An optical coherence tomography (OCT) system with an A-scan rate of 20 kHz was developed for measuring the biomechanical properties of human finger-pad skin. Such an OCT system operates at a center wavelength of 890 nm with a spectral bandwidth of 150 nm resulting in a very good axial resolution of 2.6 μm. The measured sensitivity and sensitivity roll-off of the system were ~93 dB and ~6 dB mm-1, respectively. Elastographic B-scan images of the human finger-pad skin were constructed by using 1000 A-scans. Deformations of the human finger-pad before and after sliding, while pressed against a transparent optical glass plate under the action of 0.5-2 N force, were examined both at the surface and sub-surface. Biomechanical properties, i.e., deformation of the skin, finger-pad/glass interface contact area were studied.
Xuesong Hu, Raman Maiti, Joseph Boadi, Wei Li, Matt J. Carré, Roger Lewis, Steven E. Franklin, and Stephen J. Matcher, "Optical coherence elastography for human finger-pad skin deformation studies," Proc. SPIE 9710, Optical Elastography and Tissue Biomechanics III, 97100C (Presented at SPIE BiOS: February 13, 2016; Published: 9 March 2016); https://doi.org/10.1117/12.2212308.
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