https://research.facebook.com/publications/rotowrist-continuous-infrared-wrist-angle-tracking-using-a-wristband/
RotoWrist: Continuous Infrared Wrist Angle Tracking using a Wristband - Meta Research
We introduce RotoWrist, an infrared (IR) light based solution for continuously and reliably tracking 2-degree-of-freedom (DoF) relative angle of the wrist with...
continuousinfraredwristangle