fig8

Figure 8. Principle, structure and application of fibric strain and pressure sensors. (A) Schematic diagram of a chest strap integrated with HFSSs; (B) Routine electrical signals from the HFSS-based chest strap during human respiration^[141]. Copyright 2022, American Chemical Society; (C) Illustration of the yarn-based stretchable sensing device; (D) Photographs of the wearable sign-to-speech interpretation system^[142]. Copyright 2020, Springer Nature; (E) Capacitive soft strain sensor mounted on textile across the knee; (F) Normalized decay time of the sensor output at different walking speeds^[143]. Copyright 2015, John Wiley and Sons; (G) Schematic illustration showing structural change of the pressure sensor under the applied pressure; (H) Photograph of a human hand wearing the smart glove with five pressure sensors on each finger when grabbing an apple; (I) Resistance response of the pressure sensor when grabbing and releasing an apple^[146]. Copyright 2020, American Chemical Society. Application of wearable devices for (J) detecting breathing and (K) monitoring pulses^[147]. Copyright 2019, American Chemical Society; (L) Schematic diagram of a fibric triboelectric sensor in combination with clothing. Reproduced with permission^[151]. Copyright 2020, American Association for the Advancement of Science. HFSSs: Helical fiber strain sensors.