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# 电子工程代写|光子简介代写Introduction to Photonics代考|TFE4166 IRRADIANCE AND MAXIMUM PERMISSIBLE EXPOSURE (MPE)

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## 电子工程代写|光子简介代写Introduction to Photonics代考|IRRADIANCE AND MAXIMUM PERMISSIBLE EXPOSURE (MPE)

How is protective equipment chosen for a particular laser application? In addition to the laser wavelength, the power density or irradiance must be considered. Irradiance is a central concept in the discussion of laser hazards and laser classification. It is defined as the power per unit area, and is often (but not always) given the symbol $E$ or $E_{\mathrm{c}}$. The standard (SI) unit of irradiance is $\mathrm{W} / \mathrm{m}^2$, but it is often more conveniently expressed in $\mathrm{W} / \mathrm{cm}^2$.
$$E=\frac{P}{A}$$
In Equation 1.1, $\mathrm{A}$ is the area illuminated by light incident with power $P$. Note that the letter $\mathrm{E}$ is also used to represent energy as well as electric field strength. It is usually clear from the context and always clear from the units which quantity is being considered.

## 电子工程代写|光子简介代写Introduction to Photonics代考|CHOOSING LASER SAFETY EYEWEAR

Protective eyewear in the form of goggles, spectacles, wraps and shields provides the principal protection for the eyes. Some form of laser safety eyewear (LSE) must be worn at all times during operation of Class 3B and Class 4 lasers.
The main considerations when choosing laser safety eyewear are the operating wavelength and power. Eyewear is available for specific lasers or wavelengths (such as helium-neon safety goggles) or designed for a broader spectrum of wavelengths and laser types. Most laser safety eyewear is expensive, often costing several hundred dollars per pair. Eyewear for carbon dioxide lasers is the exception, available for under $\$ 50$per pair from many suppliers. (It should be noted that designer sunglasses can also cost well more than$\$200$ per pair!) Laser eyewear should be treated with care to avoid scratches or other damage that can change the optical properties and make the eyewear susceptible to laser damage.

Comfort and the effect on color vision are also important when choosing laser safety eyewear. If the LSE is uncomfortable or prevents the wearer from seeing, for example, color traces on monitoring equipment, users may not want to wear it. It is also important not to “overprescribe” LSE. If the eyewear makes it impossible to see the beam, alignment will be difficult. Accidents occur when a technician removes the safety eyewear to complete an alignment and is injured by the beam.

## 电子工程代写|光子简介代写光子学介绍代考|IRRADIANCE AND MAXIMUM allow EXPOSURE (MPE)

$$E=\frac{P}{A}$$

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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。