RESONANT FREQUENCY MEASUREMENT METHOD Russian patent published in 2015 - IPC G01R27/26 

FIELD: measurement equipment.

SUBSTANCE: vibrations with a frequency changing discretely at the specified pitch in direct and reverse direction as per a symmetrical law in the range of variation of the measured resonant frequency are supplied regularly to a resonator input. A random signal is shaped, by means of which vibrations are modulated, which are supplied to the resonator input; an extreme value of amplitude-frequency response of the resonator and frequency corresponding to this extreme value is fixed during each half-period of these changes, and resonant frequency is determined as an average value of fixed frequencies of extreme values for n periods of the specified changes, which is calculated by the formula: n≥(Δ_f/δ_a)²/8, where Δ_f - a frequency tuning step of vibrations supplied to the resonator input; δ_a - required absolute error of determination of a resonant frequency. With that, a random signal is used for modulation of amplitude of vibrations supplied to the resonator input.

EFFECT: higher measurement accuracy.

3 cl, 3 dwg