MAGNETOMETER WITH MAGNETIC FIELD SENSOR SIGNAL TEMPERATURE COMPENSATION Russian patent published in 2019 - IPC G01R33/02 G01D3/28 G12B7/00 

FIELD: physics.

SUBSTANCE: invention relates to measurement of magnetic field induction using a magnetometer, for example, a ferroprobe type. Essence of invention consists in conversion of magnetic field induction V_MF to digital or analogue signal S₁ (V_MF) with subsequent compensation of temperature error of primary sensor. Two-stage compensation of measurement results is proposed: S₂ (V_MF, ΔT) = S₁ (V_MF, ΔT) +ΔS₁ (V_MF = 0, ΔT) is a result of first stage compensation, S₃ (V_MF) = S₂⋅K_smart (ΔT) is the result of second stage compensation (final), where ΔT is deviation of temperature from normal, K_smart is coefficient of multiplication. Normal temperature is 20 °C. Temperature error of the magnetometer is considered, which is determined by the temperature dependence of parameters of the primary sensor, for example, a ferroprobe. First step is to compensate for the additive component of temperature error. Second stage is compensation for the multiplicative component of the temperature error. Implementation of the first stage consists in measurement of temperature deviation (ferro probe) from temperature of normal climatic conditions in units of measurement of signal S₁ and summation of result of this measurement with certain weight factor, determined at adjustment stage, with output signal S₁ (V_MF, ΔT) of the magnetometer. Realization of the second stage consists in multiplication of corrected signal of the first stage by coefficient K_smart, whose sign does not change, and value is proportional to temperature deviation ΔT is from normal.

EFFECT: technical result is increase in accuracy of temperature correction of primary magnetometer sensor error.

3 cl, 1 dwg