Search

Your search keyword '"Xu, Xuesen"' showing total 14 results
Start Over Author "Xu, Xuesen"
14 results on '"Xu, Xuesen"'

5. Investigation into the Affect of Chemometrics and Spectral Data Preprocessing Approaches upon Laser-Induced Breakdown Spectroscopy Quantification Accuracy Based on MarSCoDe Laboratory Model and MarSDEEP Equipment.

Author

Liu, Ziyi, Li, Luning, Xu, Weiming, Xu, Xuesen, Cui, Zhicheng, Jia, Liangchen, Lv, Wenhao, Shen, Zhihui, and Shu, Rong

Subjects
CHEMOMETRICS, MARTIAN atmosphere, MARTIAN surface, LASER-induced breakdown spectroscopy, AMBIENCE (Environment), SURFACES (Technology)
Abstract

As part of China's Tianwen-1 Mars mission, the Mars Surface Composition Detector (MarSCoDe) instrument on the Zhurong rover adopts laser-induced breakdown spectroscopy (LIBS) to perform chemical component detection of the materials on the Martian surface. However, it has always been a challenging issue to achieve high accuracy in LIBS quantification. This study investigated the effect of chemometrics and spectral data preprocessing approaches on LIBS quantification accuracy based on different chemometrics algorithms and diverse preprocessing methods. A total of 2340 LIBS spectra were collected from 39 kinds of geochemical samples by a laboratory duplicate model of the MarSCoDe instrument. The samples and the MarSCoDe laboratory model were placed in a simulated Martian atmosphere environment based on equipment called the Mars-Simulated Detection Environment Experiment Platform (MarSDEEP). To quantify the concentration of MgO in the samples, we employed two common LIBS chemometrics; i.e., partial least squares (PLS) and a back-propagation neural network (BPNN). Meanwhile, in addition to necessary routine preprocessing such as dark subtraction, we used five specific preprocessing approaches, namely intensity normalization, baseline removal, Mg-peak wavelength correction, Mg-peak feature engineering, and concentration range reduction. The results indicated that the performance of the BPNN was better than that of the PLS and that the preprocessing of Mg-peak wavelength correction had the most prominent effect to improve the quantification accuracy. The results of this study are expected to provide inspiration for the processing and analysis of the in situ LIBS data acquired by MarSCoDe on Mars. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

7. Initial In-Flight Spectral Calibration of the Near-Infrared Spectra Acquired by the MarSCoDe Onboard the Zhurong Rover

Author

Wu, Bing, primary, Liu, Chengyu, additional, Xu, Rui, additional, Lin, Honglei, additional, Xu, Xuesen, additional, Yan, Wei, additional, Tan, Yongjian, additional, Liu, Bin, additional, Ren, Xin, additional, Xu, Weiming, additional, Liu, Xiangfeng, additional, Zhang, Zhenqiang, additional, Yang, Benyong, additional, He, Zhiping, additional, and Shu, Rong, additional

Published
2022
Full Text
View/download PDF

12. Photometric Correction of Chang’E-1 Interference Imaging Spectrometer’s (IIM) Limited Observing Geometries data with Hapke Model

Author

Xu, Xuesen, Liu, Jianjun, Liu, Dawei, Liu, Bin, and Shu, Rong

Subjects
atmospheric_science
Abstract

The main objective of this study is to develop a Hapke photometric model that is suited for Chang’E-1 (CE-1) Interference Imaging Spectrometer (IIM) data. We first divided the moon into three areas including ‘maria’, ‘new highland’ and old ‘highland’ with similar photometry characteristic based on the Hapke parameters of the moon derived from Lunar Reconnaissance Orbiter Camera (LROC) Wide Angle Camera (WAC) multispectral data. Then, we selected the sample data in the ‘maria’ area and obtained a new set of Hapke model’s parameters that can best fit these data. Result shows that photometric correction using Hapke model with these new derived parameters can eliminate the effect of variations in viewing and luminating geometry, especially ‘opposition surge’, more efficiently than the empirical model. The corrected mosaic shows no significant artifacts along the tile boundaries, and more detailed information of the image can be exhibited due to a better correction of ‘opposition surge’ at small phase angle (g

Published
2020

14. Efficient broadband NIR emission of Yb3+-activated double-perovskite tungstate Ba0.5MgLaWO6☆

Author

Xu, Xuesen, Tong, Tangying, Luo, Shijia, Cai, Peiqing, Wang, Guanghua, Zhang, Xiaodan, Zhang, Jie, and Liu, Zugang

Abstract

Broad-band near-infrared (NIR) phosphors have garnered increasing attention due to the versatile applications in spectroscopy technology fields, but the choice of efficient NIR phosphors remains a challenge. Here, Yb3+-activated cubic double-perovskite tungstate Ba0.5MgLaWO6was synthesized using a solid-state reaction method. A broadband NIR emission (800–1150 nm) is observed from the 2F5/2→2F7/2transition of Yb3+activators in Ba0.5MgLaWO6under the excitation by UV and near-UV light. Photoluminescence (PL) spectra, decay and emission lifetimes, concentration-dependent intensities, and low temperature luminescence of Yb3+-activated Ba0.5MgLaWO6were investigated to study the energy transfer (ET) from isolated WO6polyhedra to Yb3+activators. The main luminous mechanism involves cooperative energy transfer (CET), wherein, one high-energy excitation photon absorbed by host WO6group converts to two NIR photons emitted by Yb3+. The partial substitution of Mo6+for W6+in Ba0.5MgLaWO6further leads to a significant increase of the intensity and lifetime of the NIR luminescence. This work provides a feasible strategy for developing a new Yb3+-doped perovskite tungstate, which demonstrates efficient wavelength down-conversion from UV and near-UV to NIR. This material could find versatile applications as an effective NIR luminescent candidate.

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results