Browsing Publikační činnost ČVUT by Subject "magnetometer"

Now showing items 1-8 of 8

    • 1-pT noise fluxgate magnetometer for geomagnetic measurements and unshielded magnetocardiography 

      Author: Janošek M.; Butta M.; Dressler M.; Saunderson E.; Novotný D.; Fourie C.
      (IEEE, 2020)
      We present the development of a low-noise, fundamental-mode, orthogonal fluxgate magnetometer with four amorphous, annealed ferromagnetic wires. The 1-Hz noise obtained in open-loop and closed-loop is as low as 0.75 and ...

    • Determination of the Overhauser magnetometer uncertainty 

      Author: Ulvr M.; Zikmund A.; Kupec J.; Janošek M.; Vlk M.; Bayer T.
      (FEI, Slovak University of Technology, 2015)
      Overhauser magnetometers are the basic instruments for scalar measurements; however, their accuracy is determined at the time of manufacture only. Because of various effects affecting the gyromagnetic ratio of the used ...

    • Estimation of Angular Deviations in Precise Magnetometers 

      Author: Janošek M.; Saunderson E.F.; Dressler M.; Gouws D.J.
      (IEEE, 2019)
      Capabilities for calibrations of angular deviations of sensor triplets in precise magnetometers were evaluated in a 2.5-meter, triaxial Helmholtz-coil facility. The coil system is located in a magnetically quiet environment ...

    • Low frequency noise investigation of pT-level magnetic sensors by cross-spectral method 

      Author: Janošek M.; Novotný D.; Dressler M.; Saunderson E.
      (IEEE Sensors, 2021)
      We present a simple method to estimate the noise of magnetic sensors running in the Earth’s field range by establishing the cross-power spectrum density during ambient field operation and performing spectral subtraction. ...

    • Offset drift in orthogonal fluxgate and importance of closed-loop operation 

      Author: Butta M.; Dressler M.; Janošek M.
      (Elsevier, 2022)
      In this paper we show an up-to-now unexplained source of offset drift affecting the fundamental mode orthogonal fluxgate. After a sudden change or removal of the magnetic field, we observe an offset transient which lasts ...

    • Parallel Fluxgate Magnetometers 

      Author: Janošek M.
      (Springer, 2016)
      This chapter gives a brief overview of parallel fluxgate development, technology and performance. Starting from theoretical background through derivation of fluxgate gating curves, the fluxgate sensor is explained on its ...

    • Precise calibration method for triaxial magnetometers not requiring Earth's field compensation 

      Author: Zikmund A.; Janošek M.; Ulvr M.; Kupec J.
      (IEEE, 2015)
      A calibration procedure for calibrations of triaxial magnetometers is presented. The procedure uses a triaxial Helmholtz coil system and an Overhauser scalar magnetometer and is performed in the an Earth's field range. The ...

    • Reduction of magnetic noise limits of orthogonal fluxgate sensor 

      Author: Dressler M.; Janošek M.; Butta M.
      (American Institute of Physics, 2021)
      We have further lowered the white noise of an orthogonal fluxgate to about 0.3 pT/√Hz @ 8 Hz. So far, this is the lowest noise reported for a fluxgate magnetometer. The noise reduction was achieved by introducing a JFET ...