S. Ranvier
Belgian Institute for Space Aeronomy
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Featured researches published by S. Ranvier.
loughborough antennas and propagation conference | 2011
Diane Titz; Mikko Kyrö; Fabien Ferrero; S. Ranvier; Cyril Luxey; Patrice Brachat; Gilles Jacquemod; Pertti Vainikainen
In this paper, we present a radiation pattern measurement setup for probe-fed millimeter-wave antennas and the associated calibration procedure. Compared to other existing facilities, our setup has one major innovation: it is composed of two rotating arms allowing measuring the radiated field of a probe-fed antenna over the quasi-3D sphere. The calibration challenges and issues encountered at 60 GHz are thoroughly described. We especially detail a dedicated calibration procedure to improve the accuracy of the measurements. To illustrate our methodology, the 3D radiation pattern measurement of a monopole-type antenna etched over a glass substrate is presented. Experimental results are compared versus simulation results.
ieee sensors | 2012
Véronique Rochus; R. Jansen; H.A.C. Tilmans; Xavier Rottenberg; C. Chen; S. Ranvier; Herve Lamy; Pierre Rochus
This paper presents the design, fabrication and preliminary characterization of highly sensitive MEMS-based Xylophone Bar Magnetometers (XBMs) realized in imecs poly-SiGe MEMS technology. Key for our Lorentz force driven capacitively sensed resonant sensor are the combination of reasonably high Q-factor and conductivity of imecs poly-SiGe, our optimized multiphysics sensor design targeting the maximization of the Q-factor in a wide temperature range as well as our proprietary monolithic above-CMOS integration and packaging schemes. Prototypes 3-axis devices were fabricated and characterized. We present optical vibrometer and electrical S-parameter measurements of XBMs performed in vacuum with a reference magnet at increasing sensor separation. The optical oscillation amplitude is well correlated with the magnetic field amplitude. The electrical 2-port measurements, 1st port as Lorentz force actuator and 2nd port as capacitive sensor, also reproduces the designed magnetic field dependence. This opens the way towards the on-chip integration of small footprint extremely sensitive magnetometers.
international conference on thermal mechanical and multi physics simulation and experiments in microelectronics and microsystems | 2011
S. Ranvier; Stéphane Paquay; Sébastien Requier; Herve Lamy; V. Rochus; Laurent Francis; Pierre Rochus
In this paper, several physical phenomena that are usually not taken into account in MEMS simulations are considered for the simulation of a MEMS xylophone bar magnetometer. These phenomena are the temperature dependency of the material properties, the strong coupling between various fields of physics (thermal, electric and mechanical) and the stress produced by the change of temperature inside the structure. It is shown that the temperature dependency of the material properties has a relatively small influence whereas the pre-stress has a significant one. Because of the pre-stressed state, the deformation of the bar at the fundamental frequency is not a typical first mode vibration but it exhibits additional waves between the linkages, where the bar is stressed, which significantly decrease the amplitude of the deflection.
international conference on electromagnetics in advanced applications | 2015
S. Ranvier; Herve Lamy; M. Anciaux; S. Calders; E. Gamby; J. De Keyser
BRAMS (Belgian RAdio Meteor Stations) is a network of radio receiving stations using forward scatter techniques to study the meteoroid population. The main goals are to compute meteoroid flux rates and mass indexes, determine individual meteor trajectories and orbital parameters of meteoroids, and to analyse meteor profiles in order to retrieve physical parameters of the meteoroids. For that purpose, a dedicated beacon is used together with 26 single-antenna receiving stations spread over Belgium, one dual antenna station and one interferometer. The instrumentation of this network is described in this paper.
IEEE Transactions on Plasma Science | 2017
S. Ranvier; M. Anciaux; Pepijn Cardoen; E. Gamby; Ir Sabrina Bonnewijn; Johan De Keyser; Didier Pieroux; J. P. Lebreton
The sweeping Langmuir probe instrument is a part of the payload of PICo-satellite for atmospheric and space science observations (PICASSO), an ESA in-orbit demonstrator. It includes four thin cylindrical probes whose electrical potential is swept to measure both plasma density and electron temperature together with the spacecraft (S/C) potential. PICASSO is a triple unit CubeSat of dimensions
ursi general assembly and scientific symposium | 2011
Herve Lamy; S. Ranvier; J. De Keyser; E. Gamby; S. Calders
340.5~\text {mm} \times 100~\text {mm} \times 100
Archive | 2006
S. Ranvier; Cyril Luxey; Robert Staraj
mm. The orbit is expected to be a high inclination low-earth orbit. The main issue implied by the use of a pico-satellite platform for a Langmuir probe instrument is the limited conducting area of the S/C, which leads to S/C charging and drift of the instrument’s electrical ground during the measurement. A specific measurement technique that includes the simultaneous measurement of the potential and current of different probes has been developed to retrieve consistent current–voltage characteristics that can be used to estimate the plasma parameters mentioned above.
Microwave and Optical Technology Letters | 2012
Diane Titz; Mikko Kyrö; Fabien Ferrero; S. Ranvier; Cyril Luxey; Patrice Brachat; Gilles Jacquemod; Pertti Vainikainen
BRAMS (Belgian RAdio Meteor Stations) is a new facility currently developed in Belgium to detect and study meteors with radio forward scattering techniques. The transmitter is a dedicated beacon and 25 receiving stations (including one interferometer) are spread all over Belgium. The characteristics of BRAMS and the scientific goals of the project will be discussed. Preliminary results for the automatic detection and counting of meteor echoes will be presented as well as initial results obtained with the interferometer. The methods planned to calculate meteoroid flux densities and trajectories of individual meteoroids will be discussed.
international conference on thermal, mechanical and multi-physics simulation and experiments in microelectronics and microsystems | 2012
Véronique Rochus; R. Jansen; Xavier Rottenberg; H.A.C. Tilmans; S. Ranvier; Herve Lamy; Pierre Rochus
Archive | 2015
Bena Mero; Kevin A. Quillien; Malcolm McRobb; Simone Chesi; Ross Marshall; Alasdair Gow; Craig Clark; M. Anciaux; P. Cardoen; J. De Keyser; Ph. Demoulin; D. Fussen; Didier Pieroux; S. Ranvier