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�������պ����ѧѧ�� 2006, Vol. 32 Issue (11) :1308-1311    DOI:
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���д�, �̳���, ��ӨӨ, ��άΡ*
�������պ����ѧ ������ѧ���繤��ѧԺ, ���� 100083
Resonant sensor with double resonators
Fan Shangchun, Cai Chenguang, Wang Yingying, Xing Weiwei*
School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� A new resonant sensor consisting of two resonators of uniform structure and size is presented. The closed loop control system is composed of two amplitude controllers and an inverter. The frequency characteristics of the two resonators in series are analyzed. It is found that the phase shift of the two resonators in series is 180° at the resonator′s nature frequency. Based on the frequency characteristics, the closed loop system of a resonant sensor with double resonators is designed. When the structure and size of the two resonators is not uniform, the frequency characteristics of the two resonators in series are also analyzed. When there is a little difference between the two resonators in series, they can also be used in a resonant sensor. In the closed loop control system, the phase shifter need not be used. The measurement error brought by the phase drift is avoided, and the ��Q�� factor of the resonant sensor is effectively increased.
Keywords�� resonators   closed loop control systems   phase shifters   ��Q�� factor   sensors     
Received 2006-04-30;
Fund:

������Ȼ��ѧ����������Ŀ(50275009); ���տ�ѧ����������Ŀ(02I51018)

About author: ���д�(1962-),��,���ɹŰ�ͷ��,����,shangcfan@buaa.edu.cn.
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���д�, �̳���, ��ӨӨ, ��άΡ.˫г�������нṹг��ʽ������[J]  �������պ����ѧѧ��, 2006,V32(11): 1308-1311
Fan Shangchun, Cai Chenguang, Wang Yingying, Xing Weiwei .Resonant sensor with double resonators[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(11): 1308-1311
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