Explanipedia

Continuous linearity evaluation of photodetectors using a cascaded integrating-sphere system Open

Wentao Wang, Jianjun Li, Peng Zou, Yinlin Yuan, Xiaobing Zheng · 2025

Traditional nonlinearity measurements are limited by the detector’s dynamic range, especially at extremely low light levels. We present a cascaded integrating-sphere system combined with an aperture tube, enabling continuous optical attenu…

Measurement method of the solar diffuser bidirectional reflectance distribution function in the short-wave infrared band Open

Zhiyuan Zhang, Hongyao Chen, Wenxin Huang, Xiaobing Zheng, Xiaolong Si , et al. · 2025

In the solar reflective band, the on-board calibration method based on a solar diffuser (SD) is the mainstream calibration method. However, the calibration accuracy is limited by the measurement accuracy of the SD bidirectional reflectance…

Study on the correction factors in detection efficiency measurements based on spontaneous parametric down-conversion Open

Zirui Jin, Binbin Yu, Junwei Chu, Jianjun Li, Xiaobing Zheng · 2025

This study discusses the correction factors in detection efficiency measurements based on spontaneous parametric down-conversion (SPDC) and coincidence counting. To address the coincidence loss induced by relative delays between two detect…

High-Precision 3D Mapping In Tunnels Based on Vibration Magnitude-Adaptive Kalman Filtering Open

Yaodong Song, Xiaobing Zheng, Ying Zhu · 2025

High and high gradient performance of the first medium-temperature baking 1.3 GHz cryomodule Open

Weimin Pan, Jiyuan Zhai, Feisi He, Rui Ge, Zhenghui Mi , et al. · 2024

The world’s first 1.3 GHz cryomodule containing eight 9-cell superconducting radio-frequency (rf) cavities treated by medium-temperature furnace baking (mid-T bake) was developed at the Institute of High Energy Physics, Chinese Academy of …

Recent advance progress of HL-3 experiments Open

X.R. Duan, M. Xu, W.L. Zhong, Xiao Ji, Wei Chen , et al. · 2024

Since the first plasma realized in 2020, a series of key systems on HL-3 (known as HL-2M before) tokamak have been equipped/upgraded, including in-vessel components (the first wall, lower divertor, and toroidal cryogenic/water-cooling/baki…

Wide Dynamic Range, High Uniformity Spectral Irradiance Source for Calibration of Scientific-Grade, Large-Size Space Detectors Open

Deyao Kong, Yinlin Yuan, Haitao Li, Wenchao Zhai, Xiaobing Zheng · 2024

In order to meet the high uniformity calibration requirements for scientific-grade, large-size space detectors used in the CHES Extrasolar Planet Exploration Mission, this paper presents the design of a wide dynamic range, high uniformity …

Detection efficiency measurement of an up-conversion single-photon detector at 3.39μm based on SPDC Open

Huili Wang, Renhui Chen, Pengju Zhang, Wenchao Zhai, Xiaobing Zheng , et al. · 2024

Up-conversion single-photon detector (UCSPD) is promising in weak light radiometry at mid-infrared spectrum. This paper proposed a method to measure the detection efficiency of UCSPD at 3.39μm based on the visible-infrared correlated photo…

A Wide-Angle Hyperspectral Top-of-Atmosphere Reflectance Model for the Libyan Desert Open

Fuxiang Guo, Xiaobing Zheng, Yanna Zhang, Wei Wei, Zejie Zhang , et al. · 2024

Reference targets with stability, uniformity, and known reflectance on the Earth’s surface, such as deserts, can be used for the absolute radiometric calibration of satellite sensors. A wide-angle hyperspectral reflectance model at the top…

Research on Algorithm for Extracting the Position of Tunnel Steel Arch Based on Lidar Point Cloud Open

Yaodong Song, Ying Zhu, Xiaobing Zheng, ChengXu Cao · 2024

Optical Design and Spectral Calibration of the Vis-Nir Irradiance Monitor Open

Xionghao Huang, Xiaobing Zheng, Junfeng Xie, Yang Pan, Ziju Huang , et al. · 2024

