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A Resonant Microaccelerometer With High Sensitivity Operating in an Oscillating Circuit

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6 Author(s)
Comi, C. ; Dept. of Struct. Eng., Politec. di Milano, Milan, Italy ; Corigliano, A. ; Langfelder, G. ; Longoni, Antonio
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A new micromachined uniaxial silicon resonant accelerometer characterized by a high sensitivity and very small dimensions is presented. The device's working principle is based on the frequency variations of two resonating beams coupled to a proof mass. Under an external acceleration, the movement of the proof mass causes an axial load on the beams, generating opposite stiffness variations, which, in turn, result in a differential separation of their resonance frequencies. A high level of sensitivity is obtained, owing to an innovative and optimized geometrical design of the device that guarantees a great amplification of the axial loads. The acceleration measure is obtained, owing to a properly designed oscillating circuit. In agreement with the theoretical prediction, the experimental results show a sensitivity of 455 Hz/ ( g being the gravity acceleration) with a resonant frequency of about 58 kHz and a good linearity in the range of interest.

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Microelectromechanical Systems, Journal of  (Volume:19 ,  Issue: 5 )