Jing Li, Shu Li, Y. Zhai, Shuang Luan, Zhao-xi Wang, Yan Tang, Meishan Jin
The high spectral lidar principled sample machine that can obtain the target spectral information as well as the twodimensional images was developed from the perspective of motoring the marine oil spill pollution in this thesis, this high spectral lidar principled sample machine can cover the wavelength range from 400nm to 1100nm. And this high spectral lidar principled sample machine was applied for the remote sensing detection of vegetation, oceans, minerals and some other ground object targets, through measuring the spectral radiance of the hyperspectral laser interacting with the target and returning to the lidar receiving system, so as to realize the real-time monitoring of vegetation, oceans and minerals. For the purpose of realizing the quantitative observation, an accurate radiometric calibration on high spectral lidar was required. The radiometric calibration of high spectral lidar was aimed at its receiving system, that was to determine the responsivity of the principled sample machine to the target spectral radiance. After finishing debugging, all the indicators of the principled sample machine can meet the application requirements, which provided a new monitoring means for the marine oil spill in our country and was of great significance for the future protection of marine environment and the application and exploitation of marine resources.
{"title":"Performance evaluation and quantitative study of the hyperspectral lidar prototype for offshore oil pollution monitoring","authors":"Jing Li, Shu Li, Y. Zhai, Shuang Luan, Zhao-xi Wang, Yan Tang, Meishan Jin","doi":"10.1117/12.2667776","DOIUrl":"https://doi.org/10.1117/12.2667776","url":null,"abstract":"The high spectral lidar principled sample machine that can obtain the target spectral information as well as the twodimensional images was developed from the perspective of motoring the marine oil spill pollution in this thesis, this high spectral lidar principled sample machine can cover the wavelength range from 400nm to 1100nm. And this high spectral lidar principled sample machine was applied for the remote sensing detection of vegetation, oceans, minerals and some other ground object targets, through measuring the spectral radiance of the hyperspectral laser interacting with the target and returning to the lidar receiving system, so as to realize the real-time monitoring of vegetation, oceans and minerals. For the purpose of realizing the quantitative observation, an accurate radiometric calibration on high spectral lidar was required. The radiometric calibration of high spectral lidar was aimed at its receiving system, that was to determine the responsivity of the principled sample machine to the target spectral radiance. After finishing debugging, all the indicators of the principled sample machine can meet the application requirements, which provided a new monitoring means for the marine oil spill in our country and was of great significance for the future protection of marine environment and the application and exploitation of marine resources.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127540008","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}
The core of the study of metalens is the wavefront shaping of incident light using optical elements whose thickness is in the wavelength range. This integrated and miniaturized optical structure will be widely used in common optical instruments and nano optical devices. In this paper, the phase and group delay of light are controlled by designing the nanostructured unit, and the achromatic metalens with a large bandwidth is realized. However, achromatic metalens does not cover the whole visible spectrum. In this paper, the author demonstrates an achromatic metalens for a certain wavelength of visible light (400nm-600nm).
{"title":"A study on achromatic metalens in the visible range","authors":"Yan He","doi":"10.1117/12.2667845","DOIUrl":"https://doi.org/10.1117/12.2667845","url":null,"abstract":"The core of the study of metalens is the wavefront shaping of incident light using optical elements whose thickness is in the wavelength range. This integrated and miniaturized optical structure will be widely used in common optical instruments and nano optical devices. In this paper, the phase and group delay of light are controlled by designing the nanostructured unit, and the achromatic metalens with a large bandwidth is realized. However, achromatic metalens does not cover the whole visible spectrum. In this paper, the author demonstrates an achromatic metalens for a certain wavelength of visible light (400nm-600nm).","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115999202","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}
Moving the sound transmission device along the sound transmission path (wire rope) point by point is a common measurement method for the acoustic field characterization in an anechoic chamber. In the actual testing process, due to the influence of the weight of the sound transmission device and the wire rope, the sound transmission path will change from an ideal straight line to a curve, resulting in the measurement error for acoustic characteristics. In this paper, the catenary theoretical model is established to describe the sagging wire rope. To consider the gravity of the sound device, the finite element method is used to simulate the sound transmission path. The experimental validation shows that our model can better express the deviation of the sound transmission path concerning gravity. It is of great significance to improve the accuracy and reliability of measuring the acoustic characteristics in an anechoic chamber.
