Defense A laser range Finder is an example of an application in the defense system of a country. To knock down an enemy tank, it is necessary to range it very accurately. Because of its high intensity and very low divergence even after travelling quite a few kilometers, laser is ideally suited for this purpose. The laser range finders using neodymium and carbon dioxide lasers have become a standard item for artillery and tanks. These laser range finders are light weight and have higher reliability and superior range accuracy as compared to the conventional range finders.
The laser range finder works on the principle of a radar. Diagram of a laser range finder. Application 2 : Civil Laser cutting is an example of a civil activity. Continuous wave lasers like carbon dioxide gas lasers are extensively used for cutting a wide range of materials, such as graphite, diamond, tungsten, carbide, all metallic foils, ceramics, sapphire, and ferrite. In most cases, continuous cutting is carried out with assist gases like oxygen, carbon dioxide, or air, which produces both mechanical and chemical action intensifying the thermal effects.
... devices that use this characteristic are laser range-finders, price scanners, surveying equipment and laser weapons. The laser has contributed to humanity as a powerful ... high energy density for welding and cutting. For example, the automobile industry makes extensive use of carbon dioxide lasers with powers up to several ...
This gas-assisted cutting is applicable to the metals of thickness up to 5 mm with cut-widths down to 30 µm. The most promising field of laser cutting is the cutting of steels of small thickness (several millimeters) and also of non-metallic materials. Use of laser cutters in the garment industry, a new and very useful application of the lasers, has been introduced recently in the developed countries. With the aid of computers, lasers can cut clothing many times faster than the tailors using old techniques.
It is now possible to slice the through several layers of thick cloth accurately and in a short time using a laser cutter. The laser system also consists of a computer, programmed with cutting instructions and patterns for various to garments. The laser beam, focused on the material cuts through the fabric, leaving impeccably smooth edges. Application 3 : :Miscellaneous Laser Printing is a common usage of laser in miscellaneous. For the last few years, there has been tremendous increase in the use of computers as an aid to the management, processing and dissemination of information.
The use of computers in generating bank statements, insurance, telephone and electricity bills as well as publicity brochures advertising mass-produced goods are typical examples of this development. The peripheral device required by the computer for all these applications is the printer. Today, use of computers in large data processing installations places very high demand on printers as regards its speed, character flexibility, and print quality. The conventional impact printers can no longer meet these demands because of their limited speed and character flexibility.
In the new generation printers, printing method is based on the principle of electro photography. Since the light source in such printers is a laser, these devices are called laser printers. Internal diagram of a laser printer. Application 4 : Medical Field Lasers are extensively used in medicine and surgery. The first practical application was in eye surgery, where laser was used to weld detached retina and photocoagulate the blood vessels that grow into the region in front of the retina, thereby blocking vision.
The laser beam easily passes through transparent portions of the eye, including Cornea and lens to the region of its intended use where its energy is absorbed for treatment. Retina is a sensitive membrane inside the eyeball. Its detachment from the surrounding choroid coat initiates due to a hole in the retina caused by an injury or degenerative changes during the old age. This makes the thick fluid vitreous humour seep and fill itself between the retina and chord oat. The pressure between the retina and choroid coating damages the retina which soon gets detached from the optic nerve at the back of the to cause blindness.
Activities - Case Study 1 1. Write down all the possible ways that a computer could be used to assist the running of the hotel. Give as much detail as possible. A computer could be used for: Word processing: The word processor could be used to write letters, e. g. to write to customers to confirm their booking at the hotel or to order goods from suppliers. Notices and menus could also be produced ...