It is critical to monitor the structural evolution of complex fluids for optimal manufacturing performance, including textile spinning. However, in situ measurements in a textile-spinning process suffer from the paucity of non-destructive instruments and interpretations of the measured data. This system enables to capture key geometrical and structural information of the fiber under spinning, including the flow kinematics extracted from feature tracking, and the flow-induced morphology and birefringent responses. The birefringent responses of fibers under coagulation are compared with an orientation factor incorporated in the constitutive rheological model, from which a superposed structure-optic relationship under varying spinning conditions is identified.
