Research On The Device For Measuring Microtensile Of Ultra-Thin Fibers

Fiber devices are essential in fiber communication systems and various types of fiber sensing system. During the manufacture of fiber devices, it can not only reduce the volume of device and its corresponding parts, but also significantly improve device performance by using ultra-thin fiber. Reducing the diameter of fiber puts forward higher requirements to micro-tensile measurement during the process of fiber device production. Therefore, research on the device for measuring micro-tensile of ultra-thin fiber has important value for application.The paper which is based on the principle of cantilever-bending and photoelectricity four-quadrant measurement establishes the model of micro-force measuring device, and defines the relationship between the resolution and structural parameters by noise analysis. When the device for measuring micro-force meets the measurement range, Structure parameters are optimized by numerical analysis and the minimum resolution and structural parameters are calculated. The device based on the optimal results for measuring micro-force is built and measuring range, repeatability and resolution of the device is tested. The output signal of device by is fitted by least-squares method.The magnetic field which provides the tension for ultra-thin fiber is simulated by finite element analysis. The tension for ultra-thin fiber is obtained when the relationship between electromagnetic force and wire diameter, coil turns and current power is fitting by numerical analysis. Based on the theory of viscoelastic and the Maxwell model, the model on the micro-tensile when ultra-thin fiber is melt is established. The temperature and stress during the process of melting and stretching is by simulated by finite element analysis. The simulation results show that when the parts of ultra-thin which are near high-pressure heating arc position, the temperature is higher than any other part, and the temperature in the middle arc of two fiber-optic is minimum; the micro-tensile is reducing during the process of melting and stretching, and the micro-tensile of ultra-thin fiber which are near the high heating arc region reaches to the minimum.The system for measuring the micro-tensile of ultra-thin fiber during the process of melting and stretching is established and used for measuring both the micro-tensile and the change during the process of melting and stretching. By changing the parameters of the process for measurement, it can get the discipline of the tension of ultra-thin fiber. Experimental results show that the increasing of the initial micro-tensile strength, melting speed and the distance between measurement device and high heating arc region make micro-tensile decrease significantly.