Fig. 2: Quantitative measurement of static normal force. | Nature Communications

Fig. 2: Quantitative measurement of static normal force.

From: Behavioral biometric optical tactile sensor for instantaneous decoupling of dynamic touch signals in real time

Fig. 2

a The axisymmetric UCN luminescence image (top) and its pressure distribution profile (bottom) under the normal force using a spherical indenter on the tactile sensor pad. (Scale bar, 2 mm). b Normalized UCN intensity across the centered indented area of the tactile sensor pad with increasing normal force from 0 to 5.0 N. (Scale bar, 2 mm). c Change of upconversion luminescence spectra with increasing normal force from 0 to 5.0 N. d Double y axis graph of integration of gray value of luminescence image (left) and luminescence intensity from 510 to 560 nm wavelength (right). e Loading-unloading hysteresis curves of luminescence signal. f Repeated stability test of luminescence intensity of UCNs-based optical tactile sensor subjected to a 5.0 N normal force over ~5000 cycles. g Response time of our tactile sensor using Gaussian fitting (9.12 ms). Source data are provided as a Source Data file.

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