{"title":"Study on the curve error of acoustic transmission path in anechoic chamber","authors":"C. Gu, Z. Meng, Jin Li","doi":"10.1117/12.2667781","DOIUrl":"https://doi.org/10.1117/12.2667781","url":null,"abstract":"Moving the sound transmission device along the sound transmission path (wire rope) point by point is a common measurement method for the acoustic field characterization in an anechoic chamber. In the actual testing process, due to the influence of the weight of the sound transmission device and the wire rope, the sound transmission path will change from an ideal straight line to a curve, resulting in the measurement error for acoustic characteristics. In this paper, the catenary theoretical model is established to describe the sagging wire rope. To consider the gravity of the sound device, the finite element method is used to simulate the sound transmission path. The experimental validation shows that our model can better express the deviation of the sound transmission path concerning gravity. It is of great significance to improve the accuracy and reliability of measuring the acoustic characteristics in an anechoic chamber.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116561634","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}
In this paper, the three-dimensional real-life model and laser point cloud data are briefly introduced, and then the actual demand of cadastral survey under the background of big data is put forward. Finally, based on this, a new cadastral survey method is developed. Among them, it consists of three links, namely, data acquisition, data processing and the construction of cadastral model map. At the same time, the application effect of this method is verified from the aspects of result precision, work efficiency and comprehensiveness. Through verification, it can be found that, compared with the traditional surveying and mapping method, the surveying and mapping method based on 3D real-life model and laser point cloud data has higher accuracy, faster working efficiency, and can visually display the results, which is far superior to the traditional surveying method, and can be applied to practice.
{"title":"Research on cadastral survey method based on 3D reality model and laser point cloud data","authors":"Yuping Yan, Xu Yao, Yu Qiu","doi":"10.1117/12.2668120","DOIUrl":"https://doi.org/10.1117/12.2668120","url":null,"abstract":"In this paper, the three-dimensional real-life model and laser point cloud data are briefly introduced, and then the actual demand of cadastral survey under the background of big data is put forward. Finally, based on this, a new cadastral survey method is developed. Among them, it consists of three links, namely, data acquisition, data processing and the construction of cadastral model map. At the same time, the application effect of this method is verified from the aspects of result precision, work efficiency and comprehensiveness. Through verification, it can be found that, compared with the traditional surveying and mapping method, the surveying and mapping method based on 3D real-life model and laser point cloud data has higher accuracy, faster working efficiency, and can visually display the results, which is far superior to the traditional surveying method, and can be applied to practice.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130493634","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}
In order to ensure the measurement accuracy and long-term working stability of the laser methane sensor in the field environment such as coal mines, a design method of a high-precision double-closed-loop laser temperature control system based on the laser absorption peak and working temperature is proposed to improve the temperature control system of the DFB laser. control accuracy. Based on ADN8834 integrated TEC controller chip, the temperature control system based on PI compensation network is designed, and the simulation analysis of the temperature control system is carried out. In order to verify the accuracy and long-term working stability of the temperature control system, the laser methane sensor has passed the (-20~60)℃ high and low temperature experiment. The application of methane sensors in industrial sites such as coal mines provides technical support.
{"title":"Design and simulation test of DFB laser temperature control system","authors":"Qing-hua Guo","doi":"10.1117/12.2668056","DOIUrl":"https://doi.org/10.1117/12.2668056","url":null,"abstract":"In order to ensure the measurement accuracy and long-term working stability of the laser methane sensor in the field environment such as coal mines, a design method of a high-precision double-closed-loop laser temperature control system based on the laser absorption peak and working temperature is proposed to improve the temperature control system of the DFB laser. control accuracy. Based on ADN8834 integrated TEC controller chip, the temperature control system based on PI compensation network is designed, and the simulation analysis of the temperature control system is carried out. In order to verify the accuracy and long-term working stability of the temperature control system, the laser methane sensor has passed the (-20~60)℃ high and low temperature experiment. The application of methane sensors in industrial sites such as coal mines provides technical support.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132250094","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}
Glasses-free three-dimensional (3D) display has attracted widespread attention because of its multi-perception, interactivity and immersion features. Limited by the resolution of the display, the number of views and the spatial resolution of the views are contradictory. In this paper, we propose a vector light field display with multi-directional backlight, which is realized by two directional backlight illumination display modules. By analyzing the deflection error of diffracted light, a suitable directional backlight angular separation is designed. Experimental results show that the proposed prototype generates full-color 3D images that satisfies binocular parallax for the observer, effectively eliminates the gaps between views. The multi-directional backlight module is adopted to maximize the use of the number of views and expand the field of view (FOV). Potential applications include entertainment, exhibition displays, and education.
