动力调谐陀螺动态误差的两种补偿方案

本文针对动力调谐陀螺的动态误差模型，提出了动力调谐陀螺的动态误差补偿的计算机算法。算法中的输出值是角增量，它是二次拟和函数。该算法具有精度高，实时性好的特点。     

一维可调谐非磁化等离子体光子晶体的滤波特性

用时域有限差分(Finite-Different Time-Domain,FDTD)的分段线形电流密度卷积(Piecewise Linear Cur-rent Density Recursive Convolution,PLCDRC)算法研究了含单一介质缺陷层的一维非磁化等离子体光子晶体的滤波特性.从频域角度分析得到微...     

基于溴钨灯和LED积分球光源的可调谐光谱分布及光谱匹配

采用溴钨灯和恒流驱动的LED混合作为积分球内部光源,提出了模拟退火算法作为光谱匹配算法,研究了光谱分布可调谐积分球光源的光谱匹配技术.仿真实验表明,该混合光源完全能够定量地模拟CIE-D65和等能光谱分布,且在辐射功率优于LED模拟结果的前提下,LED的数量分别减少79.8％和82.9％,平均相对误差分别减小10％和4...     

Modified adaptive algebraic tomographic reconstruction of gas distribution from incomplete projection by a two-wavelength absorption scheme

A modified adaptive algebraic reconstruction technique (MAART) with an auto-adjustment relaxation parameter and smoothness regularization is developed to reveal the tomographic reconstruction of H 2 O distribution in combustion from incomplete projections. Determinations of relaxation parameter and regularization factor are discussed with regard to the consideration of improvement in reconstruction and reduction of computational burden. A two-wavelength scheme from tunable diode laser absorption measurement, 7444.36 and 7185.59 cm 1 , is used to simplify the nonlinear solution problem for obtaining the tomographic distributions of concentration and temperature simultaneously. Results of calculations demonstrate that MAART can perform the reconstruction results more efficiently with little complex modification and much lower iterations as compared with the traditional algebraic reconstruction technique (ART) or simultaneous iterative reconstruction technique (SIRT) methods. The stability of the algorithm is studied by reconstruction from projections with random noise at different levels to demonstrate the dependence of reconstruction results on precise line-of-sight measurements.     

Design and analysis of a novel tunable optical power splitter

A novel tunable optical power splitter,with a Y-branch waveguide based on the total internal reflection and a microprism with tunable index refraction,is presented.Numerical simulation of its optical performance shows that a high dynamic range,low optical loss,and relatively low wavelength-dependence can be achieved.This component offers numerous advantages such as ease for fabrication,low cost,and compact size,which are very useful for potential application in integrated optical devices.     

可调光瞳滤波器的轴向焦移及扩展焦深

光学超分辨、焦深扩展及焦移3种效应一直受到研究人员的关注,且在光学显微成像、光学校准、光学相干层析成像及光存储中有着重要的应用.提出一种可调谐光瞳滤波器来实现光学系统的轴向焦移及扩展焦深.该光瞳滤波器由两个完全相同且相互平行的λ/4波片和置于其间的λ/2波片组成,其中λ/2波片分为两个可作相对旋转的区域,并且通过推导得...     

屏蔽电磁波和红外的激光滤光片研制

为了研制具有高效电磁屏蔽功能的反红外、透1064nm激光的滤光片,基于金属薄膜诱导理论和多层薄膜的干涉原理,设计了诱导滤光膜的膜系结构,并讨论了金属Ag薄膜厚度误差对滤光片光谱性能的影响。采用离子束辅助沉积的方式制备膜系中的介质薄膜,采用离子束溅射方式制备了金属Ag薄膜;利用放大膜厚控制误差的方法,精确地监控薄层金属Ag膜的沉积厚度,同时避免了Ag膜被氧化。通过工艺实验,制备的滤光片在1064nm激光波长的透射率达到88%以上、中长波红外波段反射率达90%以上,对18～36GHz电磁波屏蔽效能达到23dB以上,具有良好的中长波红外及电磁波屏蔽功能。     

傅里叶域锁模扫频激光光源

报道了一种傅里叶域锁模(FDML)的扫频激光光源.扫频激光光源由激光谐振腔和光功率增强单元组成,激光谐振腔主要包含增益介质、调谐滤波器和延迟线.增益介质采用了两个串联的半导体光放大器,调谐滤波器则采用了基于利特罗结构的光栅旋转多面镜.研制的FDML扫频激光光源的中心波长为1290 nm,扫频速度为14.8 kHz,扫频...     

酶标分析仪检定用中性滤光片的校准

提出酶标分析仪检定用中性滤光片的校准方法，并用校准实例对校准方法进行了验证。结合校准方法，根据JJF 1059.1—2012《测量不确定度评定与表示》建立了数学模型，不确定度的来源有测量结果的重复性、分光光度计透射比误差、分光光度计杂散辐射、中性滤光片年稳定性、中性滤光片均匀性，按该校准方法校准的中性滤光片，校准结果的不确定度为U=0.005(k=2)，校准结果能够满足JJG 861—2007《酶标分析仪检定规程》对中性滤光片不确定度U≤0.01(k=2)的要求，可用于开展酶标分析仪吸光度值的校准工作。