Faculty of Electrical Engineering

Czech Technical University in Prague

CTU in Prague

MAGLAB - Laboratory of sensors and magnetic measurements

Department of Measurement, Technická 2, 166 27 Praha 6
Tel.: +420 224 352 191, Fax: +420 233 339 929
http://measure.feld.cvut.cz/groups/maglab/

Who we are?

prof. Ing. Pavel Ripka, CSc. - head of the group

doc. Ing. Petr Kašpar, CSc. - magnetic materials, magnetic measurements

doc. Ing. Antonin Platil, PhD. - sensors, magnetopneumography

Ing. Jiri Tomek, PhD. - medical applications

Ing. Pavel Mlejnek - current sensors

Ing. Mattia Butta, PhD. - magnetic sensors, magnetic materials

Ing. Vojtěch Petrucha - magnetic sensors and magnetometers

Ing. Michal Janošek - fluxgate sensors, gradiometers

Ing. Ales Zikmund - calibration, position tracking

Ing. Jan Vyhnánek - magnetic detection systems

Ing. Michal Přibil - fluxgate sensors

Ing. Jan Včelák, PhD. - navigation, applications in buildings

 

 

Our research

  • Applications of sensors, mainly magnetic
  • Development of new magnetic sensors and magnetometers
  • Measurement and calibration systems mainly for space and security applications

Simulations in ANSYS and FLUX3D

Applications

Fundamental research in magnetic materials, magnetic sensors and magnetometers helps to understand complicated physics important for new engineering applications. One of the examples is the research in noise properties of nanocrystalline materials.

Applied research targets on specific new principles which have high potential for applications. Most of our new ideas were born on the border between fundamental and basic research. Some of them were patented, such as new system for location of landmines or new coilless fluxgate sensor.

Development of new sensors and sensor systems serves also for applications, especially to solve problems of our industrial partners. The examples include navigation system for horizontal underground drilling, magnetic sensors for bomb locator and NDT system for oil industry.

PCB fluxgate sensors

Running projects

  • Development of magnetometer and gradiometer for satellites
  • Development of monitoring system for new propulsion engines
  • New current transformers for energy meters
  • Detectors for mine locators
  • System for magnetometric detection of dust particles in the human lungs
  • Magnetic security tags for important documents

Coilless sensors, MIMOSA satellite with our magnetometer on board

Funding

Research projects:

2014-2021 - Center of competence TACR Advanced sensors

2012-2016 - GACR project Nanostructured materials for sensors

2010-2012 - Leonardo project ECEVE

2011-2014 - TACR project Fluxgate gradiometer

2009-2012 - GACR doctoral project Sensors and sensor systems

2008-2012 - FP7 Space project ISP-1 (sensors for rocket motors)

2008-2010 - GACR project "Fluxgate effect in thin films" - award of the president of GACR

2009-2011 - OPPA project "Intelligent buildings"

2003-2006 - STREP project FP6 SENPIMAG (new magnetic sensors)

Scientific collaborations

Universities and research institutes

  • University of Cambridge - testing new magnetic sensor
  • University of Texas, Division of Gastroenterology - measurement of the stomach volume
  • Technical University Athens - development of magnetic field sensors based on nanocrystalline materials
  • Danish Technical university - development and testing of fluxgate sensors for space research
  • Shizuoka University, Hamamatsu, Japan - development of microsensors
  • Universidad Politécnica de Madrid, Spain - technologies for magnetic sensors
  • Institute of Physics Acad. Sci. Praha - development of annealing technologies, magnetic domain imaging
  • Technical University, Vienna - applications of AMR sensors
  • Instituto de Ciencia de Materiales de Madrid - microwires
  • National University of Singapore - development of new sensors for military and medical applications
  • Inonu University, Malatya, Turkey - magnetic thin films, fluxgate sensors

Industrial consulting and research contracts - Main cooperating companies

  • Billingsley Aerospace and Defense, USA - testing of magnetic sensors and magnetometers
  • Brownline, The Netherlands - navigation for underground drilling
  • Exxam Systems LLC, Anchorage, Alaska - NDT of pipes
  • NVE Corporation, USA - research cooperation in new magnetic sensor (GMR and SDT)
  • Schiebel, Austria - development of bomb locator DIMADS, new methods for the detection and classification of landmines
  • Sintef, Norway - research collaboration in piezomagnetic sensors
  • Texas University Hospital, USA - development of in vivo distance sensor
  • Vector Magnetics, USA - development of gradiometer for drilling navigation for oil industry
  • Texas Instruments, USA - magnetic sensors and measurements

Cooperation with EXXAM, Alaska, USA - inspection device for insulated pipeline. Measurements in Chemopetrol Litvínov plant.

