Semantic Ambient Media Experiences最新文献

{"title":"Simulation of power-modulation mid-infrared integrated-path differential absorption lidar for probing benzene concentration","authors":"Jiahui Liu, Shichun Li, Mingxuan Duan, Yingchun Gao, W. Xin, Dengxin Hua","doi":"10.1117/12.2683026","DOIUrl":"https://doi.org/10.1117/12.2683026","url":null,"abstract":"Aiming at the detection of benzene concentration in the atmosphere, a power-modulation scheme with laser wavenumber tuning is proposed in mid-infrared integrated-path differential absorption (IPDA) lidar. Based on the differential absorption lidar (DIAL) theory, we design the configuration of power-modulation IPDA lidar. Its central measurement and reference wavenumber are selected as 3090.3cm-1 and 3137.7cm-1, and the power-modulation scheme of IPDA lidar is proposed through interband cascade laser (ICL) current-driving characteristic. The simulation model of power-modulation mid-infrared IPDA lidar is constructed, and then its theoretical analysis is carried out. Furthermore, the retrieval algorithm for benzene concentration is presented, and then the concentration precision as 1/f noise with different frequencies is analyzed with FFT retrievals of 1000. The detection performance of lidar such as signal-to-noise ratio (SNR) and relative error for path length and visibility is compared between direct current (DC) driving and altering current (AC) driving, i.e. power-modulation scheme. The results show that the uncertainty of concentration is consistent with the effect of 1/f noise, that the SNR increases with the increase of visibility or the decrease of path length and the relative error decreases with the increase of visibility or the decrease of path length, and that the SNR will increase with the increase in frequency, and the relative error will decrease under the same path length and visibility. Therefore, the power-modulation mid-infrared IPDA lidar can be more effective for probing benzene concentration.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"11 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":"131166364","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}

{"title":"The method of retrieving aerosol extinction coefficient by ultraviolet lidar","authors":"Hui Zhang, H. Shan, Xiaomin Ma, Kai-fa Cao, Shenhao Wang, Shaoqing Zhao, Changjiang Zhang, Z. Tao","doi":"10.1117/12.2683120","DOIUrl":"https://doi.org/10.1117/12.2683120","url":null,"abstract":"Aerosol is the main component of air pollutants. Lidar is a powerful tool to detect atmospheric aerosols. 355 nm in ultraviolet, visible spectrum and 1064 nm in near infrared are commonly used in detection, while the ultraviolet spectrum with wavelength less than 320 nm is less used. The main reason is that ozone has a certain content in the atmosphere and is strongly absorbed in the ultraviolet spectrum. Retrieving aerosol extinction coefficient from ultraviolet lidar equation is more complex than from 355 nm, visible spectrum and 1064 nm lidar equation because of the interaction of aerosol absorption, ozone absorption and atmospheric molecular absorption.The method of detecting aerosol extinction coefficient is proposed by emitting two ultraviolet lasers into the atmosphere at the same time. An iterative inversion method is designed to retrieve the aerosol extinction coefficient profile from two ultraviolet lidar equations with the ozone concentration profile as the constraint condition. In order to verify the correctness of the inversion method, the test is arranged by simulation signal.Two simulation ultraviolet lidar signals are obtained from supposed aerosol extinction coefficient and ozone concentration profiles, then, the aerosol extinction coefficient profiles in the ultraviolet spectrum are retrieved from the simulated signals by the inversion method. The results indicate that the inversion method is feasible and reliable.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"11 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":"127501831","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}

{"title":"A method for predicting aerosol optical thickness based on kernel principal component analysis using geographically and temporally weighted regression model","authors":"Yue Wang, Hanhan Ye, Xianhua Wang, Hailiang Shi, Xiong Wei, Chao Li, Erchang Sun, Yuan An, Kunzhu Xiang","doi":"10.1117/12.2682060","DOIUrl":"https://doi.org/10.1117/12.2682060","url":null,"abstract":"The spatial and temporal distribution of atmospheric aerosols closely affects climate change, air quality, environmental pollution and human health. Exploring and predicting the spatial and temporal characteristics of regional atmospheric aerosols is beneficial to the monitoring and assessment of regional atmospheric environmental quality. Taking the Qinghai-Tibet Plateau and its surrounding areas as an example, this study considers the spatial and temporal non- stationarity of aerosol optical thickness (AOD) and its multiple driving factors, and proposes a geographically and temporally weighted regression method based on kernel principal component analysis (KPCA-GTWR) is proposed. The method eliminates the multicollinearity among the driving factors after the multicollinearity test, extracts the principal components with a cumulative contribution rate greater than 95% as the input of GTWR, and improves the prediction accuracy of GTWR. Finally, the method compared with the prediction results of the conventional VIF-GTWR method and PCA-GTWR method. The results found that (1) there are correlations between AOD and its multiple drivers, as well as linear and nonlinear correlations between the drivers. (2) In comparison, the KPCA-GTWR method has the highest prediction accuracy. Compared with the conventional VIF-GTWR and PCA-GTWR methods, the predicted AOD with MERRA-2 AOD 10-fold cross validated R 2 improved from 0.764, 0.861 to 0.914 , RMSE decreased from 0.059, 0.05 to 0.044 , and MAE decreased from 0.043, 0.037 to 0.033, respectively. (3) Comparing the results in June, July, August in 2020, the spatial distribution of AOD and MERRA-2 AOD predicted using this method in and around the Tibetan Plateau is consistent and shows large spatial differences. The low values of both predicted AOD and MERRA-2 AOD are located in the main part of the Tibetan Plateau, around 0.25 or less, while the high values are found in the Tarim Basin, the Ganges Basin of India and the Sichuan Basin, up to 0.75 or more.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"20 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":"126362952","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}

