Selecting the geology filter wavelengths for the ExoMars Panoramic Camera instrument
Selecting the geology filter wavelengths for the ExoMars Panoramic Camera instrument
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DOI：
10.1016/j.pss.2012.07.009
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发表时间：
2012-10-01
影响因子：
2.4
通讯作者：
Coates, Andrew J.
中科院分区：
文献类型：
--
作者：
Cousins, Claire R.;Gunn, Matthew;Coates, Andrew J.
全景照相机（PanCam）仪器将为ExoMars使命提供地面遥感数据。广角立体，多光谱和高分辨率图像的组合将产生背景地质信息，以帮助告知应选择哪些科学目标进行钻探和分析。PanCam数据集的一个组成部分是可见光到近红外的窄带多光谱成像，它利用一组专用的12个预定波长和带宽的“地质”滤波器来查看地形，并提供有关成分和推定矿物学的信息。这些滤波器的中心波长和带宽经过优化，以适应ExoMars漫游车有望遇到的高度多样化的矿物地形。创建了六个新的替代测试过滤器组，每个过滤器组都针对以下任一项进行了优化：硫酸盐、层状硅酸盐、氧化铁、镁铁质硅酸盐、铁吸附和轻微水合吸附。使用数据库矿物反射光谱和火星模拟岩石多光谱数据对这六套滤光片进行了交叉测试，以找到性能最佳的滤光片。一旦选定，该滤波器组的带宽也被优化。针对氧化铁矿物优化的滤波器组能够最准确地表示岩石多光谱数据，并捕获水合矿物（包括硫酸盐、层状硅酸盐和碳酸盐）的细微光谱特征。这些过滤器与过去任务中使用的过滤器不同（例如，探路者，火星探测漫游者），并代表下一个进化阶段的PanCam仪器的发展。与过去的滤光片相比，更新后的ExoMars滤光片更有效地捕捉岩石和矿物光谱数据，增强了ExoMars PanCam探测露头内岩性和成分变化的能力。(C)2012爱思唯尔有限公司保留所有权利。
The Panoramic Camera (PanCam) instrument will provide surface remote sensing data for the ExoMars mission. A combination of wide-angle stereo, multispectral, and high resolution imagery will generate contextual geological information to help inform which scientific targets should be selected for drilling and analysis. One component of the PanCam dataset is narrowband multispectral imaging in the visible to near infrared, which utilises a dedicated set of 12 "geology" filters of predetermined wavelength and bandwidth to view the terrain, and provide information on composition and putative mineralogy. The centre wavelengths and bandwidths of these filters were optimised to account for the highly diverse mineralogical terrains the ExoMars rover will hopefully encounter. Six new alternative test filter sets were created, each optimised for the detection of either: sulfates, phyllosilicates, ferric oxides, mafic silicates, iron absorptions, and minor hydration absorptions. These six filter sets were cross-tested using database mineral reflectance spectra and Mars analogue rock multispectral data to find the best performing filter set. Once selected, the bandwidths of this filter set were also optimised. The filter set optimised to ferric oxide minerals was able to most accurately represent rock multispectral data, as well as capture subtle spectral features of hydrated minerals, including sulfates, phyllosilicates, and carbonates. These filters differ from those used on past missions (e.g., Pathfinder, Mars Exploration Rover) and represent the next evolutionary stage in PanCam instrument development. When compared to past filter sets, the updated ExoMars filters capture rock and mineral spectral data more effectively, enhancing the ability of the ExoMars PanCam to detect lithological and compositional variation within an outcrop. (C) 2012 Elsevier Ltd. All rights reserved.