Cart (Loading....) | Create Account
Close category search window

Effects of Wavelength and Optical Path Length in Design of Fingernail Touch Force Sensing

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Abu-Khalaf, J.M. ; Dept. of Mechatron. Eng., German Jordanian Univ., Madaba, Jordan ; Mascaro, S.A.

This paper experimentally identifies the optimal optical parameters for the transmittance of light through the human fingernail bed to measure the change in blood volume beneath the fingernail, which is directly related to touch forces exerted on the fingertip. When forces are applied to the fingertip, various red and white coloration regions occur along the fingernail area, hence the transmittance of light through the fingernail bed is a function of applied force. The fingernail sensor uses optical reflectance photoplethysmography to measure the change in blood perfusion in the fingernail bed where an array of LEDs and photodetectors is mounted on the fingernail surface, and the fingertip force is estimated on the basis of the photodetector outputs. In this paper, we conduct thorough experimental characterization of the sensitivity and efficiency of light transmittance through the fingernail bed to wavelength and optical path length. Results show that the optical parameters for the transmittance of light through the human fingernail bed are optimized when using green light (525 nm) and when the surface mount LED and photodiode are placed as close together as possible.

Published in:

Sensors Journal, IEEE  (Volume:13 ,  Issue: 2 )

Date of Publication:

Feb. 2013

Need Help?

IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.