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ISEC 2013 Special Gordon Donaldson Session: Remembering Gordon Donaldson - 6 of 7 - A high sensitive magnetometer system for natural magnetic field measurements

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We present our LTS SQUID magnetometer system which contains two SQUID triples with different effective areas. The system was developed to measure the signals of transient electromagnetic method as well as weak natural fluctuations of the Earth magnetic field. The sensors are produced in our recently introduced technology using sub-m Josephson junctions. They provide very high sensitivity which is difficult to be measured directly. Especially, in the low frequency range one has to deal with strong external disturbances. In this work, two methods to estimate the noise from measurements in the Earth's magnetic field at a magnetically quiet site are described. The achieved results are compared to measurements in superconducting and magnetic shielding.