大口径高发射率面型黑体辐射源的研制

黑体辐射源作为定标标准器,在红外测量设备的辐射定标中具有重要作用。为应对大口径红外测量设备的辐射定标工作需求,设计了1台辐射面积为400mm×400mm的面型黑体辐射源。采用多路控温和连接固定冷源的方式对黑体进行温度控制;通过热仿真确定合适的传热模型,同时结合高发射率涂层工艺与辐射面的结构设计使黑体具备高发射率,辐射面有效发射率可达到0.992;在真空环境下,利用标准铂电阻温度计测量得到黑体辐射面源的温度均匀性偏差最大为0.101K,稳定性平均值为0.018K/10min,该黑体辐射光源能够满足现阶段大口径红外测量设备的使用需求。

Development of Large-aperture and High-emissivity Surface Blackbody Radiation Source

As a primary standard,the black body radiation source plays an important role in the calibration of infrared measurement equipment. In order to response the needs for the radiometric calibration of large aperture infrared measurement equipment,a surface blackbody source whose area is 400 mm × 400 mm has been designed. The temperature control of the blackbody is carried out through the multi-channel temperature control method and the method of connecting a fixed cold source. The appropriate heat transfer model has been determined by thermal simulation. Combining high emissivity coating process and structural design of the radiating surface makes the black body have high emissivity,the effective emissivity of the blackbody’s radiating surface is 0. 992. The temperature maximum uniformity deviation of blackbody radiation source measured by standard platinum resistance thermometers is 0. 101 K and the average stability is about 0. 018 k/10 mins, it can satisfy the requirement of blackbody radiation sources for large aperture infrared measurement equipment.