Elektromagnetické senzory

SQUID anteny
radiation resistance - antenna turnover frequency - turning point for the loop resistance and loop inductance
fa = Ra / 2pi La

The length of the coil l is recommended to be about 0.7-0.9 lc
l = dlzka cievky
lc = dlzka jadra
amorphous Metglas core - low noise

MEDA offers sensors with sensitivity 25 mV/nT and noise at 10 kHz equal to 10 fT/√Hz (MGCH-2 sensor with core length about 32 cm) or at 0.2 Hz equal to 25 pT/√Hz (MGCH-3 sensor with core length of about 1 m) [33].