Self‐Decoupled 3D Motion Sensors for Body‐Posture Reconstruction

Abstract Wearable 3D motion capture is a critical technology that underpins human–machine interactions, metaversing, and telemedicine. However, most existing sensors face challenges in achieving accurate vector perception and efficient decoupling of 3D motion. In this study, self‐decoupled 3D motion sensors are constructed by vertically integrating uniaxial pressure‐ and biaxial strain‐sensing units based on ordered conductive fibers. The developed sensors can specifically perceive body movements and automatically decompose them into a normal‐pressure component and two planar‐strain components along three orthogonal axes, with the intensities of the three‐axis signals indicating the motion amplitude and direction. Notably, the sensors exhibit a directional resolution of 2°, with detection ranges of 100 kPa for stress and 100% for strain, whereas the crosstalk between the two units remains at 2.08% of the full scale. Furthermore, a wearable 3D motion‐capture system is developed, enabling the acquisition of comprehensive movement data, including amplitudes and directions, with an accuracy of 99% for recognizing motion modes. The real‐time reconstruction and visual synchronization of body postures are demonstrated in the virtual reality environment. This study offers an alternative perspective on wearable 3D motion capture for widespread applications in intelligent societies.