{"title":"Analysis of the optimal detection spectrum of air targets based on MODIS data","authors":"Youkun Zhang, Hongxia Mao, Zheng Liu","doi":"10.1117/12.2682711","DOIUrl":"https://doi.org/10.1117/12.2682711","url":null,"abstract":"In point target optical detection, the selection of the detection spectrum largely determines the upper limit of detection capability. In this paper, we analyze the main factors affecting point target detection and propose a spectral segment selection method for point target detection based on constant false alarm. The method uses the probability of detection as an evaluation index and considers the target and background radiation properties, atmospheric radiative transfer, background clutter and sensor noise levels. The method can calculate the optimal spectral band for its detection for different cases of target and background information. In this paper, we analyze the clutter levels of different surface types of background using MODIS data, and take typical airborne target detection as an example. We calculate the range of spectral bands whose detection probabilities meet the requirements under several conditions to verify its feasibility. The results show that the point target detection spectra satisfying the false alarm rate and detection probability requirements can be obtained by the method in this paper","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"28 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":"124587207","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}

{"title":"Scintillation index based on modified Bessel beam in ocean turbulence","authors":"Luxin Diao, Mingjun Wang, Yue Peng","doi":"10.1117/12.2682205","DOIUrl":"https://doi.org/10.1117/12.2682205","url":null,"abstract":"Turbulence effect is one of the key factors limiting underwater optical transmission communication. Eddy light underwater transmission can provide a new way to realize ultra-wideband and high speed underwater optical information transmission. This paper studies the scintillation index of the modified Bessel Gaussian beam propagating in ocean turbulence, analyzes the influence of wave source parameters and ocean turbulence parameters on the propagation quality of the modified Bessel Gaussian beam, and studies the transmission characteristics of the modified Bessel Gaussian beam propagating in underwater turbulence by designing experiments. The influence of turbulent flow induced by water diffusion with different temperature and salinity differences on beam propagation is considered. The theoretical and experimental results show that smaller width parameters will reduce the scintillation index of the beam under the same ocean turbulence environment. In the selection of ocean turbulence parameters, the larger turbulent kinetic energy dissipation rates and the smaller temperature salinity fluctuation equilibrium parameters can also effectively improve the beam transmission performance, and the scintillation index increases with the increase of turbulence intensity. The research results of this paper have important reference value for the research of vortex light transmission and communication","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"18 2 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":"131003600","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}

{"title":"Time of flight LIDAR ranging and error analysis under smog conditions","authors":"Hao Lin, Lin Gui, Lianzhou Wang, Hao-nan Xing, Pan Dai, Zhuo Chen","doi":"10.1117/12.2683113","DOIUrl":"https://doi.org/10.1117/12.2683113","url":null,"abstract":"Time of flight light detection and ranging (TOF LiDAR) is the main detection technology solution used in the mainstream LiDAR products at present. Smog has a certain interference effect on the laser, which affects the ranging accuracy of TOF LiDAR system. This paper focuses on the accuracy of TOF LiDAR ranging under smog conditions and the error analysis. A vertical cavity surface emitting laser is selected to emit a pulsed laser through a smog-filled smog chamber, a CMOS sensor is used to receive the reflected light, and the experimental data are collected using the host computer software. The collected data are then extracted from the effective area and processed with algorithms such as average filtering. Finally, the image of each pixel with the measured distance and the error situation are obtained. The effect of smog is simulated by increasing the system delay time to obtain the simulated image under smog conditions. The results obtained from the TOF LiDAR smog experiment are compared with the simulation results, and it can be seen that the smog has a significant attenuation effect on the laser transmission, with the attenuation ratio up to 63.99%, and the range error under the smog condition decreases by 53.55%, and the accuracy of the range measurement is improved.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"125 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":"132480663","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}

