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Infrared Waterproof Camera Fog Vapor Problems Solving fog and water vapor problems can be solved by the following ways.
In the first case, fog occurs inside the machine:
The formation of fog and frost is caused by the condensation of saturated steam in the air, which is condensed into frost and fog due to the strong and weak cold environment. During the working process of the infrared camera, especially the indoor camera often causes fog or frost on the protective window glass due to fog or water vapor. As a result, the camera cannot see the object directly, which directly affects the monitoring effect.
The solution to this problem is also different for each family. Increase the defrosting circuit, open vent holes, charge nitrogen, add fans, put desiccants and so on. The method is not the same, and the effect is certainly not the same. Some can solve the problem, and some still cannot solve the problem. However, from the most basic point of view, it is necessary to strictly control the cleaning of materials and try to prevent the presence of volatiles. For example, the PCB board cannot have residual flux, and the light-shielding rubber sleeve is made of high-quality silicone material.
In the second case, frost and fog appear outside the machine:
The camera works in a high-humidity environment, and the window glass of the protective cover is prone to dirt, causing camera vision to block.
Solution: 1. Increase the wiper on 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 functions of repelling water, dust and the like.
Finally, for high humidity conditions, some requirements for the shell seal if the infrared waterproof camera is applied in the north, there will be a large temperature difference inside and outside the body, the front of the lens will appear atomization, so the machine must have a good The tightness of the protective cover must also have good rainwater resistance.
At this stage, there are certain technical problems in the sealing technology of the mainland, such as the design of the housing, and in places such as joints and screw interfaces, where leakage occurs.
How to make the seal better? The basic solution is this:
First, add waterproof rubber sleeve, add water pad at the interface, play a role in waterproof, the effect is more ideal.
Second, in the connection screw mouth waterproof glue, enhance water resistance.
Third, infrared waterproof camera using aluminum alloy shell, improve the accuracy of the interface, and the use of high-quality silicone material, the effect is also more ideal.
Infrared waterproof camera image problem solution
Why is the infrared waterproof camera flashing? As mentioned before, the infrared lamp turns on when the illumination intensity is lower than the threshold. Closes above the threshold. Let us consider the case when the illumination intensity is slightly lower than the threshold: the photosensitive element detects that the illumination intensity is slightly lower than the threshold, and controls the infrared lamp to turn on and emit light. After the infrared lamp emits light, the detected illumination increases (plus the anti- The returned infrared light exceeds the threshold and controls the infrared lamp to turn off - resulting in a decrease in the detected illumination, and once again controlling the infrared lamp to turn on. This does not stop, causing the image to flicker. This kind of situation is the principle reason, not to say it is normal, at least not the quality of the product.
The first is to extend the use time of IR waterproof camera IR lamps and affect the service life of the products.
The second is to turn on the infrared light for situations in which color images can still be produced, which will cause the image quality to drop at this time;
The third is the generation of infrared eye on the color image (infrared eye is also determined by the principle, people do not want to see the phenomenon). If the threshold is low, the infrared light may not turn on in time when additional lighting is needed.
Current ordinary infrared waterproof cameras generally use photosensitive elements to detect the illumination intensity of the environment in which they are located. According to the threshold determined in the design parameters, control signals are generated to enable the opening of the infrared lamps. The level of the threshold depends on the environment used, the preferences of the users, and the degree of importance of the designer considering various factors. The products of the manufacturers are different. Such as 20,10,5 Lux. When the threshold is high, the opening time is earlier. It is possible that the camera has not yet converted from color to black and white, and the infrared lamp is turned on. This will have three disadvantages.
So how to solve this problem?
The ambient illumination detected by the photosensitive element is slightly lower than the threshold, which is a problem. There are two situations:
First, at a certain time in the evening, for a short time, this problem arises. If we do not want to increase the cost, we should use general mindsets. Our idea is to explain the reasons to users and tolerate it.
Second, this issue must be resolved when the lighting intensity is stable.
1. Change the threshold.
In the same model, the thresholds are also different and there is a discrepancy. The problem may be solved by replacing a product.
Manufacturers provide products with different design thresholds for replacement.
Products with higher threshold design parameters are less likely to flicker.
2. Change the environment to change the intensity and angle of lighting.
A slight change in the installation angle of the infrared waterproof camera, moving up and down, the illuminance detected by the detector will have a lot of changes, it will leave the vicinity of the threshold, so as to solve the problem of flicker.
3, the use of high-quality low illumination with backlight compensation anti-glare camera film, especially special IR lens;
In addition, when a person or other object near the infrared waterproof camera reflects infrared light, the detected illuminance changes repeatedly, causing flicker. For example, when doing demo tests, inspections, and the installation position of the camera is low, when an object covers the camera at close range.
This is not a problem. When the IR waterproof camera is in the normal installation position, this phenomenon is naturally gone. As a demonstration, just pay attention not to direct infrared light from a very close distance back to the photosensitive element.
Infrared waterproof camera image problem solution
In the security television monitoring system, with the improvement of people's safety awareness, the need for 24-hour continuous monitoring of television monitoring in important venues and the maturity of infrared imaging technology, the use of infrared waterproof cameras has become increasingly high and has gradually developed into a Trends.