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Tunable acousto-optic spectral imager for atmospheric composition measurements in the visible spectral domain

机译：可调谐声光光谱成像仪，用于可见光谱范围内的大气成分测量

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摘要

We describe a new spectral imaging instrument using a TeO_2 acousto-optical tunable filter (AOTF) operating in the visible domain (450-900 nm). It allows for fast (～1 second), monochromatic (FWHM ranges from 0.6 nm at 450 nm to 3.5 nm at 800 nm) picture acquisition with good spatial resolution. This instrument was designed as a breadboard of the visible channel of a new satellite-borne atmospheric limb spectral imager, named the Atmospheric Limb Tracker for the Investigation of the Upcoming Stratosphere (ALTIUS), that is currently being developed. We tested its remote sensing capabilities by observing the dense, turbulent plume exhausted by a waste incinerator stack at two wavelengths sensitive to NO_2. An average value of 6.0 ± 0.4 × 10~(17) molecules cm~(-2) has been obtained for the NO_2 slant column density within the plume, close to the stack outlet. Although this result was obtained with a rather low accuracy, it demonstrates the potential of spectral imaging by using AOTFs in remote sensing.
机译：我们描述了一种使用TeO_2声光可调滤光片（AOTF）在可见光域（450-900 nm）中运行的新型光谱成像仪器。它可以快速（〜1秒），单色（FWHM范围从450 nm的0.6 nm到800 nm的3.5 nm）获取具有良好空间分辨率的图像。该仪器被设计为一种新的由卫星传播的大气肢体光谱成像仪的可见通道的面包板，该成像仪名为“正在研究的即将到来的平流层的大气肢体追踪器”（ALTIUS），目前正在开发中。我们通过观察废物焚烧炉烟囱在对NO_2敏感的两个波长下排出的浓密湍流羽流，测试了其遥感能力。对于烟囱内靠近烟囱出口的NO_2倾斜柱密度，已获得6.0±0.4×10〜（17）分子cm〜（-2）分子的平均值。尽管获得的结果精度很低，但它证明了通过在遥感中使用AOTF进行光谱成像的潜力。

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