High Capacity Torque and Compression Measurements Using Fibre Optic Sensors

Deformations of objects or structures under applied loads have traditionally been measured using electrical strain gauges. Several techniques are also known for measuring strain along optical fibres, this can be desirable in a range of circumstances, e.g. in systems with space constraints or where many measurement points are required. Optical fibres, however, are known for being fragile and having a low tensile strain limit.This paper presents a realisation of a high capacity, directional torque and compression sensor using a single optical fibre with multiple Fibre Bragg Gratings (FBGs). Our design parameters adjust the sensing range to the expected forces and showcases an application for the mining and drilling industry.