{"title":"Vector light field 3D display with multi-directional backlight","authors":"Yang Li, Wen Qiao","doi":"10.1117/12.2667923","DOIUrl":"https://doi.org/10.1117/12.2667923","url":null,"abstract":"Glasses-free three-dimensional (3D) display has attracted widespread attention because of its multi-perception, interactivity and immersion features. Limited by the resolution of the display, the number of views and the spatial resolution of the views are contradictory. In this paper, we propose a vector light field display with multi-directional backlight, which is realized by two directional backlight illumination display modules. By analyzing the deflection error of diffracted light, a suitable directional backlight angular separation is designed. Experimental results show that the proposed prototype generates full-color 3D images that satisfies binocular parallax for the observer, effectively eliminates the gaps between views. The multi-directional backlight module is adopted to maximize the use of the number of views and expand the field of view (FOV). Potential applications include entertainment, exhibition displays, and education.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133145492","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}
The standard evaluation methods of the imaging quality of optical imaging systems are divided into evaluation methods based on electrical signals and evaluation methods based on images, but the impact of environmental testing on the imaging quality is rarely studied. This paper aims to analyze the imaging quality of a typical optical imaging system before and after the salt mist testing. By studying its imaging resolution and setting up different optical environments, the influence of salt mist testing on its imaging resolution under different optical environments is discussed here. It is found that different illumination conditions have great influence on imaging resolution, and good illumination conditions can effectively improve the resolution of camera products. In the other hand, salt mist aging testing has a great influence on the imaging resolution of the camera products, and longtime exposure to sodium chloride solution has an irreversible effect on the imaging performance of the camera. The tolerance of cameras to salt mist aging test shows two-level distribution. Some products are completely invalid, and some products have good tolerance and no obvious failure.
{"title":"Effect of the salt mist testing on imaging resolution of the optical imaging system","authors":"T. Wang, Su-Feng Chen, Y. Pang","doi":"10.1117/12.2667355","DOIUrl":"https://doi.org/10.1117/12.2667355","url":null,"abstract":"The standard evaluation methods of the imaging quality of optical imaging systems are divided into evaluation methods based on electrical signals and evaluation methods based on images, but the impact of environmental testing on the imaging quality is rarely studied. This paper aims to analyze the imaging quality of a typical optical imaging system before and after the salt mist testing. By studying its imaging resolution and setting up different optical environments, the influence of salt mist testing on its imaging resolution under different optical environments is discussed here. It is found that different illumination conditions have great influence on imaging resolution, and good illumination conditions can effectively improve the resolution of camera products. In the other hand, salt mist aging testing has a great influence on the imaging resolution of the camera products, and longtime exposure to sodium chloride solution has an irreversible effect on the imaging performance of the camera. The tolerance of cameras to salt mist aging test shows two-level distribution. Some products are completely invalid, and some products have good tolerance and no obvious failure.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130712761","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}
Ethanol has a characteristic narrow band absorption peak (2989.6 cm-1) that overlaps heavily with the airborne water vapour spectrum, severely affecting detection accuracy when the ambient humidity varies significantly. To this end it is particularly critical to investigate a method to eliminate background effects and improve the accuracy of ethanol telemetry. Firstly, the second harmonic signal of ethanol concentration under 5000~20000ppm*m water vapour environment was simulated by multi-functional fitting method, and the multivariate linear relationship between the second harmonic amplitude and water vapour concentration and ethanol concentration is obtained. Two sets of signals were obtained in one triangular wave period using double modulated amplitude and linear regression was used to solve the coefficients of the two equations, which in turn inverted the ethanol concentration in other water vapour environments. Simulation results show that the maximum error is less than 2.23ppm*m. The method also eliminates the need for complex reference light paths or expensive wide-range tunable mid-infrared lasers, reduces measurement errors due to variations in ambient humidity, and provides a basis for further development of simple, miniaturised ethanol telemetry systems.
