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Vol. 144, No. 9, September 2012, pp. 62-75

 

Bullet

 

Design and Analysis of Bulk Micromachined Piezoresistive MEMS Accelerometer for Concrete SHM Applications
 

1 S. Kavitha, *2 R. Joseph Daniel, 3 K. Sumangala

1, 2 National MEMS Design Centre (NPMaSS),

Department of Electronics and Instrumentation Engineering, Annamalai University, Annamalai Nagar- 608 002, Tamil Nadu, India

* Tel.: 09445112208, fax 04144-239732

3 Department of Civil and Structural Engineering, Annamalai University, Annamalai Nagar- 608 002, Tamil Nadu, India

E-mail: kaviraj_2003@rediffmail.com, josuma.au@gmail.com, josuma@rediffmail.com

 

 

Received:   3 July 2012   /Accepted: 21 September 2012   /Published: 28 September 2012

Digital Sensors and Sensor Sysstems

 

Abstract: Structural Health Monitoring (SHM) using non destructive testing generally involves measurement of shift in natural frequency of the monitored structure. Vibration sensors play a crucial role in such SHM systems and the present day SHM systems use commercially available off the shelf MEMS accelerometers. In this work, an attempt has been made to design a MEMS accelerometer that is specifically intended for concrete SHM applications. This paper presents the design methodology of a MEMS silicon piezoresistive single axis accelerometer with the seismic mass (m) suspended by four symmetrical cantilever beams. The simulation and analysis results using CoventorWare MEMS design tool show that this newly designed accelerometer is capable of measuring vibrations up to 2 g. The modal analysis results indicate that the accelerometers considered for this analysis (Device-A, Device-B, Device-C) using CoventorWare simulation tool has its first mode natural frequency of 1040 Hz and 946 Hz respectively against the specified 900 Hz. The piezoresistive sensitivity of Device-A (with larger mass and optimum stiffness) is found to be the maximum thus demonstrates that the beam length and half side length of the mass should lie in the region (L<a).

 

Keywords: Structural health monitoring, MEMS, Piezoresistive, Single axis Accelerometer

 

 

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