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Vital sign detection is used across ubiquitous scenarios in medical andhealth settings. Contact and wearable sensors have been widely deployed.However, they are unsuitable for patients with burn wounds or infants withinsufficient attaching areas. Contactless detection can be achieved usingcamera imaging, but it is susceptible to ambient light conditions and createsprivacy concerns. Here, we report the first demonstration of a photonic radarfor non-contact vital signal detection to overcome these challenges. Thisphotonic radar can achieve millimeter range resolution based on synthesizedradar signals with a bandwidth of up to 30 GHz. The high resolution of theradar system enables accurate respiratory detection from breathing simulatorsand a cane toad as a human proxy. Moreover, we demonstrated that the opticalsignals generated from the proposed system can enable vital sign detectionbased on light detection and ranging (LiDAR). This demonstration reveals thepotential of a sensor-fusion architecture that can combine the complementaryfeatures of radar and LiDAR for improved sensing accuracy and systemresilience. The work provides a novel technical basis for contactless,high-resolution, and high-privacy vital sign detection to meet the increasingdemands in future medical and healthcare applications.

Photonic Radar for Contactless Vital Sign Detection