Demonstration o a cost-effective single-pixel UV camera for flame chemiluminescence imaging

Zhang Jiaqi; Wang Qian; Dai Jinghang; Cai Weiwei

摘要

Combustion is the dominant form of energy conversion for a span of power systems such as engines and power plant boilers. It is an extremely complicated process which produces a huge number of intermediate products that usually feature non-uniform spatial distributions. Among those intermediate products, free radicals emitting in the UV band are of special interest because they contain abundant useful information of the target flame. Imaging methods such as planar laser-induced fluorescence or chemiluminescence imaging with UV cameras are of paramount importance to resolve the non-uniformities for a better understanding of combustion. However, a major limitation of UV cameras is that they are usually expensive, especially when multiple cameras are needed, such as in a tomographic system. In this work, we report the attempt of flame imaging with a cost-effective single-pixel UV camera which enables 2D spatial resolution of a single-pixel detector through light modulation to overcome this limitation. Meanwhile, numerical studies were conducted to systematically assess the performance of a few representative reconstruction algorithms. The impact of important factors such as sampling ratio and measurement matrix were also investigated. A validation as well as a demonstrative experiment was also conducted to reconstruct a laminar diffusion flame. The high similarity between the reconstruction and the image taken by a CMOS camera proves the feasibility of flame imaging with a single-pixel camera. (C) 2019 Optical Society of America

机译：燃烧是用于发动机和电厂锅炉等电力系统跨度的能量转换的主要形式。这是一个非常复杂的过程，它产生了通常具有非均匀空间分布的大量中间产品。在那些中间产物中，在UV频段中发出的自由基具有特殊兴趣，因为它们包含了目标火焰的丰富有用信息。成像方法，例如平面激光诱导的荧光或化学发光成像与UV摄像机成像是至关重要的，以解决不均匀性以便更好地理解燃烧。然而，UV摄像机的主要限制是它们通常昂贵，特别是当需要多个摄像机时，例如在分层系统中。在这项工作中，我们报告了用经济效益的单像素UV摄像机进行火焰成像的尝试，这使得通过光调制使单像素检测器的2D空间分辨率能够克服这种限制。同时，进行了数值研究以系统地评估少数代表性重建算法的性能。还研究了重要因素的影响，例如取样比和测量基质。还进行了验证以及说明性实验以重建层层扩散火焰。 CMOS相机拍摄的重建和图像之间的高相似性证明了与单像素相机的火焰成像的可行性。（c）2019年光学学会

Demonstration o a cost-effective single-pixel UV camera for flame chemiluminescence imaging

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