Searched for: subject:"Ultrasonic"
(1 - 20 of 66)

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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), Sabbadini, A. (author), de Jong, N. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author)
Current ultrasonic clamp-on flow meters consist of a pair of single-element transducers which are carefully positioned before use. This positioning process consists of manually finding the distance between the transducer elements, along the pipe axis, for which maximum SNR is achieved. This distance depends on the sound speed, thickness and...
article 2021
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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), de Jong, N. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author)
Acoustic wave propagation in ultrasonic flow measurements is typically assumed to be linear and reciprocal.However, if the transmitting transducer generates a sufficiently high pressure, nonlinear wave propagation effects become significant. In flow measurements, this would translate into more information to estimate the flow and therefore a...
article 2021
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van Es, M.H. (author), Quesson, B.A.J. (author), Mohtashami, A. (author), Piras, D. (author), Hatakeyama, K. (author), Fillinger, L. (author), van Neer, P.L.M.J. (author)
In order to extract ever more performance from semiconductor devices on the same device area, the semiconductor industry is moving towards device structures with increasingly complex material combinations and 3D geometries. To ensure cost effective fabrication of next generation devices, metrology solutions are needed that tackle the specific...
conference paper 2020
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Ochoa, P.A. (author), Groves, R.M. (author), Bernedictus, R. (author)
A reliable damage diagnostic by ultrasonic guided wave (GW) based structural health monitoring (SHM) can only be achieved if the physical interactions between wave propagation, the SHM system and environmental factors are fully understood. The purpose of this research was to gain knowledge about the effects of high-amplitude low-frequency...
article 2020
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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), Pertijs, M.A.P. (author), de Jong, N. (author), Verweij, M.D. (author)
Current ultrasonic clamp-on flow meters are manually calibrated. This process is based on manual placement of two single-element transducers along a pipe wall. Due to the usually unknown pipe properties and inhomogeneities in the pipe geometry, the axial distance of the transducers needs to be manually calibrated to align the location of the...
conference paper 2019
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Saeed, A. (author), Volker, A.W.F. (author), Martina, Q. (author), Alalouni, A. (author)
Scale and corrosion affect the production certainty of oil and gas well. Scale build-up reduces flow and ultimately could shut down production when it block to tubing completely. Corrosion of the tubing wall occurs very often simultaneously with scale build-up and affects the integrity of the tubing wall. Vital information about the integrity is...
conference paper 2019
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Tamer, M.S. (author), van Es, M.H. (author), Sadeghian Marnani, H. (author), van der Lans, M.J. (author)
Scanning Probe Microscopy (SPM) has emerged as a metrology solution for the semiconductor industry enabling high throughput defect review and high resolution 3D metrology. TNO has developed a Subsurface Ultrasonic Resonant Force Microscopy (SSURFM) for non-destructive, high resolution imaging of features buried under one or more layers of...
other 2019
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van Es, M.H. (author), van Riel, M.C.J.M. (author), Duivenvoorde, T. (author), Sadeghian Marnani, H. (author)
Scanning Subsurface Ultrasonic Force Microscopy (SSURFM) relies on high frequency ultrasound in combination with Atomic Force Microscopy to detect viscoelastic properties of buried materials with high spatial resolution. The key ingredient is a very high frequency ultrasound wave which is amplitude modulated at the sensing cantilevers resonance...
other 2019
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Sprung, D. (author), Sucher, E. (author), Grossmann, P. (author), Kociok, T. (author), van Eijk, A.M.J. (author), Stein, K. (author)
conference paper 2019
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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D. (author), de Jong, N. (author), Pertijs, M. (author), Verweij, M. (author)
Typically, ultrasonic flow meters assume linear wave propagation. Nevertheless, if the transducers of an ultrasonic flow sensor excite a pressure wave with a high amplitude, nonlinear wave propagation effects become significant. The appearance of higher harmonics increases the bandwidth of the received signal, which may potentially lead to a...
conference paper 2018
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Sucher, E. (author), Sprung, D. (author), Kremer, M. (author), Kociok, T. (author), Van Eijk, A.M.J. (author), Stein, K. (author)
Wave propagation of electro-optical systems, lasers or imaging depends on the state of the atmosphere their beams are passing through. Fluctuations in the refractive index of air are responsible for signal attenuation and image degradation. This atmospheric effect is called optical turbulence and its strength is quantified by the structure...
