Semantic Ambient Media Experiences最新文献_第3页

Design of a temperature compensation birefringent filter based on thermo-optic effect for space solar exploration 基于热光效应的空间太阳探测用温度补偿双折射滤光片设计

Semantic Ambient Media Experiences Pub Date : 2023-05-24 DOI: 10.1117/12.2682975

Jie Zhao, Huili Yi, Zixuan Yang, Chengchao Liu

引用次数: 0

Detection of sensible heat flux in atmospheric turbulence by laser speckle imaging based on a cooperative target 基于协同目标的激光散斑成像探测大气湍流感热通量

Semantic Ambient Media Experiences Pub Date : 2023-05-24 DOI: 10.1117/12.2683108

Junxin Zhang, Haiping Mei, R. Rao

{"title":"Detection of sensible heat flux in atmospheric turbulence by laser speckle imaging based on a cooperative target","authors":"Junxin Zhang, Haiping Mei, R. Rao","doi":"10.1117/12.2683108","DOIUrl":"https://doi.org/10.1117/12.2683108","url":null,"abstract":"Sensible heat flux (H) is an important physical quantity to characterize the turbulent energy transport in the near-surface atmosphere, which is benefit for understanding the spread and diffusion of urban atmospheric pollutants and weather changes. Referring to the principle of the large aperture scintillometer (LAS) to obtain H, we propose a method for detecting H by using laser speckle imaging (LSI) system based on a cooperative target. The experiment system used 3M microcrystalline reflective film to effectively reduce the requirement of laser power. Besides, it could overcome the limitation of the complex terrain of the test field, such as islands and hills where the transportation and electricity supply are not convenient. The refractive index structure parameter 2 Cn , which is required to calculate the H, inversion from image scintillation method and centroid drift method are compared to the 2 Cn inversion by coherence length meter. The comparison results show that 2 Cn obtained by the image scintillation method are not reasonable, while the results obtained by the centroid drift method are in good agreement with the coherence length meter, especially under the circumstances of laser beam near collimation.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"59 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133511678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low-noise Si transferring detector for correlated photon absolute source 相关光子绝对源低噪声Si传递探测器

Semantic Ambient Media Experiences Pub Date : 2023-05-24 DOI: 10.1117/12.2682611

Yue Li, Wenchao Zhai, Yinlin Yuan, Yadong Hu, Xiaobing Zheng

{"title":"Low-noise Si transferring detector for correlated photon absolute source","authors":"Yue Li, Wenchao Zhai, Yinlin Yuan, Yadong Hu, Xiaobing Zheng","doi":"10.1117/12.2682611","DOIUrl":"https://doi.org/10.1117/12.2682611","url":null,"abstract":"The space radiometric benchmark enables in-orbit traceable to SI system, calibrates in-orbit loads, improves data consistency across different space radiometric remote sensing missions, and facilitates long-term high-precision monitoring of global climate and environment. The transferring detector becomes an absolute power detector by quantum optical radiation measurement in the self-calibration mode, and is used to measure solar radiation in the observation mode. Si photodiode is used as transferring detector in the visible band, which requires high-precision radiometric detection at the photon level. Therefore, Si photodiode and its amplifying circuit need to have low noise. To expand the detection dynamic range of Si photodiode under low radiation condition, the noise sources of Si photodiode and its amplifier circuit are analyzed, and cooling of Si photodiode is proposed to reduce the noise. Vacuum cryogenic experiment was conducted to study the temperature characteristics of Si photodiode at 223K to 263K, and the temperature control design requirements were obtained. A sealed package Si photodiode based on two-stages TEC was developed, and a high-precision temperature control circuit with -40 °C ± 0.01 °C was designed. The shunt resistance of the cooled Si photodiode at -40°C was tested to be 8.5 TΩ, and the dark current was 1.2 fA. A wide dynamic range low-light-level irradiance source with adjustable radiation intensity is used to test the cooled Si photodiode with a low-noise transimpedance amplifier, the measurement signal-to-noise ratio was 1158 when the photocurrent was about 1pA.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123782657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement and study of daytime optical turbulence and precipitable water vapor in the northwestern area of China 西北地区日间光学湍流和可降水量的测量与研究

Semantic Ambient Media Experiences Pub Date : 2023-05-24 DOI: 10.1117/12.2681794

Han Zhang, Gan Sun, Xuebin Li, Liming Zhu, Kaixuan Yang, Ying Liu, Xuefeng Duan, Shengcheng Cui, N. Weng

引用次数: 0

Fast detection method of calibrator spaceborne sun glint based on FPGA 基于FPGA的校准器星载太阳闪烁快速检测方法

