Development of SHACS: Progress on Channel-1 Prototype Demonstrator
Development of SHACS: Progress on Channel-1 Prototype Demonstrator
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SHACS的开发：Channel-1原型演示器的进展
DOI：
10.1109/tgrs.2021.3116379
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发表时间：
2021
影响因子：
8.2
通讯作者：
C. Underwood
中科院分区：
文献类型：
--
作者：
Ikpaya O. Ikpaya;C. Underwood
近年来，人们越来越关注如何解决对气候变化的持续担忧，并致力于减轻其影响。卫星观测和地面网络在理解和管理这一问题方面发挥着关键作用。虽然光学检测二氧化碳（CO 2）相对简单，并且已经通过小型卫星实现，但CO 2的精确定量映射需要非常高的精度（~ 1ppm不确定度或更好）测量气体浓度。这通常是通过使用高分辨率光谱仪（例如，0.27 cm -¹分辨率，信噪比（SNR）为bbb300:1）通过1.56-1.62和1.92-2.06 μm波长的光谱吸收带来识别CO₂来实现的。这通常需要高性能、大型和复杂的仪器，这些仪器的高成本、质量、体积和功率要求使其无法在小型卫星上使用。本文介绍了紧凑型精密空间外差大气二氧化碳光谱仪（SHACS）的设计和开发进展，该光谱仪利用空间外差光谱（SHS）技术形成鲁棒、紧凑、无移动部分的傅里叶变换光谱（FTS）。本文还介绍了单通道（1.6 μm） SHACS仪器的研制阶段和地面大气CO₂测试情况。该仪器的光谱分辨率高达0.22 cm⁻¹，信噪比高达900:1，可安装在微型卫星平台上。凭借这种性能，实现了高质量的大气CO 2浓度测量，平均测量精度为1.27 ppm。
Finding solutions to the continuous concerns over climate change has been of increased interest in recent times with efforts targeted at mitigating its effects. Satellite observations and in situ terrestrial networks play key roles in the understanding and management of the problem. Whilst detecting carbon dioxide (CO₂) optically is relatively straightforward, and has been achieved with small satellites, accurate quantitative mapping of CO₂ requires very high precision (~1 ppm uncertainty or better) measurements of gas concentration. This is usually achieved through identifying CO₂ by its spectral absorption bands at 1.56-1.62 and 1.92-2.06 μm wavelength by using high-resolution spectrometers (e.g., 0.27 cm⁻¹ resolution at a signal-to-noise ratio (SNR) of >300:1). This normally requires high performance, large and complex instruments whose high cost, mass, volume, and power requirements preclude their use on small satellites. In this article, we describe the progress made in the design and development of a compact precision spatial heterodyne atmospheric carbon dioxide spectrometer (SHACS), which utilizes the spatial heterodyne spectroscopy (SHS) technique to form a robust, compact, no-moving-part Fourier transform spectroscopy (FTS). We also present the developmental stage and terrestrial atmospheric CO₂ testing of a single channel (1.6 μm) of SHACS instrument. This instrument achieves a high spectral resolution of 0.22 cm⁻¹ at a high SNR of >900:1 and can fit into a micro-satellite platform. With this performance, high-quality measurements of atmospheric CO₂ concentration with an average measurement precision of 1.27 ppm have been achieved.