The Atmospheric Chemistry Suite (ACS) package is an element of the Russian contribution to the ESA-Roscosmos ExoMars 2016 Trace Gas Orbiter (TGO) mission. ACS consists of three separate infrared spectrometers, sharing common mechanical, electrical, and thermal interfaces. This ensemble of spectrometers has been designed and developed in response to the Trace Gas Orbiter mission objectives that specifically address the requirement of high sensitivity instruments to enable the unambiguous detection of trace gases of potential geophysical or biological interest. For this reason, ACS embarks a set of instruments achieving simultaneously very high accuracy (ppt level), very high resolving power (>10,000) and large spectral coverage (0.7 to 17 μm—the visible to thermal infrared range). The near-infrared (NIR) channel is a versatile spectrometer covering the 0.7–1.6 μm spectral range with a resolving power of ∼20,000. NIR employs the combination of an echelle grating with an AOTF (Acousto-Optical Tunable Filter) as diffraction order selector. This channel will be mainly operated in solar occultation and nadir, and can also perform limb observations. The scientific goals of NIR are the measurements of water vapor, aerosols, and dayside or night side airglows. The mid-infrared (MIR) channel is a cross-dispersion echelle instrument dedicated to solar occultation measurements in the 2.2–4.4 μm range. MIR achieves a resolving power of >50,000. It has been designed to accomplish the most sensitive measurements ever of the trace gases present in the Martian atmosphere. The thermal-infrared channel (TIRVIM) is a 2-inch double pendulum Fourier-transform spectrometer encompassing the spectral range of 1.7–17 μm with apodized resolution varying from 0.2 to 1.3 cm−1. TIRVIM is primarily dedicated to profiling temperature from the surface up to ∼60 km and to monitor aerosol abundance in nadir. TIRVIM also has a limb and solar occultation capability. The technical concept of the instrument, its accommodation on the spacecraft, the optical designs as well as some of the calibrations, and the expected performances for its three channels are described.

中文翻译：

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用于 ExoMars 2016 痕量气体轨道飞行器的三个光谱仪的大气化学套件 (ACS)

大气化学套件 (ACS) 包是俄罗斯对 ESA-Roscosmos ExoMars 2016 痕量气体轨道飞行器 (TGO) 任务的贡献的一个元素。ACS 由三个独立的红外光谱仪组成，共享通用的机械、电气和热接口。这套光谱仪是为响应痕量气体轨道飞行器任务目标而设计和开发的，这些目标专门满足高灵敏度仪器的要求，能够明确检测具有潜在地球物理或生物价值的痕量气体。出于这个原因，ACS 推出了一套仪器，可同时实现非常高的精度（ppt 级）、非常高的分辨率（>10,000）和大光谱覆盖范围（0.7 到 17 微米——可见光到热红外范围）。近红外 (NIR) 通道是一种多功能光谱仪，覆盖 0.7-1.6 μm 光谱范围，分辨率为~20,000。NIR 采用阶梯光栅与 AOTF（声光可调谐滤波器）的组合作为衍射级选择器。该通道将主要在太阳掩星和天底运行，也可以进行临边观测。NIR 的科学目标是测量水蒸气、气溶胶以及白天或夜晚的气辉。中红外 (MIR) 通道是一种交叉色散中阶梯光栅仪器，专用于 2.2–4.4 μm 范围内的太阳掩星测量。MIR 实现了 >50,000 的分辨能力。它旨在完成火星大气中存在的痕量气体的最灵敏的测量。热红外通道 (TIRVIM) 是一个 2 英寸双摆傅立叶变换光谱仪，光谱范围为 1.7-17 μm，切趾分辨率从 0.2 到 1.3 cm-1。TIRVIM 主要致力于分析从地表到 60 公里范围内的温度并监测最低点的气溶胶丰度。TIRVIM 还具有边缘和太阳掩星能力。描述了该仪器的技术概念、它在航天器上的适应、光学设计以及一些校准，以及它的三个通道的预期性能。TIRVIM 还具有边缘和太阳掩星能力。描述了该仪器的技术概念、它在航天器上的适应、光学设计以及一些校准，以及它的三个通道的预期性能。TIRVIM 还具有边缘和太阳掩星能力。描述了该仪器的技术概念、它在航天器上的适应、光学设计以及一些校准，以及它的三个通道的预期性能。