Remote identification of liquids in a dielectric container using millimeter waves. 4. Multifrequency scanning

Application of multi-frequency radiolocation allows to expand essentially received signals spectrum that increases amount of a target (object) classification identifiers including thermal portraits for radiometric measurements. In this paper it is represented a prototype of measuring radiometric unit allowing to carry out simultaneously contactless radiometric research of liquids in two wavelength ranges: 8-mm and 3-mm. It is developed the method of definition of parameters of capacity (container) where liquids are placed. It is estimated an influence of caustics appearing in case of waves reflections from internal wall of container and also on quality factor, attenuation coefficient and relative factor of container which are distantly measured. In two frequency ranges there are carried out researches of two water solutions and oil processing products (gasoline, dissolvents, diesel fuel). It is shown the liquids with close thermal portraits in identical frequency band due to close physical-chemical parameters, can have different thermal portraits obtained in different frequency bands reflecting dispersion properties of the liquids and they can be used for liquids identification visually or in case of received data processing.