Results 21 to 30 of about 61,361 (287)

Highly Sensitive Sphere-Tube Coupled Photoacoustic Cell Suitable for Detection of a Variety of Trace Gases: NO₂ as an Example

Sensors, 2021
The concentration of trace gases in the atmospheric environment is extremely low, but it has a great impact on the living environment of organisms. Photoacoustic spectroscopy has attracted extensive attention in the field of trace gas detection because ...
Zhengang Li, Ganshang Si, Zhiqiang Ning, Jiaxiang Liu, Yonghua Fang, Beibei Si, Zhen Cheng, Changping Yang   +7 more
doaj   +1 more source

Parameter Optimization and Development of Mini Infrared Lidar for Atmospheric Three-Dimensional Detection

Sensors, 2023
In order to conduct more thorough research on the structural characteristics of the atmosphere and the distribution and transmission of atmospheric pollution, the use of remote sensing technology for multi-dimensional detection of the atmosphere is ...
Zhiqiang Kuang, Dong Liu, Decheng Wu, Zhenzhu Wang, Cheng Li, Qian Deng   +5 more
doaj   +1 more source

Scattering of Partially Coherent Vector Beams by a Deterministic Medium Having Parity-Time Symmetry

Photonics, 2022
We study the scattering properties of the partially coherent vector beams with the deterministic media having the classic symmetric and parity-time (PT) symmetric scattering potential functions.
Xuan Zhang, Yahong Chen, Fei Wang, Yangjian Cai   +3 more
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Study on Two-Dimensional Exit Pupil Expansion for Diffractive Waveguide Based on Holographic Volume Grating

Applied Sciences, 2023
Diffraction gratings are becoming a preferred option for waveguide head-mounted in–out coupling devices due to their flexible optical properties and small size and light weight.
Mianhui Weng, Yizhao Wang, Xuechang Ren, Qinghong Lu   +3 more
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A Mid-Infrared Quantum Cascade Laser Ultra-Sensitive Trace Formaldehyde Detection System Based on Improved Dual-Incidence Multipass Gas Cell

Sensors, 2023
Formaldehyde (HCHO) is a tracer of volatile organic compounds (VOCs), and its concentration has gradually decreased with the reduction in VOC emissions in recent years, which puts forward higher requirements for the detection of trace HCHO.
Tao Wu, Renzhi Hu, Pinhua Xie, Lijie Zhang, Changjin Hu, Xiaoyan Liu, Jiawei Wang, Liujun Zhong, Jinzhao Tong, Wenqing Liu   +9 more
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Simulation Analysis of a Wavefront Reconstruction of a Large Aperture Laser Beam

Sensors, 2023
In order to solve the problem of atmospheric influence on the far-field measurement of the quality of a laser beam, we proposed a direct wavefront measurement system based on the Hartmann detection principle, which can measure large apertures and high ...
Gangyu Wang, Zaihong Hou, Laian Qin, Xu Jing, Yi Wu   +4 more
doaj   +1 more source

Blind Restoration of Images Distorted by Atmospheric Turbulence Based on Deep Transfer Learning

Photonics, 2022
Removing space-time varying blur and geometric distortions simultaneously from an image is a challenging task. Recent methods (including physical-based methods or learning-based methods) commonly default the turbulence-degraded operator as a fixed ...
Yiming Guo, Xiaoqing Wu, Chun Qing, Changdong Su, Qike Yang, Zhiyuan Wang   +5 more
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Formation and Optical Properties of Ag Nanoparticles in CaB4O7–Ag2O and CaB4O7–Gd2O3–Ag2O Tetraborate Glasses [PDF]

Журнал нано- та електронної фізики, 2014
Formation of Ag nanoparticles (NPs) in the near-surface layer of CaB4O7–Ag2O and CaB4O7 –Gd2O3–Ag2O glasses by annealing in vacuum or in air is reported.
V.T. Adamiv, Ya.V. Burak, R.V. Gamernyk, R.M. Dutka, I.M. Teslyuk   +4 more
doaj  

Analysis and Correction of Smeared Image From Interline-Transfer CCD in Beam Quality Measurement

IEEE Photonics Journal, 2022
The smear effect caused by light penetration of interline-transfer (IT) CCD in beam quality measurement (BQM) is detrimental and not analyzed pertinently. This report proposes a mathematical model and a correction method for the smeared image.
Jie Luo, Laian Qin, Zaihong Hou, Wenyue Zhu, Feng He, Wenlu Guan, Yilun Cheng   +6 more
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Simulation of Compact Spaceborne Lidar with High-Repetition-Rate Laser for Cloud and Aerosol Detection under Different Atmospheric Conditions

Remote Sensing, 2023
To provide references for the design of the lab’s upcoming prototype of the compact spaceborne lidar with a high-repetition-rate laser (CSLHRL), in this paper, the detection signal of spaceborne lidar was simulated by the measured signal of ground-based ...
Jie Ji, Chenbo Xie, Kunming Xing, Bangxin Wang, Jianfeng Chen, Liangliang Cheng, Xu Deng   +6 more
doaj   +1 more source