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Volker, A.W.F. (author), van Zon, A.T. (author)
Corrosion is one of the industries major issues regarding the integrity of assets. Currently, inspections are conducted at regular intervals to ensure a sufficient integrity level of these assets. Cost reduction while maintaining a high level of reliability and safety of installations is a major challenge. There are many situations where the...
conference paper 2014
document
van Zon, A.T. (author), Volker, A.W.F. (author)
The concept of predictive maintenance using permanent sensors that monitor the integrity of an installation is an interesting addition to the current method of periodic inspections. Guided wave tomography had been developed to create a map of the wall thickness using the travel times of guided waves. It can be used for both monitoring and for...
conference paper 2014
document
Volker, A.W.F. (author), van Zon, A.T. (author)
The inspection of wall loss corrosion is difficult at pipe supports due to limited accessibility. The recently developed ultrasonic Multi-Skip screening technique is suitable for this problem. The method employs ultrasonic transducers in a pitch-catch geometry positioned on opposite sides of the pipe support. Shear waves are transmitted in the...
conference paper 2014
document
Volker, A.W.F. (author)
Phased arrays are often used for rapid inspections. Phased arrays can be used to synthesize different wave fronts. For imaging, focused wave fronts are frequently used. In order to build an image, the phased array has to be fired multiple times at the same location. Alternatively, different data acquisition configurations can be designed in...
conference paper 2014
document
van Neer, P.L.M.J. (author), Volker, A.W.F. (author), Pierre, G. (author), Bouvet, F. (author), Crozat, S. (author)
Nanoparticles are increasingly used in a number of applications, e.g. coatings or paints. To optimize nanoparticle production in-line quantitative measurements of their size distribution and concentration are needed. Ultrasound-based methods are especially suited for in-line particle sizing. These methods can be used for opaque dispersions and...
conference paper 2014
document
van Neer, P.L.M.J. (author), Rasidovic, A. (author), Volker, A.W.F. (author)
There has been considerable interest in the noninvasive manipulation of particles in dispersions during the last 15 years. The manipulation techniques based on acoustic radiation forces are particularly interesting as they allow for the manipulation of particles based on their density, compressibility and/or size. The majority of the acoustic...
conference paper 2013
document
van Neer, P.L.M.J. (author), Robers, T. (author), Volker, A.W.F. (author)
pMUTs are efficient ultrasound sources and receivers in gasses, and are cheap to produce due to their lithographic production process. Making use of their 1st resonance frequency, a good signal to noise ratio (SNR) may be obtained using limited power. This is of interest for low cost-low power gas flow meters. However, using pMUTs in this...
conference paper 2013
document
De Soares Silva e Melo Mota, M. (author), van Neer, P.L.M.J. (author), van der Heiden, M.S. (author), Volker, A.W.F. (author)
Scanning using a strongly focused transducer gives a narrow focus depth and locally a high resolution. To obtain a high resolution at every point along the acoustic axis imaging is applied. Because the focal point can be considered as a second source, the wavefield can be split in its causal and anticausal parts. Imaging can be performed...
conference paper 2013
document
Volker, A.W.F. (author), Vos, H. (author)
Corrosion is one of the industries major issues regarding the integrity of assets. Currently inspections are conducted at regular intervals to ensure a sufficient integrity level of these assets. Cost reduction while maintaining a high level of reliability and safety of installations is a major challenge. The concept of predictive maintenance...
conference paper 2011
document
Volker, A.W.F. (author), Bloom, J.G.P. (author), Lorenz, M. (author), TNO Industrie en Techniek (author)
Inspection of corrosion at pipe support locations is difficult because of accessibility limitations. Recently a screening technique has been developed called Multi-Skip ultrasonics. The method utilizes a pitch-catch set-up. Shear waves are transmitted that reflect multiple times in the pipe wall, from which integral wall thickness information is...
conference paper 2010
document
Geers, L.F.G. (author), Volker, A.W.F. (author), Hunter, T.P.M. (author), TNO Industrie en Techniek (author)
A novel flow measurement principle is presented enabling non-intrusive volume flow measurements of liquids in the ml/min range. It is based on an opto-acoustical time-of-flight principle, where the time interval is recorded in which a thermal label travels a known distance through a flow channel. Big advantages are the insensitivity to...
article 2010
document
Volker, A.W.F. (author), Bloom, J.G.P. (author), TNO Industrie en Techniek (author)
The concept of predictive maintenance using permanent sensors that monitor the integrity of an installation is an interesting addition to the current method of periodic inspections. Guided wave tomography has been developed to map the wall thickness using the travel times of guided waves. The method has been demonstrated for straight pipes. The...
conference paper 2010
document
Volker, A.W.F. (author), Bloom, J.G.P. (author)
Corrosion is one of the industries major issues regarding the integrity of assets. Currently inspections are conducted at regular intervals to ensure a sufficient integrity level of these assets. Cost reduction while maintaining a high level of reliability and safety of installations is a major challenge. The concept of predictive maintenance...
conference paper 2010
document
Volker, A.W.F. (author)
public lecture 2010
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