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 FBG-embedded 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.

本文介绍了一种用于血管介入手术的基于光纤布拉格光栅（FBG）的高灵敏度微双轴力传感器。它采用 3D 打印集成结构，在其前端结合了用于温度解耦的 FBG 嵌入式腔体和用于提高横向灵敏度的椭圆弧球铰链。四根 FBG 嵌入光纤悬挂在柔性铰链内的圆形阵列中，以最大限度地减少横向应变串扰并提高测量精度。通过有限元分析来验证弯曲性能，同时进行静态和动态加载实验来验证传感器性能。实验表明，对于-1至1 N范围内的两个侧向力，分辨率分别为0.761和0.765 mN，动态测量误差低于满量程的0.67%。双轴负载条件下进行温度补偿实验，误差分别低于1.6%和1.2%。解耦力和温度的能力将有利于其在血管介入手术中的广泛应用。