What is UV (Ultraviolet)?

With the pandemic we are experiencing, UV has become a very curious topic. UV (ultraviolet) is called radiation with a wavelength ranging from 10 nm to 400 nm. Since the human eye can perceive rays above 400 nm wavelength, we cannot see UV rays. UV rays are divided into four according to their wavelengths. In HVAC sector, UV-C type short wave rays are used for disinfection.

Although UV lamps seem like a very new technology, their history is more than 100 years.\ UV rays, on the other hand, are much older. UV rays, which have existed since the creation of the universe, awaited to be discovered for a very long time. German scientist Johann Wilhelm Ritter was the first to discover the existence of ultraviolet rays.

 

 

Definition

Wavelength

Area Of Use

UV-A

Long Wave UV

315-400 nm

Solarium

UV-B

Middle Wave UV

280-315 nm

Treatment

UV-C

Short Wave UV

200-280 nm

Disinfection

UV-V

Vacuum UV

100-200 nm

Ozone production, Odour Removal, Grease Filtration

Table 1. UV Types

UV Spectrum

Figure 1. Electromagnetic Spectrum

As can be seen from the graphic in Figure 2, the germicidal effect of UV light is in the wavelength range of 220-300 nm. The wavelength at which this effect is highest is 265 nm. Many UV-C lamps on the market are low-pressure mercury type lamps and mostly produce beams of 253.7 nm wavelength. Although the 253.7 nm value is close to the peak, it should be known that microbes are not killed with 100% efficiency. In addition, considering the losses caused by the ballasts of the lamps, it can be said that the efficiency of UV lamps is quite low. It is accepted that an average low-pressure mercury UV lamp produces UV light at a rate of approximately 25-35% of the declared electrical power.

Figure 2. Wavelength germicidal graphic [1]

Although UV lamps seem like a very new technology, their history is more than 100 years.\ UV rays, on the other hand, are much older. UV rays, which have existed since the creation of the universe, awaited to be discovered for a very long time. German scientist Johann Wilhelm Ritter was the first to discover the existence of ultraviolet rays.

As can be seen from the graphic in Figure 2, the germicidal effect of UV light is in the wavelength range of 220-300 nm. The wavelength at which this effect is highest is 265 nm. Many UV-C lamps on the market are low-pressure mercury type lamps and mostly produce beams of 253.7 nm wavelength. Although the 253.7 nm value is close to the peak, it should be known that microbes are not killed with 100% efficiency. In addition, considering the losses caused by the ballasts of the lamps, it can be said that the efficiency of UV lamps is quite low. It is accepted that an average low-pressure mercury UV lamp produces UV light at a rate of approximately 25-35% of the declared electrical power.

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