AgOx薄膜的光开关特性和机理研究

用磁控溅射法制备了具有超分辨近场结构的系列薄膜 ,测量了非线性层AgOx 的光开关特性及其结构随温度的变化 ,分析了AgOx 的光开关特性与微结构之间的内在联系     

一种530 MHz低功耗锁相倍频集成电路的研制

为适应星载测控系统小型化、集成化和低功耗的需要，根据国内集成电路工艺条件，设计并制作了一种特高频锁相倍频集成电路。其最高工作频率大于530MHz，功耗小于60mW。介绍了该集成电路的电路原理、工艺和版图的设计方法。     

New Laser Doppler Velocimetry with Wide Dynamic Range and Clear Directional Discrimination

We present a new laser Doppler velocimetry based on self-mixing effect using a single longitudinal-mode verticalcavity surface-emitting laser modulated by a dynamic triangular current. It can indicate the direction of velocity without ambiguity in a wide dynamic range of 5.2-479.9minis. The accuracy of velocity measurement is better than 3.1% in the whole velocity range when a diffusing target is used for measurements. More interestingly, it works very well on different diffusing surfaces, even on a black glossy photographic paper.     

一种改善双镜头大视角二维三角法测距精度的方法

对双镜头二维三角法测距精度的实验研究表明,在大视角下,双镜头二维测距存在较大的测距误差;通过应用小孔成像代替普通镜头成像进行二维测距研究,证明了大视角非近轴光线的镜头失真是造成该误差的主要原因,并且基于实验提出了一种经验修正公式,明显地提高了系统的测距精度和速度.实验结果表明,在50 mm×50 mm的工作区,对应于80°的大视角下,测距系统在x和y方向的平均定位精度均优于2 mm,平均分辨率分别为0.2 mm和0.1 mm.     

100MHz单片模拟锁相IC的研制

本文介绍了100MHz单片模拟PLL IC的研究与设计方法。     

High accuracy wavelength locking of a DFB laser using tunable polarization interference filter

A temperature-tunable polarization interference filter (PIF) made of YVO4 crystal has been presented and applied for wavelength locking of a distributed feedback (DFB) semiconductor laser in dense wavelength-division-multiplexing (DWDM) optical communication systems. This new design offers a flexible way to monitor and then lock an operating wavelength of DFB laser to any preselected point without dead spots. The results show that the laser wavelength can be locked with accuracy better than ±0.01 nm with much relaxed requirement on temperature stability of the filter.     

卫星应答机专用集成电路KD81设计指标

介绍卫星应答机专用集成电路ＫＤ８１的设计与参数指标。     

三角波电流调制半导体激光器自混合效应研究

利用三镜腔理论模型和速率方程,对半导体激光器在三角波电流调制下的自混合效应进行数值模拟,得到了三角波电流调制下的自混合信号,并分析了三角波电流调制下自混合效应的特点以及调制电流参量与系统几何参量的相互依赖关系.实验观察到上升沿和下降沿的频率变化与数值模拟结果一致.     

高精度宽测速范围精确方向判别单模VCSEL自混合LDV

单模VCSEL(Vertical cavity surface emitting laser)激光器自混合LDV(Laser Doppler veloci-tymeter)系统的温度特性和外腔长度Lext(激光器前腔镜到目标散射面之间的光程)可变范围优于多模激光器LDV系统.应用差频模拟锁相环信号处理技术,明显提高了单模VCSEL自混合LDV测速精度和测速动态范围.用多普勒频移,fd的分频跟踪三角波电流调制技术,提高了运动方向判别的精度和动态范围.实验结果表明,在外腔长度为30 mm±3 mm、温度为0℃～55℃、采样时间0.1 s、激光器无温控的条件下,分辨率优于0.2%;在测速范围为30～480 mm/s的条件下,测速精度优于1%;在速度范围为5～480 mm/s的条件下,测速精度优于2%.在电源电压为5 V时,正向运动方向指示电平大于4.9 V,反向运动方向指示电平小于0.1 V.     

Effect of speckle pattern on laser Doppler velocimeters

The effect of speckle pattern on laser Doppler velocimeters is studied theoretically and experimentally. We have found that dynamic speckle patterns can cause error in velocity measurement. Increasing sampling time and using proper signal processing circuits can eliminate this bad effect caused by speckle pattern.The accuracy of velocity measurement is better than 2.1％ in a wide velocity range(4.66-468.86 mm/s)when speckle effects are taken into account.