Microwave Doppler transducer for contactless cardiorespiratory monitoring

One presents the results of a study concerning the use of microwave Doppler transducer for contact-less detection of cardiorespiratory activity. The main element of the installation is a microwave Doppler transducer. The Doppler signal resulting from the movement of the anatomical structures is a complex one. The experimental setup also includes an electrocardiograph, a photopletismograph and a pneumatic sensor attached to the thorax to detect breathing motions. At the same time, two types of breathing were identified: the thoracic and the abdominal ones. A good correlation was noticed between the ECG signal and the Doppler signal.