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UV sensor schematic circuit

2014-11-09 13:59  
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UV sensor schematic circuit
The figure is a schematic circuit of UV sensor. When UV sensor is coupled by voltage between the cathode and anode, and the UV radiation gets through the quartz glass tube on the cathode of the optical surface, because of the cathode material coated with electron emission, cathode will release photoelectrons.Influenced by the strong electric field, photoelectrons will be attracted to the anode, and high-speed movement of optoelectronics will lead to its collision with the gas molecules, which leads to ionization of them. Electron produced by ionization will further collide with gas molecules, and finally the cathode and the anode will be fulfilled by electrons and ions, causing the phenomenon of glow discharge, and the circuit generating a large current.When there is no ultraviolet radiation, there is no electrons and irons flow in the cathode and the anode , showing a very high level of impedance.