Applications Of Laser In Engineering English Language Essay

Applications Of optical maser In Engineering English Language EssayIntroduction opthalmic maser has umteen applications in different fields especially in engineering. It is one of the most weighty inventions in the last century. laser is utilize wide in the engineering field providing facilities while applying many engineering processes. Its applications likewise helped in the development of engineering.. Laser is an important instrument in engineering that has been intentd astray by engineers in many aspects for its wide purpose and usefulness laser is a solution looking for a fuss. This report aims to analyze the applications of laser and argue the effect of laser on the mathematical product produced by this applications. This report gives detailed discipline about different engineering applications of laser.History of LaserThe first conceit of using rays of come to help in exiting and changing the appearance of atoms discovered by Albert Einstein in 1917. He said tha t it would be possible to show an atom release bring out down or guard any unusual actions using rays by definite frequence. But he was not the one who invented laser itself he just opened the way to other scientists to extend on it. Schawlow and Townes ar the 2 persons who first applied the idea of laser but they failed in their first experiment. In 1960 they succeeded to generate the first laser channel using a type of ruby.What Does LASER means?LASER stands for Light Amplification by the Stimulated Emission of Radiation Laser is a wind that emits electromagnetic waves in the form of a special type of light. It spreads as narrow crystal clear beams that jackpot be turned into one using lenses. Laser has many uses in different fields so that people needed that effective invention.Laser simply consists of a narrow light beam that is produced by a process called Stimulation of atoms. This process is held by using an amplified light beam of proper(postnominal) frequency a nd intensity. That light beam is used to stimulate the atom. Stimulation of the atom means that we give it an extra amount of energy that makes in excited. That excitation makes the outmost most electrons move to a melloweder level. Then they need to get rid of this extra energy to be back to its original and normal state, so it emits that extra energy in the form of a light beam. That light beam is laser. Thats how laser is produced.Laser solved many problems that faced engineers before inventing it. It facilitates many processes and performances for engineers. It similarly helps them find slightly information they need. As an example before inventing laser cutting and welding operations were very difficult. It was a problem to cut a metal, as you had to heating system it up to a very postgraduate temperature then you modify its shape. Laser solved this problem and made that operation become very easy and fast. As another example before inventing laser there were no wireless connections or laser radars. Laser similarly made the communication processes very fast and widely used. It made solutions for many problems that irritated engineers and people.Laser opened many screwledge and technology ways that would be impossible without it. After inventing Laser it became impossible to imagine our life without it. It became the key of many engineering operations that it will not be carried out without laser. true statement is one of its most important advantages that remove any doubts around it.It is expected that laser will be developed more and more in the future day to provide engineers by other facilities. It lowlife also be a reason for inventing other technologies. Again, Laser can be our gate to other inventions that could make our life easier and more comfortable.Laser Beam WeldingLaser Beam Welding LBW is a contemporary welding technique used to join two-fold pieces of metal using a laser. The beam provides a concentrated heat input, allowing fo r narrow, deep welds at high rates. This process is frequently used in many applications and develops to new industries.Laser beam welding has been extensively used in the automotive, aerospace, electronic, and heavy manufacturing industries to join a variety of materials. In the automotive industry, high-power lasers be used to weld many components such as contagions, mufflers, catalytic converters, exhaust systems, and tailor-welded blanks.