Compressed sensing spectral imaging for plasma optical emission spectroscopy
Compressed sensing spectral imaging for plasma optical emission spectroscopy
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DOI：
10.1039/c6ja00261g
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发表时间：
2016-01-01
影响因子：
3.4
通讯作者：
Gamez, Gerardo
中科院分区：
文献类型：
--
作者：
Usala, John D.;Maag, Adrian;Gamez, Gerardo
等离子体光发射光谱成像对于化学分析应用和等离子体诊断的发展至关重要。然而，典型的技术需要阵列探测器，其可能非常昂贵，或者需要逐像素扫描的方法，这种方法非常耗时。此外，获取的图像文件被压缩以保持数据的可管理性，这可以在不损失关键信息的情况下实现，从而显示出数据的稀疏性。一种相当新的采样范式——压缩感知（CS），允许在采集过程中进行压缩，从而更有效地利用实验资源。因此，CS系统可以更快、更具成本效益，甚至提供更好的分辨率或通量。在这项研究中，设计并实现了一种具有单传感器和可变编码掩模的CS光谱成像系统，用于等离子体光发射光谱学。基于峰值信噪比（PSNR）和空间分辨率，其性能被表征为实验和图像处理参数的函数，例如传感矩阵的选择、恢复算法的选择以及稀疏化基。从大气压等离子体射流中收集了感兴趣的等离子体物质（He I、N₂、N₂⁺）的光发射光谱图像。首次报道了将CS光谱成像系统用于等离子体诊断（振动温度T - vib）。
Plasma optical emission spectral imaging is critical for the development of chemical analysis applications and plasma diagnostics. Nevertheless, typical techniques require array detectors that can be very expensive or pixel-to-pixel rastering approaches that are highly time-consuming. Further, the acquired image files are compressed to keep data manageable, which can be achieved without loss of critical information, thus showing the sparsity of the data. A fairly recent paradigm in sampling, compressed sensing (CS), allows performing compression during acquisition which results in a more efficient use of experimental resources. As such, CS systems can be much faster, cost-effective, or even provide better resolution or throughput. In this study, a CS spectral imaging system, featuring a single-sensor and a variable encoding mask, is designed and implemented for plasma optical emission spectroscopy. The performance, based on PSNR and spatial resolution, is characterized as a function of experimental and image processing parameters such as sensing matrix selection, recovery algorithm choice, and sparsifying basis. Spectral images of optical emissions from plasma species of interest (He I, N-2, N-2(+)) were collected from an atmospheric pressure plasma jet. The use of a CS spectral imaging system for plasma diagnostics (T-vib) is reported for the first time.