What affects the measurement accuracy of infrared thermometers
Since infrared temperature measurement technology is widely used in industry and other fields, higher requirements are also placed on its measurement accuracy. Non-contact infrared human body thermometers are becoming more and more perfect in function and technology. However, there are also factors that affect its accuracy. If more attention is not paid, the measurement accuracy of the infrared thermometer will be biased. So, these influencing factors What?
Measure angle
In order to ensure accurate measurement, the instrument should try to measure along the normal direction of the surface of the object being measured (perpendicular to the target surface being measured). If it cannot be guaranteed to be in the normal direction, the measurement should also be carried out within an angle of 45° from the normal direction, otherwise the instrument display value will be low.
ambient temperature
The instrument should be used strictly in accordance with the ambient temperature indicated by the technical specifications of the instrument. If it exceeds this range, the measurement error of the instrument will increase or even be damaged. When the ambient temperature is high, air-cooling, water-cooling devices or thermal protective sleeves can be used. The thermal protective sleeve allows the instrument to be used normally in environments up to 200°C.
When the handheld thermometer is used from one environment to another with a large difference in ambient temperature, the accuracy of the instrument will be temporarily reduced. In order to obtain ideal measurement results, the instrument should be left at the work 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 instrument's measurement error will increase. Therefore, it is best to keep the lens clean frequently, and an air purifier can help keep the lens free of contamination.
electromagnetic interference
The instrument should be kept as far away from potential sources of electrical interference as possible, such as electrical equipment with large load changes. Use shielded wires for the output and input connections of online instruments and ensure that the shielded wires are well grounded. In strong interference environments, use external protective conduits. Rigid conduits are better than flexible conduits. Do not route 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 light path, causing measurement errors. In order to overcome the influence of environmental radiation, we must first prevent environmental radiation from directly entering the optical path, and try to make the measured target fill the instrument's field of view. Indirect interference from environmental radiation can be eliminated by blocking.
Field of view and target size
Make sure that the target enters the measuring 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 target size more than twice the field of view spot.
Therefore, when using an infrared thermometer to measure, pay attention to its measurement angle, ambient temperature, electromagnetic interference and other issues, so that you can obtain highly accurate data and avoid unnecessary troubles.
