Puncture force sensor based on optic-fiber Fabry-Perot interferometer

Abstract

At present, the domestic medical puncture robot is still in the research stage. To meet the need of accurate sensing of puncture force in the surgical process, this paper design and manufacture a high-sensitivity optical fiber puncture force sensor with the advantages of small size, high accuracy, anti-electromagnetic interference and good biological compatibility. In this paper, an extrinsic Fabry-Perot sensor is fabricated using the single mode optical fiber and the capillary tube by the method of arc discharge welding. The sensor is encapsulated in a steel needle to make a probe that can measure the puncture force. The calibration for the sensor is carried out. The experimental results show that the sensor has a measuring range of 0-17 N, a sensitivity of 20.66 nm/N, a resolution of 0.01N and a good linearity. The sensor has the advantages of simple manufacturing process and high sensitivity, which makes it have a good application potential in the field of medical puncture robot.