Abstract:Aiming at the problems that current multidimensional force sensors can hardly simultaneously take into account electromagnetic interference, complicated wiring, large dimensional coupling and low sensitivity, this paper presents a twodimensional force sensor based on fiber Bragg grating. Firstly, based on the theories of fiber Bragg grating sensing and bending deformation of simply supported beam, a sensor elastic body with cross beam structure is designed, and the mapping relationship between the fiber grating sensor wavelength drift and the force is derived. Then, the finite element analysis method is used to study the strain distribution characteristics of the elastic body and determine the optimal sticking position of the fiber Bragg grating. Finally, an experiment calibration platform was established to conduct experiment research on the sensitivity, linearity, interdimensional coupling error and repeatability error of the sensor. The experiment results show that the wavelength sensitivities of the sensor in the x and y directions are approximately 7464 and 7520 pm/N, the linearities are approximately 3% and 2%, the interdimensional coupling errors are approximately 101% and 0218% and the repeatability errors are approximately 4898% and 5828%, respectively. The sensor can be applied to twodimensional force measurement of the wrist of the robot and has great significance for improving the highprecision control feedback of the robot joint.