Synchronous measurement of temperature and deformation at elevated temperatures based on the noncontact optical method can be achieved through the allocation of channels R, G, and B for a color camera. Channels R and G are used for the radiation-based temperature measurement, while channel B is adopted for the deformation measurement. However, the existence of color crosstalk, which is mainly caused by the color camera's spectral response and the use of the narrow-band filtering technique, has a significant influence on the accuracy of temperature and deformation calculations. In this work, the color crosstalk effect in high-temperature optical imaging is analyzed, and a crosstalk correction algorithm based on grayscale calibration is performed on the different color channels (channels R, G, and B) of the color image. By solving the calibration equations, three corrected color channels are generated for a high-precision temperature and deformation calculation. A flame heating experiment of a C/SiC material up to 1100 °C is carried out to validate the applicability accuracy of the proposed method. The results show that the proposed method can effectively eliminate the color crosstalk between different channels and provide a non-contact, full-field, and synchronous measurement of temperature and deformation with higher accuracy than the existing methods.

通过为彩色相机分配通道R、G和B，可以实现基于非接触式光学方法在高温下同步测量温度和变形。通道R和G用于基于辐射的温度测量，而通道B用于变形测量。然而，主要由彩色相机的光谱响应和窄带滤波技术的使用引起的颜色串扰的存在对温度和变形计算的准确性有显着影响。在这项工作中，在高温度的光学成像的彩色串扰的效果进行了分析，并在不同的颜色通道进行基于灰度校准的串扰校正算法（信道R，G，和乙) 的彩色图像。通过求解校准方程，生成三个校正后的颜色通道，用于高精度温度和变形计算。进行了高达 1100 °C 的 C/SiC 材料的火焰加热实验，以验证所提出方法的适用性准确性。结果表明，所提出的方法可以有效消除不同通道之间的颜色串扰，并提供比现有方法精度更高的非接触、全场、同步的温度和变形测量。