Browsing Publikační činnost ČVUT by Author "Dressler M."

Now showing items 1-7 of 7

    • 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 ...

    • 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 ...

    • Identification of geomagnetic pulsations in SQUID data for Space Weather research 

      Author: Saunderson E.F.; Janošek M.; Dressler M.; Nel A.E.; Lotz S.I.; Fourie C.J.
      (IEEE, 2024)
      The SQUID records small geomagnetic variations such as pulsations, which are short period fluctuations of the geomagnetic field at ULF frequencies. To distinguish pulsations from uncorrelated noise, the SQUID data is ...

    • 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. ...

    • Magnetic Calibration System With Interference Compensation 

      Author: Janošek M.; Dressler M.; Petrucha V.; Chirtsov A.
      (IEEE, 2019)
      This paper describes a novel method for calibrating dc-precise magnetometers in the low field range (± 100 μT), which gives acceptable results even in laboratory conditions with significant magnetic interference. By ...

    • 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 ...

    • 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 ...