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van der Meulen, P.Q. (author)Whereas aberrating layers are typically viewed as an impediment to medical ultrasound imaging, they can, surprisingly, also be used to our benefit. As long as we can model the effect of an aberrating layer, we can utilize ‘model-based imaging’, the imaging technique explored throughout this thesis, to reconstruct ultrasound images where...doctoral thesis 2023
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Ghahremani, A. (author), Lofi, C. (author)Reliable Cardiovascular Disease (CVD) classification performed by a smart system can assist medical doctors in recognizing heart illnesses in patients more efficiently and effectively. Electrocardiogram (ECG) signals are an important diagnostic tool as they are already available early in the patients’ health diagnosis process and contain...journal article 2023
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van der Graaf, H. (author), Bertolini, Alessandro (author), van Heijningen, Joris (author), Bouwens, Bram (author), de Gaay Fortman, Nelson (author), van der Reep, Tom (author), Otemann, Lennart (author)The Rasnik system is a 3-point optical displacement monitor with sub-nanometer precision. The CCD-Rasnik alignment system was developed in 1993 for monitoring the alignment of the muon chambers of the ATLAS Muon Spectrometer at CERN. Since then, the development has continued as new CMOS imaging pixel chips became available. In this work the...journal article 2023
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Saeedifar, M. (author), Saleh, M. (author), Krairi, Anouar (author), Teixeira De Freitas, S. (author), Zarouchas, D. (author)The present study proposes a comprehensive integrity assessment approach for a full-scale adhesively-bonded bi-material joint for maritime applications. The joint represents a cross-section of the bond-line connection of a ship with a steel hull and a sandwich composite superstructure. The full-scale joint consists of a sandwich composite...journal article 2023
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Tabatabaeian, A. (author), Jerkovic, Bruno (author), Harrison, Philip (author), Marchiori, Elena (author), Fotouhi, M. (author)Visual inspection is one of the most common non-destructive testing (NDT) methods that offers a fast evaluation of surface damage in aerospace composite structures. However, it is highly dependent on human-related factors and may not detect barely visible impact damage (BVID). In this research, low velocity impact tests with different energy...journal article 2023
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van der Meulen, P.Q. (author), Coutino, Mario (author), Bosch, Johannes G. (author), Kruizinga, P. (author), Leus, G.J.T. (author)We consider the scenario of finding the transfer function of an aberrating layer in front of a receiving ultrasound (US) array, assuming a separate non-aberrated transmit source. We propose a method for blindly estimating this transfer function without exact knowledge of the ultrasound sources or acoustic contrast image, and without directly...journal article 2023
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Bruschini, Claudio (author), Burri, Samuel (author), Bernasconi, Ermanno (author), Milanese, Tommaso (author), Ulku, Arin C. (author), Homulle, Harald (author), Charbon-Iwasaki-Charbon, E. (author)The LinoSPAD2 camera combines a 512×1 linear single-photon avalanche diode (SPAD) array with an FPGA-based photon-counting and time-stamping platform, to create a reconfigurable sensing system capable of detecting single photons. The read-out is fully parallel, where each SPAD is connected to a different FPGA input. The hardware can be...conference paper 2023
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Stuber, V.L. (author), Kotsonis, M. (author), van der Zwaag, S. (author)Two piezoelectric series bimorph sensors were embedded below the skin of a NACA 0012 symmetrical airfoil to detect the local state of the boundary layer during wind tunnel testing. Small vanes piercing the airfoil skin were glued onto the bimorphs providing a mechanical coupling to the local mechanical force fluctuations imparted by the local...journal article 2022
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González, Elena (author), Balado Frías, J. (author), Arias, Pedro (author), Lorenzo, Henrique (author)The enrichment of the point clouds with colour images improves the visualisation of the data as well as the segmentation and recognition processes. Coloured point clouds are becoming increasingly common, however, the colour they display is not always as expected. Errors in the colouring of point clouds acquired with Mobile Laser Scanning are...journal article 2022
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Hafner, Frank M. (author), Bhuyian, Amran (author), Kooij, J.F.P. (author), Granger, Eric (author)Person re-identification is a key challenge for surveillance across multiple sensors. Prompted by the advent of powerful deep learning models for visual recognition, and inexpensive RGB-D cameras and sensor-rich mobile robotic platforms, e.g. self-driving vehicles, we investigate the relatively unexplored problem of cross-modal re...journal article 2022
