1, the fog on the lens is tiny water droplets formed by the condensation of water vapor in the air on the lens surface at low temperature. There are two conditions to form fog: there is moisture in the air, and the temperature of water vapor is higher than that on the lens.
2, if you want to lens fog, there are three main methods:
(1) Mechanical disassembly-similar to window cleaner; ?
Adding wipers to glasses is a mechanical defogging method, which is unsightly, heavy and unrealistic.
(2) Reduce the temperature difference, avoid contact with wet air higher than the lens surface temperature or preheat the lens surface temperature to even higher than the new ambient temperature in advance; ?
Usually, it is necessary to place the glasses in a new and possibly foggy environment, so that the temperature of the lenses is the same as the ambient temperature (the window blows cold air to demist) or higher than the air temperature (the window blows hot air to demist), or completely avoid the steam environment. This method is to destroy the fogging condition. Such a solution is contact lenses, otherwise the glasses will be difficult to use normally.
(3) Reduce the surface tension of the fog beads, so that all the fog beads on the lens are tiled to form an ultra-thin water film that does not interfere with vision.
It is the most real way to turn the fog beads on the lens into water films that do not hinder vision. At present, there are special anti-fog lenses on the market, and the lenses are coated with special anti-fog films, which can effectively reduce the probability of fog generation. When it is used with special anti-fog cleaner, the anti-fog cleaner can be kept relatively firmly on the outer surface of the lens, and the long-lasting anti-fog ability of the lens can be realized, which can last for up to 7 days. ?
Extended data:
Classification of organic antifogging mirrors;
(1) coated anti-fog lens:
The formation of fog layer is prevented by coating micropores. It can be used to seal holes in mirrors and glass, and the anti-fog coating is generally rich in conductive materials A TO and silicon oxide. Forming a super hydrophilic antistatic antibacterial agent with poor antifouling, antifogging and antistatic effects.
(2) electrothermal anti-fog lens:
The humidity of the mirror surface is increased by electric heating. Therefore, no fog layer will be formed. In addition, the fog evaporates quickly. There are other types of anti-fog mirrors on the market.
(3) Nano-composite anti-fog lens:
Nano-glass antifogging mirror film is firmly combined with glass through physical and chemical phases. Because water cannot form water droplets on the surface of the substrate, the treated glass surface has hydrophilic function. But a uniform water film is formed, so as to achieve the effect of anti-fog.
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