On-line slippage measurement system for optical fiber sensing array

Aiming at the real-time monitoring of position and velocity in smart flexible sliding sensor, a fiber optic sensing module for real-time monitoring of target displacement and velocity was designed. First, the temperature compensation module was used to solve the temperature cross-sensitivity problem; then, based on the analysis of the stress distribution simulation results of the sensing unit, the "meter" type FBG network structure was proposed; finally, the standard pressure gauge and the ball were used to complete the test of the position direction and the speed state, and a target state solution model suitable for this structure was proposed. The simulation results show that the average deformation of the target trajectory is about 0.32 μm, and the attenuation distance width is about 3.0 mm. The experiment carried out a sliding test on a 0.255 kg steel ball. The FBG stress sensitivity was better than 0.0206 nm/N. The FBG center wavelength offset can accurately determine the location of the object and the direction of the object's movement. The sensor module can monitor the movement state of the object in real time, and intelligently adjust the force and posture of the object. The results show that the plane positioning accuracy, motion angle and speed conversion of the sliding sensor system meet the design requirements, and according to the model function relationship, it can be known that the control of accurancy of the position, angle and speed can be achieved when adjusting the total amount of FBG in the sensor network. In summary, the system has the capability of real-time monitoring of the target position and movement status in the detection area, and is suitable for technical fields such as flexible intelligent assembly and intelligent bionic skin.