Contactless Detection for Heart Sounds Based on Doppler Radar Sensor

Heart sounds can provide crucial information regarding cardiovascular state. While the widely used heart sound detection methods always need complex signal processing and also require contact sensors. In this work, the feasibility of contactless detection of heart sounds based on Doppler radar sensor is demonstrated through experiments. A custom-designed 24G DC-coupled continuous-wave radar sensor, ECG device and PCG sensor were simultaneously employed to verify the arguments. The experimental results validated that the proposed technique has the potential to obtain the accurate heart sounds' timing information and waveform with low sampling rate (400 Hz) which provides a convenient way to detect heart sounds during daily life.