中国科学院机构知识库网格系统: 检索

基于多角度偏振成像仪数据的测试光源变化提取方法研究 期刊论文 OAI收割
光子学报, 2022, 卷号: 51
作者: 叶晨; 骆冬根; 李怡心; 姚萍萍; 王羿

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收藏 | 浏览/下载：18/0 | 提交时间：2023/11/10

Directional polarimetric camera Optical-electrical properties testing Wavelet decomposition Stability Trap detector Signal-to-noise ratio 多角度偏振成像仪光电性能测试小波分解稳定性陷阱探测器信噪比

Method to Improve the Detection Accuracy of Quadrant Detector Based on Neural Network 期刊论文 OAI收割
IEEE PHOTONICS TECHNOLOGY LETTERS, 2021, 卷号: 33, 期号: 22, 页码: 1254-1257
作者: Wang, Xuan; Su, Xiuqin; Liu, Guizhong; Han, Junfeng; Zhu, Wenhua

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收藏 | 浏览/下载：60/0 | 提交时间：2021/10/21

Detectors Laser beams Neural networks Surface treatment Position measurement Optical fiber amplifiers Training Free space optical communication (FSOC) quadrant detector (QD) neural network

Constraining the X-Ray-Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR 期刊论文 OAI收割
The Astrophysical Journal, 2020, 卷号: 901, 页码: L7
作者: HXMT

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收藏 | 浏览/下载：29/0 | 提交时间：2022/02/08

Radio transient sources Magnetars Soft gamma-ray repeaters 2008 992 1471 Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Instrumentation and Methods for Astrophysics Abstract: The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecond-duration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ?0.84 s with 99.9% observing efficiency. With a total observing time of ?12 hr (?47,728 images) during its 2020 outburst, we place median 3Ҡlimits on the second-timescale NIR fluence of ?18 Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is ?125 Jy ms for an estimated extinction of A_J = 2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at 10¹⁴ Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to R_NIR ? 0.025 (fluence index ?0.35).

Virtual dual-loop feedback control with model-construction linear extended state observer for free space optical communication 期刊论文 OAI收割
Sensors (Switzerland), 2019, 卷号: 19, 期号: 18
作者: Nie, Kang; Ren, Wei; Zhou, Xi; Mao, Yao

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收藏 | 浏览/下载：27/0 | 提交时间：2021/05/06

free space optical communication optoelectronic target detector model-construction linear extended state observer virtual dual-loop feedback control tip-tilt mirror disturbance suppression

Development of Titanium-Based Transition-Edge Single-Photon Detector 期刊论文 OAI收割
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 2019, 卷号: 29, 期号: 5, 页码: 5
作者: Zhang, Wen; Geng, Yue; Wang, Zheng; Zhong, Jia-Qiang; Li, Pei-Zhan

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收藏 | 浏览/下载：114/0 | 提交时间：2019/05/20

Superconducting transition-edge sensor single-photon detector response time quantum efficiency optical cavity

High-Precision Light Spot Position Detection in Low SNR Condition Based on Quadrant Detector 期刊论文 OAI收割
APPLIED SCIENCES-BASEL, 2019, 卷号: 9, 期号: 7
作者: Yu, Jiawei; Li, Qing; Li, Hongwei; Wang, Qiang

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收藏 | 浏览/下载：28/0 | 提交时间：2021/05/06

free space optical communication quadrant detector light spot detection Kalman filter real-time calculation

An improved method for the position detection of a quadrant detector for free space optical communication 期刊论文 OAI收割
Sensors (Switzerland), 2019, 卷号: 19, 期号: 1
作者: Li, Qing; Xu, Shaoxiong; Yu, Jiawei; Yan, Lingjie; Huang, Yongmei

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收藏 | 浏览/下载：72/0 | 提交时间：2021/05/06

free space optical communication quadrant detector light spot position detection cyclic cross-correlation

Improved measurement of beacon light angle deviation based on a quadrant detector 会议论文 OAI收割
Beijing, China, July 7, 2019 - July 9, 2019
作者: Li, Qing; Xu, Shaoxiong; Peng, Zhenming; Huang, Yongmei

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收藏 | 浏览/下载：30/0 | 提交时间：2021/05/06

Free space optical communication Quadrant detector Beacon angle deviation Fourier Transform

Small High-Resolution Angular Displacement Measurement Technology Based on Near-Field Image Acquisition 期刊论文 OAI收割
Ieee Sensors Journal, 2019, 卷号: 19, 期号: 15, 页码: 6141-6146
作者: X.D.Jia; Q.H.Wan; H.Yu; Y.Sun; C.H.Zhao

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收藏 | 浏览/下载：33/0 | 提交时间：2020/08/24

Subdivision,high precision,high resolution,angular displacement,measurement,image detector,optical encoder

Small-sized visual angular displacement measurement technology 期刊论文 OAI收割
Measurement, 2019, 卷号: 135, 页码: 406-412
作者: X.D.Jia; Q.H.Wan; H.Yu; X.R.Lu; C.H.Zhao

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收藏 | 浏览/下载：25/0 | 提交时间：2020/08/24

Image detector,Varying principle,High-precision,High-resolution,optical encoder,high-resolution,sensor,Engineering,Instruments & Instrumentation