網(wǎng)絡(luò)工程外文翻譯什么叫光纖與光纖應(yīng)用領(lǐng)域大學(xué)論文

1、中文2430字本科畢業(yè)設(shè)計(jì)（論文）英文翻譯題 目什么叫光纖與光纖應(yīng)用領(lǐng)域?qū)W生姓名 專業(yè)班級(jí) 網(wǎng)絡(luò)工程學(xué) 號(hào)*院 （系）計(jì)算機(jī)與通信工程學(xué)院指導(dǎo)教師（職稱）（講師完成時(shí)間2011年6月6日英文原文What is fiber and fiber optic applicationsUnderstanding the optical fiber, we first take a look at the propagation of light. Just a straight line, but when the light exposure to a substanee occurs when t

2、he refractio n and reflecti on. We ofte n see the glass and mirrors, reflective refers to the reflect ion of light; half of the straight stick into the cup is no Ion ger a straight look is an illusion caused by light refraction. In fact, we have been able to see a variety of objects, that are caused

3、 by refractio n and reflect ion of light (if there is no light, we could not see anythin g.)Propagati on of light in a vacuum can also be spread in certa in substances,certain substancesmentioned here, is called in the optical media or medium terms. Glass, quartz, air, water, clear plastic so the li

4、ght can be transmitted, they are the medium of light transmission. Different medium density is not the same, such as we know the density of water is much larger than the air. Seemingly similar substa nces (such as glass and quartz), and their den sity is not the same. So, is divided into light dense

5、r medium and light sparse media. When the light from one medium will be injected in to ano ther medium refraction, like turni ng the light child friends. Even with the same material, also produced by some of the density of different environmental conditions, such as the air somewhere hot (low densit

6、y), somewhere in the cold air (high den sity), the light pass ing through hot and cold air can also occur when the refraction (We are familiar with the mirage is a result of this situation occurs.) Shine the light on the medium surface is called incident, refracted through the medium of light is cal

7、led refract ion of light. I ncide nt, reflected light and medium in terface (phase two media where) there is a relati on ship betwee n, this is the angle of incidence and refraction. Two points of view angle as the incident light cha nges. Whe nthe light from the optical den ser medium in jected int

8、o the medium an gle light thinning to a certa in exte nt, the light can no Ion ger laun ched into ano ther medium, so will have a total reflect ion of light.Understanding the propagation of light, let us know fiber. Is a simple glass fiber can be, accord ing to differe nt requireme nts, it can be ma

9、de very thi n, usually from a few microns to hun dreds of micro ns. A lot of fiber will usually in crease in the surface (coating) layer of another material, called cladding or coating layer. This layer of material can be used as the medium from the refraction of light thinning, and some flexibility

10、 can enhance the optical fiber so that it can be bent. No fiber coati ng layer is called bare fiber. Bare fiber can also be transmitted optical signal (optical fiber and then the air became two differe nt media.) Depe nding on the n eeds of people in glass or quartz other chemical elements can be ad

11、ded, you can use a variety of complex tech no logy to make thi n fibers with a complex in ternal structure. Therefore, the fiber is a lot of varieties, and some can send thousands of different types of light waves, while others on ly by a sin gle wave of light. Fiber product ion process is relativel

12、y fine, usually called the draw ing. Optical fiber com muni cati ons cable used in the root by the tens to hundreds of such integrated optical fiber, each fiber can take a huge traffic.Therefore, in fiber optical tran smissi on, mai nly the com mon core and the cladd ing effect. Refract ion of light

13、 accordi ng to the above men ti oned reas on, we will understand that the fiber core, and it is certainly outside of the cladding material of two different densities, and the core density should be larger than the packet layer. Thus, as long as a suitable angle of incoming light, this beam of light

14、will be kept in total reflection within the fiber to transmit to the other end.Practical application of optical fiber, as long as not too bent, the light will enter the fiber with in the fiber boun ces back and forth, twists and turns forward propagati on, but also some light into the cladding and i

15、n its dissemination. The propagation of light in fiber will also in spire a certa in wave mode, which related with the thick ness of the fiber, core diameter is too small to determine the transmission mode is difficult to form, the core diameter is too thick to an in crease in tran smissi on mode, t

16、he dispersi on of a serious, solid The fiber core can not be too thick or too thin, gen erally transmitted several times to several times the wavelength. In accordanee with the optical fiber to allow transmission of electromagnetic waves on the mode, can be divided in to sin gle-mode optical fiber a

