...Felix H Kim; Adam L Pintar; John Henry J. Scott; Edward J Garboczi A framework to generate simulated X-ray computed tomography (XCT) data of ground truth (denoted here as ‘GT’) flaws was developed for evaluation of flaw detection algorithms using image comparison metrics. The flaws are mimicking...

... Formulation for a Digital Image Correlation Method ,” Appl. Opt. , 44 ( 34 ), pp. 7357 – 7363 . 10.1364/AO.44.007357 [34] Besnard , G. , Hild , F. , and Roux , S. , 2006 , “ Finite-Element” Displacement Fields Analysis From Digital Images: Application to Portevin–le Chatelier Bands...

... Email: egon.merks@tno.nl Email: dennis.vanderburg@tno.nl Email: maurits.vanderheiden@tno.nl Email: quincy.martina@tno.nl 30 09 2022 27 12 2022 27 12 2022 02 03 2023 imaging materials testing product quality control sensors ultrasonics in-service inspection...

... the arrangement of knots in the resulting cut lumber. X-rays can image the interior of a log to detect the arrangement of the knots; however, traditional radiography measurements are two-dimensional in character and cannot provide the needed depth information. Conversely, computed tomography (CT) can provide...

... experimental setup using the following ingredients: A permanent magnet-based MFL probe. A scanning robot arm to move the probe along the sample. A direct current (DC) power supply. A data acquisition system (DAS). Other associated units. The image of the setup and its associated MFL probe...

... in transmission and the same aperture is used for the reception in plane wave imaging (PWI). A new methodology called angle beam virtual source FMC-TFM (ABVSFMC-TFM) is proposed to inspect thick attenuating materials such as nickel-base alloys. The ABVSFMC method leads to improved signal-to-noise ratio (SNR...

... on a sparse grid of piezoelectric transducers for exciting and sensing GWs that under certain conditions interact with damage while propagating. In recent years, various defect imaging algorithms have been proposed for processing GWs signals and, particularly, for computing an image representing the integrity...

...Collin J. C. Epstein; Ryan N. Goodner; R. Derek West; Kyle R. Thompson; Amber L. Dagel X-ray phase contrast imaging (XPCI) is a nondestructive evaluation technique that enables high-contrast detection of low-attenuation materials that are largely transparent in traditional radiography. Extending...

...Wenfeng Xiao; Lingyu Yu This paper presents a non-contact air-coupled Lamb wave imaging technique using a two-dimensional (2D) cross-correlation method that not only detects the damage but also precisely quantifies for orientations and sizes. The air-coupled transducers (ACT) is used together...

... microtomography system with a minimum image pixel size of 5 µ m. The microfocus X-ray source can operate with a maximum voltage of 130 kV and maximum power of 8 W. The samples were scanned with the following parameter: 100 kV, 80 µ A, rotation step of 0.50 deg with 360 deg rotation, 1.0 mm aluminum filter...

... are an excellent solution for field test measurement and imaging of material damage. This study explores the use of NLU metrics based on ratios of harmonic amplitudes and frequencies to map the buildup of damage precursors, such as crystal dislocations, under cyclic loading within the microstructure of fatigued...

... from interfaces are used as inputs for a newly developed imaging algorithm. The proposed method has the potential to be a reference-free and fully automated method. Standard methods to monitor bolt installations include bolt tension indicators [ 2 ] and bolt torque control [ 3 ]. An example...

... to mitigate the very low-intensity throughput and achieve acceptable scan image results will be discussed. Image processing (IP) methods used to segment porosity features in the FeMnAl blocks will also be discussed. References [1] American Society for Testing and Materials (ASTM) , 1995...

..., it is important to assess how well the required inspection and measurement tasks can be performed. Furthermore, it can be very informative to quantify image quality (IQ) metrics that can provide insight into the IQ characteristics that lead to the resulting inspection or measurement task performance. Inspection...

... and imaging. The defect echo and grain noise are distinguished through analyzing the spatial location where the echo is originating from. This is achieved by estimation of the angle of arrival (AOA) of the returned echo and evaluation of the likelihood that the echo is reflected from the point where the array...

... wrinkle 1 specimen and wrinkle 2 specimen were able to be detected at all frequencies using both the I-Flex probes. As observed in the previous ECA scanning results, increase in the frequency not only improves the detectability of the embedded wrinkle but also increases the noise in the images obtained...

... for the quantification of complex defect using topographic primal sketch (TPS) in magnetic flux leakage (MFL) testing. This method uses four excitation patterns so as to obtain MFL images from experiment; a mean image is then produced, assuming it has 80–90% the properties of all four images. A gradient manipulation...

... of the significant features to describe the deformation of the floating cover. The findings inform the selection of the unmanned aerial vehicle assisted photogrammetry parameters for optimal flight altitude, photogrammetry image overlap, and flight grid path for future integrity assessment of the floating covers...