Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 50-51, Issue -, Pages 535-547Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2014.05.015
Keywords
MEMS resonant sensor; Weak signal detection; Duffing oscillator; Maximum Lyapunov exponent
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Funding
- National Natural Science Foundation of China: integrated testing instrument of resonant silicon microstructure transducer [60927005]
- National Natural Science Foundation of China: Nonlinear vibration characteristics of the direct frequency output micro gyroscope: theory and experiment [61273060]
- Innovation Groups of the National Natural Science Foundation of China Navigation, Guidance and sensing - advanced inertial instruments and systems technology [61121003]
- Innovation Foundation of BUAA for ph.D. Graduates
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In this paper, the application of weak signal detection based on chaotic oscillator is studied in a MEMS resonant beam sensor. Chaotic oscillator can detect weak signal which is submerged in the background of large noise. According to the frequency and phase characteristic of the output vibrating signal, reference current signal with fixed frequency difference and same phase to the output signal is set. Frequency and phase of the signal are fixed by detection resistor which works as a multiplier. By calculating the maximum Lyapunov exponent, detection threshold is obtained, and motion change of detection system is monitored. The results of numerical simulation and experiment show that this method can effectively detect the weak resonant signal and find the resonant frequency accurately by setting the threshold of the chaotic oscillator, and it is immune to the noise. (C) 2014 Elsevier Ltd. All rights reserved.
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