中英論文翻譯對照塑料光纖傳光原理通信-文庫吧在線文庫
【正文】 光纖具有芯皮結(jié)構(gòu)，光在POF中傳輸是按全反射原理進(jìn)行傳光的，光在SI POF中的傳輸方式為全反射式鋸齒型，光在GI POF中的傳輸方式為正弦曲線型；同時(shí)為了簡化計(jì)算，選用子午線進(jìn)行了參數(shù)計(jì)算，子午線就是光線的傳播路徑始終經(jīng)過光纖軸并在同一平面內(nèi)，這些參數(shù)計(jì)算包括最大入射角或發(fā)射光角度、數(shù)值孔徑、子午線在階躍型光纖中的幾何行程及反射次數(shù)；側(cè)面發(fā)光POF和熒光POF也是按全反射原理進(jìn)行傳光的，對于單芯側(cè)面發(fā)光POF多是由非固有損耗導(dǎo)致側(cè)面發(fā)光，而對于多芯側(cè)面發(fā)光POF則是由彎曲損耗產(chǎn)生側(cè)面發(fā)光的。在空氣中，由于n≈1，光波的傳播速度接近于真空中的傳播速度C；,108m/s。也就是說光既具有粒子性，又具有波動(dòng)性，光在傳播時(shí)表現(xiàn)為波動(dòng)性，而與物質(zhì)作用時(shí)又表現(xiàn)為粒子性。丁達(dá)爾向英國皇家學(xué)會(huì)演示了一個(gè)著名的實(shí)驗(yàn)，他當(dāng)時(shí)用一只盛滿水的器皿，讓水從器皿的側(cè)孔中流出，這時(shí)投射在水中的光也隨著水流傳導(dǎo)出來。1880年，威廉通常我們所說的光是電磁波的一種，它通常由紫外光、可見光和近紅外光組成，其中1390nm 波段的光為紫外光UV，波長為280300nm波段為UVB，它的強(qiáng)光可以殺死或嚴(yán)重?fù)p傷地球上的生物。光在均勻媒質(zhì)或不均勻媒質(zhì)中傳輸時(shí)，滿足費(fèi)瑪(Fermat) 原理，即光從空間一點(diǎn)到另一點(diǎn)是沿著時(shí)間為極值的路程而傳播的，即光沿著光程為最小或最大或恒量的路徑傳播。熒光POF經(jīng)過特定波長光激發(fā)后發(fā)出特定波長的光，而且激發(fā)光不僅可從端面入射，而且可從側(cè)面入射。 wavelength of 7601500nm for the nearinfrared light, the infrared wavelength range of , far infrared spectrum wavelength range 25300μm, more than farinfrared optical frequency or wavelength smaller longer a millimeter wave, microwave, short wave, medium wave and long wave and so on. The visible light is again posed of seven colors, that contain visible red light, orange light, yellow light, green light, blue light and shade of indigo light, etc. International Commission on Illumination uniform standard is required: select a wavelength of 700nm mercury spectrum in the red for the redbased color light, green light of a wavelength of base for the green shade, the blue wavelength of blue base shade. Conventional POF usually ultraviolet light is not very good, while quartz fiber and a special liquidcore optical fiber in the region has a good transmittance, POF in the visible region have very good light transmission rate, from POF core material selection and deuterium fluoride polymer material prepared POF in the near infrared region have a very good light transmission. Propagation of light in vacuum is the fastest speed, transmission medium, its refractive index is different from the speed of light transmission is also different. In contrast, a large refractive index of light transmission medium is denser medium, the refractive index of the transmission medium is a little sparse optical media, in terms of the POF, POF core material for the optical denser medium, POF material for light skin thinning medium, the light optical density media in the core material will reduce the propagation velocity, so the light transmission in the core material in the skin material slower
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