17、nd multimode fiber. Sin gle-mode fiber that can transmit an electromagnetic wave mode, multimode fiber that can transmit multiple wave modes, in fact, single-mode fiber and multimode optical fiber of the points, that is, the diameter of the core points. Small single-mode fiber, multimode fiber thick

18、. Used in fiber optic cable networks are all single-mode fiber, its transmission characteristics, and bandwidth of up to 10GHZ, can be transmitted in an optical fiber 60 PAL-D TV sets.We have a preliminary understanding of the principles of fiber optic transmission of light, then it is also how a va

19、riety of text, images, sound transmission from? It turned out that the use of electr onic tech no logy, people can be text, images, sound and other in formatio n in to electro nic sig nals, maki ng them all into the 1 and 0 digit stri ng con sist ing of, that is what we ofte n call a digital tech no

20、 logy .In digital tech no logy, the 1 and 0, said circuit for ope ning and clos ing, the use of the optical tech no logy, the bright and dull that they can achieve two states. So, people through Optical (fiber in put to the optical sig nal device) to issue a series of light and dark fiber different

21、light signal, optical fiber receives the other end of the optical signal, then through the specialized equipment to restore it into a digital sig nal, Fin ally, from TV, radio, computers and other digital sig nal will be reduced to text, images, sounds and so on.Optical fiber com muni cati on has a

22、treme ndous adva ntage, first, its capacity is amazing, a thin optical fiber can transmit tens of thousands or even hundreds of millions of road calls, you can transmit thousands of television sets, which is unmatched by other transport means The. Secondthe optical transmission of light sig nals, el

23、ectromag netic in terfere nee from outside it, not afraid of humidity, not afraid of erosion, pollution-free, secure and strong. Optical fiber transmission signal loss is small, only one-tenth of the cable. General coaxial cable, at intervals of 1.5 km is necessary to set up a relay station to compe

24、nsate for signal attenuation; and fiber optic com muni cati ons relay stati on, the dista nce can exceed 10 kilometers. In additi on, the fiber raw material is that we are familiar with the sand (quartz), and more is on the earth and very cheap. Quartz can be produced a few grams a kilometer- long o

25、ptical fiber. Thus in stead of an ordinary metal wire with a fiber can save a lot of valuable non-ferrous metals copper and lead. Very light weight of fiber, 8 fiber made of fiber optic cable, each weighi ng about 60 kg km only, while the same nu mber of ordinarycable is 4 tons.In fact, far more tha

26、 n the fiber optical com muni catio n skills in this area, in many ways, especially in high-tech fields, pienty of fiber not only useless, but new tech no logy is lead ing the revoluti on yet.We know that the light can be transmitted in the fiber which is also known to light a variety of information

27、 with the basic method. In specific applications of such fiber, some only n eed one (such as optical com muni cati on), while others n eed a lot of roots (such as transfer beams). In addition, there is a great application of optical fiber, that is, image transmission. Video image transmission means

28、to direct transmission through the fiber, while the middle is no Ion ger as optical com muni cati on through the conversion process as a signal. Seenin this light, the transmitted light fiber can be divided into two categories, one with a variety of sig nal light, one can see the gen eral image of o

29、ur daily light. Since we can express all kinds of in formati on light, the n the fiber can do things way too much. People use to create a wide variety of fiber optic equipment that we collectively are called optical fiber sensors. Fiber optic sensors can not only transmit information, but also acces

30、sto information. Optical fiber sensors can measure temperature, pressure, vibrati on, content, positi on, rotatio n, deformati on, speed, single ring, voltage, electromagnetic fields, etc., are numerous. Although, like fiber optic transmission of light signals without charge in too many things, but

31、its manufacture has to much trouble. Optical fiber transmission, as is usually the number one million by the tens of thousands to the integration of very fine fiber bundle, called the image bun dles. It is widely used in en doscopic aspects of the health care in dustry as we know it to be.英文翻譯什么叫光纖及

32、光纖應(yīng)用領(lǐng)域在認(rèn)識(shí)光纖之前，我們先來了解一下光的傳播。光是直線傳播的，但當(dāng)光線 照射到某一物質(zhì)上時(shí)便會(huì)發(fā)生折射和反射。 我們常會(huì)見到玻璃和鏡子“反光”就 是指光的反射；一半插入水杯中的直棍看起來不再是直的是光的折射造成的假 象。其實(shí)，我們之所以能夠看到各種物體，那都是光的折射和反射造成的（如果 沒有光，我們什么也看不到）。光可以在真空中傳播，也可以在某些物質(zhì)中傳播， 這里所說的某些物質(zhì)，在光學(xué)的術(shù)語中叫做介質(zhì)或媒質(zhì)。 玻璃、石英、空氣、水、 透明塑料等等都可以傳播光線，它們都是傳播光的介質(zhì)。不同的介質(zhì)密度是不一 樣的，比如我們知道，水的密度要比空氣大很多。表面上看起來差不多的物質(zhì)（如 玻璃和石

