When monitoring wall temperatures in reactors and combustion chambers using infrared cameras, significant measurement errors occur due to the reflection of hot objects such as flames. The radiation received in the camera from the measured wall segment results from the sum of inherent wall radiation and reflected radiation. The reflection depends on the geometrical arrangement of wall, flame and camera as well as on material properties of the wall. To compensate the reflected radiation, existing methods require either detailed information about the geometrical arrangement and material properties of the reactor or a high level of technical equipment like multi-spectral cameras and polarization filters. In this paper we present a method, which does not require this information and equipment. It uses a simplified radiation model and experimental identification to determine the influence of hot objects (flames) on each wall segment of the reactor. The identified model can then be used to compensate flame reflections during normal operation of the reactor. We will demonstrate the new method using near infrared image sequences from a combustion chamber of a pilot-scale power plant.

当使用红外热像仪监控反应堆和燃烧室的壁温时，由于诸如火焰之类的热物体的反射，会产生明显的测量误差。摄像机从被测壁段接收到的辐射是固有壁辐射和反射辐射之和。反射取决于墙，火焰和摄像头的几何布置以及墙的材料属性。为了补偿反射的辐射，现有方法需要有关反应堆的几何布置和材料特性的详细信息，或者需要高水平的技术设备，如多光谱相机和偏振滤光片。在本文中，我们提出了一种不需要此信息和设备的方法。它使用简化的辐射模型和实验识别来确定高温物体（火焰）对反应堆每个壁段的影响。然后，所识别的模型可用于补偿反应堆正常运行期间的火焰反射。我们将演示使用中试规模电厂燃烧室的近红外图像序列的新方法。