Influence of Environmental Temperature and Humidity on the Temperature Accuracy of Infrared Thermometers
Based on the principle of infrared temperature measurement and the working principle of infrared frontal thermometer,the study analyzes the influence of ambient temperature and humidity on the accuracy of infrared frontal thermometer.Then the study selects 13 infrared thermometers with high sales and the price range from 0 to 200 as the research objects,uses a walk-in environmental test chamber as the temperature and humidity environment simulation device.The maximum allowable error within the temperature display range in"GB/T 21417.1-2008"is taken as the temperature accuracy requirement of±0.2 ℃.The temperature accuracy of the infrared thermometer is measured under the conditions of 5 ℃-40 ℃ temperature,and 20％RH～93％RH humidity.The results show that within the temperature range of national standard,nominal working,and daily use,there are 1,3,and 4 samples respectively that can not meet the temperature accuracy requirements.The distribution of non conformity is as follows:3 samples at 10 ℃,1 sample at 35 ℃,and 2 samples at 40 ℃.The maximum error is+0.5 ℃ at 40 ℃.Within the national standard,nominal working,and daily humidity range,there are 3,4,and 4 samples respectively that cannot meet the temperature accuracy requirements.The distribution of unqualified situations is:3 samples at 85％RH and 12 samples at 93％RH,with a maximum error of-0.7 ℃ at 93％RH.Most infrared thermometers sold on the market have compensation algorithms for temperature,which can ensure temperature measurement accuracy within a good environmental temperature range(16 ℃～35 ℃).However,the temperature compensation algorithms for low and high temperature environments need to be improved.When the humidity is ≤80％RH,the infrared thermometer can meet the accuracy requirements for temperature measurement.However,as the humidity increases to 85％or above,the accuracy of infrared thermometer temperature measurement significantly decreases,and the error of temperature reading below the actual temperature gradually increases.
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