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A Modified Radiometer for Temperature and Microwave Properties Measurements of Biological Substances

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4 Author(s)
Mamouni, A. ; Centre Hyperfréquences & Semiconducteurs - Université de Lille 1, E.R.A. au C.N.R.S. No 454 - Bât P3 - BP 36 - 59650 VILLENEUVE D''ASCQ - FRANCE ; Bliot, F. ; Leroy, Y. ; Moschetto, Y.

The use of radiometers for biomedical applications needs a coherent understanding of thermal signals emitted by the tissues. In this paper, we show first, that some precautions have to be taken when measuring a temperature by the classical radiometric method. For instance, the signal emitted by a lossy material depends on its temperature, permittivity and thickness. This remark allows us to find out a new method for measuring microwave permittivity of liquids when using a Dicke radiometer. We propose a modified radiometric method to determine directly the temperature of the material whatever its reflection coefficient. The applicability of this method is tested with a X band set-up including FET microwave amplifiers. Possibilities of using probes for in situ temperature measurements are discussed.

Published in:

Microwave Conference, 1977. 7th European

Date of Conference:

5-8 Sept. 1977