Two new wearable devices have been developed that could change the pattern of scattered light to monitor biometrics by tracking glucose concentration or by monitoring pulse.
The glucose sensor is the first wearable device that can measure glucose concentration directly but noninvasively, the authors say.
And while other wearable devices have been made to monitor pulse, the authors claim their new design would be less sensitive to errors when the wearer is in motion, for example while walking or playing sports.
When the material that is scattering the light is moving-say, in the case of blood flowing through the circulatory system-"the speckle pattern changes with changes in the flow," explained biomedical engineer Mahsa Nemati, a graduate student in the Optics Research Group at the Delft University of Technology in the Netherlands and the lead author of the Biomedical Optics Express paper on monitoring pulse. Those light variations are a valuable source of information, she says.
The papers have been published in The Optical Society's (OSA) open-access journal Biomedical Optics Express.