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. 2017 Sep 23;17(10):2195. doi: 10.3390/s17102195

Figure 5.

Figure 5

(a) Calibration results: linear response for all FBGs when the needle is loaded along x and y axes; (b) The force-sensing coordinates relative to the target vein and the histogram of residual errors in each direction; (c) Computed forces vs. the actual forces along the x and y axes [62].