Bo Wang, Guoquan Ren, Zhining Li, Qingzhu Li, Ziming Cai
In this paper, the five-sensor magnetic gradient tensor system is taken as the research object, and the alignment error correction is studied. Firstly, a single sensor error model is established. Secondly, the overall error model is established. Finally, the proposed method is verified by simulation. The simulation results show that the proposed correction method can effectively reduce the alignment error of the system.
{"title":"Alignment error correction of five-sensor planar cross magnetic gradient tensor system","authors":"Bo Wang, Guoquan Ren, Zhining Li, Qingzhu Li, Ziming Cai","doi":"10.1117/12.2668456","DOIUrl":"https://doi.org/10.1117/12.2668456","url":null,"abstract":"In this paper, the five-sensor magnetic gradient tensor system is taken as the research object, and the alignment error correction is studied. Firstly, a single sensor error model is established. Secondly, the overall error model is established. Finally, the proposed method is verified by simulation. The simulation results show that the proposed correction method can effectively reduce the alignment error of the system.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114879155","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}
Temperature is one of the main factors affecting the normal operation of the optical system of laser communication equipment. Based on the requirements of the air-based platform for the surface shape index of airborne communication equipment, the optical-mechanical thermal integration analysis method is used to analyze the optical system of an airborne communication optical machine. Firstly, the finite element model of the air-based laser communication prototype is established. Secondly, the temperature field distribution and thermal deformation characteristics of the optical system structure during the full-load operation of the communication prototype are extracted by Ansys Workbench finite element analysis software, and the surface shape changes of the primary and secondary mirrors of the beam expansion system under the action of the heat source load are obtained. Finally, the optical software program SigFit is used for Zernike polynomial fitting, and the performance of the laser communication prototype beam expansion system is evaluated according to the fitting results. The results show that the maximum axial displacement of the primary and secondary mirrors of the beam expansion system is less than 0.02mm under both horizontal and vertical conditions of the optical axis when the communication optical machine is fully loaded at an ambient temperature of 22℃, and the mirror surface shape is better than λ/50, which meets the performance index and can adapt to the temperature environment requirements of airborne communication equipment on air-based platforms.
{"title":"Thermal integration analysis of optical machines for space-based laser communications","authors":"Zikang Hu, Shaobo Li, Mengqi Shao, Zeyao An","doi":"10.1117/12.2667889","DOIUrl":"https://doi.org/10.1117/12.2667889","url":null,"abstract":"Temperature is one of the main factors affecting the normal operation of the optical system of laser communication equipment. Based on the requirements of the air-based platform for the surface shape index of airborne communication equipment, the optical-mechanical thermal integration analysis method is used to analyze the optical system of an airborne communication optical machine. Firstly, the finite element model of the air-based laser communication prototype is established. Secondly, the temperature field distribution and thermal deformation characteristics of the optical system structure during the full-load operation of the communication prototype are extracted by Ansys Workbench finite element analysis software, and the surface shape changes of the primary and secondary mirrors of the beam expansion system under the action of the heat source load are obtained. Finally, the optical software program SigFit is used for Zernike polynomial fitting, and the performance of the laser communication prototype beam expansion system is evaluated according to the fitting results. The results show that the maximum axial displacement of the primary and secondary mirrors of the beam expansion system is less than 0.02mm under both horizontal and vertical conditions of the optical axis when the communication optical machine is fully loaded at an ambient temperature of 22℃, and the mirror surface shape is better than λ/50, which meets the performance index and can adapt to the temperature environment requirements of airborne communication equipment on air-based platforms.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114286404","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}
This paper mainly discusses the underwater fog technology, and mainly uses some image evaluation algorithms. Compared with other image processing algorithms, it improves the running speed of the algorithm. In short, the underwater image denoising and contrast after processing are better than the traditional image polarization defogging algorithm. The experiment specifically uses the split focus plane polarization imaging system to collect polarization pictures from multiple angles in multiple underwater scenes, and calculate its polarization stokes vector, calculate the polarization information of the scene through the stokes vector, use the general light source and linear polarization light source to illuminate the diffuse reflection and specular reflection targets respectively, compare the polarization information of different scenes, and get that the polarization information distribution of the background and target of the scene using polarization light source is clearer than that of the general light source. Then, a stokes polarization defogging algorithm is proposed. The polarization degree information calculated by stokes vector is compared with the transmission information obtained by the dark channel prior algorithm. It is found that under the condition of using polarized light source and uniform illumination, the transmission of scene can be predicted by DOP (Degree of polarization) calculated by stokes vector and used for image defogging, then some image evaluation algorithms are used to compare it with other image processing algorithms, which improves the running speed of the algorithm. The denoising and contrast of the underwater image after processing are better than the traditional image polarization defogging algorithm.
