The physics behind fiber optics 51 the physics behind fiber optics a. Optical fiber communication has brought us a new in ternet society. An experimental study on the design, performance and. In addition, todays data center is largely depend on electronic equipment and fiber optic. Fiber optics explained fiber glossary all the terms in use. Data center cooling methods posted on may 20, 2016 by admin in recent years, as the number of agencies load up on big data and move to the cloud accelerating. Cooling tower types cooling towers fall into two main categories.
Request pdf evaluation of the performance of local fibers in evaporative cooling. Basics of fiber optics mark curranbrian shirk fiber optics, which is the science of light transmission through very fine glass or plastic fibers, continues to be used in more and more applications due to its inherent advantages over copper conductors. Data center cooling methods fiber optic componentsfiber. Fiber optic cable thermal preparation to ensure stable operation william j. An evaporative cooler is a device that cools air through the evaporation of water. Experimental performance analysis of a solar evaporative. Plant propagation pls 32215222 university of florida. Condair glass fiber evaporative cooling and humidification. An experimental study on the design, performance and suitability of. Three types of cooling pad made of a cellulose, aspen fiber, and coconut coir were comparatively studied. Pdf performance evaluation of three different types of local. To investigate this matter, we monitored the change in outer coating diameter od as a response to heat. Thermoelectric cooling has quickly become a practical proposition for many types of electronic equipment. The method is based on backscatter of light traveling through a fiber.
Fiber optic cable thermal preparation to ensure stable. Data center cooling methods posted on may 20, 2016 by admin in recent years, as the number of agencies load up on big data and move to the cloud accelerating dramatically, more data centers will come online, and cooling may become one of the biggest problems to overcome. Possible meltdown of the fiber at higher optical powers. The water exits the cooling tower and is sent back to the exchangers or to other units for further cooling. Peltier modules for thermoelectric cooling digikey. Aramid yarn a protective woven strength member, usually made of kevlar. Posted by blog on cooling most sonoran desert dwellers have migrated their home cooling mode to central heating and air conditioning units, but a few still hang on to their swamp cooler or else use a combination of air conditioning and swamp. Skin effect of fresh water measured using distributed. Optical fiber optical fiber or fiber optic refers to the medium and the technology associated with the.
Performance evaluation of alternative evaporative cooling. This study is performed in summer and based on weather conditionof bhopal, india. To gain an understanding of the mechanics for the fiber based absorbent evaporative cooling, an indepth study that results in the mathematical modeling of the heat and mass transfer that takes place during cooling for both singlescaffold structure and multiscaffold structure was built. Miaoulis, axial heat conduction effect in the cooling of optical. Impact on fiber geometry heat aging can also lead to changes in fiber geometry. In one embodiment, an optical fiber cooling system includes a first cooling tube oriented substantially in parallel with and spaced apart from a second cooling tube such that an optical. A brief history of fiberoptic communications the physics. The basic law of light guidance is snells law figure 5. In order to specify the characteristics of optical fibres and systems operating with optical amplifiers and the wdm technique, many new recommendations were developed in itut.
To evaluate performance of three types of evaporative cooling pads for greenhouses celdek pads, straw pads and. The theory of optical fibres these few pages will explain the concepts behind optical fibres and how they work. The stress aligns the fiber, and the light, to a particular polarization. Simulation of single mode fiber optics and optical. Ultrabroadband photonic structures to achieve high. Edfas allow information to be transmitted over longer distances without the need for conventional. Contaminants wont stop at cooling system, they will capture every possible place where they can get to. Fiber optics fundamentals711 applied network research group department of computer engineering, kasetsart university 711 light source led injection laser diode power. Three kinds of pads are used in the cooler including a conventional pad. Passive optical components and their applications to ftth. If a simple optical ray diagram is drawn from the center of each unit to all parts of the. Generally, thecollection optics is a rod or flexible fiber of sapphire directed at the hotobject.
