Low-noise magnetic observatory variometer with race-track sensors

0466154 - GFÚ 2017 RIV GB eng C - Conference Paper (international conference)
Janošek, M. - Petrucha, V. - Vlk, Michal
Low-noise magnetic observatory variometer with race-track sensors.
IOP Conference Series: Materials Science and Engineering. Vol. 108. Bristol: IOP Publishing, 2016, 012026/1-012026/4. ISSN 1757-8981.
[International Conference on Materials and Applications for Sensors and Transducers (IC-MAST2015) /5./. Mykonos (GR), 27.09.2015-30.09.2015]
R&D Projects: GA MŠMT(CZ) LM2015079
Institutional support: RVO:67985530
Keywords : observatory magnetometer * analog to digital conversion * transducers
Subject RIV: DE - Earth Magnetism, Geodesy, Geography

We present a low-noise, high-stability observatory magnetometer with race-track sensors, as developed by the Czech Technical University in Prague for National Observatory of Athens. As opposed to the standard instruments, we used our novel race-track fluxgate sensors with planar oval core which were cut by state-of-the art pico-second UV-laser. The noise performance of the complete electronics and sensor chain is below 6 pT/v Hz @ 1 Hz. The electronics uses 24-bit 200-Hz A/D converter with simultaneous sampling and all digital processing is done in FPGA. The variometer with the sensors mounted on a MACOR cube has been successfully calibrated by scalar method.
Permanent Link: http://hdl.handle.net/11104/0264551