【摘 要】
：
The resonator integrated optic gyros (RIOGs) based on the Sagnac effect have gained extensive attention in navigation and guidance systems due to their predominant advantages: high theoretical accuracy and simple integration. However, the problems of losi
【机 构】
：
KeyLaboratoryofInstrumentationScienceandDynamicMeasurementofMinistryofEducation,NorthUniversityofChi
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
The resonator integrated optic gyros (RIOGs) based on the Sagnac effect have gained extensive attention in navigation and guidance systems due to their predominant advantages: high theoretical accuracy and simple integration. However, the problems of losing lock and low lock-in accuracy are the bottlenecks, which restrict the development of digital RIOGs. Therefore, a multilevel laser frequency lock-in technique has been proposed in this Letter to address these problems. The experimental results show that lock-in accuracy can be improved one order higher and without losing lock in a variable temperature environment. Then, a digital miniaturized RIOG prototype (18 cm × 18 cm × 20 cm) has been produced, and long-term (1 h) bias stability of 26.6 deg/h is successfully demonstrated.
其他文献
美国斯坦福大学的物理学家们可能在四年内建成一种新型激光器，它在功率、效率和可调谐性方面都可满足商业规模的分离同位素（因而浓缩铀）工业的要术。核工业部门官员对这一发展表示相当大的兴趣。
提出了一种基于低调制度特征进行像素匹配的在线三维测量方法。仅将一固定的正弦条纹投影到在线匀速运动的待测物体上,物体运动产生相应的等效相移变形条纹图。当CCD等步距采集多帧变形条纹时,由于物体的运动致使变形条纹图中物体像素不对应,需要对所采集的条纹图进行像素匹配。在对变形条纹图提取物体调制度信息的基础上,使用大津法进行自动二值化处理,截取物体低调制度区域作为特征模板,实现像素匹配,从而获得物体上点对
In most coherent imaging modality, speckle noise is a major cause that blurs the boundary of tissues and degrades the image contrast. By utilizing the unique properties of supercontinuum (SC) generated by noise-like pulses (NLPs) and a simple multi-frame
美国国家航空与宇宙航行局于上星期宣称，以探索者22号和27号卫星所作的实验表明激光实时电视和深空通讯是完全可能的。
在自动交换光网络(ASON)的控制平面内引入了通用多协议标签交换(GMPLS)协议, 使得光传送网络具备了更大的智能性。在控制平面拓扑和传送平面拓扑一致的情形下, 以GMPLS的“便道”技术为基础, 提出了一种改进型的基于标签交换路径(LSP )“双链路”恢复(DLR)的生存性机制。它对发生故障的节点两端链路同时实施迂回策略。通过对传统的链路恢复和“双链路”恢复进行细致地分析, 定量地给出了在这两种情形下, 信令恢复时间的比较方案。以美国AT
混浊介质的光学参数提取在光动力学疗法及光学无创诊断中有着重要意义。提出了一种实数遗传算法，结合逆蒙特卡罗方法及图形处理单元加速技术，从蒙特卡罗模拟得到的介质表面漫反射光的空间分布中提取光学参数。设计了差值平方和适应值函数、随机竞争选择算子、带扩展半径的均匀随机交叉算子、均匀变异算子、冠军变异算子，保证了算法的收敛性和种群的多样性。在0≤μa≤100 cm-1和0≤μs≤1000 cm-1范围内μa和μs提取的平均相对误差分别为0.25%和0.58%，均方根误差(RMSE)分别为0.32 cm-1和1.68
In this work, a heavily Er-doped fiber with an 8 µm core diameter and a numerical aperture of 0.13 was prepared by the modified chemical vapor deposition (MCVD) technique combined with the sol-gel method. The background loss and absorption coefficient at
Imaging through scattering media via speckle autocorrelation is a popular method based on the optical memory effect.However,it fails if the amount of valid information acquired is insufficient due to
人脸的情感识别在人机交互领域有着重要作用,对人脸表情进行分类也是研究图像情感的一种方法。针对目前公开的人脸表情数据集数据量少,卷积神经网络的结构较复杂、参数多且计算量大、易出现过拟合的现象,需要构建一种针对小数据集的人脸表情分类模型。利用MTCNN模型进行人脸检测后,结合Inception的思想提出一种新的卷积神经网络模型,使用1×1卷积核对特征维数进行缩减,增加并平衡网络深度和宽度的同时不增加额
在铥空心阴极灯中,用波长分别为567.584,571.579,576.020,576.429,589.563及597.126 nm的激光泵浦铥原子,对应各泵浦波长在371～684 nm谱区内观察到相同的约74条荧光谱线,本文确定了相应荧光的跃迁能级及荧光强度。实验证明在空心阴极灯中铥原子能量的碰撞转移现象很剧烈。