Method to determine dielectric permeability of dielectric object
The invention belongs to the field of electro technique, particularly to the remote determination of dielectric permeability of dielectric objects. The dielectric object at the background of a reflector is radiated by coherent microwave radiation at N-frequencies to produce a three-dimensional (3D) microwave image of the object and reflector. By utilizing multiple cameras a 3D video image is produced, which then is converted into digital format. The 3D video and 3D microwave images are synchronized and then transferred into a general system of coordinates. The dielectric permeability of the object is determined as follows: ɛ = ( z 2 - z 3 z 1 - z 3 ) 2 . where distances Z 1 and Z 2 are between the source of microwave radiation and the reflector, with and without the dielectric object, respectively, and distance Z 3 is between the microwave source and the video image of the dielectric object. This formula allows determining remotely the dielectric permeability of a moving dielectric object of irregular shape.
1. A method to determine a dielectric permeability of a dielectric object, comprising:
radiating the dielectric object and a reflector by coherent microwave radiation at N frequencies, wherein the reflector is a surface reflecting back the coherent microwave radiation;
recording signals reflected from the dielectric object and the reflector;
processing the recorded signals by coherent processing to generate microwave images of the dielectric object and the reflector;
creating a three-dimensional microwave image of the dielectric object and the reflector, wherein the three-dimensional microwave image of the dielectric object is created only for one three-dimensional surface formed with points that have maximal values of intensity in the microwave images of the dielectric object and the reflector;
using two video cameras to produce two video images of an area where the dielectric object is located;
digitizing the two video images and producing a digital three-dimensional video image of the area where the dielectric object is located;
synchronizing the three-dimensional video image with the three-dimensional microwave image;
combining the three-dimensional video image and the three-dimensional microwave image in one coordinate system, and;
determining the dielectric permeability of the object ∈, using the combined three-dimensional video image and three-dimensional microwave image of the one coordinate system, according to the formula:
∈=[( Z 2 −Z 3 )/( Z 1 −Z 3 )] 2 ,
wherein:
Z 1 is a distance between a source of microwave radiation and the reflector of the three-dimensional microwave image where the reflector is not covered with the dielectric object,
Z 2 is a distance between the source of microwave radiation and a section of the reflector of the three-dimensional microwave image where the dielectric object is located,
Z 3 is a distance between the source of microwave radiation and a section of the three-dimensional video image of the area where the dielectric object is located, and
distances Z 1 , Z 2 and Z 3 are all distances from the one coordinate system.