Preliminary design and characterisation of a force and position sensor for a prosthetic finger

Abstract

Modern prosthetic hands often lack force-sensing capabilities or the ability to detect the precise location of applied forces, limiting user feedback and dexterity. This work presents the analysis and preliminary development of a compact and practical force sensor for potential integration into a prosthetic finger. The design incorporates four strain gauges mounted on an internal beam structure to measure both force magnitude and point of application. A prototype was fabricated, and its performance was evaluated across varying force and location ranges. Results showed a mean absolute force error of 4.24% and a mean absolute position error of 2.7 mm. The proposed sensor contributes to advancing tactile sensing in prosthetics, and supports the development of more functional, user appropriate prosthetic hands which can enhance the quality of life for amputees.