Smart Structures and Systems

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Microcontroller based split mass resonant sensor for absolute and differential sensing

  • Uma, G. (Department of Instrumentation and Control Engineering, National Institute of Technology) ;
  • Umapathy, M. (Department of Instrumentation and Control Engineering, National Institute of Technology) ;
  • Kumar, K. Suneel (Department of Instrumentation and Control Engineering, National Institute of Technology) ;
  • Suresh, K. (Department of Instrumentation and Control Engineering, National Institute of Technology) ;
  • Josephine, A. Maria (Department of Instrumentation and Control Engineering, National Institute of Technology)
  • Received : 2008.06.14
  • Accepted : 2008.10.29
  • Published : 2009.05.25
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Abstract

Two degrees of freedom resonant systems are employed to improve the resonant property of resonant sensor, as compared to a single degree of freedom resonant system. This paper presents design, development and testing of two degrees of freedom resonant sensor. To measure absolute mass, cantilever shaped two different masses (smaller/absorber mass and bigger/drive mass) with identical resonant frequency are mechanically linked to form 2 - Degree-of-Freedom (DOF) resonator which exhibits higher amplitude of displacement at the smaller mass. The same concept is extended for measuring differential quantity, by having two bigger mass and one smaller mass. The main features of this work are the 3 - DOF resonator for differential detection and the microcontroller based closed loop electronics for resonant sensor with piezoelectric sensing and excitation. The advantage of using microcontroller is that the method can be easily extended for any range of measurand.

Keywords

References

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  2. Higher resonant mode effect on the performance of piezo actuated 2-DOF rectangular cantilever shaped resonators (2-DOF RCR) for liquid viscosity and density sensing vol.23, pp.7, 2017, https://doi.org/10.1007/s00542-016-3061-6
  3. A structural tailored piezo actuated cantilever shaped 2-DOF resonators for viscosity and density sensing in liquids vol.247, 2016, https://doi.org/10.1016/j.sna.2016.05.052