METHOD FOR COMPENSATING FOR TEMPERATURE ERROR OF SENSOR WITH VIBRATING ELEMENT Russian patent published in 2008 - IPC G01K7/00 

FIELD: tool-making industry, possible use for measuring force, pressure, acceleration, etc.

SUBSTANCE: in accordance to the method, thermo-dependent resistance is introduced to sensor design with positive temperature resistance coefficient sign relatively to temperature resistance coefficient of already installed thermo-dependent resistance. Thermo-dependent resistance R_α with positive temperature resistance coefficient α_α is meant to compensate for multiplicative temperature error, and thermo-dependent resistance R_β with negative temperature resistance coefficient α_β is meant to compensate for additive temperature error. Preliminary adjustment of circuit for maintaining oscillations of vibrating element under maximal working temperature is performed. Initial frequency of harmonic oscillation generator and deviation of generator frequency from nominal value of measured parameter is recorded for minimal and maximal working temperatures, as well as values of resistances R₁₊ and R₂₊ in the circuit of inverting adder under maximal working temperature. Values of temperature resistance coefficients α_α and α_β of thermo-dependent resistances R_α and R_β respectively are determined. Required values of resistances R_α and R_β respectively are determined. Required values of thermo-dependent resistances R_α and R_β and thermo-independent resistances R_1H and R_2H are determined by solving systems of equations. Nominal values of thermo-dependent resistances R_α and R_β set in the sensor are adjusted to calculated value. Thermo-dependent resistance R_β is coupled serially with thermo-independent resistance R_1H and thermo-dependent resistance R_α is coupled serially with thermo-independent resistance R_2H in the circuit of inverting adder.

EFFECT: increased precision of minimization of temperature error of sensor with vibrating element under conditions of stationary temperature modes.

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