What is Kohrerer?
Koherer is a type of radio wave detector and was one of the first such devices. It was first used at the end of the 19th century and believed that it was invented by French scientist Edouard Branly around 1890. Its development was an important step in wireless telegraphy and radio communication. A typical coherer was a small glass tube, sometimes with removed air, partially filled with shavings or irregular granules of conductive material, often nickel, silver or a combination of these two.
The principle of the functioning of the coherer includes the conductivity of the material in the tube under different conditions. Under normal conditions, the resistance of metal granules or shavings in the tube is relatively high due to imperfect contact between different small pieces of material. However, when exposed to radio waves, the conductivity of these particles as a whole rises, which means that the resistance is appropriately reduced. By installing The -kher in an electrical circuit capable of measuring differences in conductivity between the rest of the rest and stimulating conditionradio waves, it is possible to detect the presence of radio waves.
The consequences for such progress were immediately obvious, and Koherer and its applications were examined and developed by a number of famous pioneers in the field of radio and electronics such as Marconi and Tesla, among other things. The first and most important applications for the device was in wireless telegraphy. Infants could be converted to the impulses of incoming radio energy into an output in the form of Morse Code using a system of real sounds or very simple prints on paper, which could then be converted to a readable text using a telegraph qualified in Morse code.
It was quickly found that the particles at the coherer as soon as they were exposed to a radio wave to its original state when the radio pulse stopped. For this reason, wireless telegraphs using this device were designed with a second device called Dekoherer that automatically reset the cohereroVou tube after each pulse by mechanically affecting it to release the particles. This made it possible to quickly and automatic Morse code messages without wires.
After more than a century after its invention, it was not known exactly why Koherer works as he does. The predominant theory claimed that the presence of radio waves, the form of electromagnetic radiation, caused welding between particles at the molecular level and increased conductivity. This was an example that scientists could not quantitatively demonstrate the exact mechanism behind the observed phenomenon, but equally applied its function. Experiments of modern scientists have shown that this explanation is most likely correct.