For the first time, we present a metaldielectric photonic. Introduction to fiber optic sensors 9 intereferometers. Brief history and overview of optical fiber technology in. Optical fiber technology in telecommunications author. Experimental performance analysis of a solar evaporative cooler. An optical fiber is a flexible, transparent fiber made by drawing glass or plastic to a diameter slightly thicker than that of a human hair. The purpose of this article is to provide the nontechnical reader with an overview of. It is the purpose of this manual to provide engineering and application data to. This, combined with excellent corrosion resistance, and the fibers ability to be soldered or brazed, makes it the ideal fiber for many high temperature applications such as turbine flame. The present study aimed to evaluate the feasibility of coconut coir pads, jute fiber pads and sackcloth pads as alternative pad materials.
Glass fiber evaporative effectiveness type block depth 4 101. More difficult and more expensive connections than those for copper ones. While were obviously partial to using fiberoptics to provide detroit with gigabit speed internet, some of these other technologies are pretty cool. Design of new evaporative cooler and usage of different. Ware houses or garages, and it may also be used outofdoors on portico or on work sites. Optical and evaporative cooling of cesium atoms in the gravitooptical surface trap article pdf available in journal of modern optics 4714 november 2000 with 49 reads how we. Fiber types multimode fiber multimode fiber is so named by its large core. Introduction to fiber optics what are optical fibers thin strands of pure glass carry data over long distances at very high speeds fiber can be bent or twisted fiber optic technology sources.
There are mainly two basic types of evaporative cooling systems are present namely direct and indirect evaporative cooling systems1. Powerpoint types of optical fiber linkedin slideshare. Temperature measurement using optical fibers electronics. There are two basic types of evaporative air coolers eacs. Typical closed loop cooling tower system is shown in figure 7. A fiber optic cable, even one that contains many fibers, is usually much smaller and lighter in weight than a wire or coaxial cable with similar information. Devices on the market today are compact, efficient and with the benefit of. We have arranged them in order but feel free to navigate around as you like.
Closed circuit cooling towers provide evaporative cooling for many types of. In this paper different cooling pads have been studied. Physics optics and optical physics physical chemistry plasma physics. Preventive maintenance of fiber optic cables and optics the end of a fiber optic cable and the inner surface of an optical module lens constitute optical surfaces that should be. These interferometric sensors have wide applications in science, engineering and technical field 4,24,35. If properly designed, terrestrial structures can passively cool themselves through radiative emission of heat to outer space. Traditionally, evaporative cooler pads consist of excelsior aspen wood fiber inside a. Basics of fiber optics mark curranbrian shirk fiber optics, which is the science of light transmission through very fine glass or plastic fibers, continues to be used in more and more. Installation of an inline water filter refrigerator drinking waterice maker type will. With means for cooling newly formed fiber, filament, or. The same type of optical cable was used for all three measurement locations. Jute fiber is one of the useful natural fibers used for evaporative cooling to reduce. The types are named for the shape of the stress rods. Types of optical fiber understanding the characteristics of different fiber types aides in understanding the applications for which they.
This article presents the operation of a simple dcpowered solar evaporative cooler which was designed in the university of tehran. Absorption signal loss created by light energy turning into heat. To date, various types of fiber optic temper ature sensors have been reported in the literatures and they are mostly based on fibe r interferometric choi et al. Avelar abstract this document will guide you through the historical development of fiber optics and the advances in recent. Portable coolers cool small places or rooms, generally up to 300 square feet. Pdf optical and evaporative cooling of cesium atoms in. The lightpipe is placed so as to create increased emissivity, such as asmall hole through a holder or. Humidification and evaporative cooling systems, condair offers standalone evaporative media pads ideal for retrofit or replacement.
Evaluation of the performance of local fibers in evaporative cooling. Preventive maintenance of fiber optic cables and optics. Thus, the fiber cooling necessitates a dedicated cooling unit between draw furnace and coating applicator and there exist several computational research efforts on analyzing fiber cooling. Optical fibre, cables and systems i foreword malcolm johnson director itu telecommunication. Pdf this study was conducted in date palm technology company limited, shambat, khartoum state.
1097 1267 1332 935 1344 322 1104 700 954 320 331 430 129 1126 1453 394 670 846 718 407 251 1297 182 54 492 1092 100 1342 1020 654 324 100