FIELD: measuring equipment.
SUBSTANCE: in the direction of the surface of the liquid, electromagnetic waves, frequency-modulated according to a linear law, emit electromagnetic waves, receive reflected electromagnetic waves, then the differential frequency signal at the mixer output between the incident and reflected electromagnetic waves is extracted, they are recorded as an array of samples during the period of modulation, calculating its spectrum S and the frequency of its maximum ƒm. Then, at this frequency, the spectrum S is found to the spectrum SI from the number of N spectra recorded beforehand, at N known levels corresponding to the level Li, the mutual correlation function between the spectra of S and Si is calculated, the current level is determined from the frequency of its maximum and the level of Li.
EFFECT: increase in accuracy in the proposed method for measuring the level of liquid and granular media in the tank.
4 dwg
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