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�������պ����ѧѧ�� 2004, Vol. 30 Issue (08) :702-704    DOI:
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Analysis of vibration error in digital closed-loop fiber optic gyroscope
Song Ningfang, Zhang Chunxi, Li Lijing, Lin Heng*
School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� Vibration error of fiber optic gyro affect its application performance directly. In order to solve the problem, the main causes of vibration error were analyzed. The expression between the closed-loop gyro output and optical power was conducted, The conclusion is that The inner stress of the fiber coil and the device pigtail caused by vibration leads to the variation of the polarization mode and optical power of propagating light. The vibration status of gyro mechanical structure, especially the resonance feature was analyzed with the method of finite element analysis (FEA) and verified by tests. So from the view of design and technique, some effective measures to improve the dynamic performance are put forward, included disposal of fiber coil and optical device pigtail, resonance free with reasonable structure design and improvement of closed-loop control. The result shows that the methods are valid. In vibration condition, the dynamic precision of fiber optic gyro is near static performance and satisfied application need.
Keywords�� gyroscopes   vibration   error   fiber optics   finite element analysis   closed-loop control     
Received 2003-04-23;
About author: ������(1968-),Ů,�����,������, Songnf@263.net.
������, �Ŵ���, ������, �ֺ�.���ֱջ�����������������[J]  �������պ����ѧѧ��, 2004,V30(08): 702-704
Song Ningfang, Zhang Chunxi, Li Lijing, Lin Heng.Analysis of vibration error in digital closed-loop fiber optic gyroscope[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(08): 702-704
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2004/V30/I08/702
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