Searched for: +
(1 - 20 of 41)

Pages

List view
Grid view
document
Sakes, A. (author), Lageweg, M. (author), van Starkenburg, R.I.B. (author), Sontakke, S.S. (author), Spronck, J.W. (author)
With the ongoing miniaturization of surgical instruments, the ability to apply large forces on tissues for resection becomes challenging and the risk of buckling becomes more real. In an effort to allow for high force application in slender instruments, in this study, we have investigated using a hydraulic pressure wave (COMSOL model) and...
journal article 2022
document
Daem, Nathan (author), Mayer, Alexandre (author), Spronck, Gilles (author), Colson, Pierre (author), Loicq, J.J.D. (author), Henrist, Catherine (author), Cloots, Rudi (author), Maho, Anthony (author), Lobet, Michael (author)
Light management strategies using photonic crystals have been proven to efficiently improve light harvesting and subsequently conversion efficiency of various optoelectronic devices. This study focuses on 3D inverse opal CH3NH3PbI3 photoanodes in perovskite solar cells from a combined numerical and experimental approach. Varying the pore size...
journal article 2022
document
van den Toorn, S.W.M. (author), Spronck, J.W. (author), van Ostayen, R.A.J. (author), Lampaert, S.G.E. (author)
The objective of this research is to demonstrate the capability of a long stroke linear ferrofluid (FF) stage. This stage is a passive alternative to existing linear aerostatic stages and can be used in low loaded CNC devices, pick and place machines, microscopy or scanner applications. To compete with aerostatic stages the bearing must be...
journal article 2021
document
van den Toorn, S.W.M. (author), Spronck, J.W. (author), van Ostayen, R.A.J. (author), Lampaert, S.G.E. (author)
The novel contribution of this research is insight into the influence of different parameters in the magnet configurations on the load and stiffness of a ferrofluid pressure bearing. It is shown that magnets with a small cross-section magnetized alternatively up and downwards combine a high load capacity and moderate stiffness while being low...
journal article 2021
document
Boots, A. S.T. (author), Krijgsman, L. E. (author), de Ruiter, B. J.M. (author), Lampaert, S.G.E. (author), Spronck, J.W. (author)
Ferrofluid pocket bearings are a type of bearing that are able to carry a load using an air pocket encapsulated by a ferrofluid seal. Previously designed ferrofluid bearings show the great potential of the stick-slip-free and low viscous friction bearings, however until now the load capacity is limited. In this article a method is presented...
journal article 2019
document
Sakes, A. (author), Grandia, Leander (author), Lether, Remie (author), Steenstra, Lukas (author), Valentijn, Maurice C. (author), Breedveld, P. (author), Spronck, J.W. (author)
A major challenge during minimally invasive surgery is transfer of high forces through small, flexible instruments, such as needles and catheters, because of their low buckling resistance. In this study, we determined the feasibility of using a Newton's Cradle-inspired catheter (patented) to transfer high-force impulses. Exerting a high-force...
journal article 2019
document
Boots, Jelle (author), Spronck, J.W. (author), van Ostayen, R.A.J. (author), Lampaert, S.G.E. (author)
Ferrofluid pocket bearings are interesting for fast and precise positioning systems thank to the absence of stick-slip, the low viscous friction and their cost-effective nature. However, the characteristics of the bearing change due to over(de)compression since air escapes out of the enclosed pocket. This article presents an experimentally...
journal article 2019
document
Lampaert, S.G.E. (author), van Ostayen, R.A.J. (author), Spronck, J.W. (author)
Ferrofluid bearings have recently been successfully implemented in precise<br/>positioning systems. This article gives an overview of systems built in the<br/>Department of Precision and Microsystems Engineering at Delft University<br/>of Technology in the Netherlands. Most applications are in microscope stages,<br/>where high accuracy is...
journal article 2018
document
van de Ven, Oscar S. (author), Vogel, J.G. (author), Xia, Sha (author), Spronck, J.W. (author), Nihtianova, S. (author)
High-precision positioning often requires high speed and high resolution displacement measurements in order to compensate for the small vibrations of critical components. The displacement sensor must be precise and stable over a long period of time to avoid expensive recalibration. This requires tight mounting tolerances, which are especially...
journal article 2018
document
Lampaert, S.G.E. (author), Fellinger, B. J. (author), Spronck, J.W. (author), van Ostayen, R.A.J. (author)
