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# 电子工程代写|光子简介代写Introduction to Photonics代考|TFE4166 Calculating Optical Density for LSE

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## 电子工程代写|光子简介代写Introduction to Photonics代考|Calculating Optical Density for LSE

The lens of the eyewear is a filter/absorber designed to reduce light transmission of a specific wavelength or band of wavelengths. The absorption capability of the lens material is described by the optical density (OD). If $E_{\mathrm{o}}$ is the irradiance incident on an absorbing material and $E_{\mathrm{T}}$ is the irradiance transmitted through the material, the transmitted irradiance is related to the $O D$ by an exponential function:
$$E_T=E_0 10^{-O D}$$
The transmittance $(T)$ of light through an absorber is defined as the ratio of $E_{\mathrm{T}} / E_0$. We can rewrite Equation $1.2$ in a form used commonly with optical filters:
$$T=\frac{E_T}{E_0}=10^{-O D}$$
Thus, an $O D$ of 1 means the filter has reduced the irradiance of the beam to $1 / 10^1=1 / 10$ of its original irradiance and $O D$ of 5 means the filter has reduced the irradiance of the beam to $1 / 10^5=1 / 100,000$ of its original irradiance. The required $O D$ for laser safety eyewear is the minimum $O D$ necessary to reduce the beam to a nonhazardous level. Optical density for a given wavelength is usually labeled on the temple of the goggles or on the filter itself. Often, laser safety eyewear is labeled with the $O D$ for several wavelength ranges.

To calculate the $O D$ required for a particular laser, we need to know the incident radiation on the front surface of the LSE, $E_0$. The irradiance transmitted by the LSE cannot exceed the maximum permissible exposure (MPE). If we replace $E_{\mathrm{T}}$ in Equation $1.2$ with MPE, we get
$$10^{-O D}=\frac{E_0}{M P E}$$
or, equivalently
$$M P E=E_0 10^{-O D}$$
Solving the last expression for $O D$ gives a useful equation for calculating required $O D$ for laser safety eyewear:
$$O D=\log _{10}\left(\frac{E_0}{M P E}\right)$$

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

To ensure safe use of lasers, administrative controls and engineering controls are required. Warning signs and labels, standard operating procedures, personal protective equipment, and laser safety training are examples of administrative controls. Engineering controls are designed into lasers and laser systems to prevent accidental exposure of eyes or skin. Shutters, interlocks, delayed emission, and remote firing are examples of engineering controls incorporated into laser system design.

ANSI Z136.1 states that any facility operating Class 3B and Class 4 lasers must have designated a person to serve as Laser Safety Officer (LSO). The job of the LSO is to ensure that laser safety procedures are in place and followed during

laser operation and maintenance. Courses are available to train LSOs and help them remain current with ANSI standards.

Among the administrative controls required by the ANSI Z136.12014 Safe Use of Lasers standards are warning signs and labels for lasers and for work areas where lasers are in use. The most common sign used for lasers and laser systems is the WARNING sign used for entryways into facilities operating Class $3 \mathrm{~B}$ and Class 4 lasers. The DANGER sign is reserved for situations where serious injury or death will result if control measures are not put in place. Sign dimensions, letter size, font, layout, color, and other design elements must be in accordance with the ANSI Z535, a U.S. standard that provides a system for presenting safety and accident prevention information. (See Figure 1.5.)

## 电子工程代写|光子简介代写光子学介绍代考|计算LSE的光密度

$$E_T=E_0 10^{-O D}$$

$$T=\frac{E_T}{E_0}=10^{-O D}$$

$$10^{-O D}=\frac{E_0}{M P E}$$

$$M P E=E_0 10^{-O D}$$

$$O D=\log _{10}\left(\frac{E_0}{M P E}\right)$$

## 电子工程代写|光子简介代写光子学介绍代考|LASER安全控制

ANSI Z136.1规定任何运行3B类和4类激光器的设施必须指定一个人担任激光安全官(LSO)。LSO的工作是确保激光安全程序到位，并在

## 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。