Computational analysis and optimization of a MEMS-based piezoresistive accelerometer for head injuries monitoring.

Messina, M.; Njuguna, J.; Palas, C.

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. The device requires the highest sensitivity achievable with a single proof mass approach, and a very low error 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.

Citation

MESSINA, M., NJUGUNA, J. and PALAS, C. 2017. Computational analysis and optimization of a MEMS-based piezoresistive accelerometer for head injuries monitoring. In Proceedings of the 2017 IEEE sensors conference, 29 October - 1 November 2017, Glasgow, UK. New York: IEEE [online], article number 8233897, pages 91-93. Available from: https://doi.org/10.1109/ICSENS.2017.8233897

• Conference Name: 2017 IEEE sensors conference
• Conference Location: Glasgow, UK
• Start Date: Oct 29, 2017
• End Date: Nov 1, 2017
• Acceptance Date: Aug 11, 2017
• Online Publication Date: Oct 29, 2017
• Publication Date: Dec 25, 2017
• Deposit Date: Feb 1, 2018
• Publicly Available Date: Feb 1, 2018
• Print ISSN: 1930-0395
• Publisher: IEEE Institute of Electrical and Electronics Engineers
• Article Number: 8233897
• Pages: 91-93
• Series ISSN: 1930-0395
• ISBN: 9781538640562
• DOI: https://doi.org/10.1109/ICSENS.2017.8233897
• Keywords: Piezo resistive accelerometer; Sensor design; Mechanical sensor optimisation; Biomechanical device; Head injuries monitoring; TBI
• Public URL: http://hdl.handle.net/10059/2707
• Related Public URLs: http://hdl.handle.net/10059/2708