Ultraviolet band is in the range of 10nm to 400nm. When sunlight passes through the atmosphere, it cannot reach the earth's surface and form a blind area since the ozone layer has a strong absorption of ultraviolet from 240nm to 280nm. Therefore, the solar blind ultraviolet camera can be full-time used and has high reliability, low rate of false positives, and the advantages of strong anti-interference ability due to its elimination of the influence of the sun and other spectrum.

Principle of Corona Discharge Ultraviolet Imaging Detection
When the high voltage equipment electric discharges, the surrounding air will be ionized. During the ionization process, the electrons in the air molecules keep getting energy from the electric field. When electrons return from the excited state orbital to the original stable electron energy orbital, it releases energy in the form of corona, flash-over or spark discharge accompanied by ultraviolet radiation. Ultraviolet camera is using this principle to detect the ultraviolet signal during the process of high voltage electrical equipment discharge and display the processed real-time signal on the screen in order to diagnose discharge position and intensity and providing more reliable basis for evaluation of equipment running status.

The Difference between Ultraviolet Camera and Other Detection Methods
At present, the detection methods of corona discharge mainly include ultrasonic detection, infrared thermal imaging detection and ultraviolet image detection.

Parameter Name	Parameter Value
Applications	industrial
Technology	digital
Function	corona and partial discharge detection thermal imaging
Spectrum	infrared, ultrasonic, ultraviolet