Fig. 1: The working principle of the unconstrained BCG and respiration monitoring system. | npj Flexible Electronics

Fig. 1: The working principle of the unconstrained BCG and respiration monitoring system.

From: Smart wireless flexible sensing system for unconstrained monitoring of ballistocardiogram and respiration

Fig. 1: The working principle of the unconstrained BCG and respiration monitoring system.

a BCG signals generated by the heartbeat. b Generation, transmission, acquisition, and analysis of physiological signals (including BCG and respiratory signals). c Schematic diagram of the sensor’s structural disassembly. GNWs: graphene nanowalls. d Scanning electron microscope image of graphene electrode surface (scale bar: 100 μm). e SEM image of microstructural surface of gradient spherical crown array (scale bar: 100 μm). f Photograph of the flexible sensor (scale bar: 3 cm).

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