专业英语演讲稿(stealth material)

stealth material introduction Chapter1：Good afternoon everyone! Today, I will give you a presentation about the stealth material. Chapter2：Firstly, Lets look at a group of pictures. It is a piece of invisibility cloak, which we can wear it from being seen by others. Maybe everyone of us all want to have a trying of the amazing thing. Chapter3：looking at the pictures, how wonderful they are! This is the stealth material that I want to introduce to you today. Chapter4：What is stealth material? Now, Lets look at the definition of stealth material. Stealth material is a special-purpose materials to reduce the weapons and equipment of radar, infrared and visible light or sound waves to detect signal characteristics, make it difficult to detect, identify, track, or attack .(降低武器装备的雷达、红外、可见光或声波等可探 测信号特征、使之难以被探测、识别、跟踪或攻击的一种特殊用途 材料。) Chapter5：Usually stealth material has the following requirements: firstly, Stealth material is the material foundation to realize stealth technology. Then, Weapon system using stealth materials can reduce the detection rate, improve their survival rate, increased aggression, the most direct military benefit. Lastly, As a result, it on the plane, the main battle tanks, ships, arrow plays on application, will become an important part of national defense high technology. (隐身材料是实现隐身技术的物质基 础。武器系统采用隐身材料可以降低被探测率，提高自身的生存率， 增加攻击性，获得最直接的军事效益。因此，它在飞机、主战坦克、 舰船、箭弹上应用，将成为国防高技术的重要组成部分。) Chapter6：Next, this is the classification of stealth material. According to the application of stealth material can be divided into Stealth coating material(隐身涂层材料) and Stealth structure materials(隐身结构材料) 。Also ，it Can be classified as Laser stealth（激光隐身）、sound（声） 、radar（雷达）、infrared（红外）、Visible light（可见光） According to the spectrum（频谱） of stealth material。 Chapter7：Today, we focus on Several principles of stealth material. First of all, we learn about radar absorbing materials.The working principle of the radar can classified as Reflection, transmission and absorption .Refle- Cting is that Radar using the reflection wave to detect the object (雷达利 用波的反射来探测物体).but, How to make waves do not return back? - -absorbed the incident wave (把入射的波吸收掉). Chapter8：Then,Its stealth features require him able to absorb or through the radar wave, decrease as far as possible to detect the reflected wave. The radar stealth material is given priority to with absorbing material. 第 3 页 共 7 页 According to the application of stealth material can be divided into Stealth coating material(隐身涂层材料) and Stealth structure materials(隐身结构材料 )。 Chapter9：Lets introduce the Coating absorbing materials，firstly, Type coating absorbing material is on the target surface coated with a layer or multilayer absorbing material, so no special requirements to its host. Secondly, Convenient to use this material in military aircraft, tanks, ships have a wide range of applications.thirdly, composition: the base material, absorbing agent (key) and some other additives. Finally, According to the chemical composition can be divided into inorganic absorbent absorbing agent (ferrite, metal and ceramics), organic polymer absorbing agent (conductive polymer and retinyl schiff base), chiral absorbing agent and intelligent absorbing agent. 涂敷型吸波材料是在目标表面涂覆了一层或多层吸波材料，因此对它的承载性没有特殊要 求。 这种材料使用起来方便快捷，在军用飞机、坦克、军舰上都有很广泛的应用。 组成：基体材料、吸波剂（最关键）以及其它一些助剂组成。 按照吸波剂的化学成分可分为无机吸波剂（铁氧体、金属以及陶瓷），有机高分子吸波剂 （导电高聚物和视黄基席夫碱），手性吸波剂和智能吸波剂。 Chapter10：Another type of stealth material is Structural absorbing materials(结构型吸波材料 ) .Firstly, A kind of multi-functional composite material, have the double function of bearing and radar stealth. Secondly ,Because of the need to carry, so demand for this kind of material is very high. Thirdly ,composition:base material (bearing) and absorbing agent compound. Some material (mainly polymer substrate material) .finally ,Practical application: rockwell international use graphite/epoxy composites and skin made of glass cloth, graphite, carbon black, rubber absorption layer and honeycomb structure made of F - 117 aircraft, cover and inlet port of a complete set of labial ministry, etc. 一种多功能复合材料，具有承载和雷达隐身的双重功能。 由于需要承载，因此对这种材料的要求非常高。 组成：基体材料（承载）和吸波剂复合。基体材料主要是高分子类的一些材料 实际应用：洛克威尔国际公司用石墨环氧复合材料和由玻璃布蒙皮、石墨、炭黑、橡胶 等组成的吸收层和蜂窝结构制造了 F-117 飞机的整套罩和进气口唇部等。 Chapter11：Infrared stealth materials(红外隐身材料),The Working principle of Infrared stealth materials is Using the target from the infrared to find, identify and track the target.Usually background temperature is low, less radiation energy. 利用目标发出的红外线来发现、识别和跟踪目标。 通常背景的温度较低，辐射能量较小 Chapter12：Now, we learn about Laser stealth material. In infrared wave, especially in the near infrared wave has strong absorption ability or shielding effect, make the difference of target and environment. By reducing the targets emissivity and temperature to achieve infrared stealth. 隐身要求：对红外波,特别是近红外波有强吸收能力或屏蔽作用,使目标与环境的 差别小。通过降低目标的发射率或温度来达到红外隐身目的。 The working principle of the radar can classified as Chapter13：Laser stealth material. (激光隐身材料)Laser can also be used as radar, is often eferred to as lidar. Compared with conventional 第 5 页 共 7 页 microwave radar, has higher resolution, anti-interference ability, and concealment. Laser stealth process is similar with the process of radar stealth, main is to reduce reflection coefficient on the surface of the target, reduce the echo power of the laser detector. Absorb dye laser, including cyanine dye, titanium cyanine dyes, metal complex dyes, free radical dyes, aromatic methane dye, etc. In addition, also can be used on engineering transmission material, light material, photochromic material, variable polarization, etc. 激光也可作为雷达使用，常被称为激光雷达。与普通微波雷达相比，具有更高的分辨力、 抗干扰能力和隐蔽性。 激光隐身过程与雷达隐身过程相类似，主要是降低目标表面的反射系数，减小激光探测器 的回波功率。 激光吸收染料，包括菁类染料、钛菁类染料、金属络合物染料、游离基型染料、芳甲烷型 染料等。 此外，工程上还可采用透射材料、导光材料、光致变色材料、变偏振材料等。 Chapter14：The application