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激光陀螺抖动偏频优化研究 总被引:2,自引:1,他引:1
基于频率调制理论,分析、仿真计算了正弦抖动偏频和优化后的正弦抖动偏频条件下,激光陀螺输入-输出曲线的特点.结果表明:正弦抖动偏频时激光陀螺的输入-输出曲线在抖动频率的倍频点处存在着动态锁区,其宽度与激光陀螺静态锁区、抖动角振幅有关.采用优化后的正弦抖动偏频可以很好地克服动态锁区,大大提高激光陀螺输入-输出曲线的线性度.试验对比了正弦抖动偏频和优化后的正弦抖动偏频条件下激光陀螺的输出性能.试验结果表明:采用优化后的正弦抖动偏频显著提高了陀螺准确度. 相似文献
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抖动偏频激光陀螺速率阈值特性研究 总被引:9,自引:9,他引:0
本文从理论上分析了正弦抖动偏频激光陀螺速率阈值特性,提出了一种用于测试抖动偏频激光陀螺速率阈值的试验方案,结果表明激光陀螺在零速率处存在与理论相符合的小死区,动态锁区值与陀螺速率阈值具有确定的对应关系。 相似文献
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从激光陀螺的锁区理论模型出发,通过研究激光陀螺的锁区、综合背向散射以及光强信号之间的关系,分析了光强信号中所包含的锁区信号的特性,设计了滤波处理电路和信号提取算法,通过多阶滤波、精确采样和坐标变换跟踪,将光强信号中提取出的锁区信号进行控制,抑制了综合背向散射,充分发挥光学器件的性能,可降低激光陀螺仪长时间工作产生的零偏... 相似文献
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V. K. Sakharov 《Technical Physics》2011,56(8):1135-1141
It is assumed that the process of lock-in in a ring laser has a finite transient time. This assumption serves as a basis for
developing a semiconductor laser gyro. A semiconductor optical amplifier is applied as an amplifying medium, and a ring resonator
represents a long optical fiber. The injection of an external single-frequency light into a ring resonator with subsequent
circulation of counterpropagating waves is used. The light characteristics of the semiconductor laser gyro are discussed,
and the rotation sensitivity of the gyro is demonstrated. 相似文献
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<正>Theoretical analysis and experimental research on the polarization properties of output light in gyro are carried out to investigate the phenomenon that the amplitude of an output voltage signal is modulated by dither bias in laser gyros consisting of totally reflecting prisms.Taking the effect of prism stress birefringence into account,an analytical formula of the output light intensity in the gyro and the relationship between the polarization parameter and the amplitude modulation of the output signal are obtained and discussed.For the first time,the polarized power value of the output light is adopted as a basis to estimate the output signal amplitude fading extent of laser gyros.Experimental results demonstrate that when the value of polarized power of output light is below 25.5%of that in ideal static case,the standard error is over 0.0337 dBm,and the displacement extent of the prism is higher than 53%of the radius of the beam waist in the gyro cavity,the amplitude modulation extent of gyro output signal can reach up to 16%,which badly influences the measurement accuracy of the laser gyro.Using this polarized power detecting measurement method can repair the gyro immediately during its fabrication process,improve the testing and production efficiency and shorten the product development cycle. 相似文献
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Electrical crosstalk-coupling measurement and analysis for digital closed loop fibre optic gyro
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The phase modulation and the closed-loop controller can
generate electrical crosstalk-coupling in digital closed-loop fibre
optic gyro. Four electrical cross-coupling paths are verified by
the open-loop testing approach. It is found the variation of ramp
amplitude will lead to the alternation of gyro bias. The amplitude
and the phase parameters of the electrical crosstalk signal are measured
by lock-in amplifier, and the variation of gyro bias is confirmed to
be caused by the alternation of phase according to the amplitude of
the ramp. A digital closed-loop fibre optic gyro electrical
crosstalk-coupling model is built by approximating the electrical
cross-coupling paths as a proportion and integration segment. The
results of simulation and experiment show that the modulation signal
electrical crosstalk-coupling can cause the dead zone of the gyro when a
small angular velocity is inputted, and it could also lead to a
periodic vibration of the bias error of the gyro when a large angular
velocity is inputted. 相似文献
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基于有差伺服调节技术,实现了外置光学谐振腔的共振频率与钛宝石激光器工作频率的锁定.该技术采用压电陶瓷作为执行元件,通过对压电陶瓷的调制,实现了对透射激光功率的调制,并由锁相放大器解调获得伺服信号,该伺服信号经过高压放大器放大后控制压电陶瓷的伸缩来调控谐振腔的腔长,从而使腔的共振频率锁定在激光频率上.当激光上作于单一频毕时,谐振腔的谐振频率可以长时间地与激光频率保持锁定,锁定后腔的透射光功率相对起伏的稳定性为2%.当激光频率扫描时.谐振腔的谐振频率可以在2 GHz范围内不间断地与激光频率保持锁定. 相似文献
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Scale factor of a constant rate biased ring laser gyro (RLG) is studied both theoretically and experimentally.By analyzing experimental data, we find that there are three main terms contributing to the scale factor deviation. One of them is independent of time, the second varies linearly with time and the third varies exponentially with time. Theoretical analyses show that the first term is caused by experimental setup,the second and the third are caused by un-uniform thermal expension and cavity loss variation of the RLG. 相似文献