Modeling of ultrasonic fields and their interaction with defects

Calmon, Pierre; Paradis, L.

doi:10.1109/ultsym.1998.762263

Cited by 8 publications

(4 citation statements)

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“…The beam computation module computes the ultrasonic beam profile inside the material and the defect response module determines the interaction of this beam with the defects introduced into the virtual component. The results for defect response are given in the form of A, B and C-scans and echo-dynamic plots [18][19][20][21] . The present simulation study was carried out for a Zr-2.5% Nb pressure tube of 82 mm ID and 4 mm thickness.…”

Section: Ultrasonic Simulation Using Civa 10mentioning

confidence: 99%

Simulation studies for optimisation of phased array parameters for examination of roll-joints in pressurised heavy water reactor coolant channels

Nanekar¹,

Jothilakshmi²,

Jayakumar³

2013

insight

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The roll-joint area in the pressure tubes of pressurised heavy water reactors (PHWRs) is prone to delayed hydride cracking (DHC). This region is monitored during in-service inspection to avoid any catastrophic failure. The in-service inspection involves ultrasonic angle beam examination using a singlecrystal high-frequency immersion probe. The inspection is limited to a region of 30-40 mm just ahead of the roll-joint where DHC is expected to occur. An ultrasonic phased array technique has been developed to replace the conventional approach. Using phased array, it is possible to examine the roll-joint region for DHC in a single rotation of the inspection head without axial movement. As a result, there is a huge saving in the inspection time. Moreover, the focusing of the sound beam provided by the phased array helps to achieve enhanced sensitivity and resolution. This paper describes the simulation studies carried out for optimisation of the aperture size and focal laws for the phased array examination of the roll-joints of coolant channels of PHWRs. The results of the simulation are validated by carrying out experiments on a sample piece with reference EDM notches 6 mm long, 0.2 mm wide and 0.15 mm deep.

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Section: Ultrasonic Simulation Using Civa 10mentioning

confidence: 99%

Simulation studies for optimisation of phased array parameters for examination of roll-joints in pressurised heavy water reactor coolant channels

Nanekar¹,

Jothilakshmi²,

Jayakumar³

2013

insight

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“…They can be found with different approaches. The most rigorous approach is to simulate the ultrasonic field radiated by a point in direction of the probe elements [6]. This allows a very accurate measurement of the times of flight but can not be embedded in portable systems.…”

Section: Introductionmentioning

confidence: 99%

Adaptive ultrasonic imaging with the total focusing method for inspection of complex components immersed in water

Jeune¹,

Robert²,

Dumas³

et al. 2015

AIP Conference Proceedings

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In this paper, we propose an ultrasonic adaptive imaging method based on the phased-array technology and the synthetic focusing algorithm Total Focusing Method (TFM). The general principle is to image the surface by applying the TFM algorithm in a semi-infinite water medium. Then, the reconstructed surface is taken into account to make a second TFM image inside the component. In the surface reconstruction step, the TFM algorithm has been optimized to decrease computation time and to limit noise in water. In the second step, the ultrasonic paths through the reconstructed surface are calculated by the Fermat's principle and an iterative algorithm, and the classical TFM is applied to obtain an image inside the component. This paper presents several results of TFM imaging in components of different geometries, and a result obtained with a new technology of probes equipped with a flexible wedge filled with water (manufactured by Imasonic).

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“…These methods are based on the impulse response (IR) method [3][4][5][6][7][8][9][10], the angular spectrum technique [11][12][13], the finite element analysis [14,15], optical geometry studies [16,17], multi-Gaussian beam models [18] and so on. Using some of them, simulation tools have been developed for evaluation assessment in medical applications [19] or other sophisticated software packages, such as the CIVA program [20] for industrial NDE.…”

Section: Introductionmentioning

confidence: 99%