红外辐射温度计的辐射源尺寸效应修正

Size-of-source Effect Correction for Infrared Radiation Thermometer

红外辐射温度计在低温测量的辐射源尺寸效应（SSE）的规律不同于高温测量。基于以虚拟探测器温度消除背景辐射影响的SSE计算模型，推导了在不同源尺寸和不同背景条件下辐射温度计输出的SSE影响修正公式；得出不同源尺寸条件下辐射温度计温度示值的SSE影响修正的理论解析表达式。在源温度低于或接近背景温度时修正模型与高温测量SSE修正模型有显著差异。所得结果适用于任意温度下对单波段辐射温度计的SSE影响修正。

The feature of the size-of-source effect （SSE） in low temperature measurement differs from that in high temperature measurement. A correction formula for the SSE in different source sizes and different background radiations is derived. It is from a calculation model at a suppositional detector temperature which can avoid the influence of background radiation on the SSE measurement. Theoretical analytical expression for the SSE in different source sizes are obtained, and the rule of the novel model and classical high temperature model are different at the source temperature lower than or near ambient temperature. The formulae and conclusion are suitable for the SSE correction for a temperature measurement at an arbitrary temperature.