Testing large aerospace CFRP components by ultrasonic multichannel conventional and phased array pulse-echo techniques

Engl, G.; Meier, Roland; Brandt, Christopher

doi:10.1784/insi.45.3.202.53160

Cited by 6 publications

(4 citation statements)

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“…PAUT can obtain the images of the inside of a specimen in real time through linear/electronic scan, enabling high-speed electronic scanning within the length range of the PA probe, as well as sectorial scan (S-scan), which can create the required sectorial beam using a PA probe [ 3 , 4 , 5 ]. Consequently, this technique has been applied in various areas, such as power plants [ 6 , 7 , 8 , 9 ], railways [ 10 , 11 , 12 ], aerospace [ 13 , 14 , 15 ], and construction [ 16 , 17 ]. In particular, power plants constitute a significant application field of PAUT, which is applied in ISI for the welded joints of power plant containers or other facilities.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flaw Detection Sensitivity of Phased Array Ultrasonics in Austenitic Steel Welds According to Inspection Conditions

Kim

Cho

Park

2021

Sensors

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The anisotropy and inhomogeneity exhibited by austenitic steel in welds poses a challenge to nondestructive testing employing ultrasonic waves, which is predominantly utilized for the inspection of welds in power plants. In this study, we assess the reliability of phased array ultrasonic testing (PAUT) by analyzing the flaw detection sensitivity of ultrasonic beams in anisotropic welds, based on the inspection conditions. First, we simulated the sectorial scan technique, frequently employed for the inspection of actual welds, while taking into account the ultrasonic wave mode, frequency, and shape and position of a flaw. Subsequently, we analyzed the flaw sensitivity by comparing A-scan signals and S-scan results. The sensitivity analysis results confirmed the detection of all flaws by considering at least two inspection methods based on the shape and position of the flaw. Furthermore, we verified our model by performing an experiment under the same conditions as the simulation and found that the results were in agreement. Hence, we find that the simulation modeling technique proposed in this study can be utilized to develop suitable inspection conditions, according to the flaw characteristics or inspection environment.

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Section: Introductionmentioning

confidence: 99%

Analysis of Flaw Detection Sensitivity of Phased Array Ultrasonics in Austenitic Steel Welds According to Inspection Conditions

Kim

Cho

Park

2021

Sensors

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“…There are applications where improvements in two-dimension flaw-location are achievable using several ultrasonic transducers. In fact, it is well-known that the use of more than one detection transducer provides complementary information about some types of reflector (Reguieg et al 2006, Engl and Meier 2002, Roy et al 1999, Chang and Hsieh 2002, Rodríguez et al 2004. These transducers can be located on the same plane (the so-called traditional linear or matrix phase-array cases) or on different planes, depending on the sample shape and the detection requirements.…”

Section: Introduction Background and Objectivesmentioning

confidence: 99%

“…Efficient solutions to these types of problems remain to be solved, but there are several works oriented in this direction. Some attempts employ two transducers and additional digital processing of the echoes (Chang and Hsieh 2002), while others (with a bigger cost) are based on several arrays mounted over the piece under inspection (Engl and Meier 2002).…”

Section: Introduction Background and Objectivesmentioning

confidence: 99%

Wavelet-based 2D fusing of ultrasonic pulse-echo traces measured from two arrays radiating orthogonal beams

Rodríguez-Hernández

Ramos²,

Emeterio³

2011

Meas. Sci. Technol.

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Ultrasonic measurements using orthogonal collimated beams provide both complementary and redundant information about internal parts of pieces or structures being tested, which must be fused. In this paper, a new wavelet-based digital processing technique which fuses ultrasonic pulse-echo traces obtained from several transducers located in two perpendicularly-coupled arrays is proposed. This is applied to accurately visualize the location of a small internal reflector by means of two dimensional (2D) displays. A-scans are processed in wavelet domain and fused in a common 2D pattern. A mathematical expression of the resulting 2D signal-to-noise ratio (SNR) is derived, and its accuracy is confirmed using benchmark tests performed with simulated registers and real measurements acquired using a multi-channel laboratory prototype. The measurement system consists of two properly-coupled perpendicular arrays comprising 4 square pulsed transducers and electronic driving circuitry. This technique improves 2D-SNR by a factor of twice the number of bands. In addition, good reflector location is obtained, since sub-millimeter 2D resolutions are achieved, despite only requiring eight ultrasonic channels. This good performance is confirmed by comparing the new wavelet fusing method with the two previously described techniques.

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“…In addition, it should be noted that the detection capability also depends on other important factors, because, from a more general point of view, still some physical limitations of the ultrasonic beams remain for a) certain angles of the scanning (Chang and Hsieh 2002), b) for certain complex geometries of the industrial components to be tested (Roy et al 1999) or c) for biological elements in medical diagnosis (Defontaine et al 2004, Reguieg et al 2006. Schemes have been preliminarily proposed in order to improve flaw detection in difficult conditions, trying to resolve these type of aspects well with two transducers and additional digital signal processing of echoes (Chang and Hsieh 2002), or well with several arrays of few elements (Engl and Meier 2002). Other posterior alternative proposals, based on perpendicular scanning from two planes with a reduced transducers number and ultrasonic beams overlapping, were reported (Meyer andCandy 2002, Rodríguez et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Applications of Digital Signal Processing

Cuadrado-Laborde¹

2011

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Dr. Christian Cuadrado-Laborde received his Ph.D. degree in physics from La Plata University (UNLP, Argentina, 2005), and his Electric and Electronic Engineer degree from the San Luis University (UNSL, Argentina, 1998). Then, he joined to the most important federal research agency in Argentina (CONICET, 2005); where he is actually an Associate Researcher. He is currently also an Associate Professor of the La Plata Catholic University (Argentina). He has served also as an Assistant Professor of the Faculty of Engineering of the UNLP. He was awarded by the Spanish Ministry of Science with a research fellow position to join to the Optical Fiber Laboratory group headed by M. V. Andrés of the Valencia University (Spain) during 2008-2009. Since then, he has a fluid collaboration with this research group. He serves also as a reviewer for several well-known journals of the Optical Society of America, the IEEE, Elsevier, SPIE, and the Electromagnetic Academy. He has published several papers in top-tier scientific journals such as Optics Letters, Laser & Photonics Reviews, Optics & Photonics News, etc. His current research interest includes fiber optics applications, photonic processing, and all-fiber lasers.

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Testing large aerospace CFRP components by ultrasonic multichannel conventional and phased array pulse-echo techniques

Cited by 6 publications

References 0 publications

Analysis of Flaw Detection Sensitivity of Phased Array Ultrasonics in Austenitic Steel Welds According to Inspection Conditions

Analysis of Flaw Detection Sensitivity of Phased Array Ultrasonics in Austenitic Steel Welds According to Inspection Conditions

Wavelet-based 2D fusing of ultrasonic pulse-echo traces measured from two arrays radiating orthogonal beams

Applications of Digital Signal Processing

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