How to measure the temperature of the surface of the UV weathering test chamber sample

The UV weathering test chamber uses a blackboard thermometer or a black standard thermometer to monitor the maximum temperature that can be reached on the surface of the sample. This value is also one of the main parameters of the UV weathering test chamber. During the test, the temperature of the surface of the sample depends on the temperature of the air around the sample, the thermal conductivity inside the sample, the heat transfer rate between the sample and the air, and the heat transfer rate between the sample and the sample holder. However, it has little to do with the radiation of fluorescent UV lamps. This should be noted that this is also different from other artificial light sources, mainly because there is almost no visible light and infrared rays in the radiation of fluorescent ultraviolet lamps, so there is no thermal effect. Current UV weathering test chambers are commonly monitored using a blackboard thermometer that is typically mounted in a sample exposure location. Such thermometers and specimens are subject to the same test conditions.

The basic difference between the black standard thermometer and the blackboard thermometer is that the black standard thermometer is installed adiabaticly, and the blackboard thermometer is not insulated. Therefore, some standards refer to the black standard thermometer as the insulated blackboard thermometer, and the blackboard thermometer as the non-insulated blackboard thermometer. . Normally, the black standard thermometer displays a higher temperature than the temperature displayed by the blackboard thermometer. In the ultraviolet weathering test chamber, the difference between the two is small, not exceeding 2 °C. The well-known domestic brand Yashilin Instruments specializes in the production of environmental testing equipment, and its ultraviolet light weathering test box uses a blackboard thermometer.