OFFSET THERMOSTABILITY OF THE TFS-3 MAGNETOMETRIC SENSORS

Miniature fluxgate sensors with an open magnetic circuit having a simp le and robust design were elaborated. Two kinds of magnetic materials were used as the sensitive elements of the sensors: Vacoperm 100 (Vacu umschmelze-Hanau, Germany) and amorphous Co68.25Fe4.5Si12.25B15 materi al (Institute of Technical Physics, Iasi, Romania). In the work the te mperature dependence of the developed sensors offset was studied. Spec ial technological procedures were used to reduce the effect of tempera ture variations. Using a good protection of the sensor against the the rmal agents (to avoid condense), a good thermostability of the sensor offset was obtained. The temperature drift of the sensor offset has be en calculated of 0.031 and 0.02 nT degrees C-1 respectively over the w hole temperature range - 75 to + 25 degrees C. The employed amorphous material Co68.25Fe4.5Si12.25B15 results are very useful as a magnetic sensing element for fluxgate sensors. (C) 1997 Elsevier Science S.A.