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. Author manuscript; available in PMC: 2018 Apr 1.
Published in final edited form as: IEEE Sens J. 2017 Jan 17;17(7):1952–1963. doi: 10.1109/JSEN.2017.2654489

Fig. 4.

Fig. 4

Single axis intensity modulated fiber optic force sensor. a) reflective fiber optic sensor from ETH Zurich [30] to measure hand grip force during fMRI. © 2005 IEEE; b) reflective fiber optic sensor from ETH Zurich [8] to measure the grip force between the thumb and the index finger. ©2008 IEEE; c) reflective fiber optic sensor made with 3D printing from Harvard University for cardiac applications. [31] ©2010 IEEE; d) reflective fiber optic sensor with parallel plate structure from Chuo University and Advanced Industrial Science and Technology in Japan [32] ©2010 IEEE.