High Q and high gradient performance of the first medium-temperature baking 1.3 GHz cryomodule Open

Jiyuan Zhai, Weimin Pan, Feisi He, Rui Ge, Zhenghui Mi , et al. · 2023

World's first 1.3 GHz cryomodule containing eight 9-cell superconducting radio-frequency (RF) cavities treated by medium-temperature furnace baking (mid-T bake) was developed, assembled and tested at IHEP for the Dalian Advanced Light Sour…

Nonlinearity Measurement of Si Transferring Photodetector in the Low Radiation Flux Range Open

Yue Li, Zhen Liu, Yinlin Yuan, Wenchao Zhai, Peng Zou , et al. · 2023

In order to establish a transferring chain from a photon flux of a single-photon source in quantum radiometry, the nonlinearity of the photodetector needs to be accurately measured. Using the flux superposition method, a nonlinearity measu…

High Accuracy Solar Diffuser BRDF Measurement for On-Board Calibration in the Solar Reflective Band Open

Zhiyuan Zhang, Hongyao Chen, Wenxin Huang, Xiaobing Zheng, Liming Zhang · 2023

In the solar reflective band, an on-board calibration method based on a solar diffuser (SD) can realize full aperture, full field of view, and end-to-end absolute radiometric calibration of optical remote sensors. The SD’s bidirectional re…

Study of 256 fiber array biaxial LiDAR optical assembly measurements Open

Yingjie Ye, Maopeng Xia, Deyao Kong, Wenchao Zhai, Mingming Xu , et al. · 2023

This paper presents a method for measuring the optical assembly results based on multi-beam biaxial LiDAR. This method analyzes the optical assembly parameters of a LiDAR system affecting the LiDAR operation, and an experimental measuremen…

Nanodroplet‐Coated Microbubbles Used in Sonothrombolysis with Two‐Step Cavitation Strategy (Adv. Healthcare Mater. 6/2023) Open

Yunfan Pan, Yongjian Li, Yan Li, Xiaobing Zheng, Chenghong Zou , et al. · 2023

Microbubbles In article 2202281 by Jiang Li, Haosheng Chen, and co-workers, nanodroplet-coated microbubbles (NCMBs) are designed to realize a two-step cavitation strategy to accelerate thrombolysis. The first cavitation drives nanodroplets…

Cross-calibration method based on an automated observation site Open

Dong‐Liang Huang, Xin Li, Xiaobing Zheng, Wei Wei, Fuxiang Guo , et al. · 2023

Cross-calibration methods are widely used in high-precision remote sensor calibrations and ensure observational consistency between sensors. Because two sensors must be observed under the same or similar conditions, the cross-calibration f…

Parasitic modes suppression in CW cold tests of 1.3 GHz 9-cell high Q cavities at IHEP Open

Zhenghui Mi, Feisi He, Weimin Pan, Peng Sha, Jiyuan Zhai , et al. · 2021

The CW RF test of 1.3 GHz 9-cell cavity in liquid helium bath at 2 K is a very important key point in the cavity procurement. Some problems can be found through the test, according which to optimized and improve the process of cavity. Rece…

Analysis of the Spatial Properties of Correlated Photon in Collinear Phase-Matching Open

L. Yin, Jianjun Li, Wenchao Zhai, Maopeng Xia, Youbo Hu , et al. · 2021

In this paper, the spatial properties of correlated photon in collinear phase-matching in the process of spontaneous parametric down conversion (SPDC) are researched. Based on the study of the phase-matching angle, non-collinear angle, and…

Vicarious Radiometric Calibration of Ocean Color Bands for FY-3D/MERSI-II at Lake Qinghai, China Open

Shengli Chen, Xiaobing Zheng, Xin Li, Wei Wei, Shenda Du , et al. · 2020

To calibrate the low signal response of the ocean color (OC) bands and test the stability of the Fengyun-3D (FY-3D)/Medium Resolution Spectral Imager II (MERSI-II), an absolute radiometric calibration field test of FY-3D/MERSI-II at the La…

