Precision calibrating method of infrared thermometer with wide temperature range

Abstract

The invention discloses a precision calibrating method of an infrared thermometer with a wide temperature range; the method comprises the steps: firstly, acquiring initial temperature values measured by the infrared thermometer according to experiments and drawing into a discrete point drawing; performing segmented fitting for the initial temperature values acquired by the infrared thermometer and a true temperature curve by means of a least square method, and acquiring a correction coefficient of each temperature interval; and finally, correcting the initial temperature values according to the corresponding correction coefficients of the initial temperature values, acquired by the infrared thermometer, in the temperature intervals and acquiring one temperature value which is closer to the actual temperature than the initial temperature values. The measuring precision of the infrared thermometer is improved and the measuring error is reduced.

Description

technical field [0001] The invention relates to an infrared thermometer, in particular to an accuracy calibration method for an infrared thermometer with a wide temperature range of -40°C to +70°C, so as to meet the requirement of measurement accuracy of ±1°C. Background technique [0002] Infrared thermometer has the characteristics of short response time, wide measurement temperature range and high measurement accuracy, and is widely used in the field of object surface temperature measurement. The change of temperature will cause great stress inside and cause material fatigue, which will affect the service life of the material. Accurately testing the change of temperature on site is of great significance for the study of service life and material aging and degradation performance. [0003] Although the current non-contact infrared temperature thermometer can measure high and low temperatures in the environment of –40°C to +70°C, and the test results are accurate, its respo...

AI Technical Summary

Problems solved by technology

[0003] Although the current non-contact infrared temperature thermometer can measure high and low temperatures in the environment of –40°C to +70°C, and the test results are accurate, its response speed is slow, and the response time can even be as long as tens of seconds. On-site data collection brings great inconvenience

At present, the working temperature range (0℃~50℃) of commercialized ordinary non-contact infrared temperature thermometers is not exactly the same as the test temperature range, although some commercially available infrared temperature thermometers can work at 0℃~50℃ It can test the temperature source of –18℃~+250℃, but when this temperature tester works in the environment of high temperature above 50℃ and low temperature below 0℃, it shows that the test error is large and exceeds the accuracy requirement. Obviously this kind of The thermometer cannot fully meet the needs of accurate temperature measurement in the environment of –40℃~+70℃

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