面向非稳态传热的热像仪相对测温性能评估

提出了一种热像仪相对测温的性能评价方法。将薄片热电偶的热节点固定在温度场均匀的加热单元表面，作为标准辐射温度发生单元，被待评价的热像仪观测和测温，对比热像仪观测的热电偶热节点表面温度场数据和热电偶自身测得的温度数据的相似度，对热像仪相对测温性能进行评价。基于国内外4个品牌的7款不同规格热像仪进行测试，结果表明热像仪的相对测温误差和绝对测温误差相差较大，相对测温误差通常介于噪声等效温差和绝对测温误差之间，同时发现6号热像仪性能较差，温漂严重，通过装置中的A、B两靶标同时测试热像仪性能，评价结果的标准差均在8%以内，这表明该方法具有较高的可靠性，对热像仪相对测温性能评价研究有一定的参考意义。

Evaluation of Relative Temperature Measurement Performance of Thermal Imager for Unsteady Heat Transfer

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.