Medium-temperature furnace bake of Superconducting Radio-Frequency cavities at IHEP Open

Feisi He, Weimin Pan, Peng Sha, Jiyuan Zhai, Zhenghui Mi , et al. · 2020

Recently, heat treatment between 250 C and 500 C has been attempted to improve quality factor of superconducting radio-frequency cavities at FNAL and KEK. Experiments of such medium temperature (mid-T) bake with furnaces have also been car…

POLARIMETRIC CALIBRATION OF THE SPACEBORNE DIRECTIONAL POLARIMETRIC CAMERA INSTALLED ON THE GF-5 SATELLITE Open

Yi Yuan, Z. Liu, Xiaobing Zheng, Qi Kang, Huan Wu , et al. · 2020

The Spaceborne Directional Polarimetric Camera (SDPC) is dedicated to obtain an accurate information of clouds and microphysical properties of aerosol particles via multi-angle, multi-spectral and multi-polarization observations. It images…

Development of the Chinese Space-Based Radiometric Benchmark Mission LIBRA Open

Peng Zhang, Naimeng Lu, Chuanrong Li, Lei Ding, Xiaobing Zheng , et al. · 2020

Climate observations and their applications require measurements with high stability and low uncertainty in order to detect and assess climate variability and trends. The difficulty with space-based observations is that it is generally not…

SI Traceable Solar Spectral Irradiance Measurement Based on a Quantum Benchmark: A Prototype Design Open

Xiaobing Zheng, Maopeng Xia, Wenchao Zhai, Youbo Hu, Jianjun Li , et al. · 2020

We propose a space benchmark sensor with onboard SI (Système International) traceability by means of quantum optical radiometry. Correlated photon pairs generated by spontaneous parametric down-conversion (SPDC) in nonlinear crystals are u…

Introduction of the radiometric benchmark satellite being developed in China for remote sensing Open

Naimeng Lu, Lei DING, Xiaobing Zheng, Xin Ye, Chuanrong LI , et al. · 2020

Investigation on hydrodynamic lubrication of bearings in a left ventricular assisted device Open

Xiaobing Zheng, Yongjian Li, Haosheng Chen, Shengshou Hu, Jianye Zhou · 2019

Formations of clots were found inside the hydrodynamic bearings of the left ventricular assisted devices (LVADs) and caused tremendous risks to the long-term use of these devices. For the hydrodynamic bearings used in the LVAD, not only th…

Design and Simulation of Trajectory Tracking Guidance Law Based on LQR for Target Missile Open

Xiaobing Zheng, Shuying Yang, K Q Zhang · 2018

Aiming at the trajectory tracking problem of the target projectile, a ballistic tracking guidance law of the target projectile is designed based on the linear quadratic regulator (LQR) theory. Using time as an independent variable, the mot…

Effect of divergence angle of polarization calibration source on DPC polarization calibration: Analysis and validation Open

Qing Kang, Yinlin Yuan, Jianjun Li, Wenchao Zhai, Haoyu Wu , et al. · 2018

Absolute calibration of the InSb analog detector based on parametric-down-conversion Open

Maopeng Xia, Jianjun Li, Youbo Hu, Wenyang Sheng Wenyang Sheng, Dongyang Gao , et al. · 2015

Currently the two major generally radiometric calibration methods including standard radiometric source and detectors are realized by standard transfer, but it is difficult to overcome the cumulative error during its calibration processes.…

Novel calibration optical path of cryogenic radiometer Open

Weiwei Pang Weiwei Pang, Xiaobing Zheng, Jianjun Li Jianjun Li, Xueshun Shi, Haoyu Wu , et al. · 2015

We introduce a novel calibration optical path of the cryogenic radiometer, which can avoid the repeated dismounting measurement and eliminate the negative influence of Brewster window effect on calibration result. The novel calibration opt…

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