{"title":"Air microfluidic chip design for atmospheric particulate matter detection","authors":"Ruofei Wang, Heng Zhao, Xingbo Wang, Jiaqi Li","doi":"10.1117/12.2681799","DOIUrl":"https://doi.org/10.1117/12.2681799","url":null,"abstract":"In recent years, studies on fine particulate matter have shown that high concentrations of particulate matter seriously affect the quality of weather, creating a series of severe weather such as haze and posing a great risk to human health. The results of epidemiological studies suggest that particulate matter is associated with a higher risk of cardiopulmonary mortality and morbidity. Therefore, there is an urgent need to conduct research on particulate matter to solve the human health problems caused by particulate matter pollution. The identification of the compositional characteristics of particulate matter presupposes the separation of particulate matter with different aerodynamic diameters and provides scientific guidance for solving the problem of atmospheric particulate matter pollution. To address this problem, a virtual impactor with a cutting particle size of 1.2 μm is designed in this paper. The influence of key parameters on the performance of the virtual impactor is also discussed. The results show that the proposed virtual impactor has a cutting particle size of 1.2um and a good steepness of the collection efficiency curve. It shows that it can effectively separate atmospheric particulate matter according to particle size and provides a design basis for realizing a low-cost atmospheric particulate matter mass concentration detection instrument. Meanwhile, we design a microfluidic chip for particulate matter detection based on this virtual impactor. The hardware circuit of this microfluidic chip is also designed.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"1 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":"134344708","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}

{"title":"Optical wireless communication-based 2K real-time video surveillance system for future underwater visual monitoring","authors":"Meiwei Kong, Hexiang Yuan, Qunhui Yang, T. Ng, Boon S. Ooi","doi":"10.1117/12.2681962","DOIUrl":"https://doi.org/10.1117/12.2681962","url":null,"abstract":"We develop an optical wireless communication-based 2K real-time video surveillance system prototype with field- programmable gate arrays. Using a 3-W blue light-emitting diode and an avalanche photo-diode, 20-m and 1.5-m real-time picture/video transmission with a high resolution of 1920 × 1080 pixels is implemented in free space and pure water channel, respectively. It indicates the good performance of the prototype, which is the first step to realize underwater visual monitoring in future human-robot interaction applications.","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":"131044663","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}

{"title":"Performance analysis of plenoptic wavefront sensor","authors":"Xiandong Su, Bing Dong","doi":"10.1117/12.2683221","DOIUrl":"https://doi.org/10.1117/12.2683221","url":null,"abstract":"As a widely used wavefront sensor in adaptive optics, Hartmann-Shack wavefront sensor (HSWFS) has a simple structure and high accuracy. However, the dynamic range and field of view of HSWFS are limited, preventing it from usage under strong turbulence conditions. Plenoptic wavefront sensor (PWFS) has the advantages of large dynamic range and detection field of view, which effectively compensates for the shortcomings of HSWFS. In this paper, we analyzed the performance of the PWFS theoretically and then verified by simulation. Because of the fundamental error in wavefront slope measurement of PWFS, the open-loop wavefront correction accuracy is unsatisfied and closed-loop correction is highly preferred.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"62 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":"128933198","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}

{"title":"Simulation and analysis of thermal characteristics of stratoshperic airship","authors":"Huiqiang Xu, Shengcheng Cui, Zhi Qiao, Z. Ye, Zihan Zhang","doi":"10.1117/12.2681809","DOIUrl":"https://doi.org/10.1117/12.2681809","url":null,"abstract":"To estimate spatial distribution of thermal characteristics of stratospheric airships, this paper considers the complex thermodynamic environment in which the airships operate, and establishes a computational model for the thermal characteristics of the airships, including thermal equilibrium equations, direct solar radiation, scattered solar radiation, Earth-reflected radiation, atmospheric infrared radiation, Earth infrared radiation, radiation heat transfer and convective heat transfer between skin units. With this model, theoretical simulations of temperature fields were performed for the airships. The simulation results show that the skin temperature of stratospheric airships are mainly affected by the intensity of solar radiation, which is lower at night and higher during the day. Under floating conditions, the skin temperature field exhibits high non-uniformity and significant temporal variations. The skin solar absorptivity of the stratospheric airship has a significant effect on the skin temperature, as reducing the solar absorptivity from 0.5 to 0.2 decreases the maximum skin temperature from 322.94K to 263.98K, with a decrease of 58.96K. The skin surface infrared emissivity is another factor which has a significant effect on the skin temperature, as increasing the surface infrared emissivity from 0.5 to 0.8 reduces the maximum skin temperature from 297.35K to 274.74K, with a decrease of 22.61K. Different seasons have a certain influence on the skin surface temperature of stratospheric airships, with a temperature difference of about 15K between the summer and the winter solstices, mainly due to the difference in solar radiation intensity received by the skin of the airship, which affects the temperature variation of the skin. The theoretical model established in this paper provide a useful tool for multi-physics simulations and analyses of stratospheric airships.","PeriodicalId":130374,"journal":{"name":"Semantic Ambient Media Experiences","volume":"2 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":"124666785","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}