In this paper, in order to improve the sensitivity of tactile sensor, we proposed and demonstrated a fiber in-line Mach-Zehnder interferometer (MZI) sensor for the measurement of grasp force. The sensor was fabricated by splicing a section of few-mode fiber (FMF) between two single mode fibers (SMFs). The simulation using Rsoft software shows that the sensor has the best performance with the FMF length is 10mm and the core offset is 5um. The mechanical strength of the sensor is improved by using heat shrink tube at the point of optical fiber fusion splicing. The MZI sensor is embedded in the gripper and the force calibration is carried out by using the piezoresistive sensor. The experiment shows that the sensitivity of the sensor is about 6nm/N. The sensor has many advantages including simple fabrication, low cost, and high sensitivity, demonstrating its great application potential in the fields of Human Machine Interface.
Robotic grippers combined with visual-touch sensor fusion have been widely used in the manufacturing industry. However, due to limited control of the force applied to the mechanical gripper, it is hard to achieve stable object grasping. Therefore, to control the force of gripping objects, we propose a robotic rotary gripper fused with light detection and ranging (LiDAR)-tactile. We use LiDAR to obtain distance information and fiber Bragg grating as the tactile sensor for force feedback. In order to ensure the low-loss transmission of the optical signal in the rotation process, the fiber optic rotary joint is employed and assembled into the system. Finally, the experimental results show that our proposed system can achieve a stable grasp of objects with different shapes by precisely controlling the force, which can meet the demands for precise robotic grasping and fast manipulation.
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