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Sensors 2017, 17(1), 178;

A Differential Resonant Accelerometer with Low Cross-Interference and Temperature Drift

State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Aviation Key Laboratory of Science and Technology on Inertia, Flight Automatic Control Research Institute, Xi’an 710065, China
Author to whom correspondence should be addressed.
Academic Editor: Stefano Mariani
Received: 12 December 2016 / Revised: 7 January 2017 / Accepted: 10 January 2017 / Published: 18 January 2017
(This article belongs to the Collection Modeling, Testing and Reliability Issues in MEMS Engineering)
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Presented in this paper is a high-performance resonant accelerometer with low cross-interference, low temperature drift and digital output. The sensor consists of two quartz double-ended tuning forks (DETFs) and a silicon substrate. A new differential silicon substrate is proposed to reduce the temperature drift and cross-interference from the undesirable direction significantly. The natural frequency of the quartz DETF is theoretically calculated, and then the axial stress on the vibration beams is verified through finite element method (FEM) under a 100 g acceleration which is loaded on x-axis, y-axis and z-axis, respectively. Moreover, sensor chip is wire-bonded to a printed circuit board (PCB) which contains two identical oscillating circuits. In addition, a steel shell is selected to package the sensor for experiments. Benefiting from the distinctive configuration of the differential structure, the accelerometer characteristics such as temperature drift and cross-interface are improved. The experimental results demonstrate that the cross-interference is lower than 0.03% and the temperature drift is about 18.16 ppm/°C. View Full-Text
Keywords: accelerometer; quartz resonator; low temperature drift; low cross-interference accelerometer; quartz resonator; low temperature drift; low cross-interference

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Li, B.; Zhao, Y.; Li, C.; Cheng, R.; Sun, D.; Wang, S. A Differential Resonant Accelerometer with Low Cross-Interference and Temperature Drift. Sensors 2017, 17, 178.

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