METHOD OF TEMPERATURE ERROR COMPENSATION OF VIBRATION ELEMENT PICKUP Russian patent published in 2008 - IPC G01P15/97 

FIELD: metrology.

SUBSTANCE: invention relates to updating the vibration element pickoff and can be used for measuring forces, pressure, acceleration etc. The proposed method consists in incorporating an extra negative temperature factor heat-dependent capacitance with the vibration pickoff design, since the known pickoff features a resistance positive temperature factor. Heat-dependent resistance R_α compensates a multiplicative temperature error while heat-dependent capacitance C_β compensates an additive temperature error. The vibration element oscillations maintenance circuit pre-tuning is affected at a maximum operating temperature. The oscillator starting frequency and the oscillator frequency departure from the rated magnitude of the measured parameter is recorded. Temperature factors of resistance α_α and capacitance α_β of heat-dependent resistance R_α and capacitance C_β are calculated, respectively. By solving the set of equations, the required heat-dependent resistance R_α and capacitance C_β, heat-independent resistance R_"2Н" and capacitance C_"1ГН".are calculated. By using an electro-erosion or laser adjustment, the rated values of calculated heat-dependent resistance R_α and capacitance C_β are reduced to designed values.

EFFECT: higher accuracy of minimising vibration element pickoff temperature error at constant temperatures.

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