Absolute vector

measurements based on the scalar Overhauser sensors


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)

(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)


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