共查询到20条相似文献,搜索用时 93 毫秒
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提出一种利用相位连续可调诱导产生的双艾里光束形成方形光瓶的方法。该方法首先利用二值化后的相位调制出双艾里光束,为了能够实现光瓶能量分布,一个可调控的线性因子被引入到相位调制函数中形成新改进的相位,该相位能够灵活地调节光瓶的大小。数值模拟结果表明高斯光束通过该改进相位调制,能够形成光瓶能量分布的光束。该方形光瓶光束可应用于光镊、原子捕获与操纵。 相似文献
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利用磁铁能在磁性画板上留下轨迹的特点,制作了曲线运动演示仪,该演示仪能够直观地演示曲线运动的速度方向和运动规律,该装置操作简单、效果明显. 相似文献
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本文提出一种构造椭圆的方法,并利用该方法结合开普勒第二定律求解在万有引力作用下的天体运动轨道形状,该方法抛开了复杂的数学积分,只利用简单的几何知识使求解过程简洁化,图像化,能够加强学生对天体运动的理解. 相似文献
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针对基线较短情况下传统的双站三角测距精度不高的问题,利用双站方位历史信息建立了双站无源定位模型,该模型可以利用多种线性估计器来求解。采用最小二乘算法来实现对目标距离的估计。通过仿真实验说明该模型能够实现对目标距离的估计,证明该算法用于无源定位是有效的。 相似文献
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该文从理论上分析了不同泵浦波形下的荧光衰减规律,提出了一种在不同泵浦波形下测量荧光寿命的新方法——双脉冲探测法,即利用探测泵浦脉冲与荧光衰减脉冲的方法测量荧光寿命。通过对样品钕玻璃及Cr:ZnSe晶体的荧光寿命测量表明:利用该方法在不同泵浦波形下能够实现可见及近红外到中红外激光介质的荧光寿命测量。因此,利用该测量方法能够方便、有效的避免通过解卷积求样品荧光寿命的繁琐过程,对测量激光介质在不同泵浦波形下的荧光寿命具有参考价值。 相似文献
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D.E. Aspnes 《Optics Communications》1973,8(3):222-225
An ellipsometry technique, based upon on-line Fourier analysis of the transmitted light intensity of a rotating-analyzer ellipsometer by means of a minicomputer, is presented and discussed. In addition to permitting great data processing flexibility, the method circumvents many difficulties inherent in present analog systems and enables much higher precision to be obtained. 相似文献
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A modulated ellipsometer has been constructed for the study of the optical properties of thin films deposited and maintained in a variety of controlled environments. The ellipsometric technique involves a photoelastic device which modulates the state of polarization of the light beam. Quantities related to the ellipsometric parameters ψ and Δ are extracted simultaneously by synchronous detection of reflected light intensities in two different frequency channels. Signal processing is completed by an on-line computer which samples data at a repetition rate of approximately one data set per second. Once the optical system is aligned, all elements remain rigidly in place; hence, the precision and stability are high. In terms of ψ and Δ, the precision is of the order of 0.001° and stability over one hour is of the order of 0.01°. Various systematic uncertainties limit the absolute accuracy of the measured optical constants to a few percent for high reflectivity materials. Because of its speed, precision, and stability, this ellipsometer is suited both to comparison measurements of samples prepared under different conditions and to time-lapse measurements of a single film in order to observe annealing, gas adsorption, or surface corrosion in process. Preliminary experimental results are presented. 相似文献
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A front—end data acquisition system based on STD BUS for Mossbauer spectroscopy is described. The system operates in both
pulse height analysis and multichannel scaling with high resolution and allows pre—processing or filtering of the data. With
the system, many kinds of computer and/or microcomputer can easily read out Mossbauer experiments data on real time via a
standard interface. The many features of opening architecture is based on the industral control standard bus (STD BUS) managed
by Z80 processor in the system are exposed in the paper. This architecture is able to build up flexible and expanable data
acquisition system. Both a survey of the system hardware capability and a presentation of the sys tem software are exhibited
as well. 相似文献
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航磁姿态数据收录系统设计 总被引:1,自引:1,他引:0
随着计算机的发展,航空磁法测量的磁补偿方式已从手动补偿转变为自动补偿方式,其磁补偿干扰系数的计算,也在补偿标定飞行中自动完成,磁补偿系数的准确程度是由标定飞行所完成动作(摇摆、俯仰、偏航)的准确性来决定,因而对飞机姿态角度的数据记录和显示,可以为航磁补偿质量的评价提供一种依据,还可以在测区做业的数据处理中,检查航磁探头在测区中工作角度的变化,排除航磁探头进入到死区内的干扰数据;因此在航空物探测量中对飞行姿态数据的采集是很有必要的,该软件应用C++Builder编译系统,实现了在航空磁法测量中对航磁数据、GPS数据、飞行姿态动作数据的实时采集、记录和显示,也为补偿软件的开发提供飞行姿态数据的支持。 相似文献
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The bubble size distribution in a cavitation tunnel is obtained via holography by using a Q-switched ruby laser and diffuse illumination of the object volume in an off-axis arrangement. Analysis of the holograms taken is done by scanning their real image with an image dissector camera under computer control and by calculating size and location of the particles using specially designed software. With this digital image processing system nuclei as small as 20 μm in diameter can be detected in order to yield histograms of their size distribution. 相似文献