{"title":"Algorithm study and simulation analysis of double amplitude modulated for stand-off detection of ethanol","authors":"Yu-Hua Zhang, Jinfeng Zhou, Ju Yu, Xiaosong Shi, Yifan Wang, Xudong Feng","doi":"10.1117/12.2667862","DOIUrl":"https://doi.org/10.1117/12.2667862","url":null,"abstract":"Ethanol has a characteristic narrow band absorption peak (2989.6 cm-1) that overlaps heavily with the airborne water vapour spectrum, severely affecting detection accuracy when the ambient humidity varies significantly. To this end it is particularly critical to investigate a method to eliminate background effects and improve the accuracy of ethanol telemetry. Firstly, the second harmonic signal of ethanol concentration under 5000~20000ppm*m water vapour environment was simulated by multi-functional fitting method, and the multivariate linear relationship between the second harmonic amplitude and water vapour concentration and ethanol concentration is obtained. Two sets of signals were obtained in one triangular wave period using double modulated amplitude and linear regression was used to solve the coefficients of the two equations, which in turn inverted the ethanol concentration in other water vapour environments. Simulation results show that the maximum error is less than 2.23ppm*m. The method also eliminates the need for complex reference light paths or expensive wide-range tunable mid-infrared lasers, reduces measurement errors due to variations in ambient humidity, and provides a basis for further development of simple, miniaturised ethanol telemetry systems.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127562514","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}
In terms of light field image array generation, the traditional method of multi-view parallax image synthesis has problems such as computational redundancy and slow pixel mapping. We propose a new design method for light field image arrays for 3D printed images based on backward ray tracing techniques. The farthest point of collision is found when a ray collides with an object. The rendering time is greatly reduced compared to traditional methods, and only related to the resolution of light field image array. Combine with microlens array, 3D printing image with continuous and dynamic parallax effects is obtained, the correctness of the algorithm is proved.
{"title":"Light field image array generation for 3D printing image based on backward ray tracing","authors":"Yang Chen, Wen Qiao","doi":"10.1117/12.2667942","DOIUrl":"https://doi.org/10.1117/12.2667942","url":null,"abstract":"In terms of light field image array generation, the traditional method of multi-view parallax image synthesis has problems such as computational redundancy and slow pixel mapping. We propose a new design method for light field image arrays for 3D printed images based on backward ray tracing techniques. The farthest point of collision is found when a ray collides with an object. The rendering time is greatly reduced compared to traditional methods, and only related to the resolution of light field image array. Combine with microlens array, 3D printing image with continuous and dynamic parallax effects is obtained, the correctness of the algorithm is proved.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114009907","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}
Bing Tang, Chen Liang, Yongbin Li, Chen Wang, Ming Hao, Yangyang Zhang, Tao Huang, Guang Li, Jie Zhu
Laser degumming is a new technology in the maintenance of press valve, which has the advantages of high efficiency, high accuracy, complete degumming and low pollution. However, the metal matrix is prone to thermal damage when subjected to laser action. It is found that 1Cr18Ni9Ti is the most prone to oxidation. If 1Cr18Ni9Ti is not damaged, 2A12 and HPB59 materials will not be damaged under the same laser parameter processing. The internal metallographic structure of 1Cr18Ni9Ti sample does not change when it is oxidized at the boundary without illumination. Therefore, if the nonilluminated surface does not oxidize, it can be considered that the internal metallography of the press valve has not changed; The simulation model of rubber removal was established, and it was found that the method of switching off and on light could control the temperature in the process. When the time ratio of switching on and off light was 1: 3, the rubber residue could be completely removed without damaging the rubber press valve. The simulation parameters are applied to the actual parts experiment, and the simulation results are verified to be reliable, the temperature is controllable and the parts have no damage. The research results in this paper can achieve the task of rubber removal without damaging the substrate.
{"title":"Study on laser degumming and non-destructive technology of rubber press valve","authors":"Bing Tang, Chen Liang, Yongbin Li, Chen Wang, Ming Hao, Yangyang Zhang, Tao Huang, Guang Li, Jie Zhu","doi":"10.1117/12.2668336","DOIUrl":"https://doi.org/10.1117/12.2668336","url":null,"abstract":"Laser degumming is a new technology in the maintenance of press valve, which has the advantages of high efficiency, high accuracy, complete degumming and low pollution. However, the metal matrix is prone to thermal damage when subjected to laser action. It is found that 1Cr18Ni9Ti is the most prone to oxidation. If 1Cr18Ni9Ti is not damaged, 2A12 and HPB59 materials will not be damaged under the same laser parameter processing. The internal metallographic structure of 1Cr18Ni9Ti sample does not change when it is oxidized at the boundary without illumination. Therefore, if the nonilluminated surface does not oxidize, it can be considered that the internal metallography of the press valve has not changed; The simulation model of rubber removal was established, and it was found that the method of switching off and on light could control the temperature in the process. When the time ratio of switching on and off light was 1: 3, the rubber residue could be completely removed without damaging the rubber press valve. The simulation parameters are applied to the actual parts experiment, and the simulation results are verified to be reliable, the temperature is controllable and the parts have no damage. The research results in this paper can achieve the task of rubber removal without damaging the substrate.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114022558","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}
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