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1、Specific English for Electronic Information Engineering,Teacher：张培珍,Guangdong Ocean University,Lesson 14: Microwave oven,Index Pre-reading 14.1 History of microwave oven 14.2 The working theory of microwave oven 14.3 Microwave radiation,Pre-reading,1,2,3,History of microwave oven.,Working theory of
2、microwave oven;,Microwave radiation,Read the lesson, paying attention to the following questions.,Remind the Words and expressions,Microwave Oven Magnetron Commercial Manufacturing Standard Fixture Theory chamber,Wavelength Household Molecule Absorb Dielectric Fat Frozen Commonly Property,Remind the
3、 Words and expressions,Plastic Glass Ceramics Faraday Mesh Radiation,Virtually Shield Texture Conventional Appearance Efficiently,Microwave,Microwaves are a form of electromagnetic radiation with wavelengths ranging from as long as one meter to as short as one millimeter; with frequencies between 30
4、0 MHz (100 cm) and 300 GHz (0.1 cm),The electromagnetic spectrum,Atomic nucleus,Atom,The electromagnetic spectrum,History of microwave oven,Microwave was discovered by Percy Spencer; 1946，Raytheon patented the microwave; The first commercial microwave, the radarange is built in 1947.,History of micr
5、owave oven,Litton developed a unique configuration of microwave, the short, wide shape is now common; Microwave were increasingly becoming a standard fixture of most kicthen;,爆米花和热团加热器,微波炉最早的名称”爆米花和热团加热器” 1946年有关雷达的研究项目中，Percy Spencer博士，一位雷神（Raytheon）公司的自学成才的工程师在测试一种被称作磁控真空管时，他发现自己口袋里的糖块融化了。这引起了斯宾塞博
6、士的兴趣，于是他做了另一个试验。这一次，他把一些爆米花粒放到真空管旁边，看着爆米花噼里啪啦地四散飞溅到整个实验室，创新的火花也闪烁而出。 第二天上午，科学家斯宾塞把磁控管拿到一个鸡蛋旁。鸡蛋内快速升高的温度产生了巨大的内部压力。鸡蛋突然炸开，在他那惊奇的脸上溅满了热腾腾的蛋黄。 1946年雷神公司为利用微波烹饪食物申请了一项专利。 微波炉逐渐走入了千家万户。由于用微波烹饪食物又快又方便，不仅味美，而且有特色，因此有人诙谐地称之为“妇女的解放者”。,“Radarange”初登场,1947年，雷神公司推出了世界上第一台微波炉，并将其命名为“Radarange”，这个名字是从一个员工的（命名）比赛中
7、脱颖而出的。第一台微波炉被装在一个冰箱大小的橱柜里，价格约2000美元到3000美元。,Words and expressions,Microwave Magnetron Radar set Patented Commercial Asset Manufacture Similar to Unique Configuration fixture,微波 磁电管 雷达设备 授予专利，获得专利 商业的 资产，优点 制造 相似的 独特的 结构，配置，外形 固定设备,14.2 Working theory of microwave oven,Microwave oven consists of a ma
8、gnetron, control circuit, wave guide and a cooking chamber; Microwave radiation is at 2450MHz, wavelength is 12.24cm;,Words and expressions,Consist of Magnetron Control circuit Wave guide Chamber Radiation Wavelength,构成，包括 磁电管 控制电路 波导 室 辐射，放射线 波长,The working theory,Magnetron converts household elect
9、rical current into microwave energy; Microwave are attracted to water, sugar, and fat molecules; Absorbs energy from microwave beam called dielectric heating; Most molecules are electric dipoles;,The working theory,Molecular movement creates heat; Microwaves cause the molecules to vibrate billions o
10、f times per second; (3)Microwave heating is most efficient on liquid water, and much less so on fats, sugars and frozen water;,Frequency of microwave oven,The commonly used radio wave frequency is 2450MHz; Microwave are absorbed by water, fats and sugars, but are not absorbed by plastics, glass or c
11、eramics; Metal reflects microwave;,Words and expressions,Radio wave Property Absorbed Fat Sugar Plastic Ceramic reflect,无线电波 特征 被吸收 脂肪 糖 塑料制品 陶瓷制品 反射,Cooking chamber,The cooking chamber is a faraday cage enclosure to prevent microwaves escaping into the surroundings;,The oven door,The oven door is a
12、 glass panel, has a layer of conductive mesh to maintain the shielding; The mesh width is much less than the wavelength of 12cm, the microwave radiation can not pass through the door;,Words and expressions,Cooking chamber Faraday cage Enclosure Escaping Surrounding Panel Layer Conductive Mesh Shield
13、 visible,烹饪室 法拉第笼 围绕 泄露，逃跑 环境 平板 层 导体 网格 防护，护罩 可见的,14.3 The microwave radiation,There is a misconception that microwave leak radiation; Its virtually impossible to be in contact with microwaves emitted from a microwave oven; Because the wave is wider than the mesh covering on the doors, the shield i
14、s made of metal, which blocks the wave going through the door;,Words and expressions,Misconception Leak Radiation Virtually In contact with Emit Pattern Mesh Shield Block plastic,误解 泄露 辐射 实质上，事实上 与。有关 发射 图案，模式 网格 防护罩 阻止，阻碍 塑料制品,Application,The microwaves are becoming more and more popular; Food is c
15、ooked in a microwave is more efficient and quickly; Food can retain more of fresh-picked flavor, appearance, and texture;,Words and expressions,Popular Efficiently Conventional Vegetable Retain Fresh-picked flavor Appearance Texture Traditional,受欢迎的，流行的 有效的 传统的 蔬菜 保持 新鲜口味 外表，外观 肌理，质地 传统的,Thank You!,广东海洋大学,www.51 搜集整理,