(Wikkipedia.com)Because of Laser welding advantages such as deep welding and reduced heat inputs. Profound Manufacturers sought to automate the welding process caused the expansion of the laser beam welding process to include computers sophisticated technology to increase the product quality and more accurate control of the welding process.From More than 20 years ago, when laser welding was in its early stages it was used primarily for droll applications where no other welding process would be suitable. Nowadays, laser welding is an imperative part of the metal toil industry.Laser beam welding has high power density (on the order of 1Megawatt/cm(MW)) resulting in small heat-affected zones and high heating and cooling ratesHow it move aroundsThe Focal point is aimed on the work piece surface that weld is needed. At the surface of the work piece, the enormous concentration of light energy transformed into thermal energy. The surface of the work piece starts melting and steps forward through it by surface conductance. For welding process, the beam energy been maintained below the vaporization temperature of the material. In Fig. 1 the laser beam is directed on the work piece. attend 11 laser beam aimed on the work pieceImage dexterity of NorteastLaser.comTo the point that the laser beam strikings the work piece, all the components that direct it be transp arent, refractive or reflective, absorbing only small amounts of energy from the ultraviolet light (www.accu split.com). When the pulse of laser energy is focused into a small spot at the surface of the work piece, the energy density becomes enormous. The light is engrossed by the work piece, causing a keyhole effect as the focused beam drills into, vaporizes and melts some of the metal (www.accuparts.com).. As described in fig. 2.Figure 12 laser beam welding processImage courtesy of NorteastLaser.comIn fig. 3 as the pulse ends, the liquefied metal around the keyhole flows back in, bent and creating a small spot weld, moving the work piece or the laser emitter a recollective the surface of the work piece creates a series or spot-weld called a seam.Figure 13 the keyhole effect by laser beamImage courtesy of NorteastLaser.comEquipmentThe two types of lasers commonly used in are solid-state lasers and gas lasers (especially one C dioxide lasers and NdYAG lasers).The first type uses one of several solid media, including synthetic ruby and chromium in aluminum oxide, neodymium in ice (Ndglass), and the most common type, crystal composed of yttrium aluminum garnet doped with neodymium (NdYAG).Gas lasers use mixtures of gases like helium, nitrogen, and carbon dioxide (CO2 laser) as a medium. (wikkipedia.com)Advantages of applying Laser WeldingOne of the major advantages that laser welding is the low amount of heat that is used during the welding process. The process repeats the laser beam to allow for the cooling of the spot weld, resulting in a very small heat affected zone, which makes the welding process use less energy, and makes laser-welding exaltation for thin sections or products that require welding near electronics faultless.In conclusion, I would say that laser beam welding process when united with robotics and computer-controlled beam movements or work piece movements make laser welding systems offer a supreme flexibility to perform a variety of operations.3D laser see3D Laser Scanning is a type of reverse engineering. Reverse engineering helps in knowing more information about any object, software, wile or a sys tem. It mainly works by analyzing any part of that object and taking it apart to know everything about it using laser. It returns that object to its origins and know how to make a copy of it without destroying the main object or modifying it. That type of engineering can be used in many fields and it can be applied on anything as it is a high quality technology. That technology depends mainly on laser and its various types. Reverse engineering analyzes objects to see to it how it works or how it has been done. It also can be used to know the dimensions of a put in or an object. It is mostly used on objects that it documentations are lost.3D Laser Scanning is used to prize the dimensions of a place or a part of a place by converting physical objects or parts into data to be read on a CAD program. That measurement is done by a coordinate standard machine that estimates accurately what are the dimensions of that part. After measuring the CAD program draws 3D ciphers of that part. That method helps in knowing the dimensions of the object accurately without errors or assumptions. The 3D images produced by that method are called virtual reality. Those accurate 3D images need a very large amount of data as it measures fine details of the object.Figure 24 3D image drawn using 3D laser scanningThe amazing thing about 3D laser scanning is that it is supposed to point a long time to measure the fine details of an object accurately then reverse it into data that can be read by CAD programs. But actually that process takes seconds. It saves a lot of time which the person can spend to draw that object or try to measure its dimensions by any traditional method. That shows how laser helped in saving untold time for engineers. Laser captures every single detail in the object in a tremendously fast and accurate way. It is impossible for human to puree that level of accuracy even if he spends hours or days trying to reach it.3D laser scanning is applied in 3D scanners, coordinate measuring machines and 3D digitizers. As we said it is the fastest and most accurate measuring method that can analyze objects to know how it works or to know its dimensions. Also it saves effort and money. This application is such an amazing application of laser in engineering fields. People call it hard work that looks like magic.Communication systemsA communication system is designed to transmit and receive information using light beams like fibers. Laser works as a light