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We report an optical low angle pass filter (OLAPF) to enhance the signal-to-noise ratio (SNR) using the slanted mirror structure which angle selectively block the light in photoplethysmography (PPG). The reflectance type PPG signal is using the reflected light from the capillary as a signal distorted by the scattered light. The OLAPF can block the light, which scattered by the human tissue, losing...
This paper describes a novel stretchable fingernail sensor for measuring fingertip forces for human-computer interaction. The fingernail sensor uses photoplethysmography to measure the change in blood perfusion in the fingernail bed when the fingerpad touches a surface with various forces. The original fingernail sensor was rigidly attached to the human fingernail, necessitating a customized fabrication...
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