球差对调焦函数的影响

红外导引头成像光斑测试仪系统的球差对成像光斑质量有很大的影响,降低了光斑的能量集中度.通过对球差因素影响的研究,构造的调焦评价函数能更精确地分辨最佳像面,从而通过自动聚焦寻找最佳像面位置,是测试仪评价其光学系统质量的一个重要环节.     

基于虚拟仪器的视频图像采集系统设计

应用虚拟仪器技术，在Lab VIEW7．1开发平台上设计了利用IMAQ Vision for LabVIEW基于NI IMAQ 1405图像采集卡的图像采集系统。该系统对CCD电视、红外热像仪等输出的模拟视频图像具有采集能力，且结构简单，扩展方便，效率高，通用性强，显示了虚拟仪器技术的在信息技术研发中的显著优势。     

低速气流三参数动态测量软件初探

本文采用虚拟仪器概念和技术,构建了三孔探针动态测量系统。该系统集成了高速数据采集、储存及现代数据处理模块,通过该系统可动态显示低马赫数下压气机内部流场的总压、静压、速度矢量等物理参数的变化趋势,并可对动态信号进行时域显示和频域分析。系统还具备自动标定、零漂消除及线性度拟合的功能,实现了流场动态测试技术在线处理与测试同步进行的目的。     

Magnitude Estimations for Line Bisection Under Lateral Visuo-Spatial Neglect

Human subjects can bisect a line, with error, even when they have neglect on one side. How this skill, even though inefficient, can be represented in nonlinear psychophysical theory is explored here. A problem for previous theoretical explanations of lateral neglect bisection, where the errors of bisection are reversed in sign for brain-damaged subjects, when very short lines are used as stimuli, is shown not in fact to be a problem for N(onlinear) P(sychophysical) D(ynamics) theory at all, but is exactly what is expected to arise when sensitivities are biassed on one side. It is suggested that an imbalance in channel inputs in a nonlinear system representation has results which do not follow from a more conventional connectionist approach.     

基于改进U-Net的量子点STM图像分割

为提升量子点图像分割精度,降低特征识别误差,提出一种基于改进U-Net的量子点图像分割方法.首先,在预处理阶段,设计了以色彩通道为权值的灰度化算法,以提升后续分割效果.其次,在STM图像分割部分,在原始U-Net结构上引入中间过渡层以均衡网络各层特征.而后,建立数据集,并通过实验对比不同分割算法的精确度、召回率、F-measure.最后,将分割算法应用于量子点的特征识别,并测试了不同分割方式对应用的影响.实验结果显示,改进灰度化方法保留细节信息丰富,明显提升了量子点分割精度;改进U-Net的平均精确率、召回率、F-measure相较原始网络分别提升了13.83%、2.16%、8.13%.同时,实验数据表明由于分割精度的提升,量子点数量、纵横比等特征参数的识别更加精确.     

Computer controlled-flow injection potentiometric system based on virtual instrumentation for the monitoring of metal-biosorption processes

A completely automated flow-injection system was developed for the monitoring of biosorption studies of Cu(II) ion on vegetable waste by-products. The system employed flow-through Cu(II)-selective electrodes, of epoxy-resin-CuS/Ag₂S heterogeneous crystalline type, and computer controlled pumps and valves for the flow operation. Computer automation was done through a specially devised virtual instrument, which commanded and periodically calibrated the system, allowing for the monitoring of Cu(II) ions between 0.6 and 6530 mg L⁻¹ at a typical frequency of 15 h⁻¹. Grape stalk wastes were used as biosorbent to remove Cu(II) ions in a fixed-bed column with a sorption capacity of 5.46 mg g⁻¹, obtained by the developed flow system, while the reference determination performed by FAAS technique supplied a comparable value of 5.41 mg g⁻¹.     

超声波多普勒实验仪

基于多普勒效应原理,分别测得波源的频率和发生相对运动时观测到的频率即可分析出物体相对运动的速度.实验仪以单片机为测控系统核心实现超声波多普勒效应演示实验及速度测量并提供了具体的设计方案与实验结果.同时单片机赋予了仪器以软件为核心的技术特点,具有重塑性与可扩展性.     

多功能夫琅禾费衍射演示仪的研制

针对目前国内夫琅禾费衍射演示仪存在的问题,研制了一种＂多功能夫琅禾费衍射演示仪＂,实现了26种衍射缝的夫琅禾费衍射的演示实验及相应的计算机（变参数）模拟仿真实验,具有演示与仿真一体化、演示种类多、演示效果明显,自动快速、使用方便、功能多样等特点,能够满足光学课程对夫琅禾费衍射进行演示实验的要求。     

Calibration of a multiple axes 3-D laser scanning system consisting of robot, portable laser scanner and turntable

A multiple axes 3-D laser scanning system consisting of a portable 3-D laser scanner, a industrial robot and a turntable is demonstrated. By using a criterion sphere, a robot tool center point (TCP) calibration approach is proposed to calibrate the relation between the laser 3-D scanner and the robot end-effector. In this approach, two different translational motions of robot are first made to determine the rotation part, and then at least three different rotational motions are made to determine the translation part. Meanwhile, by using the criterion sphere, a turntable approach is proposed to calibrate the pose of the turntable relative to the robot. In this approach, several rotational angles of turntable and two different heights of the sphere are made to determine the rotational axis of turntable. Experiment is performed on a portable laser scanner mounted on an industrial robot ABB IRB4400 with a turntable. The experiment results show that the two proposed calibration algorithms are stable and flexible. The application of 3-D measurement is also given to demonstrate the effectiveness and stability of the multiple axes 3-D laser scanning system.