Microwave based wound healing detection

The paper describes two different approaches for the detection of wound healing. The state of curing of the wound shall be determined without taking off bandages or stickers. Furthermore the curing state in burried layers of tissue shall be supervised. All curing states have to be detected without direct contact to the injured person in order to avoid pain. One approach is to use a coaxial sensor for the low frequency range from 1 GHz to 20 GHz with its fringing fields to measure a complex reflection coefficient in the skin plane. The other approach measures also a complex reflexion signal but at millimetre wave frequencies (77 and 94 GHz), where the material losses have decreased compared to low frequencies. Based on these parameters, the curing status can be derived.