具有振动免疫特性光学谐振腔设计方法研究

窄线宽稳频激光是研制光学原子钟、引力波探测、光学频率合成器以及低噪声微波源等研究的核心部分,由振动噪声引起的频率噪声已成为实现具有更窄线宽、更高频率稳定度激光的主要限制性因素。本文利用Ansys有限元分析的方法,通过优化参考腔的切割深度和支撑位置以及ULE环的尺寸,使得腔镜在振动作用下保持平行同时腔镜各点均具有较低的振动敏感度,避免了由于装配误差引起腔长变化的问题。在对光学参考腔几何尺寸优化设计后,对光学谐振腔不同频率处的振动敏感度进行测试及分析,结果表明在最佳支撑位置下空间三轴方向的振动敏感度均可被抑制至10^-10 g^-1量级,实验结果和仿真结果相吻合。此方法为振动免疫结构腔体的设计提供了一种思路,也为进一步实现具有更高频率稳定度、更窄线宽激光奠定了基础。

A recognition method of vibration parameter image based on improved immune negative selection algorithm for rotating machinery

To overcome the limitations of traditional monitoring methods, based on vibration parameter image of rotating machinery, this paper presents an abnormality online monitoring method suitable for rotating machinery using the negative selection mechanism of biology immune system. This method uses techniques of biology clone and learning mechanism to improve the negative selection algorithm to generate detectors possessing different monitoring radius, covers the abnormality space effectively, and avoids such problems as the low efficiency of generating detectors, etc. The result of an example applying the presented monitoring method shows that this method can solve the difficulty of obtaining fault samples preferably and extract the turbine state character effectively, it also can detect abnormality by causing various fault of the turbine and obtain the degree of abnormality accurately. The exact monitoring precision of abnormality indicates that this method is feasible and has better on-line quality, accuracy and robustness.

消除萨尼亚克光纤电流传感器振动干扰的光纤补偿环研究

与传统电磁式电流互感器相比,基于法拉第效应的光纤电流传感器有许多明显的优点,因而获得了广泛的研究。萨尼亚克(Sagnac)环形电流互感器是在干涉式光纤陀螺结构上发展起来的一种互感器结构。外界环境的振动因素是抑制Sagnac光纤电流互感器的最重要因素之一。为了消除振动对电流互感器测量结果的影响,给出了一种新型的光纤电流互感器免疫方案,其基本原理是增加外部闭环线圈来补偿所受振动影响。利用琼斯矩阵对此种光纤电流互感器结构进行了详细的理论分析。理论分析及实验结果均能证明此种方案可以完全消除电流互感器在实际环境中所受振动因素的不利影响。为高精度Sagnac干涉式光纤电流互感器的实现提供了可行的解决方法。