The surveillance cameras are installed in damp places, which makes the lens of surveillance cameras prone to fog, which affects the quality of surveillance. In fact, problems such as mist and water vapor can be solved in the following ways.
In the first case, fog appears inside the surveillance camera:
The formation of fog and frost is due to the condensation of saturated water vapor in the air, which condenses into frost and fog due to the strength and weakness of the cold environment. In the working process of infrared cameras, especially indoor cameras, fog or frost is often formed on the window glass of the protective cover due to fog or water vapor in the venue, causing the surveillance camera to be unable to see objects clearly, which directly affects the surveillance effect.
The solutions to this problem are also different from each other. Add defrost circuit, open vent, fill nitrogen, add fan, put desiccant, etc. The method is not the same, the effect is of course different, some can solve the problem, some still can't solve the problem. However, from the most basic point of view, it is necessary to strictly control the cleaning of materials and try to eliminate the presence of volatiles. For example, the PCB board must not have residual flux, and the light-shielding rubber sleeve is made of high-quality silicone materials.
In the second case, frost and fog appear on the outside of the surveillance camera:
When the camera works in an environment with high humidity, the window glass of the protective cover is prone to dirt, which can block the camera's sight.
Solution: 1. Add a wiper to the protective cover, and clean the glass by controlling the wiper. 2. Use invisible wiper window glass. Compared with ordinary window glass, the invisible wiper window glass has the functions of repelling water and dust.
Finally, in the case of high humidity, some requirements for enclosure sealing
If the infrared surveillance camera is used in the north, there will be a large temperature difference between the inside and outside of the machine, and the lens at the front end will appear fogging. Therefore, the machine must have a good seal and the protective cover must also have good rain resistance. performance.
At this stage, Continental Technology has certain technical problems in terms of airtightness, such as the design of the housing, and most of the places where water leaks occur in the joints and screw interfaces.
How to make the tightness better? The basic solution is this:
1. Add a waterproof rubber sleeve and add a water pad at the interface to play a waterproof role and the effect is ideal.
2. Put waterproof glue on the connection screw mouth to enhance waterproofness.
3. The infrared surveillance camera adopts an aluminum alloy shell to improve the accuracy of the interface, and it is bonded with high-quality silicone materials, and the effect is also ideal.
