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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: IEEE Trans Biomed Eng. 2015 Sep 15;63(3):463–477. doi: 10.1109/TBME.2015.2476337

Fig. 3.

Fig. 3

Several representative types of wearable PPG sensors: (a) micro-optic reflective sensor with individually tailored otoplastic housing [24]; (b) ear-hook design of reflective sensor [25]; (c) an ear clip transmissive sensor with accelerometer [26]; (d) wireless magnetic earing sensor with accelerometer [27]; (e) a golf-hat with integrated wireless reflective sensor [28]; (f) a wireless transmissive ring sensor with accelerometer [29], [30]; (g) a wireless attachable reflective sensor with receiver module [31]; and (h) Apple Watch [32].