33、英），它們的密度也是不一樣的。因此，又分“光密介質(zhì)”和“光疏介質(zhì)” 0當(dāng)光線從一種介質(zhì)射入另一種介質(zhì)時(shí)就會(huì)發(fā)生折射，好像是光線拐彎兒啦。即使是同一物質(zhì)，也會(huì)因某些環(huán)境條件而產(chǎn)生密度不同，如某處的空氣熱（密度 低），某處的空氣冷（密度高），光線在穿越冷熱空氣時(shí)也會(huì)發(fā)生折射（我們熟知 的海市蜃樓就是因這種情況而發(fā)生的）。照到介質(zhì)表面上的光叫入射光，經(jīng)過介 質(zhì)折射的光叫折射光。入射光、折射光和介質(zhì)的界面（兩種介質(zhì)相接的地方）之 間存在著一種相互關(guān)系，這就是入射角和折射角。兩個(gè)角度隨著入射光線角度的 變化而變化。當(dāng)光線從光密介質(zhì)射入光疏介質(zhì)的角度變化到一定程度時(shí)，光就不能再射入另一個(gè)介質(zhì)中了，于是就會(huì)

34、產(chǎn)生光的全反射現(xiàn)象。了解了光的傳播，我們再來認(rèn)識(shí)光纖。簡單的光纖可以就是一根玻璃絲， 根 據(jù)不同要求，它可以做得非常細(xì)，一般從幾微米到幾百微米。通常很多光纖都會(huì) 在表面加（涂）上一層別的物質(zhì)，叫包層或涂敷層。這一層物質(zhì)可以作為光疏媒 質(zhì)起折射作用，有的還可以增強(qiáng)光纖的柔軟性使其可以隨意彎曲。 沒有涂敷層的 光纖就叫裸纖。裸纖也可以傳播光信號(hào)（這時(shí)光纖和空氣就成了兩種不的介質(zhì)）。 根據(jù)不同需要，人們在玻璃或石英中可以加入其他化學(xué)元素， 可以利用多種復(fù)雜 工藝使細(xì)細(xì)光纖的內(nèi)部具有復(fù)雜的結(jié)構(gòu)。 因此，光纖的品種也是很多的，有的可 以同時(shí)傳送上千種不同波型的光波， 有的則只能通過單一波型的光線。 光纖

35、的制 作過程比較精細(xì)，通常叫做拉絲。光纖通信中用到的光纜是由數(shù)十到數(shù)百根這樣 的光纖集成的，其中每根光纖都可承擔(dān)起巨大的通訊量。光所以能在光纖中傳輸，主要是纖芯和包層的共同作用。根據(jù)上面講到的光 折射道理，我們就會(huì)明白，光纖的纖芯和它外面的包層肯定是兩種密度不同的物 質(zhì)，而且纖芯的密度應(yīng)該大于包層。這樣，只要一個(gè)光線射入的角度合適，那么 這束光線就會(huì)在光纖內(nèi)部不停地進(jìn)行全反射而傳向另一端。實(shí)際應(yīng)用中的光纖，只要不是過分彎曲，進(jìn)入光纖的光都會(huì)在光纖內(nèi)來回反 射，曲折向前傳播，但也會(huì)有部分光滲入到包層并在其內(nèi)傳播。 光在光纖中傳播 時(shí)也會(huì)激發(fā)出一定的電磁波模式，這種模式同光纖的粗細(xì)有關(guān)，芯徑太細(xì)難以形成確定的傳輸模式，芯徑太粗則使傳輸模式增多，使色散嚴(yán)重，固而光纖的纖 芯不能太粗也不能太細(xì)，一般為傳輸波長的幾倍至幾十倍。按照光纖中容許傳輸 的電磁波模式的不同，可以把光纖分為單模光纖和多模光纖。 單模光纖指只能傳 輸一種電磁波模式，多模光纖指可以傳輸多個(gè)電磁波模式， 實(shí)際上單模光纖和多