A5063542355- Sensor Technology and Measurement Systems
- Magnetic Field Sensors Techniques
- Metamaterials and Metasurfaces Applications
- Inertial Sensor and Navigation
- Superconducting Materials and Applications
- Antenna Design and Analysis
- Advanced Electrical Measurement Techniques
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Magneto-Optical Properties and Applications
- Advanced MEMS and NEMS Technologies
- Astronomical Observations and Instrumentation
- Energy Harvesting in Wireless Networks
- Oil Spill Detection and Mitigation
- Advanced Antenna and Metasurface Technologies
- Advanced Fiber Optic Sensors
- Particle accelerators and beam dynamics
- Ionosphere and magnetosphere dynamics
- Marine and coastal ecosystems
- Geophysics and Sensor Technology
- Microwave Engineering and Waveguides
- Historical Astronomy and Related Studies
- Coastal and Marine Dynamics
- Crystallography and Radiation Phenomena
- Fire Detection and Safety Systems
ITER
2020-2024
European Organization for Nuclear Research
2010-2023
Polytechnic University of Bari
2019
University of Naples Federico II
2007-2014
Institute of Electrical and Electronics Engineers
2014
École Polytechnique Fédérale de Lausanne
2011-2013
University of Sheffield
2013
The sensitivity of linear variable differential transformer (LVDT) position sensors to external slowly varying magnetic fields represents a critical issue when these are installed close high-current cables or electrical motors with significant fringe fields. resulting error can reach several hundreds micrometers against specified uncertainty normally below few micrometers. In this paper, the design LVDT sensor high rejection constant is addressed by exploiting finite element method (FEM)...
Static or slowly varying magnetic fields can affect the performances of linear variable differential transformer by inducing a position reading drift. The problem is barely addressed in LVDTs' datasheets, and no quantitative information on induced error given. An LVDT finite element model here presented together with its experimental validation order to propose tool for study effects external LVDTs design less sensitive devices. has been validated standard working conditions presence an...
The ironless inductive position sensor is a linear sensing structure, which exhibits intrinsic immunity to external magnetic fields since it characterized by air-cored windings. This new solution may be of major interest for applications where can source interference. In this paper, an analytical model the working principle proposed. effect moving coil flux on overall sensed described. preliminarily verified simulations finite-element structure sensor, in order assess its soundness. Finally,...
The ironless inductive position sensor is a novel linear position-sensing device that should exhibit immunity to external magnetic fields while simultaneously guaranteeing high-precision measurements in harsh environments. This paper focuses on the characterization of sensor's working principle and field immunity. tested, with both voltage current supply, different dc slowly varying patterns order prove its analyze differences similarities between two supply cases. are performed test bench...
The ironless inductive position sensor (I2PS) is a five-coil air-cored structure that senses the variation of flux linkage between supply and sense coils relates it to linear moving coil. In structures, skin proximity effect can bring substantial variations electrical resistance, leading important deviations from low-frequency functioning. this paper, an analysis high-frequency phenomena on I2PS functioning described. key-element modeling resistance as function frequency, which starts...
In this paper, we assess the effect of cryostat bridge vibrations on plasma current measurement accuracy when using a fiber optic sensor (FOCS) in ITER. The impact light polarization state was first experimentally investigated miniaturized mock-up which represented relevant part ITER FOCS structure. set-up then numerically simulated Jones matrix approach. Equivalent vibration matrices obtained from experiment were used simulations to determine accuracy. It is demonstrated that although imply...
This paper presents a prototype of Linear Variable Differential Transformer, which has been designed, simulated and produced in order to observe, study characterize the effects on its working an external interfering magnetic field. The LVDT first simulated, both standard conditions case interference, by using FEM software FLUX. design guidelines coming from simulations have used develop complete set measurements performed it. A comparison between is then proposed.
A novel sensing structure for linear position measurement is presented. It based on variable inductive coupling between different coils, as in Linear Variable Differential Transformers. Nevertheless, the novelty of concept stays intrinsic immunity proposed sensor to external DC/slowly varying magnetic fields, achieved by avoiding use materials (i.e. cores). Features like absence sliding contacts, infinite resolution and field make this solution very attractive harsh environment applications....