Selected publications

Books

  • P. Ripka (ed.): Magnetic Sensors and Magnetometers, Artech, USA 2001
  • P. Ripka, A. Tipek (eds.): Master Book on Sensors, BEN, Praha, 2003
  • P. Ripka, A. Tipek (eds.): Modern Sensors Handbook (ISTE-Willey, 2007)

Book chapters

  • P. Ripka: Precise Vectorial Magnetic Field Sensors, in S. Yurish, M. Gomes (eds): Smart Sensors and MEMS, pp. 203 - 228, NATO ASI Series, Kluwer, 2005
  • P. Ripka, K. Závěta, Magnetic Sensors: Principles and Applications. In: K.H.J. Buschow, editors: Handbook of Magnetic Materials, Vol 18, Elsevier, 2009, pp. 347-420.
  • Pavel Ripka: Electric Current Sensors, pp. 16-1 to 16-14, in: J. G. Webster (ed.): Measurement, Instrumentation, and Sensors Handbook, CRC Presss 2014, ISBN 9781439848913

Journal papers (Only from WoS)

In total >200 papers with >1500 citations.

Recent papers

2016

  • P. Ripka, K. Draxler, R. Styblikova: DC-compensated Current Transformer, Sensors 16 (2016), 114; doi:10.3390/s16010114
  • P. Ripka, M. Přibil, V. Schaffer, M. Snoeij: Flugate sensor with pulse feedback, IEEE Trans. Magn. 52 (2016) Issue: 5     Article Number:  4000704 doi: 10.1109/TMAG.2016.2524516
  • Butta, M.; Ripka, P. Effect of electroplated Ni1-xFex composition on the field-induced anisotropy IEEE Trans. Magn. 52 (2016)  Issue: 5     Article Number:  4000604 DOI: 10.1109/TMAG.2016.2522563
  • M. Butta, M. Přibil, P. Ripka,: Noise dependence on temperature in fluxgates with electroplated core, Sensors and Actuators, 244, 15 June 2016, 310-313, ISSN 0924-4247, http://dx.doi.org/10.1016/j.sna.2016.04.018.
  • P.Ripka, Michal Přibil, V. Petrucha, V. Grim, and K.Draxler: A fluxgate current sensor with an amphitheater busbar, IEEE Trans. Magn. 52 (2016), paper # 4002004 doi:10.1109/TMAG.2016.2540523

2015

  • Vcelak, Jan; Ripka, Pavel; Zikmund, Ales: Long-Range Magnetic Tracking System, IEEE Sens. J.  Vol. 15 (2015) 491-496, DOI: 10.1109/JSEN.2014.2345576  WOS:000345235600005
  • P. Ripka, M. Pribil, M. Butta: Magnetostriction offset of fluxgate sensors, IEEE Trans Magn Volume: 51 , Issue: 1 , Part: 1, DOI: 10.1109/TMAG.2014.2349171, 2015 , Article#: 4000504
  • M. Butta, P. Ripka, M. Janosek and M. Pribil: Electroplated FeNi ring cores for fluxgates with field induced radial anisotropy J. Appl. Phys. 117 , 17A722 (2015) ; http://dx.doi.org/10.1063/1.4914874
  • A. Zikmund, P. Ripka, R. Ketzler, H. Harcken, and M.Albrech: Precise scalar calibration of Braunbek system, IEEE Trans Magn. Volume: 51 , Issue: 1 , Part: 1 DOI: 10.1109/TMAG.2014.2357783  2015 , Article#: 4000704
  • J. Bauer, P. Ripka, K. Draxler, R. Styblikova: Demagnetization of Current Transformers, IEEE Trans Magn Volume: 51 , Issue: 1 , Part: 1 DOI: 10.1109/TMAG.2014.2356574 Publication Year: 2015 , Article#: 4000604
  • J. Včelák, P. Ripka, A. Zikmund, M. Butta: Precise magnetic sensors for navigation and prospection, Journal of Superconductivity and Novel Magnetism 28 (2015) Issue: 3   Special Issue: SI   Pages: 1077-1080
  • M. Butta, L. Kraus, P. Ripka: Effect of stress induced anisotropy on the noise of ring-core,  IEEE Trans. Magn. 51 (2015), Iss.1, Article Number: 4001104
  • P. Sarkar, J. Vcelak, R.K. Roy, A. K. Panda, A. Mitra and P. Ripka “Co -based amorphous material for giant magneto-impedance and fluxgate sensing cores”, IEEE Trans Magn 51 (2015), paper # 2002404
  • Janošek, M. - Platil, A. - Vyhnánek, J.: The Effect of Sensor Size on Axial Gradiometer Performance In: IEEE Transactions on Magnetics. 2015, vol. 51, no. 1, art. no. 4002504, ISSN 0018-9464.
  • Kletetschka, G. - Vyhnánek, J. - Kawasumiova, D. - Nabelek, L. - Petrucha, V.: Localization of the Chelyabinsk Meteorite from Magnetic Field Survey and GPS Data. IEEE Sensors Journal. 2015, vol. 2015, no. 15, p. 4875-4881. ISSN 1530-437X.
  • Petrucha, V. - Janošek, M. - Azpúrua, M. A.: Vector Feedback Homogeneity and Inner Layout Influence on Fluxgate Sensor Parameters. IEEE Transactions on Instrumentation and Measurement. 2015, vol. 64, no. 5, p. 1293-1299. ISSN 0018-9456.
  • Zikmund, A. - Janošek, M. - Ulvr, M. - Kupec, J.: Precise calibration method for triaxial magnetometers not requiring Earth's field compensation.IEEE Transactions on Instrumentation and Measurement. 2015, vol. 64, no. 5, p. 1250-1255. 

