Figure 3From: Bioinspired non-invasive radial pulse sensor: from biomimetic design, system calibration, to clinic applicationLong-time aging test result of multiple PDMS samples. (a) Five different hardness PDMS elastic dampers made by five different mixing ratios. (b) The damper made by the mixing ratio 1:2 has the hardness of 30 (after 33-day curing process) that is close to the average hardness of human fingertips.Back to article page