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频率伺服
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  frequency servo
     The first one is frequency modulation technology for frequency servo and elimination of main gyro errors. Another is the measurement of Sagnac frequency difference with high accuracy.
     研制微型光学陀螺仪的关键在于用频率调制来实现频率伺服,对主要误差进行有效抑制,以及实现高精度Sagnac频差测量。
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     The key technologies in development of MOG are the frequency modulation technology for frequency servo and elimination of main gyro error, and the measurement of Sagnac frequency difference with high accuracy.
     研制微型光学陀螺仪的关键在于用频率调制来实现频率伺服,对主要误差进行有效抑制,实现高精度Sagnac频差测量。
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     ON FREQUENCIES
     频率
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     ELECTRONIC SERVO VALVE
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  frequency servo
Considering the extremely narrow resonance fringes, it is useful to separate the frequency servo into slow and fast subsystems.
      
The latter value is very close to the one we measured, at least for low-frequency servo operation.
      


Micro optic gyro(MOG) is a new optic gyro based on Sagnac Effect using advanced integrated optic technology. There are two key technologies in development of MOG. The first one is frequency modulation technology for frequency servo and elimination of main gyro errors. Another is the measurement of Sagnac frequency difference with high accuracy. The key to solving these problems is adopting the acoustooptic(AO) frequency shifter. In this paper...

Micro optic gyro(MOG) is a new optic gyro based on Sagnac Effect using advanced integrated optic technology. There are two key technologies in development of MOG. The first one is frequency modulation technology for frequency servo and elimination of main gyro errors. Another is the measurement of Sagnac frequency difference with high accuracy. The key to solving these problems is adopting the acoustooptic(AO) frequency shifter. In this paper theoretical analysis and design are performed for special requirements of MOG. The requirements are:solution of frequency difference is less than 1×10 -6 ,efficient acoustical power is 180 mW,and frequency modulation bandwidth is more than 10 MHz.The dominant technological difficulty of AO frequency shifter is analyzed and the method using DDS technology instead of VCO is proposed.

微型光学陀螺仪是基于Sagnac效应,采用先进的集成光学技术研制的新型光学陀螺仪。研制微型光学陀螺仪的关键在于用频率调制来实现频率伺服,对主要误差进行有效抑制,以及实现高精度Sagnac频差测量。声光移频器是解决这一系列技术关键的一个核心器件。针对微型光学陀螺仪中对声光移频器所提出的百万分之一相对频移精度,调制带宽不低于10MHz,有效声功率大于180mW的特殊要求,对微型光学陀螺仪的核心器件——声光移频器进行了理论分析与设计,研究了它在实现上的主要技术难点,提出采用直接数字频率合成技术来代替一般的压控振荡器激励方案

The micro optic gyro (MOG) is a new optic gyro based on Sagnac effect using advanced integrated optic technology. The key technologies in development of MOG are the frequency modulation technology for frequency servo and elimination of main gyro error, and the measurement of Sagnac frequency difference with high accuracy. The key to solve these problems is adopting the acoustooptic (AO) frequency shifter. Theoretical analysis and design based on AO theory are performed for special requirements of MOG. The...

The micro optic gyro (MOG) is a new optic gyro based on Sagnac effect using advanced integrated optic technology. The key technologies in development of MOG are the frequency modulation technology for frequency servo and elimination of main gyro error, and the measurement of Sagnac frequency difference with high accuracy. The key to solve these problems is adopting the acoustooptic (AO) frequency shifter. Theoretical analysis and design based on AO theory are performed for special requirements of MOG. The requirements are that acoustooptic diffraction efficiency is 3% ̄5%, frequency shift is ±300kHz , and frequency stability in shorttime is less than 10 -8 . The AO frequency shifter was made on K8 glass by means of planar integrated optical technique. Experiment results show that its main characteristics can satisfy the design requirements.

微型光学陀螺仪是基于Sagnac效应,采用先进的集成光学技术研制的新型光学陀螺仪。研制微型光学陀螺仪的关键在于用频率调制来实现频率伺服,对主要误差进行有效抑制,实现高精度Sagnac频差测量。声表面波声光移频器正是解决上述技术关键的一个集成光学核心器件。针对微型光学陀螺仪对声表面波声光移频器所提出的衍射效率为3%~5%,频移范围±300kHz,短期频率稳定度优于10-8这些特殊要求,依据声光理论进行了分析与特殊设计。采用平面集成光学工艺,在K8玻璃基片上研制出声表面波声光移频器。实验结果表明,该器件已初步满足设计要求。

 
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