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assignmentutor-lab™ 为您的留学生涯保驾护航 在代写光学Optics方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写光学Optics代写方面经验极为丰富，各种代写光学Optics相关的作业也就用不着说。

• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 物理代写|光学代写Optics代考|Optomechanics

In the context of an optics laboratory, the word “optomechanies” refers to the hardware used to affix optics into their correct relative position and provide any mechanical motion that may be needed in the course of an experiment. Optomechanics are largely standardized so that parts from one manufacturer can usually be used interchangeably with parts from another. The range of optomechanical components available is enormous but there is a core set of parts just about everyone uses: Optical breadboards/tables with a standard grid pattern of threaded holes, posts to raise the optics to the beam height, and optic mounts to be placed on top of those posts. Figure $2.13$ shows a single post set. ${ }^{6}$ The components are laid out on a soft work surface so that if the optic is dropped during assembly, it will not shatter or chip. Gloves are always used to handle an optic. Often gloves will also be used when handling optomechanical components, especially if the optics are going into a vacuum system or some other clean environment. To assemble the set shown, begin by screwing the base onto the post-holder using the short bolt shown. Make sure it is the correct length so that the threads don’t protrude on the inside and reduce the range of motion of the post. After the base is assembled, it should be placed in the approximate correct position on the optical table using the pair of washers and screws shown. If you’re working with a laser, it should be turned off or the laser aperture closed. Usually, the optic’s position needs to be adjusted transverse to the beam rather than along the beam path. So, the orientation of the base should be such that the slots lie perpendicular to the beam path. Note, that in order to protect the base and to allow the slot to move smoothly, the washers should be placed rounded side down. The next step is to attach the post to the optic mount,again using the correct length bolt that mustn’t be allowed to bottom out in the blind hole at the top of the post. Make sure this bolt is tight (but not brutishly so) or else the optic mount will twist loose when you adjust the post orientation during alignment of the optics chain. Now place the optic post into the post-holder and check that the optic will be at the correct height and position. If so, bring it back to the work area and install the actual optic into the mount. Then immediately place it into the optics chain. Align it as best you can with the laser off. Then turn on the laser and finish the alignment. Finally, turn the laser back off and move on to the next optic in the chain.

## 物理代写|光学代写Optics代考|Measurement Error

For any quoted value to be useful, in any context, it must be accompanied by some kind of indication of its accuracy. ${ }^{7}$ Even in cāsual converrsation, it’s typical for the approximatê accuracy of a number to be implied by the context, by tone of voice, or by some other means. For scientific purposes, it’s best to say explicitly what is the estimated error associated with a quantitative statement. Stating measurement errors explicitly also forces us to think about them explicitly, which leads to better science overall. So, the dictum to “always include error bars” annoying to many beginners used to a less formal approach, has a very good rationale. Just don’t take it to unreasonable extremes. There’s no need to record every possible source of error affecting a measurement but it is crucial that you identify and quantify the dominant sources of error.

There are two types of measurement error: Random errors, also called uncertainties, and systematic errors. Random errors are due to any uncontrolled factors that cause a measured value to change randomly between otherwise identical measurements. The histogram of measured values from a large number of identical measurements will generally be Gaussian. The standard deviation of the Gaussian is what is meant by the uncertainty. So, when we are estimating the uncertainty in a measurement, we are guessing at the standard deviation of the histogram that would result from a large number of measurements.

Random errors are introduced at many levels. In measurements taken by hand, where an analog scalle is béing read by a human, one source of random ėrror is simply the process of reading the scale. When humans read a scale as carefully as they can, the scale-reading uncertainty is often about $1 / 5^{\text {th }}$ of the smallest scale gradation. Broadband electronic noise is a source of random error in most electronic measurement devices. For example, the exact time at which a photogate triggers as the light level approaches the predetermined trigger level, may be determined by random fluctuations of the light level causing the gate to trigger ever-so-slightly early or late. Even passive components like resistors have noise associated with the thermal motion of their constituent atoms and molecules, known as Johnson noise. Johnson noise is a form of a more general class of noise known as thermal noise, which afflicts everything from your high-end stereo to radio telescopes and gravitational wave detectors. It causes random fluctuations in these instruments’ output that are not due to the signal being measured (a music track, a pulsar, binary black holes, etc.) Such fluctuations fall into the category of random error. Since random errors lead to histograms that are symmetric about the “true value,” they are reported with in the $a \pm \Delta a$ notation. Unless stated otherwise, the $\Delta a$ reported this way is assumed to represent only the random part of any error, and does not contain the systematic error.

# 光学代考

## 有限元方法代写

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

assignmentutor™您的专属作业导师
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