Keywords: electromagnetic modelling ; finite element method linear variable differential transformer skin effect proximity Maxwell’s equations digital signal processing thermal effects optimization procedure These Ecole polytechnique federale de Lausanne EPFL, n° 5596 (2013)Programme doctoral Systemes production et RobotiqueFaculte des sciences techniques l'ingenieurInstitut microtechniqueLaboratoire d'actionneurs integresJury: R. Clavel (president), H. Bleuler, M. Buzio, C. Espanet Public...
This paper presents a novel reading algorithm for an ironless inductive position sensor which exhibits immunity to single-frequency interference (both high and low frequency signals). is based on the three-parameter sine fitting, whose performances have been enhanced with proper windowing function design. The proposed precision suitability real-time implementation. of new are tested simulated measured signals results discussed in detail. has finally validated target.
The identification of oil slicks on the ocean surface from SAR data requires quantitative sound models accounting for most important characteristics (ocean spectrum, slick viscosity, shape, and so on). In this paper we present implementation an innovative raw signal image simulator, which is able to reproduce images relative surfaces covered by with arbitrary shapes. attention mainly focused fractal contours. Weierstrass-Mandelbrot function used generate fixed dimension. A box counting...
The ironless inductive position sensor can be the ideal candidate for linear sensing in harsh environment and presence of external magnetic fields. Starting from validated electromagnetic characteristics, this paper presents a model thermal effects influencing sensor's reading an effective algorithm to compensate them. compensation is performed without affecting nominal functioning using additional temperature probes, which would complicate assembly. constitutes basis algorithm, then through...
An ironless position sensor is a novel sensing structure which exhibits intrinsic immunity to external magnetic fields, since it characterized by air-cored supply and windings. This new solution may be of significant interest for applications where fields are present. In this paper, an analytical model the working principle proposed. The effect moving coil flux on overall sensed described. modeling such acts as design tool primary importance in framework synthesis device. verified...
Thanks to their capability cover large areas, in all weather conditions, during the day as well night, spaceborne Synthetic Aperture Radar (SAR) techniques constitute an extremely promising alternative traditional surveillance methods. Nevertheless, order assure further usability of SAR images, specific data mining tools are still be developed provide efficient automatic interpretation data. The aim this paper is introduce texture analysis performed framework time - frequency theory, a means...
The Ironless Inductive Position Sensor (I2PS) is an air-cored displacement sensor which has been conceived to be totally immune external DC/slowly-varying magnetic fields. It can thus used as a valid alternative Linear Variable Differential Transformers (LVDTs), show position error in environments. In addition, since it retains the excellent properties of LVDTs, I2PS harsh environments, such nuclear plants, plasma control and particle accelerators. This paper focuses on design optimization...
This paper explores the possibility of using electromagnetic metamaterials to synthesize an equivalent structure that approaches superconductive-like properties, i.e. extremely high electrical conductivity. The underlying model is formalized analytically transmission line theory and supported by experimental measurements. particular use could bring ground-breaking scenario developing cavities lossless guiding structures at ambient temperature.
The ironless inductive position sensor (I2PS) is a novel device that measures high-precision linear without being affected by radiation and external magnetic fields. Built on the basis of variable differential transformer, I2PS senses variation flux linkage between supply sense coils which related to moving coil. This paper characterizes performance through detailed analysis impact axisymmetrical conductive objects sensor. characterization performed set finite element simulations dedicated...
The Ironless Inductive Position Sensor (I2PS) has been introduced as a valid alternative to Linear Variable Differential Transformers (LVDTs) when external magnetic fields are present. Potential applications of this linear position sensor can be found in critical systems such nuclear plants, tokamaks, satellites and particle accelerators. This paper analyzes the performance I2PS harsh environment collimators Large Hadron Collider (LHC), where uncertainties less than 20 µm demanded presence...
This paper presents a novel reading algorithm for an ironless inductive position sensor which exhibits immunity to single-frequency interference (both high and low frequency signals). is based on the three-parameter sine fitting, whose performances have been enhanced with proper windowing function design. The proposed precision suitability real-time implementation. of new are tested simulated measured signals results discussed in detail. has finally validated target.
Measuring the apertures of Large Hadron Collider (LHC) collimators, as well positions their axes, is a challenging task. The LHC collimators are equipped with high-precision linear position sensors, variable differential transformers (LVDTs). accuracy such sensors limited by peculiar parasitic effect being rather sensitive to external magnetic fields. A new type inductive sensor, Ironless Inductive Position Sensor (I2PS), that keeps advantages LVDTs but insensitive fields has been designed,...