Semantic Ambient Media Experiences Pub Date : 2023-05-24 DOI: 10.1117/12.2681857

Yuhao Li, F. Ji, Yadong Hu, Gaojun Chi, Zhenwei Qiu, Zhuoran Li, Feinan Chen

{"title":"Fast detection method of calibrator spaceborne sun glint based on FPGA","authors":"Yuhao Li, F. Ji, Yadong Hu, Gaojun Chi, Zhenwei Qiu, Zhuoran Li, Feinan Chen","doi":"10.1117/12.2681857","DOIUrl":"https://doi.org/10.1117/12.2681857","url":null,"abstract":"Sun glint is a serious obstacle to passive optical remote sensing images. As is the specular reflection of sunlight from the facets of the water surface, sun glint has great linear polarization characteristics, and it is usually suppressed by adding polarizers. Therefore, a spaceborne sun glint polarization parameter measurement system is developed to calculate the on-orbit sun glint parameters in real time. Firstly, we analyzed the polarizing radiation distribution model of sun glint and developed a real time detection system for polarization angle of sun glint according to the principle of spaceborne polarization imager. The system is using Xilinx V5 FPGA as the on-the-satellite processing platform, and we use high-level synthesis (HLS) tools for algorithm hardware description development. By using dataflow, pipeline and other optimization methods in HLS, we greatly reducing computing time and reducing the FPGA resource use. Finally, we use it to calculate the sun glint polarization angle through a three-channel data with a granularity of 25×25 in 670nm, the simulation results show that under the 100M clock, 54% of the slice and DSP48 FPGA resources are consumed, and the sun glint polarization angle can be calculated in 8ms time, which meets the design requirements of rapid sun glint detection.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"12706 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130663290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Methane leakage monitoring system based on light-induced thermoelastic spectroscopy 基于光致热弹性光谱的甲烷泄漏监测系统

Semantic Ambient Media Experiences Pub Date : 2023-05-24 DOI: 10.1117/12.2681796

Qinduan Zhang, Guancheng Liu, Binkai Li, Yubin Wei, Tingting Zhang, Zhaowei Wang, Weihua Gong, Tong-yu Liu

引用次数: 0

The research progress in underwater wireless optical communication technology 水下无线光通信技术的研究进展

Semantic Ambient Media Experiences Pub Date : 2023-05-24 DOI: 10.1117/12.2682867

Peng Li, Xiaotian Han, Wenchao Nie, Chang Chang, Guangying Li, Peixuan Liao, Wen Wang

引用次数: 0

Antenna efficiency and aperture optimization analysis of spaceborne coherent wind lidar 星载相干风激光雷达天线效率及孔径优化分析

Semantic Ambient Media Experiences Pub Date : 2023-05-24 DOI: 10.1117/12.2681978

Zhen Liu, D. Bi, Weibiao Chen, Jiqiao Liu, Xiaopeng Zhu

引用次数: 0

Stray light simulation and suppression of high-resolution simultaneous polarization imager 高分辨率同步偏振成像仪杂散光模拟与抑制

Semantic Ambient Media Experiences Pub Date : 2023-05-24 DOI: 10.1117/12.2683096

Xinxin Zhao, Maoxin Song, Mingchun Ling, Yuheng Chu, Dapeng Kuang, Jin Hong

{"title":"Stray light simulation and suppression of high-resolution simultaneous polarization imager","authors":"Xinxin Zhao, Maoxin Song, Mingchun Ling, Yuheng Chu, Dapeng Kuang, Jin Hong","doi":"10.1117/12.2683096","DOIUrl":"https://doi.org/10.1117/12.2683096","url":null,"abstract":"A high-resolution simultaneous polarization imager based on off-axis three-mirror telescopic objective detects polarization information to enhance contrast and identify target. Stray light can increase system noise, reduce image contrast, and affect imaging quality. It is necessary to analyze and suppress stray light in order to ensure the polarization measurement accuracy of the instrument. The three-dimensional solid model and optical properties of the instrument were established by stray light analysis software Tracepro. The stray light of channel 1 was simulated and analyzed. The important surface of the system and the first-order stray light paths were found through forward trace and backward trace. The main baffle and vane, secondary mirror baffle and third mirror light barrier were designed by using CAD drawing software. Then the PST (Point Source Transmittance) curve of stray light is given under off-axis angle is within ± 50 °. When the off-axis angle is  30 °, PST is less than 10-10. The VGI (Veiling Glare Index) is 1.47%, which was obtained by fitting the PST curve and integrating. The influence of the VGI on the polarization accuracy was 0.020@p=0.3. The results show that the stray light suppression system have obvious effects, and the influence on the polarization accuracy is acceptable.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126267112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantitative analysis of Cr in soil using laser induced breakdown spectroscopy combined with relevance vector machine method 激光诱导击穿光谱结合相关向量机方法定量分析土壤中铬

Semantic Ambient Media Experiences Pub Date : 2023-05-24 DOI: 10.1117/12.2681893

Mengjie Lu, Weidong Zhou

引用次数: 0