
21 Sep 2018
TL;DR: In this article, an ultrasonic detection device and a method for PA-TOFD combined polyethylene pipeline hot-melt butt joint was proposed, which is based on a non-destructive testing technology of polyylene pipeline hotmelt Butt joint.
Abstract: The invention relates to a non-destructive testing technology of polyethylene pipeline hot-melt butt joint and aims to provide an ultrasonic detection device and method for PA-TOFD combined polyethylene pipeline hot-melt butt joint. The ultrasonic detection device comprises a circumferential scanning track which is arranged on a polyethylene pipeline; the circumferential scanning track is providedwith a circumferential scanning device; one end of the connecting rod is fixed on the top of the circumferential scanning device, and the other end of the connecting rod is respectively provided witha phased array probe and a single crystal straight probe through a probe holder; the two probes are positioned on two sides of the hot-melt butt joint of the polyethylene pipeline, and a gap is maintained between the end part of the probe and the polyethylene pipeline. The ultrasonic detector has two detection functions of ultrasonic phase control detection and TOFD detection, and the phased array probe is used as an acoustic wave transmitting probe for ultrasonic phased array detection and TOFD detection. And the two detection results are synchronously displayed in real time. The method overcomes the defects that the traditional pulse-type ultrasonic detection technology is not intuitive, the data cannot be recorded and stored, and the defects of precise positioning and quantification are difficult to be made.
4 citations
TL;DR: In this paper, the authors focused the applications of the ultrasound time of flight diffraction (TOFD) technique to thin and near surface inspections using shear wave diffracted echo (es) from the defect tips.
Abstract: Ultrasonic Time of Flight Diffraction (TOFD) for sizing defects is based on the time of flight of the longitudinal diffracted echo(es) that is (arc) generated when a longitudinal wave is incident on a crack tip TOFD technique so far has been commonly applied for the inspection of thick sections (>15 mm) and thickness below 5 mm from the scanning surface This paper focuses the applications of the TOFD technique to thin and near surface inspections using shear wave diffracted echo (es) from the defect tips Experimental result for simulated and realistic defects in thin samples will be presented
4 citations
01 Jan 1994
TL;DR: In this article, the authors describe the approach the French Atomic Energy Commission (C.E.A.) has adopted for modeling ultrasonic examinations, where one model was first developed to compute the ultrasonic field created by an immersed transducer in the piece being inspected.
Abstract: This paper describes the approach the French Atomic Energy Commission (C.E.A.) has adopted for modeling ultrasonic examinations. One model was first developed to compute the ultrasonic field created by an immersed transducer in the piece being inspected. This field is then entered as input to a second model in which the beam-defect interaction is processed and the result of the examination is predicted, in terms of the position, amplitude, and waveform of the various echoes generated due to the defect
4 citations
16 Dec 2002
TL;DR: In this paper, a brief description of the time-of-flight diffraction (TOFD) signals and the surface impulse ground penetrating radar (GPR) signals is provided, and it is shown how processing techniques developed for GPR data processing may be adapted for use with TOFD data.
Abstract: Surface impulse ground-penetrating radar (GPR) and ultrasonic time-of-flight diffraction (TOFD) are recent innovations in the respective geophysical remote sensing and non-destructive testing industries. Both techniques have proved highly versatile and valuable applications. This paper provides a brief description of the time-of-flight diffraction (TOFD) signals and the surface impulse ground penetrating radar (GPR) signals. The similarities between the two techniques are highlighted and it is shown how processing techniques developed for GPR data processing may be adapted for use with TOFD data.
4 citations