beams which has enormous potential for data transmission with very high data rates. Laser communications systems are wireless connections throughout the atmosphere.Before using laser in communication, the Greeks used fire and smoke to transmit information, by the evolution of the technology, opthalmic fibers and radio waves are used for the communication of information over distance. Nowadays, lasers are used in optic fibers communications, fibers optics is a medium for carrying information from one p lace to another in the form of light. Unlike the copper transmission lines, fiber optics is not electrical in nature. Communication systems are based on optical fiber because of its advantage over metallic transmission lines. Fiber optics is used increasingly in data and telecommunications. Optical data transmission is increasingly used in various areas, such as telephone, internet traffic, cable TV. In Japan, many internet connections are already delivered to home with optical fibers.How does laser work in communication system?Figure 35 laser communication processAdvantage of laser in communication systemLasers form some special characteristic such as good directivity, polarization, monochromatic, coherent.The approach of optical fiber communications has advantages compared with systems based on electrical cables, the most important areThe losses for light propagation in fibers are very small because there is no fraction.The capacity of fibers for data transmission is huge and its also fast in the storage of data.Compared with electrical cables, fiber optic cables are very light weight, so the cost is very low.Due to the huge transmission rate of data, the cost compared by the rate of transmission is low.In fibers optic cables, the problems that arise with electrical cables such as ground loops or electromagnetic contraceptive device are eliminated.Figure 36There are several significant advantages for communication system that operate with fiber optics than systems which use radio frequencyLaser communication provides much higher data transmission rate compared to radio frequency.Small dimension light weight of components.Lower power.Application of laser in space communicationLasers used in free space laser communication systems, its one of the most important application of laser in communication either semi-conductor laser diodes, solid state lasers and fibers amplifiers lasers.Free space optical communication is the transmission of data over long distanc e, e.g. surrounded byPlanets. populace and satellites.Spacecraft and Earth based station.Figure 37 laser communication between satellitesFigure 38There are some advantages of the use of laser in space optical communication such as high power, large rate of data transmission, small size and light weight, but one of the main disadvantage of using laser as a link in space communication is the interconnection only between points that nonplus direct line of sight. The application of laser communication is discussed for a global communication system and an inter-satellites link, because laser can be directed in fibers over very long distances with very low losses and avoid atmospheric influences.CD videodiskIntroductionLaser plays an important role in our life it has a lot of applications in a lot of fields. It is used in many fields like medical, scientific, and industrial. In this part Ill mouth about some industrial uses of the laser like CD DVD Holography.Figure 49 cdWe all kn ow the importance of CDs and DVDs in our life. We use it in saving data, music albums, and videos.CD means Compact Disk optical media that can store data, and DVD means Digital Video Disk, and its also optical media to store data but with larger storage size, and much greater capacities.Figure 410cd romSo I can say that we have two types of magnetic discs and three types of drivers for the disks we have CD and DVD, the difference between them would be in the storage size.For the drivers we have CD-ROM, CD-RW, and DVD-RW. The difference between the CD-ROM and CD-RW that the CD-RW has the ability to read and draw up data on the CD, but CD-ROM can only read from the CD. So its like read only memory DVD drive can read and write on both CD and DVD disks, and has a larger storage memory than CD, so DVDs is more useful and better than CDs.Figure 411 Reading from CDHow CD and DVD drivers work?Computer takes the data from the user through keyboard, microphone, or any input device and conve rts it to zeros and ones. The idea is to store the data from the computer to the disks write on the disk using a powerful laser beam that makes holes or bumps on the disk which represents zeros and grooves that represents ones, so we can write what we want on the disk. CD and DVD the both use the same method to record data on.Figure 412Data saved on CDTo read from disk, the drive uses beam of laser that reflects back to a sensor in the drive if it hits a groove or one, but it hits a bump or zero the beam reflects with an angel and doesnt hit the sensor through this operation the drive can read data from the disk.Differences between CDs and DVDsWe all already know that CDs have a storage size 700 Mega Byte, and DVDs have storage size start