Orthogonal Fluxgate for pT-level Field Measurements - Matching the HTS SQUID Performance at Low Frequencies

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Contents of the Talk

An overview of fluxgate technology for sensitive vectorial magnetic field measurement is given, with a focus on advances in orthogonal-fluxgate magnetometers, where the 1-Hz noise ASD was recently pushed below 0.8pT/Hz^-1/2. Such a magnetometer is running in parallel with HTS SQUID for geophysical measurements, where for frequencies below 1Hz, the instruments perform about the same with the fluxgate being more reliable. The low noise of the orthogonal fluxgate also allowed for an unshielded, real-time MCG signal recording.

The important building blocks, such as the sensor core itself, its annealing and excitation and detection electronic are described showing a prospective possibily to further lower the noise by sensor design and/or electronics improvements.

Michal Janošek

Michal Janošek, born in Varnsdorf in 1980, graduated from the Faculty of Electrical Engineering, Czech Technical University (CTU) in Prague in 2007 at the Dept. of Measurement. He did his PhD under the supervision of Pavel Ripka. His main research activity is the application of magnetic sensors in gradiometers and miniaturised fluxgate sensors for detection of low amplitude magnetic fields. Since 2014 he is Assistant professor.

He is author of 77 journal publications, the first from 2007 mentioning miniaturised fluxgate sensors.