2014

  • Veverka, M. Závěta, K. Kaman, O. Veverka, P. Knížek, K., Pollert, E, Burian, M, Kašpar, P..: Magnetic Heating by Silica coated Co-Zn Ferrite Particles. Journal of Physics D: Applied Physics. 2014, vol. 47, no. 6, p. 1-11. ISSN 0022-3727.
  • P. Ripka, A. Zikmund: Testing and Calibration of Magnetic Sensors, Sensors Letters Vol. 11, 2013, pp. 44-49
  • P. Sarkar, M. Janosek, V. Petrucha, J. Vcelak and P. Ripka: Study of Stress Induced Anisotropy in METGLAS 2714A, IEEE Trans Magn. Vol. 50 (2014), Article#: 2007603
  • P. Ripka, J. Vyhnanek, J. Janosek, J. Vcelak: AMR Proximity Sensor with Inherent Demodulation, IEEE Sensors Journal 2014, 3119 – 3123, DOI  10.1109/JSEN.2014.2325406
  • M. Butta, M. Janosek, P. Ripka, L. Kraus, R. Kammouni: Influence of magnetostriction of NiFe electroplated film on the noise of fluxgate, IEEE Trans Magn Vol. 50 (2014), Paper number 4006504 
  • P. Ripka, M. Pribil, M. Butta: Fluxgate offset study, IEEE Trans Magn, Vol. 50 (2014), 4006804  DOI 10.1109/TMAG.2014.2329777

2013

  • Pollert, E. Kašpar, P. Závěta, K. Herynek, V. Burian, M. et al.: Magnetic Nanoparticles for Therapy and Diagnostics. IEEE Transactions on Magnetics. 2013, vol. 49, no. 1, p. 7-10.
  • Nováček, P. Roháč, J. Šimánek, J. Ripka, P.: Metal Detector Signal Imprints of Detected Objects In: IEEE Transactions on Magnetics. 2013, vol. 49, no. 1, p. 69-72. ISSN 0018-9464.
  • P. Ripka, K. Draxler, R. Styblikova: Measurement of DC Currents in the Power Grid by Current Transformer, IEEE Trans. Magn. 49 (2013), 73-76.
  • Zikmund, A. - Ripka, P.: Calibration of the 3D Coil System's Orthogonality In: IEEE Transactions on Magnetics. 2013, vol. 49, no. 1, p. 66-68. ISSN 0018-9464.
  • A. Platil, J. Tomek, O. Pribula, M. Janosek, J. Fischer, and P. Ripka: Magnetopneumography Using Optical Position Reference, Sensor Letters Vol. 11, 2013, pp. 69-73
  • Ludek Kraus, Mattia Butta, and Pavel Ripka: Magnetic Anisotropy and Giant Magnetoimpedance in NiFe Electroplated on Cu Wires, Sensors Letters Vol. 11, 2013, pp. 53-55
  • Pavel Ripka, Mattia Butta, and Antonin Platil: Temperature Stability of AMR Sensors, Sensors Letters Vol. 11, 2013, pp. 74-77
  • M. Butta, P. Ripka, M. Vázquez, G. Infante, L. Kraus: Microwire Electroplated Under Torsion as Core for Coil-Less Fluxgate, Sensors Letters Vol. 11, 2013, pp. 50-52
  • P. Ripka, A. Zikmund: Testing and Calibration of Magnetic Sensors, Sensors Letters Vol. 11, 2013, pp. 44-49
  • Vopalenský, M. - Platil, A.: Temperature Drift of Offset and Sensitivity in Full-Bridge Magnetoresistive Sensors. IEEE Transactions on Magnetics. 2013, vol. 49, no. 1, p. 136-139.

Responsible person: doc. Ing. Milan Polívka, Ph.D.