LASERS EVERYWHERE
Lasers
Look at the pictures and match a conventional device with its laser equivalent.
What are their functions?
E. G. [a] and [b] are both used for measuring distances/ to measure distances.
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| a | b | с | d |
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| e | f | g | h |
What advantages do laser devices have? (cheaper; faster; more accurate; more efficient etc)
What other laser devices do you know?
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3D laser scanning; laser barcode scanner; laser cutting; laser drilling; laser engraving; laser gyroscope; laser intruder alarm; laser lighting display; laser measure; laser pointer; laser printer; laser rangefinder; laser speed gun; laser sight; laser welding; lidar
2. *Fill in the gaps with the names of laser devices from the box above
_________ (Light Detection and Ranging) is a remote sensing method used to examine the surface of the Earth.
Laser _____ is a manufacturing technique to join two or more pieces of material (usually metal) together using a laser beam.
Laser ______ is a device on a firearm that uses a laser to take a precise aim.
Laser____ ___ is a handheld device used by the road police to measure the velocity of a vehicle.
Laser________ an instrument for finding the distance of an object from the observer.
Find the English equivalents
Дальномер; лазерная указка; лазерный прицел; лазерная сварка; резка лазером; лазерная гравировка; сканер штрих-кода; лазерное шоу.
Answer the questions and do the reading task
1. Some people say that laser is more present in our life than a wheel. Do you agree with this? Name the spheres where laser is used.
2. Read the texts below and match the paragraphs to the headings. Note! One paragraph is extra
Information Technology Manufacturing Measurement and analysis
Medicine Military Scientific research Telecommunications
semiconductor, n – полупроводник, полупроводниковый
fibre (fiber), n – волокно
fibre-optic, adj – оптоволоконный
via, prep – через, посредством
amplifier, n – усилитель
amplify, v – усиливать, увеличивать
fine, adj – тонкий, мелкий
increasingly, adv все чаще
melt, v – плавить, расплавлять
employ, v – использовать
wavelength, n – длина волны
tiny, adj – крошечный; миниатюрный
matter, n – материя
reveal, v – выявлять, обнаруживать
scale, n – масштаб
| Information Technology One of the application of lasers is in optical storage devices (e.g. CD and DVD players), in which a focused beam from a semiconductor laser, less than 1 mm wide, scans and reads the disc surface. Other everyday uses include barcode readers, laser printers and laser pointers. Over the past 25 years the publishing and newsprint industries have been revolutionised by the use of lasers, which have replaced traditional “hot metal” printing. | |
| ______________ Another large application is in fibre-optic communications. Broadband* depends on the transmission of light pulses along optical fibres, which are generated and relayed** via lasers. This is made possible by fibre amplifiers, which are an important component in long-distance fibre links. | * широкополосная сеть ** передаваться |
| _______________ Lasers can deliver concentrated energy in the form of fine controllable light beams, so physicians* soon took advantage of them to perform micro-surgery, which involves less pain and scarring**, lower blood loss and shorter recovery time in hospital. One of the most frequent uses of lasers is in eye surgery to treat disease and, increasingly, improve bad eyesight. | * врачи ** образование шрамов |
| ________________ Lasers can deliver enough power to heat and melt metal joints, and so are used for welding, as well as for cutting. When controlled by a computer, a laser can cut complex designs into a material such as wood or paper, as is increasingly being seen in furniture and other home goods. | |
| ________________ Lasers have long been used by the military for range-finding, but now even estate agents* employ laser tape measures. Because lasers can be modified to produce specific wavelengths, they are used to analyse chemical and physical structure, and so are used in factory quality control and to monitor environmental pollutants remotely. Lasers can be used for a type of measurement called interferometry which can measure tiny changes in distance. | *риелторы |
| ________________ Without lasers, many recent discoveries would never have been made. Lasers interact with matter at the quantum level in very specific ways and so are important tools in research. They can be used to follow chemical reactions and reveal structure at the atomic and molecular scale. Increasingly, life scientists are employing lasers in new types of microscopy designed to highlight cellular* structures. | *клеточные |