A sub-millinewton resolution biaxial force sensor with temperature self-compensation for vascular intervention

作者：Gan, Lu; Wang, Jiabao; Zhou, Yitong^*

来源：Sensors and Actuators, A: Physical , 2023, 364: 114833.

DOI：10.1016/j.sna.2023.114833

• Fiber optic grating
• Biaxial force sensing
• Temperature compensation
• Minimally invasive surgery
• Cardiac catheterization

This article presents a fiber Bragg grating (FBG)-based highly sensitive micro-biaxial force sensor for vascular intervention surgery. It features a 3D-printed integrated structure incorporating an FBG- embedded cavity at its front end for temperature decoupling and an elliptical arc ball hinge to improve lateral sensitivity. Four FBGembedded fibers are suspended in a circular array within the flexible hinge to minimize lateral strain crosstalk and increase measurement accuracy. Finite-element analysis has been implemented to validate the flexure performance, while both static and dynamic loading experiments have been performed to validate the sensor performance. The experiments revealed resolutions of 0.761 and 0.765 mN, respectively for the two lateral forces within a range of -1 to 1 N, and dynamic measurement error lower than 0.67 % of full scale. Temperature compensation experiments are conducted under loaded conditions for both axes, showing errors of lower than 1.6 % and 1.2 %. The ability to decouple force and temperature will benefit its broad application for vascular intervention surgery.