Fig. 4: Application in real-time monitoring of human physiological signals.

a The real-time response of the sensor fixed on the index finger at different bending angles. The photo is an optical image of the sensor worn on a finger. b The pulse on the wrist measured by the sensor at a rate of 72 beats per minute. The photo is an optical image of the sensor worn on the wrist. c The real-time response of the sensor fixed on the back of the human body in different sitting positions. The photo is an optical image of the sensor attached to the back. d Response curves of the sensor mounted on the throat to monitor voice pronunciation. The photo is an optical image of the sensor worn on the throat. e The real-time response of the sensor during finger pressing. The photo is an optical image of the sensor under finger pressing. f Real-time response of the sensor mounted on a foot at different walking frequencies. The photo is an optical image of the sensor attached to a shoe. g The sensing array response mapping of the pressure distributions corresponding to different shapes of ‘I’ (i), ‘F’ (ii), and ‘E’ (iii) and their optical images.