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The working principle of the ultraviolet flame sensor

by:Tianwang     2020-06-27
Uv sensor working principle: uv sensor only to the narrow range of 185 ~ 260 nm uv responds, and is not sensitive to other spectrum of light, can use it to detect ultraviolet light from the flame. As shown in figure 1, it is a closed and can through uv glass tube, tube filled with a special kind of gas. Inside the glass tube has a pair of electrodes arise out of the metal wire - — Anode and photocathode photocathode by only sensitive to uv light metal materials, fire photoelectron under ultraviolet light. Uv sensor working principle is based on the photoelectric emission effect of metal and electronic numerous flow theory. In between anode and cathode electro-optical sensor and voltage, the electric field is established between the poles. When ultraviolet radiation through the glass to the photocathode, can produce effect of photoemission, photoelectron fired from the surface of the photocathode, which under the action of electric field in high speed collision of gas molecules around it, make its ionization for the positive ions and electrons. Electrons are accelerated after the ionization and with great energy to continue ionization gas molecules, the other end at the anode; And molecular ionization gas to produce positive ions, in under the action of electric field also is accelerated, crashed into the photocathode, resulting in more electrons. The process cycle, between the anode and the photocathode will quickly form a large current and discharge. This phenomenon is called electronic numerous streams. Begin to produce at the time of discharge voltage is called 'initial discharge voltage VL.
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