What affects the measurement accuracy of infrared thermometers
measuring angle
In order to ensure accurate measurement, the instrument should try to measure along the normal direction of the surface of the measured object (perpendicular to the surface of the measured object) when measuring. If it cannot be guaranteed to be in the normal direction, it should also be measured within a 45° angle to the normal direction, otherwise the instrument display value will be low.
ambient temperature
The instrument should be used in strict accordance with the ambient temperature indicated by the instrument's technical indicators. If it exceeds this range, the measurement error of the instrument will increase or even be damaged. When the ambient temperature is high, you can use air-cooled, water-cooled devices or thermal protection jackets, which can make the instrument work normally in environments up to 200 °C.
When the hand-held thermometer is used in an environment with a large difference in ambient temperature from one environment to another, the accuracy of the instrument will be temporarily reduced. In order to obtain ideal measurement results, the instrument should be placed on the job site for a period of time (recommended At least 30 minutes) to allow the temperature of the instrument to reach equilibrium with the ambient temperature before use.
air quality
Smoke, dust and other pollutants in the air, as well as unclean lenses will prevent the instrument from receiving enough infrared energy to meet the measurement accuracy, and the measurement error of the instrument will increase. Therefore, it is best to keep the lens clean frequently, and an air purge will help keep the lens free from contamination.
electromagnetic interference
The instrument should be as far away as possible from potential sources of electrical interference, such as electrical equipment with large load changes. The output and input connections of the online instrument use shielded wires and ensure that the shielded wires are well grounded. In high interference environments, use external protective conduit, rigid conduit is better than flexible conduit. Do not lead AC power from other equipment into the same conduit.
environmental radiation
When there are other high-temperature objects, light sources or solar radiation around the measured target, these radiations will directly or indirectly enter the measurement optical path, resulting in measurement errors. In order to overcome the influence of environmental radiation, first of all, it is necessary to avoid environmental radiation directly entering the optical path, and the measured target should be filled with the field of view of the instrument as much as possible. For the indirect interference of environmental radiation, the method of shielding can be used to eliminate it.
Field of view and target size
Make sure that the target enters the measurement field of view of the instrument. The smaller the target, the closer it should be. In actual measurement, in order to reduce errors, it is best to make the size of the target more than twice the size of the spot in the field of view.
Therefore, when using an infrared thermometer to measure, pay attention to its measurement angle, ambient temperature, electromagnetic interference, etc., so that high-precision data can be obtained and unnecessary troubles can be avoided.
