Ultrasonic imaging of complex specimens by processing multiple incident angles in full-angle synthetic aperture focusing technique

Scharrer, Thomas; Schrapp, Michael; Rupitsch, Stefan J.; Sutor, Alexander; Lerch, Reinhard

doi:10.1109/tuffc.2014.2974

Cited by 12 publications

(5 citation statements)

References 22 publications

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“…When there is only the refracted shear wave, the incident angle is called the first critical angle α I . Moreover, the refracted shear wave will seriously affect the ultrasonic propagation in the specimen and lead to the ambiguity in testing image when the incident angle exceeds half of the first critical angle [17]. So, the range of the incident angle α i can be written as:…”

Section: Acquisition Of Multi-angle Echo Signalsmentioning

confidence: 99%

Multi-angle spatial compound imaging in ultrasonic immersion testing using a single transducer

Wang

et al. 2018

J. Inst.

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A multi-angle spatial compound imaging method was developed to suppress the speckles and artifacts in ultrasonic immersion testing using a single transducer. The multi-angle echo signals were acquired by an ultrasonic immersion testing system with different incident angles. With consideration of the acoustic difference between water and the specimen, the deviation of the time of flight (TOF) and refraction were corrected. Then the corrected signals were superimposed to reconstruct a multi-angle spatial compound image. The performance of the proposed method is assessed with quantitative accuracy, signal to noise ratio (SNR) and contrast to noise ratio (CNR). Compared with the conventional B-scan imaging, the quantitative accuracy of the longitudinal and lateral sizes of the defect holes in proposed method are respectively improved by an average of 12.3% and 15.8%, and the SNR and CNR are increased by an average of 6.13 dB and 2.65 dB, respectively. The results show the advantage of the proposed multi-angle spatial compound imaging for ultrasonic immersion testing in terms of the less quantitative error and artifacts.

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Section: Acquisition Of Multi-angle Echo Signalsmentioning

confidence: 99%

Multi-angle spatial compound imaging in ultrasonic immersion testing using a single transducer

Wang

et al. 2018

J. Inst.

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“…But this method was affected by its detection characteristics, the probe wasfocused at the interface of the media, and the resolution of traditional time-domain SAFT imaging could not be obtained [15].…”

Section: An Efficient Ultrasonic Saft Imaging For Pulse-echo Immersiomentioning

confidence: 99%

An Efficient Ultrasonic SAFT Imaging for Pulse-Echo Immersion Testing

Hu¹,

Jeong²

2017

Journal of the Korean Society for Nondestructive Testing

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An ultrasonic synthetic aperture focusing technique (SAFT) using a root mean square (RMS) velocity model is proposed for pulse-echo immersion testing to improve the computational efficiency. Considering the immersion ultrasonic testing of a steel block as an example, three kinds of imaging were studied (B-Scan, SAFT imaging based on ray tracing technology and RMS velocity). The experimental results show that two kinds of SAFT imaging have almost the same imaging performance, while the efficiency of RMS velocity SAFT imaging is almost 25 times greater than the SAFT based on Snell's law.

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“…1,2 Originally, neutron CT emerged from scientific research, with the technology having gained continuously more and more interest in industrial applications in the last few decades. 3 X-ray CT is commonly used since many years in NDT, mainly due to its high degree of availability and costefficiency.…”

Section: Introductionmentioning

confidence: 99%

Data fusion in neutron and X-ray computed tomography

Schrapp

Goldammer

Schulz

et al. 2014

Journal of Applied Physics

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We present a fusion methodology between neutron and X-ray computed tomography (CT). On the one hand, the inspection by X-ray CT of a wide class of multimaterials in non-destructive testing applications suffers from limited information of object features. On the other hand, neutron imaging can provide complementary data in such a way that the combination of both data sets fully characterizes the object. In this contribution, a novel data fusion procedure, called Fusion Regularized Simultaneous Algebraic Reconstruction Technique, is developed where the X-ray reconstruction is modified to fulfill the available data from the imaging with neutrons. The experiments, which were obtained from an aluminum profile containing a steel screw, and attached carbon fiber plates demonstrate that the image quality in CT can be significantly improved when the proposed fusion method is used. V C 2014 AIP Publishing LLC.

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Ultrasonic imaging of complex specimens by processing multiple incident angles in full-angle synthetic aperture focusing technique

Cited by 12 publications

References 22 publications

Multi-angle spatial compound imaging in ultrasonic immersion testing using a single transducer

Multi-angle spatial compound imaging in ultrasonic immersion testing using a single transducer

An Efficient Ultrasonic SAFT Imaging for Pulse-Echo Immersion Testing

Data fusion in neutron and X-ray computed tomography

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