What is an induction loop?
Induction loop is a form of technology used for various purposes that is based on the discovery of Michael Faraday, also known as Faraday's law, in 1831. The principle is based on double magnetic and electrical properties of electromagnetic fields generated in electrical circuits. One common example, has been used by an induction loop since 2011, is in buried electrical cables at car junctions. The stable current of the passing field will be disturbed when an iron metal, such as steel, gets close to the vicinity, and this can be used to start the traffic signal controls. Induction loops are also increasingly expanding to meet the needs of individuals who are not heard and rely on the listening device. These intersections are provided with loops that can detect how many vehicles are in the line, and adjust the frequency of the signal to improve the flow of the operation. Although this is not the only way to automatically control traffic at intersections is afterVoed as practical and cheaper than the methods used by cameras or infrared sensors based on thermally mounted on signal lights to detect vehicles.
The power of induction loops of operation control is reinforced by means of high -conductive materials for loop wires such as iron, steel and copper, and by placing overlapping induction cables in a row slightly outside the mid -wire circles or rectangles. This is useful for detection of wheels or motorcycles because they have a much smaller total metal mass than cars or trucks. The frequency of such loops is usually in the range of 20,000 to 30,000 Hertz, and when a car or other building passes through, the magnetic field present in the induction loop is reinforced by another metal that acts as an extended core for the cabling itself. This magnetic amplification prevents the flow of electric current in the loop because it acts as a type of induction interruptionon a standard alternating current (AC). Such changes are monitored by control circuits to register how many cars are present, or general total metal weight level at each point in the traffic light, so the lights can be changed accordingly.
Another common application since 2011 for the principle of induction loop is in a room -based device to increase the efficiency of hearing aids. The wire loop usually runs around the perimeter of the room, where lectures or other rally are held, called the sound frequency induction loop (AFIL). They can also be placed around the internal perimeter of cars and in the UK they are a requirement in all public taxis. In audience in audience, which connects to an induction loop for amplification of sounds, was originally supposed to capture a magnetic field generated by a phone to amplify the sound signal and was known as a telephone or telecoil switch to the hearing aid.
When someone speaks into a microphone at such a placeNespost or as a taxi driver, an induction loop shows the corresponding changes in its magnetic field that lifts the hearing aid and translates into sound. This is important for non -hearing, because hearing aids are often ineffective when carrying accurate sounds from a distance to the user. As the sound wave becomes increasingly distant, its elements with a higher frequency that make them understand the speech, as well as the total volume. This, along with mixed noise distortion of the background, are elements of sound for which hearing aids cannot compensate, and the induction loop in the room negates these effects at the same time for all in the rooms using the hearing aid.