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Research on Lock-in Detection Technology for Micromachined Gyroscopes

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Tutor: LiuSheng GanZhiYin
School: Huazhong University of Science and Technology
Course: Subtle manufacturing engineering
Keywords: Weak signal,Lock-in amplification,SCM,Synchronic integrator,¦²-¦¤AD conversion
CLC: TH703
Type: Master's thesis
Year:  2008
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Abstract:
The micromachined gyroscope inertial sensors for measuring angular velocity or angular displacement , with small size, high reliability, the advantages of cheap , has a wide range of applications in the automotive, electronics , and the field of inertial navigation . Gyroscope sensor output of the small signal is weak , the weak signal detection techniques to perform detection , and the detection performance of the circuit directly affects the accuracy of the sensor . Therefore the design of high sensitivity and strong anti-jamming capability detection circuit sensor signal detection is especially important . This paper first analyzes the sources and characteristics of the noise , to know according to the randomness of cyclical and correlation of the signal and noise characteristics of signal processing , noise suppression , to improve the signal-to-noise ratio . Amplifier noise analysis model used and the amplification circuit anti-jamming commonly used method . Second explore several detection methods can improve the anti-noise performance : cross-correlation detection , synchronization integrator lock-in amplifier , ¦²-¦¤AD conversion . And by theoretical calculations derived their works . The use of synchronous integrator having the characteristics of the matched filter is then designed by the cross-correlation detection and synchronization integrator combination of the lock-in amplifier to improve the anti-noise performance of the system . The use of single-chip the MSC1210 digital control better the entire detection system flexibility to adapt to different sensor detects . Comes with 24 - bit ¦²-¦¤A / D converter good low-frequency signal noise immunity , the output resolution of the test results is also higher . Finally , on the basis of design in the front , the choice of a low-noise components and produced a four-layer board lock detection system relevant indicators of the performance test of the entire system , basically the same experimental results with theoretical calculations . The test results show that the lock detection system designed in this paper has a good anti-noise performance , full-scale sensitivity can be achieved 100nV achieve moderate performance indicators of a lock-in amplifier equipment . The results of this study to design a variety of sensors , small dedicated lock detect circuit design also has a good reference value .
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