Model of the input device of the radiometric receiver for measuring the profile of the deep temperatures of biological media by non-invasive radio thermometry

Annotation: A model of the input unit of a microwave radiometric receiver is considered for remote temperature measurements in the depth of the biological environment in a non-invasive way, in which a coupler is used on connected transmission lines. The branch of a part of the high-frequency signal of the noise generator comes from the main channel to both working arms of the secondary channel with different values of the transient attenuation coefficients, the difference of which determines the span of the measurement range. This allows to create radio thermometers with specified measurement ranges at the stage of modeling the parameters of the coupler. Using the model of the modified zeroreception method at the basis of the functioning allows reducing the influence on the measurements of the reflection coefficient at the place of application of the applicator antenna to the body and increasing the dynamic characteristics when mapping a biological object.

Keywords: non-invasive method of radio thermometry, microwave radiothermometry, measurement of deep temperatures of biological media