双通道热红外标准辐亮度计定标方法研究

Reseach on calibration method of double-channel thermal-infrared standard radiometer

黑体辐射源作为初级标准,其辐射特性的测量精度决定了整个标准传递链路的不确定度。为了提高黑体的辐亮度测量精度,研制了一台可直接观测黑体辐亮度的双通道热红外标准辐亮度计。根据仪器的工作原理,采用自行研制的高精度水浴黑体获取标准辐亮度计的定标系数。实验结果表明,该辐亮度计的1h信号非稳定性优于0.3%,定标系数拟合不确定度优于1.23%,5μm通道整体不确定度为0.39%,10μm通道整体不确定度为1.3%。可实现黑体辐亮度与实验室辐射标准之间的传递。

Blackbody radiation source as a primary standard,its measurement accuracy determines the uncertainty level of the whole traceability link.To improve the measurement accuracy of blackbodies′radiance,a double-channel thermal-infrared standard radiometer was developed.According to the principle of the instrument,calibration coefficients of the standard radiometer were obtained by using a high accuracy water-bath blackbody.Experimental results suggest that the radiometer′s instability is less than 0.3%within one hour,uncertainty of fitting coefficient is less than 1.23%,and combined uncertainty is less than 0.39%,1.3%in 5μm and 10μm channel respectively.This radiometer provides new means for tracing blackbody radiance directly to radiant standard in lab.