Water FiltersWritten by Steven G. Conklin
Water, water, everywhere, but not a drop to drink! These golden words of Coleridge are very true, no matter where you live. Safe drinking water is a critical issue that requires attention and commitment of everybody to live healthily. Water Filters are a saving grace to this problem.
There are just too many water filters in market. Which one is right one for you? You need to take into account point from which you would filter tap water to filtration technologies. Installation and subsequent filter maintenance should also be considered in deciding a water filter.
There are basically two types of water filters. They are Point-of-Entry water filters and Point-of-Use water filters. The Point-of-Entry water filters start filtering incoming tap water when water first enters your home. The result is all water in your home is filtered. However, it would be a better health option to purify water before consumption. POE water filters are marvelous in removing sediments, chlorine and other toxins.
The other category of filters is called Point-of-Use water filters. These filters produce clean water for consumption, such as drinking and cooking. A POU water filter gets rid of various small or dissolved water contaminants and chemicals, and other microbes. It comes with one or more of basic water filtration technologies, like filtration, reverse osmosis, and distillation.
The efficiency levels of water filters as well as costs of operating filters are determined by water filtration technologies that are employed in filtering and purification process. The most advanced multi-stage and multi-filtration technologies are inevitable in producing purest and safest water for all your needs. It is also vital to note that operating costs of water filters would differ from one brand to another, though they might be using same technology for manufacturing process.
Night VisionWritten by Jonny McPhil
Night Vision is an optical device consisting of high-quality image intensifier tubes and optics that amplify existing light. The Night Vision gives you ability to see in conditions that are too dark for a naked eye. Every Night Vision product has an Infrared Illuminator. The Infrared Illuminator provides a light source for system to amplify images. It can give you enhanced images in very low light conditions, such as caves, where no ambient light is available for amplification of objects inside.
The working principle of a Night Vision is simple as well as interesting. In very dark conditions, available light, like starlight, moonlight or infra-red light is gathered by front Objective Lens of Night Vision. The objective lens then transmits it through a set of optical lenses to Electronic Intensifier Tube (EIT.). The high levels of energy that is produced by device's intricate power supply rap out electrons from Photocathode Screen, located on front of Electronic Intensifier Tube.
The same energy from EIT generates a highly static field, pushing electrons to Phosphorescent Screen, which is a very sensitive layer at back of EIT. These electrons strike Phosphorescent Screen with immense speed and allow it to illuminate. This whole procedure produces an image, which is then magnified by Ocular Lens located at back of Night Vision. By looking through ocular lens of Night Vision, you will see image as you see in a normal optical device.