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Absolute vector measurements based on the scalar Overhauser sensors POS |
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V. Sapunov (1) , J. Rasson (2) , S. Khomutov (3), A. Soloviev (4), P. Borodin(5), O. Kusonsky(5), B. Kuzmenko (6) , Denisov (1), D. Saveliev (1), D. Saveliev (1), S. Kiselev (1) , E. Narkhov(1), A.Sapunov(1) |
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(1) Ural Federal University, Quantum magnetometry laboratory (UrFU, Russia) (2) Institut Royal Meteorologique de Belgique (IRM, Belgium) (3) Institute of cosmophysical research and radio wave propagation (FEB RAS, Russia) (4) Geophysical Center of the Russian Academy of Sciences (GC RAS, Russia) (5) ARS magnetic observatory of the Ural branch of the RAS (Arti UB RAS, Russia) (6) NTP Horizont (Russia) |
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Due to the high absolute precision (up to 0.2 nT) and stability (wide application in the magnetic observatories and hazard monitoring systems. We present new modifications on our magnetometers for measuring the vertical component (POS-3) or the full vector (POS-4) based on the switching bias fields methods [1]. We discuss the long-term experience in their testing at the magnetic observatories ARS (Arti, IGF UB RAS) and PET (Paratunka, IKIR FEB RAS). The absolute accuracy of the measurement of the vertical component of 10-30 nT is achieved. This can be improved to 1-3 nT by use of a self-calibration. This was tested by comparing with a Diflux based on the nonmagnetic theodolite Theo-010. The vertical system titanium frame based on Garrett's Ø110x260 mm solenoid provides long-term stability up to 2 nT/year. The solenoid vertical axis was controlled by spirit levels of 30 angular seconds and with the help of a new high-precision non-magnetic 2D inclinometer providing accuracy of up to 1 arcsec, resolution 0.1 arcsec, temperature range of -40 + 60 C. The creation of a new small-sized solenoid and Overhauser sensor with dimensions 50x100 mm mounted directly on the theodolite telescope similar to DIMOVER [2] is presented in the report. The primary results of the test, showing a sensitivity to the field modulus of 0.02 nT and better than 0.3 nT component along the axis of the solenoid are presented. The technique of self-calibration is developed based on determining the angles of misalignment of the telescope axis and the solenoid when the absolute measurements of the components of the field are measured for different angular orientations. It is assumed that the developed magnetometer and non-magnetic theodolite will be promising for use at stations. A method of self-locking is being developed based on angles of misalignment of the telescope axis and the solenoid when the absolute value of the field components is measured for different angular orientations. The developed magnetometer POS-DIMOVER and non-magnetic theodolite might be useful at points of secular variation of the geomagnetic field .
1. Sapunov, V.A., Denisov, A.Y., Saveliev, D.V., Soloviev, A.A., Khomutov, S.Y., Borodin, P.B., Narkhov, E.D., Sergeev, A.V., Shirokov, A.N. New vector/scalar overhauser DNP magnetometers POS-4 for magnetic observatories and directional oil drilling support (2016) Magnetic Resonance in Solids, 18 (2), art. no. 16209 2. Sapunov, V., Rasson, J., Denisov, A., Saveliev, D., Kiselev, S., Denisova, O., Podmogov, Y., Khomutov, S. Theodolite-borne vector Overhauser magnetometer: DIMOVER (2006) Earth, Planets and Space, 58 (6), pp. 711-716 |
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