Influence of environmental factors on the ultraviolet aging test chamber (previous chapter)
The ultraviolet aging test box uses a fluorescent ultraviolet lamp as the light source. By simulating the ultraviolet radiation and condensation in natural sunlight, the material is subjected to an accelerated weather resistance test to obtain the results of the weather resistance of the material. It can simulate the environmental conditions of ultraviolet, rain, high temperature, high humidity, condensation, darkness and other environmental conditions in the natural climate. By reproducing these conditions, they are combined into a cycle and let it automatically complete the number of cycles. In the daily industry, how will the equipment testing be affected by environmental factors? The following is our professional explanation for everyone.
Environmental factors affecting the UV aging test chamber:
1. Temperature in the box
During the irradiation or shutdown period, the temperature in the box should be controlled by the specified test procedures (A, B or C), and the relevant specifications should specify the temperature to be reached +40 degrees or +55 degrees during the irradiation phase according to the intended use of the equipment or component ;
2. Airflow speed
In addition to affecting the temperature rise of the sample, the velocity of the air flow near the sample surface even causes significant errors in the open thermopile that monitors the radiation intensity. Generally, the speed of 1m / s causes the temperature rise of the thermopile to decrease by more than 20%. It can be seen that while effectively controlling the temperature (or) conditions in the ultraviolet test chamber, the airflow speed should be monitored, and the lowest speed should be used as much as possible. In addition, when adjusting the temperature in the box, high-speed airflow can be avoided by heating or cooling the box wall.
In the natural environment, the probability of the occurrence of strong solar radiation and the special condition of zero wind speed is extremely small, so when it is necessary to assess the impact of different wind speeds on samples of equipment or components, the relevant specifications should specify specific requirements;
3. Surface pollution
Dust and other surface contaminants will seriously change the absorption characteristics of the surface of the illuminated object. Unless otherwise specified, the sample should be clean during the test, but when evaluating the effect of surface contaminants, the relevant specifications should specify the necessary contents of the sample surface treatment.
We will stop here in this chapter. In the next chapter, we will continue to tell you the whole story. Please pay more attention to it!
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