Characterization of SOI MEMS capacitive accelerometer under varying acceleration shock pulse durations

Gupta, Nidhi and Vanjari, S.R.K. and et al, . (2021) Characterization of SOI MEMS capacitive accelerometer under varying acceleration shock pulse durations. Microsystem Technologies, 27 (12). pp. 4319-4327. ISSN 09467076

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In this work, the response of the z-axis differential capacitive MEMS accelerometer structure is studied under mechanical shock. The resonant frequency of the accelerometer is 9.12 kHz, and the corresponding time-period (Tn) is 0.11 ms. Simulation of the accelerometer structure under 30 g half-sine acceleration shocks of different durations (0.1–4 ms) revealed that the output amplitude attains the input acceleration shock value when the pulse duration (T) ≥ 0.9 ms. The simulated output time-lag over the input pulse is found to be around 0.2 ± 0.03 msec. The accelerometer showed higher rise-time (10−90 %) and fall-time (90−10 %) for the 0.1–0.5 ms shock pulse durations. The silicon-on-insulator (SOI) MEMS technology is employed to fabricate the accelerometer structure. The packaged accelerometer is tested under the 30 g half-sine acceleration shocks generated by an electrodynamic shaker. The measured output amplitude of the accelerometer achieved the input acceleration value when the shock pulse duration (T) ≥ 9Tn, and the measured time-lag varies from 0.05 to 0.3 msec. The measurement results showed that the output follows the input shock pulse when rise-time (tr) ≥ Tn and fall-time (tf) ≥ 2.7 Tn. The high value of pre-pulse noise is observed for the lower shock-pulse duration (≤ 0.5 ms), and the noise level (peak-to-peak) gets substantially minimized only when T ≥ 27 Tn.

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IITH Creators:
IITH CreatorsORCiD
Vanjari, Siva Rama Krishna
Item Type: Article
Uncontrolled Keywords: Capacitive accelerometers, Electrodynamic shakers, Mechanical shock, MEMS accelerometer, MEMS technology, Pulse durations, Silicon-on- insulators (SOI), Time-periods
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: Mrs Haseena VKKM
Date Deposited: 18 Nov 2021 06:40
Last Modified: 07 Mar 2022 06:10
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