Fig. 2: Flexible TAG sensors for epidermal pulse monitoring.
From: Emerging sensing and modeling technologies for wearable and cuffless blood pressure monitoring
a Pulse sensing mechanism. Reprinted with permission from ref. 21. Copyright 2020 Wiley. b A piezoresistive sensor adhering to the human wrist seamlessly. Reprinted with permission from ref. 22. Copyright 2017 Wiley. c A typical pulse waveform consisting of three characteristic peaks. Reprinted with permission from ref. 21. Copyright 2020 Wiley. d Piezocapacitive sensing mechanism. e A piezocapacitive sensor made of a micropillar dielectric layer, and its pressure transfer curve. Reprinted with permission from ref. 24. Copyright 2019 American Chemical Society. f Piezoresistive sensing mechanism. g A piezoresistive sensor made of a carbon-decorated fabric and its pressure transfer curve. Reprinted with permission from ref. 25. Copyright 2015 Wiley. h Piezoelectric sensing mechanism. i A piezoelectric sensor made of a PZT film and its transfer curve. Reprinted with permission from ref. 26. Copyright 2017 Wiley. j Triboelectric sensing mechanism. k A triboelectric sensor made of woven PTFE stripes and a PET film, together with its sensing mechanism. Reprinted with permission from ref. 27. Copyright 2018 Wiley.
