The influence of environment and background radiation on the thermometer
When conducting infrared detection of outdoor power equipment, the infrared radiation received by the detection instrument includes not only the radiation emitted by the corresponding parts of the tested equipment itself, but also the reflection of other parts of the equipment and the background, as well as direct solar radiation. These radiations will interfere with the temperature of the tested parts of the equipment and cause errors in fault detection. In order to reduce the impact of environmental and background radiation, the following measures should be taken:
① On site infrared testing of outdoor electrical equipment should be conducted on cloudy days or around sunset in the evening when there is no light. This can prevent direct incidence, reflection, and scattering of solar radiation. For indoor equipment, turning off lighting and avoiding other radiation effects can be used.
② 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 to find the best angle that can avoid reflection for detection.
③ To reduce the impact of solar radiation and surrounding high-temperature background radiation, appropriate shielding measures can be taken during detection, or appropriate infrared filters can be installed on infrared thermal imaging instruments to filter out solar and other background radiation.
④ Select instruments and detection distances with appropriate parameters for testing, so that the device being tested fills the field of view of the instrument, thereby reducing the interference of background radiation.