from 4 Giga Byte. Also DVDs could have multiple layers so its storage size could reach 17 Giga Byte, but CDs only have one layer. So we can say that CDs are much cheaper than DVDs, but DVDs are more useful, and have much greater storage size. So CD s are still preferred in publishing music albums, and DVDs are preferred in publishing movies.Also we can say that there is a big difference between the CD and DVD drivers. We would find that the DVD drivers use a thinner beam of laser than the laser beam of CD drive so it could make smaller grooves and bumps than CD drives, so it could write on both CDs and DVDs, but CD driver could only write on CDs and cant write or read DVDs.Figure 413 cd writing process Figure 414 Cd writing processApplications of laser in communicationsLaser radar (LADAR) or (LIDAR)Laser radar (LADAR) or (LIDAR) (Light Detection and Ranging) is similar to millimetre radar but it uses laser beams to find its target.The (LADAR) processor looks for familiar patterns in the scenes. The processor ceaselessly compares the scenes taken with the 3D files stored in the radar memory. It can scan large areas with very high precision and its ability to build a detailed depiction of the area. The (LADAR) sensor can look at the target from different angles.Laser radar seeker can detect objects features with very high definition up to 15 cm resolution from about 1000 meters. After the radar identifies the object it takes a 3D picture.Laser diodeLaser diode is a diode where the active medium is a semiconductor similar to light emitting diode this diode is used to produce n-p-n or p-n-p transistors that are used widely in electronic systems, these diodes are sometimes called injection laser diodes to distinguish between optically diodes.A laser diode is formed by doping a very thin crystal wafer on its upper surface using laser beam to produce a n type region and a p type region results in a p-n junction which is called a diodeLaser fibreA laser fibre is a glass or a plastic fibre that carries light through it.These fibres are used widely in fibre-optic communications which permits transmission over long distances and at higher bandwidth than other forms of communications. Fibres are used instead of me tal wires because signals travel across them with less loss and they are also immune to electromagnetic interference. Fibresare also used for illumination and sensors.Laser microphoneThe laser microphone is a device that uses a laser beam to detect sound vibrations in distant objects.The device takes vibrations as a pressure waves created by objects in the room (like person or an object), the laser beam is directed into the room from a window that hits the object then it returns back to the receiver that converts it to an audio signal.The minute differences in the distance travelled by the light as it reflects from the vibrating objects (are detected interferometrically is a technique used for diagnosing two or more waves by studying the pattern of interference created by their superpositions).A new type of laser microphones that uses laser and a smoke or vapour to detect the vibration waves in the air.Applications of laser in computerLaser barcode scannerThe laser beam bounces off a rotating mirror and scans the code, sending a modulated beam to a light detector and then to a computer which has the product information stored. Semiconductor lasers can also be used for this purpose, laser barcode scanners are the most common used barcode scanners, laser barcode scanner doesnt need to be in contact with the barcode to read it, it can read barcode 6-24 inches away from it.Laser printerA laser printer is a type of computer printers that rapidly produces high quality text and graphics on a plain paper.It is a computer printer that uses laser beam to produce an image an on a rotating drum before transferring it to the paper.As with digital photocopiers and multifunction printers, laser printers employ a xerographic printing process but differ from analogue photocopiers in that the image is produced by the direct scanning of laser beam across the printer photoreceptor.A laser beam projects an image of the page to be printed onto an electrically aerated rotating drum coated with selenium. Photoconductivity removes charge from area exposed to light, the drum then prints the image on a paper by direct contact and heat.Laser printers have many advantages than other printers like the speed of laser printer can vary widely, it can print 12000 pages in one hour. cobblers lastThis report has discussed the applications of laser in our daily life. We have shown the different applications of laser in communication compared with different systems that operate with electrical cables radio frequency. The application of laser in computer represented in each aspect in our daily life as laser printers, DVD and scanners. The use of laser in mechanical engineering such as welding and cutting. It is also used in measuring dimensions and analyzing object by using 3D scanning. After leaning all this application and advantages of lasers. We can not neglect the present of laser in our life. By the end of the report, the benefits of laser and its applications is clea r.