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Fig. 5 | Nanoscale Research Letters

Fig. 5

From: A Portable Triboelectric Nanogenerator for Real-Time Respiration Monitoring

Fig. 5

The sliding mode TENG respiration sensor for monitoring different breathing rhythms. a Photograph of the TENG sensor worn on the waist for respiration monitoring. b The correspondence between the output voltage signals and the processes of exhaling and inhaling in one breathing cycle. c, d Time histories of the output voltage signals for two volunteers with different waistlines (72.8 cm for c and 98.6 cm for d) and corresponding results of FFT for different breathing rhythms

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