多焦距微透镜阵列光场成像火焰三维温度场测量

Three-dimensional Temperature Measurement of the Flame Using the Light Field Camera With a Multiple Focus Microlens Array

多焦距微透镜阵列可提高聚焦光场相机的深度分辨率。为了研究多焦距微透镜阵列对光场成像火焰三维温度场测量的影响,本文在火焰辐射光场成像模型的基础上,分析了单焦距微透镜阵列和多焦距微透镜阵列的火焰辐射光场成像特征,计算了两种不同微透镜阵列下的火焰辐射图像,根据火焰光场图像重建了火焰的三维温度场。开展了多焦距微透镜阵列聚焦光场相机火焰三维温度场重建的实验研究,并对数值计算和实验结果进行了分析。

Multiple focus microlens array（MFMA） can improve the depth resolution of the focused light field camera. This paper investigates the effect of MFMA on the three-dimensional（3-D）temperature measurement of the flame. On the basis of light field imaging model of the flame,the light field imaging characters of flame radiation were analyzed for the MFMA and single focus microlens array（SFMA）. For the two different types of microlens array（MFMA and SFMA）, the light field images of the flame were numerically calculated. According to the light field images, the3-D temperature field of the flame was also reconstructed. Experiments were carried out on the 3-D temperature measurement of the flame using the light field camera with a MFMA. The simulation and experimental results were analyzed in detail.