摘要
为了解决光强差稳频系统易受光电元件参量影响的问题,设计了一套用于异面腔四频差动激光陀螺的小抖动稳频系统。采用高频放大和幅度检波电路检出四频差动激光陀螺顺时针(或逆时针)输出光束的拍频幅度,然后用模数转换器采集到数字信号处理器(DSP)内。四频差动激光陀螺正常工作时拍频幅度取极大值,因此可通过对腔长进行小抖动调制实现稳频。利用DSP设计了一套数字式稳频系统,1 s取样的稳频精度为2×10-9,更重要的是稳频点不受光电元件参量变化的影响。设计的小抖动稳频电路精度高、通用性好,对提高四频差动激光陀螺适应恶劣环境的能力有一定的价值。
In order to solve the problem that the frequency stabilization system with light intensity comparison is subject to the parameters of optoelectronic components,a frequency stabilization circuit with small dithering was designed for nonplanar four-mode differential laser gyro.The beat wave amplitude in clockwise（or anticlockwise） light of four-mode differential laser gyro was amplified and detected,and then sampled to a digital signal processor（DSP） via analog to digital converter.Small dithering method could be used to stabilize the frequency of four-mode differential laser gyro under the condition that the beat wave amplitude reaches maximum when the gyro operates steadily.A digital system for frequency stabilization was designed with the DSP.Precision of frequency stabilization was 2×10-9 for 1 s sampling.What′s more important is that frequency stabilization point was immune to variations of parameters of optoelectronic components.The frequency stabilization circuit is precise and universal,so it is of some significance to improvement of capability over severe environment of four-mode differential laser gyro.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第11期3233-3238,共6页
Acta Optica Sinica
关键词
激光器
稳频
四频差动激光陀螺
异面腔
lasers
frequency stabilization
four-mode differential laser gyro
nonplanar cavity
