In this paper,we present a simulation method to reconstruct the object's imaging in a ghost-imaging system.We use Laguerre-Gaussian(LG) beam as the light source which will produce the Orbital Angular Momentum(OAM)...In this paper,we present a simulation method to reconstruct the object's imaging in a ghost-imaging system.We use Laguerre-Gaussian(LG) beam as the light source which will produce the Orbital Angular Momentum(OAM) states.In the signal arm,the object spatial information is encoded as phase,and added to the phase of the signal light.In the idler arm,the phase of the idler light is changed according to the maximum coincidence rate in the receiver.We get each pixel matched phase of the object and reconstruct the object's imaging in the idle arm.We demostrate some examples of the reconstruction and compare with the other reported method.The results show that our method can improve the resoltuion of the image effectively.展开更多
交流电磁场检测(alternating current field measurement, ACFM)技术广泛应用于制造业等工业领域中金属结构物的缺陷检测。针对单传感器在非预知缺陷检测过程中存在的角度偏转及裂纹定位等问题展开了研究,首先通过COMSOL Multiphysics...交流电磁场检测(alternating current field measurement, ACFM)技术广泛应用于制造业等工业领域中金属结构物的缺陷检测。针对单传感器在非预知缺陷检测过程中存在的角度偏转及裂纹定位等问题展开了研究,首先通过COMSOL Multiphysics仿真结果可知:场强的X和Y方向分量在角度偏转的过程中存在信号互补的规律,然后通过建立比例因子进而实现了数据增广型灰色神经网络模型(data augmented grey neural network model, DA-GNNM)的预测,同时模拟预测对比回归预测可知DA-GNNM模型的预测效果较优。此外通过多梯度偏转仿真实现了偏转裂纹的重构,其次通过搭建实验平台以及信号特征提取等工作验证了DA-GNNM预测模型的合理性,平均预测误差2.56%;最后通过预测角度进一步改善了非平行检测过程中裂纹重构图像的偏转问题。展开更多
文章主要基于某型光纤捷联航姿研制过程中出现的转位后纯惯性姿态发散快的问题开展研究,分析定位问题原因,针对光纤陀螺小角速率标度因数存在的非线性特点,通过误差建模及标定补偿技术,提升小角速率标度因数线性度、航姿对准精度及纯惯...文章主要基于某型光纤捷联航姿研制过程中出现的转位后纯惯性姿态发散快的问题开展研究,分析定位问题原因,针对光纤陀螺小角速率标度因数存在的非线性特点,通过误差建模及标定补偿技术,提升小角速率标度因数线性度、航姿对准精度及纯惯性姿态精度,以满足长时间精度保持的系统要求。工程实测数据表明,该标定补偿技术的应用能够使光纤捷联航姿准确测量地球自转角速率,有效减小对准零位误差,提升长期姿态精度,实现优于4 h 0.5°的姿态指标要求。展开更多
文摘In this paper,we present a simulation method to reconstruct the object's imaging in a ghost-imaging system.We use Laguerre-Gaussian(LG) beam as the light source which will produce the Orbital Angular Momentum(OAM) states.In the signal arm,the object spatial information is encoded as phase,and added to the phase of the signal light.In the idler arm,the phase of the idler light is changed according to the maximum coincidence rate in the receiver.We get each pixel matched phase of the object and reconstruct the object's imaging in the idle arm.We demostrate some examples of the reconstruction and compare with the other reported method.The results show that our method can improve the resoltuion of the image effectively.
文摘文章主要基于某型光纤捷联航姿研制过程中出现的转位后纯惯性姿态发散快的问题开展研究,分析定位问题原因,针对光纤陀螺小角速率标度因数存在的非线性特点,通过误差建模及标定补偿技术,提升小角速率标度因数线性度、航姿对准精度及纯惯性姿态精度,以满足长时间精度保持的系统要求。工程实测数据表明,该标定补偿技术的应用能够使光纤捷联航姿准确测量地球自转角速率,有效减小对准零位误差,提升长期姿态精度,实现优于4 h 0.5°的姿态指标要求。
