METHOD TO MEASURE RESONANT FREQUENCY Russian patent published in 2014 - IPC G01H13/00 

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement equipment and is designed for the high-precision detection of a resonant frequency using digital methods of signal processing, and also to detect values, which are functionally connected to the resonant frequency of resonators included within radio frequency sensors and used in various fields of engineering and scientific research. The method to measure the resonant frequency is based on serial excitation of various frequencies in a resonator from the specified set and fixation of these frequencies and their appropriate values of the resonator output signal amplitude. Besides, for each of the excitation frequencies they fix amplitude of the output signal after attenuation of a transition process in a resonator, approximate the obtained discrete dependence of the amplitude on the frequency with a continuous function and the resonant frequency of the resonator is determined by the maximum of this function.

EFFECT: reduced error of measurement specified by discreteness of frequencies of the resonator excitation and impact of transition processes in this resonator, as well as availability of noise in the output signal of the resonator.

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