Resonance Effect in Near Field Microwave Temperature Tomography with Scaning Diffraction Grating

It is demonstrated a resonance property of thermal radiation from elementary layers in the dielectric medium, which are parallel to the medium surface and have periodical temperature spatial distribution along themselves. The microwave thermal radiation from an elementary layer will become of maximum value if the layer temperature variation period is close to the wavelength in the medium. This sort of resonance thermal radiation can be detected by the diffraction grating displacement along the medium surface inside the surface near field zone.