We showcase a Raman scattering diagnostic for 2D imaging of the rotational and vibrational temperatures of H. Applications include environments with vibrational-rotational non-equilibrium such as H-containing supersonic jets and plasma reactors. We image segments of the laser scattering spectrum, containing one or more Raman features, using an ICCD camera that is equipped with one of several bandpass filters. Knowing their transmission spectrum allows the construction of calibration curves that relate the relative intensities of the multi-spectral image to the rotational and vibrational temperatures. Additionally, the absolute intensity indicates the density of H. We illustrate the capability to independently measure rotational (300–3000 K, 150 K) and vibrational temperatures (1000–3000 K, 50 K). The technique is demonstrated on two different H microwave plasmas and validated against conventional fitting of 0D and 1D Raman spectra.

中文翻译：

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用于氢气中振动和旋转温度测绘的二维拉曼成像


我们展示了用于 H 旋转和振动温度二维成像的拉曼散射诊断。应用包括振动旋转非平衡环境，例如含 H 超音速射流和等离子体反应器。我们使用配备多个带通滤波器之一的 ICCD 相机对激光散射光谱的片段进行成像，其中包含一个或多个拉曼特征。了解它们的透射光谱可以构建校准曲线，将多光谱图像的相对强度与旋转和振动温度联系起来。此外，绝对强度表示 H 的密度。我们说明了独立测量旋转温度（300–3000 K、150 K）和振动温度（1000–3000 K、50 K）的能力。该技术在两种不同的 H 微波等离子体上进行了演示，并针对 0D 和 1D 拉曼光谱的传统拟合进行了验证。