CONTACTLESS METHOD radio wave level measurement of liquids in tanks

摘要

Contactless radio-wave method for liquid level measurement in the vessel is achieved in that the side surface of the liquid along the normal thereto emit frequency modulated linearly electromagnetic waves, receiving the reflected electromagnetic waves is then isolated beat signal at the output of the mixer between the incident and reflected electromagnetic waves, wherein that produce direct continuous wavelet transformation during the modulation period of the beat signal in the received wavelet spectrum of the beat signal by finding local extrema points, a straight line is extrapolated them, find the point of intersection of this line with the axis of the ordinate scale factors - on the coefficient obtained by converting the function constructed for the used wavelet is determined difference frequency at which the judged level of the liquid in the container.