Infrared thermometer ambient radiation
When conducting infrared testing of outdoor power equipment, the infrared radiation received by the testing instrument includes, in addition to the radiation emitted by the corresponding parts of the equipment under inspection, reflections from other parts of the equipment and the background, as well as direct incoming solar radiation. These radiations will cause interference to the temperature of the part to be measured on the equipment and bring errors to fault detection. In order to reduce the impact of the environment and background radiation, the following countermeasures should be taken: For on-site infrared detection of outdoor electrical equipment, try to conduct it on a cloudy day or in the evening around sunset when there is no light. This can prevent the effects of direct incident, reflected and scattered solar radiation. For indoor equipment, you can turn off the lighting and avoid other radiation effects.
For highly reflective equipment surfaces, appropriate measures should be taken to reduce the impact on solar radiation and radiation from surrounding high-temperature objects. Or change the detection angle and find the best angle to avoid reflection for detection.
In order to reduce the radiation effects of solar radiation and surrounding high-temperature background, appropriate shielding measures can be taken during detection, or appropriate infrared filters can be installed on the infrared thermal imaging instrument to filter out the sun and other background radiation.
Select an instrument with appropriate parameters and a detection distance for detection so that the part of the equipment being tested fills the instrument's field of view, thereby reducing interference from background radiation.
Troubleshooting of infrared thermometer
The core issue of infrared diagnosis of equipment faults is to accurately obtain the temperature distribution of the equipment under test or the temperature value and temperature rise value of the fault-related parts. This temperature information is not only the basis for judging whether the equipment is faulty, but also the objective basis for judging the fault attribute, location, and severity. Therefore, the calculation and reasonable correction of the temperature of the fault-related parts of the equipment under test will be a key link to improve the accuracy of the surface temperature of the detection equipment. However, when infrared detection of equipment is performed on site, due to changes in detection conditions and environmental influences, the same equipment may obtain different results due to different detection conditions. Therefore, in order to improve the accuracy of infrared detection, corresponding countermeasures and measures must be taken during the on-site detection process or during the analysis and processing of the detection results, or good detection conditions must be selected, or reasonable corrections must be made to the on-site detection results.
