Subjects: Geosciences >> Space Physics submitted time 2017-03-10
Abstract：为了满足大气微量成分高精度测量需求，要求准确描述星载高光谱大气微量成份探测仪的仪器狭缝函数，针对高光谱大气微量成份探测仪视场大、波段宽、空间分辨率和光谱分辨率高等特点，研制了狭缝函数测量仪。本文首先介绍了狭缝函数测量仪的工作原理，接着利用狭缝函数测量仪可同时实现高分辨率、宽谱段测量的特点，对高光谱大气微量成份探测仪进行全视场的狭缝函数测试，给出仪器狭缝函数特性分布，并对结果进行分析。测试结果表明：高光谱大气微量成份探测仪的狭缝函数特性曲线近似满足高斯分布规律，由于星载大视场成像光谱仪存在光谱弯曲现象，导致边缘视场分辨能力略低于中心视场分辨能力，高光谱大气微量成份探测仪全视场光谱分辨率优于0.6nm。
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2017-03-10
Abstract：光谱定标是仪器遥感数据定量化的前提和基础，针对星载大气微量成分探测仪视场大、波长 宽、空间分辨率和光谱分辨率高的特点，建立了基于中阶梯衍射光栅的光谱定标装置。中阶梯光栅 因其较少的线密度和较大的闪耀角工作在较高的闪耀级次，光谱范围宽且具有较高的分辨率，可在 工作波段内一次性输出多条分布较为均匀的谱线，克服了传统定标方式的缺点，提高了定标精度。 本文首先介绍了光谱定标装置的工作原理，接着利用该装置对高光谱大气微量成份探测仪进行光谱 定标，通过寻峰和回归分析给出载荷的光谱定标方程，并利用标准汞灯谱线对定标结果进行检验。 结果表明：高光谱大气微量成份探测仪的像元和波长近似满足线性分布规律，定标不确定度为 0.0258nm，汞灯特征谱线的定标值和标准值偏差最大不超过0.0435nm，证明了定标结果的准确性。
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2017-01-22
Abstract： As the thin air in the upper atmosphere(~250 km), passive optical measurement is considered as the most efficient method for wind retrieval of the upper atmosphere. Because of high energy utilization and high spectral resolution, Fabry-Perot Interferometer (FPI)is one of the most widely used instruments for wind measurements. To date, FPI has been used for wind measurements from both space and ground for decades. Many countries observed OI 630.0 nm nightglow emission to retrieve wind velocities by use of kinds of FPIs. In this paper, a tiny ground-based Fabry-Perot Interferometer (FPI) is designed using a band-pass filter behind etalon and Galilean telescope system for wind observation of the upper atmosphere. The instrument is mainly composed of five parts including front optics sky-scanner, the etalon, Galilean telescope and filter, detector, and laser calibration system. The size of the instrument is 1.34�.58�.35 m3, which demonstrates that the FPI is convenient to be transported from one place to another. Based on the instrument, several days of experiments were carried out at Langfang (39.40癗, 116.65癊) site and Kelan (38.71�N, 111.58�E) site for a detailed validation. The averaged wind deviation at Kelan sites between our FPI and American A-NCAR FPI is 11.8 m/s, which suggests good agreement between them.
Peer Review Status:Awaiting Review
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