Preprint Article Version 1 This version is not peer-reviewed

Design and Optimization of a MEMS-Based Piezoresistive Accelerometer for Head Injuries Monitoring: A Computational Analysis

Version 1 : Received: 18 December 2017 / Approved: 18 December 2017 / Online: 18 December 2017 (15:42:12 CET)

A peer-reviewed article of this Preprint also exists.

Messina, M.; Njuguna, J.; Palas, C. Mechanical Structural Design of a MEMS-Based Piezoresistive Accelerometer for Head Injuries Monitoring: A Computational Analysis by Increments of the Sensor Mass Moment of Inertia. Sensors 2018, 18, 289. Messina, M.; Njuguna, J.; Palas, C. Mechanical Structural Design of a MEMS-Based Piezoresistive Accelerometer for Head Injuries Monitoring: A Computational Analysis by Increments of the Sensor Mass Moment of Inertia. Sensors 2018, 18, 289.

Journal reference: Sensors 2018, 18, 289
DOI: 10.3390/s18010289

Abstract

This work focuses on the design improvement of a tri-axial piezoresistive accelerometer specifically designed for head injuries monitoring where medium-G impacts are common, for example in sports such as racing cars or American Football. The device requires the highest sensitivity achievable with a single proof mass approach, and a very low error (<1%) as the accuracy for these types of applications is paramount. The optimization method differs from previous work as it is based on the progressive increment of the sensor mass moment of inertia (MMI) in all three axes. The work numerically demonstrates that an increment of MMI determines an increment of device sensitivity with a simultaneous reduction of cross-talk in the particular axis under study. The final device shows a sensitivity increase of about 80% in the Z-axis and a reduction of cross-talk of 18% respect to state-of-art sensors available in the literature. Sensor design, modelling and optimization are presented, concluding the work with results, discussion and conclusion.

Subject Areas

piezoresistive accelerometer; sensor design; biomechanical device; head injuries monitoring; TBI

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