Passive Subcutaneous Temperature Measurement for Investigation of Thermoregulation

Passive microwave sensors allow subcutaneous temperature measurements in living tissues. A previously presented method was improved and probes were carried out. The accuracy of this apparatus, which works at 9 GHzwith a bandwidth 1 GHz, is tested on lossy liquids and on living tissues (animal). In the case of man, variations of subcutaneous temperature (radiometric method) and skin temperature (thermocouple) are recorded during physical activity. The difference between these two sets of results shows the importance of this non invasive thermographic method for thermoregulation investigation.