Ferrofluid bearings have been demonstrated to be very interesting for precision positioning systems. The friction of these bearings is free of stick-slip which results in an increase of precision. More knowledge on the friction behaviour of these bearings is important for there application in precision positioning systems. This paper...
journal article 2018
document
Lampaert, S.G.E. (author), Spronck, J.W. (author), van Ostayen, R.A.J. (author)
A ferrofluid pocket bearings is a type of hydrostatic bearing that uses a ferrofluid seal to encapsulate a pocket of air to carry a load. Their properties, combining a high stiffness with low (viscous) friction and absence of stick-slip, make them interesting for applications that require fast and high precision positioning. Knowledge on the...
journal article 2018
document
Sakes, A. (author), Nicolaï, Tjibbe (author), Karapanagiotis, Jordan (author), Breedveld, P. (author), Spronck, J.W. (author)
Crossing highly calcified occlusions is technically challenging mainly due to guidewire buckling. In an effort to prevent buckling, a catheter that uses a dynamic impulse load is proposed. The proposed Wave catheter consists of an input plunger to generate an impulse at the handle, a hydraulic pressure wave confined within a ∅2 mm catheter to...
journal article 2018
document
Meskers, A.J.H. (author), Spronck, J.W. (author), Munnig Schmidt, R.H. (author)
The use of optical fibers presents several advantages with respect to free-space optical transport regarding sourcefrequency delivery to individual heterodyne interferometers. Unfortunately, fiber delivery to individual coaxial heterodyne interferometers leads to an increase of (periodic) nonlinearity in the measurement, because transporting...
journal article 2014
document
Meskers, A.J.H. (author), Spronck, J.W. (author), Munnig Schmidt, R.H. (author)
Periodic nonlinearity (PNL) in displacement interferometers is a systematic error source that limits measurement accuracy. The PNL of coaxial heterodyne interferometers is highly influenced by the polarization state and orientation of the source frequencies. In this Letter, we investigate this error source and discuss two interferometer designs,...
journal article 2014
document
Tekofsky, S. (author), Spronck, P. (author), Plaat, A. (author), Van den Herik, J. (author), Broersen, J. (author)
Traditional personality assessment methods fall into the categories of behavioral, observational, and self-report measures. In our research we explore the potential of adding another approach to this arsenal: personality assessment through video games. Video games combine the strengths of behavioral and observational measures, while side...
conference paper 2013
document
Meskers, A.J.H. (author), Voigt, D. (author), Spronck, J.W. (author)
Many error sources can affect the accuracy of displacement measuring interferometer systems. In heterodyne interferometry two laser source frequencies constitute the finally detected wavefront. When the wavefronts of these source frequencies are non-ideal and one of them walks off the detector, the shape of the detected wavefront will vary. This...
journal article 2013
document
Ellis, J.D. (author), Spronck, J.W. (author)
A compact, balanced, up to three degrees of freedom measuring interferometer which enables fiber delivery of an optical source without periodic nonlinearity, an interferometer system, and method for using an interferometer to measure up to three degrees of freedom is disclosed.
patent 2013
document
Ellis, J.D. (author), Meskers, A.J.H. (author), Spronck, J.W. (author), Munnig Schmidt, R.H. (author)
Displacement interferometry is widely used for accurately characterizing nanometer and subnanometer displacements in many applications. In many modern systems, fiber delivery is desired to limit optical alignment and remove heat sources from the system, but fiber delivery can exacerbate common interferometric measurement problems, such as...
journal article 2011
document
Pereira, S.F. (author), Spronck, J.F.P. (author), Kutchoukov, V.G. (author), Bachor, H.A. (author)
We present simulations and experimental results on encoding information both in the longitudinal and transverse directions of an optical beam reflected from an asymmetric pit. The method does not require interferometric detection but is based on intensity measurements using a simple quadrant detector. In addition, we also discuss the...
conference paper 2010
document
Pereira, S.F. (author), Spronck, J.F.P. (author), Kutchoukov, V.G. (author), Bachor, H.A. (author)
We present simulations and experimental results on encoding information both in the longitudinal and transverse directions of an optical beam reflected from an asymmetric pit. The method does not require interferometric detection but is based on intensity measurements using a simple quadrant detector. In addition, we also discuss the...
conference paper 2010
Searched for: +
(1 - 20 of 41)

Pages

List view
Grid view