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Benmahdjoub, Mohamed (author), Niessen, W.J. (author), Wolvius, Eppo B. (author), van Walsum, T. (author)Augmented reality (AR) permits the visualization of pre-operative data in the surgical field of view of the surgeon. This requires the alignment of the AR device’s coordinate system with the used navigation/tracking system. We propose a multimodal marker approach to align an AR device with a tracking system: in our implementation, an...journal article 2022
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Theuwissen, A.J.P.A.M. (author)This article focuses on the angular dependency of the light sensitivity of a commercially available CMOS camera with a global shutter (storage node (SG) in the charge domain) and shared pixel architecture. The angular dependency is characterized as a function of both the wavelength and the angle of incidence of the incoming light. The...journal article 2022
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Romijn, J. (author), Vollebregt, S. (author), Middelburg, L.M. (author), el Mansouri, B. (author), van Zeijl, H.W. (author), May, Alexander (author), Erlbacher, Tobias (author), Leijtens, Johan (author), Zhang, Kouchi (author), Sarro, Pasqualina M (author)This work demonstrates the first on-chip UV optoelectronic integration in 4H-SiC CMOS, which includes an image sensor with 64 active pixels and a total of 1263 transistors on a 100 mm2 chip. The reported image sensor offers serial digital, analog, and 2-bit ADC outputs and operates at 0.39 Hz with a maximum power consumption of 60 μW, which are...journal article 2022
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Christensen, Christian Overgaard (author), Zhang, F. (author), Zarate Garnica, G.I. (author), Lantsoght, E.O.L. (author), Goltermann, Per (author), Schmidt, Jacob Wittrup (author)Advanced monitoring methods are required to identify stop criteria in proof-load tests. In this study, the combined methodology of two-dimensional digital image correlation and acoustic emission is investigated for its applicability for future implementation in field tests. The two monitoring systems are deemed to provide valuable insight...journal article 2022
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Lee, J. (author), Theuwissen, A.J.P.A.M. (author)A column-parallel 10-bit SAR ADC for high-speed image sensors has been implemented. A fast offset calibration technique using memory is proposed to compensate for the offset mismatch, accompanied by an ADC designed for a narrow space the size of a single column pitch. The memory accumulates the variation of the offset to track the offset...journal article 2022
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Theuwissen, A.J.P.A.M. (author)This article focuses on the parasitic light sensitivity (PLS) of a commercially available CMOS camera with a global shutter (with a storage node in the charge domain) and shared pixel architecture. The PLS is characterized as a function of both the wavelength and the incident angle of the incoming light. The measurement results are linked to...journal article 2022
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de Bruijne, Bas (author), Vdovin, Gleb (author), Soloviev, O.A. (author)We have applied a combination of blind deconvolution and deep learning to the processing of Shack-Hartmann images.By using the intensity information contained in spot positions, and the fine structure of the separate images created by the lenslets,we have increased the sensitivity and resolution of the sensor over the limit defined by...journal article 2022
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van Diepen, C.J. (author)More is more applies in particular to systems with interacting parts. These interactions enable the emergence of collective behaviour. Examples can be found among the behaviour of animals, such as the V-shaped formation of migrating geese and the flight of a flock of starlings. More examples are found among the electromagnetic properties of...doctoral thesis 2021
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Ge, X. (author)In pursuit of achieving the noise condition of single-photon imaging, system-level and circuit-level innovations and optimizations for CMOS image sensor (CIS) noise reduction are called for. Stimulated by this motivation, this thesis focuses on reducing the temporal noise generated in the pixels and the readout electronics.doctoral thesis 2021
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Abarca Prouza, A.N. (author)This thesis describes the integration of temperature sensors into a CMOS image sensor (CIS). The temperature sensors provide the in-situ temperature of the pixels as well as the thermal distribution of the pixel array. The temperature and the thermal distribution are intended to be used to compensate for dark current affecting the CIS. Two...doctoral thesis 2021