Dekemper Emmanuel, Loodts Nicolas, Van Opstal Bert, Maes Jeroen, Vanhellemont Filip, Mateshvili Nina, Franssens Ghislain, Pieroux Didier, Bingen Christine, Robert Charles, De Vos Lieve, Aballea Ludovic, Fussen Didier
Belgian Institute for Space Aeronomy (BIRA-IASB), 3 avenue Circulaire, 1180 Brussels, Belgium.
Appl Opt. 2012 Sep 1;51(25):6259-67. doi: 10.1364/AO.51.006259.
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.
我们描述了一种新型光谱成像仪器，它使用在可见光域（450 - 900 nm）工作的TeO₂ 声光可调滤光器（AOTF）。该仪器能够实现快速（约1秒）、单色（半高宽范围从450 nm处的0.6 nm到800 nm处的3.5 nm）图像采集，且具有良好的空间分辨率。此仪器被设计为一种新的星载大气边缘光谱成像仪可见光通道的实验模型，该成像仪名为用于研究即将到来的平流层的大气边缘跟踪仪（ALTIUS），目前正在研发中。我们通过在对NO₂ 敏感的两个波长下观测垃圾焚烧炉烟囱排放的浓密、湍流羽流，测试了其遥感能力。在靠近烟囱出口处的羽流内，NO₂ 斜柱密度的平均值为6.0±0.4×10¹⁷ 分子·cm⁻² 。尽管该结果的精度相当低，但它展示了在遥感中使用AOTF进行光谱成像的潜力。