conference paper 2018
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Sprung, D. (author), Sucher, E. (author), van Eijk, A.M.J. (author), Eisele, C. (author), Seiffer, D. (author), Stein, K. (author)
A field trial was performed in the arid scrub area of White Sands, NM /USA in October 2017 investigating the atmospheric influence on imaging and sensor performance. In this paper we focus on the strength of optical turbulence. Optical turbulence is described by the structure function parameter of the refractive index Cn 2. It is responsible for...
conference paper 2018
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van den Berg, F.D. (author), Kok, P.J.J. (author), Yang, H. (author), Aarnts, M.P. (author), Meilland, P. (author), Kebe, T. (author), Stolzenberg, M. (author), Krix, D. (author), Zhu, W. (author), Peyton, A.J. (author), Martinez-De-Guerenu, A. (author), Gutierrez, I. (author), Jorge-Badiola, D. (author), Malmström, M. (author), Volker, A.W.F. (author), Duijster, A.J. (author), Wirdelius, H. (author), Boström, A. (author), Mocci, C. (author), Vannucci, M. (author), Colla, V. (author), Davis, C. (author), Zhou, L. (author), Schmidt, R. (author), Labbé, S. (author), Reboud, C. (author), Skarlatos, A. (author), Leconte, V. (author), Lombard, P. (author)
In steel manufacturing, the conventional method to determine the mechanical properties and microstructure is by offline, destructive (lab-)characterisation of sample material that is typically taken from the head or the tail of the coil. Since coils can be up to 7 km long, the samples are not always representative for the main coil body. Also,...
conference paper 2018
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van Neer, P.L.M.J. (author), Stelwagen, U. (author), Geers, L.F.G. (author), Piras, D. (author), Corominas, F. (author), Grosso, M. (author), Giling, E.J.M. (author)
The number of chemical processes transferred from a batch-wise approach to continuous flow is increasing, due
conference paper 2018
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van Willigen, D. (author), van Neer, P.L.M.J. (author), Massaad, J. (author), Verweij, M. (author), de Jong, N. (author), Pertijs, M. (author)
Transit-time ultrasonic flow meters are based on the fundamental idea that the flow is the only non-reciprocal effect between an upstream and downstream measurement. Non-identical transducers can be used in a reciprocal manner if the circuit is made reciprocal. In this paper we analyze the effect of driver- and readout electronics on the zero...
conference paper 2018
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van Es, M.H. (author), Mohtashami, A. (author), van Neer, P.L.M.J. (author), Sadeghian Marnani, H. (author)
Imaging of nanoscale structures buried in a covering material is an extremely challenging task, but is also considered extremely important in a wide variety of fields. From fundamental research into the way living cells are built up to process control in semiconductor manufacturing would all benefit from the capability to image nanoscale...
article 2018
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Tamer, M.S. (author), van der Lans, M.J. (author), Sadeghian Marnani, H. (author)
Image Based Overlay (IBO) measurement is one of the most common techniques used in Integrated Circuit (IC) manufacturing to extract the overlay error values. The overlay error is measured using dedicated overlay targets which are optimized to increase the accuracy and the resolution, but these features are much larger than the IC feature size....
conference paper 2018
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Pahlavan, P.L. (author), Zhang, F. (author), Blacquière, G. (author), Yang, Y. (author), Hordijk, D. (author)
Interaction of ultrasonic waves with partially-closed surface-breaking cracks in concrete structures has been studied. Measurements have been conducted on a reinforced concrete beam containing various mechanical-load-induced cracks and compared with the baseline measurements at those locations. Influence of crack width, incident angle of waves...
article 2018
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van Groenestijn, G.J.A. (author), Meulendiiks, N.M.M. (author), Volker, A.W.F. (author), van Neer, P.L.M.J. (author), Buskens, P.J.P. (author)
Nanoparticles are applied in an increasing number of products (e.g. medicine, food and cosmetics). There is a need to real-time monitor the growth of nanoparticles during production inside the chemical reactor. However, standard particle sizing methods such as dynamic light scattering (DLS) and transmission electron microscopy (TEM) cannot do...
conference paper 2018
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van Binsbergen, S.A. (author), Grossmann, P. (author), Cohen, L.H. (author), van Eijk, A.M.J. (author), Stein, K.U. (author)
This paper compares in-situ and path-averaged measurements of the electro-optical transmission, with emphasis on aerosol effects. The in-situ sensors consisted of optical particle counters (OPC) and a visibility meter, the path-averaged data was provided by a 7-wavelength transmissometer (MSRT) and a scintillometer (BLS). Data was collected at a...
conference paper 2017
Searched for: subject:"Ultrasonic"
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