Abstract：The relative temperature measurement of thermal imager is widely used in the test field. Its time-varying characteristics, nonlinearity and radiation source size effect lead to the error of relative temperature measurement, which brings inconvenience to the uncertainty analysis of test results. Therefore, a performance evaluation method of relative temperature measurement of thermal imager is proposed. The thermal node of the sheet thermocouple is fixed on the surface of the heating unit with uniform temperature field as the standard radiation temperature generating unit. The thermal imager to be evaluated is observed and measured. The relative temperature measurement performance of the thermal imager is evaluated by comparing the similarity between the surface temperature field data of the thermocouple thermal node observed by the thermal imager and the temperature data measured by the thermocouple itself. Based on 7 thermal imagers with different specifications of 4 brands at home and abroad, the results show that the relative temperature measurement error and absolute temperature measurement error of the thermal imager are quite different, and the relative temperature measurement error is usually between the noise equivalent temperature difference and absolute temperature measurement error. At the same time, it is found that the performance of No.6 thermal imager is poor and the temperature drift is serious. The performance of the thermal imager is tested at the same time through the targets A and B in the device. The standard deviation of the evaluation results is less than 8%, which shows that the method has high reliability and has a certain reference significance for the evaluation of the relative temperature measurement performance of the thermal imager.
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2022, Vol. 43 