{"title":"Underwater polarization defogging technology based on Stokes","authors":"Lili Wang, Zhuang Zhou, Tenghui Wang, Zefeng Zhao, Jiongjiang Chen, Y. Lai, Wanxin Liang","doi":"10.1117/12.2668221","DOIUrl":"https://doi.org/10.1117/12.2668221","url":null,"abstract":"This paper mainly discusses the underwater fog technology, and mainly uses some image evaluation algorithms. Compared with other image processing algorithms, it improves the running speed of the algorithm. In short, the underwater image denoising and contrast after processing are better than the traditional image polarization defogging algorithm. The experiment specifically uses the split focus plane polarization imaging system to collect polarization pictures from multiple angles in multiple underwater scenes, and calculate its polarization stokes vector, calculate the polarization information of the scene through the stokes vector, use the general light source and linear polarization light source to illuminate the diffuse reflection and specular reflection targets respectively, compare the polarization information of different scenes, and get that the polarization information distribution of the background and target of the scene using polarization light source is clearer than that of the general light source. Then, a stokes polarization defogging algorithm is proposed. The polarization degree information calculated by stokes vector is compared with the transmission information obtained by the dark channel prior algorithm. It is found that under the condition of using polarized light source and uniform illumination, the transmission of scene can be predicted by DOP (Degree of polarization) calculated by stokes vector and used for image defogging, then some image evaluation algorithms are used to compare it with other image processing algorithms, which improves the running speed of the algorithm. The denoising and contrast of the underwater image after processing are better than the traditional image polarization defogging algorithm.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123030239","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}
Algorithms for locating the center position of the crosshair image are studied, and a method based on machine vision to verify the compensation error of automatic levels is proposed. An illumination device is added behind the reticle of the automatic level. The reticle image is focused to infinity, imaged on the focal plane of the lens of the collimator, and images are captured using a CCD camera. Moreover, the necessary processing is performed to locate the center position of the crosshair image by the gray squared center of gravity method and the iterative weighted fitting method to obtain the subpixel level position coordinates. The metrological verification of the compensation error is completed after calibrating the angular grid values of the CCD in the x and y directions, the error angles of the x and y axes, and the parameters of the collimator coordinate system and attitude. The experimental results show that the machine vision-based method meets the requirements of the metrological verification of the compensation error of automatic levels, and the accuracy of the measurement results is higher than the traditional optical method.
{"title":"Machine-vision-based automatic levels compensation error verification","authors":"Yucheng Wang, Haibo Liu","doi":"10.1117/12.2667792","DOIUrl":"https://doi.org/10.1117/12.2667792","url":null,"abstract":"Algorithms for locating the center position of the crosshair image are studied, and a method based on machine vision to verify the compensation error of automatic levels is proposed. An illumination device is added behind the reticle of the automatic level. The reticle image is focused to infinity, imaged on the focal plane of the lens of the collimator, and images are captured using a CCD camera. Moreover, the necessary processing is performed to locate the center position of the crosshair image by the gray squared center of gravity method and the iterative weighted fitting method to obtain the subpixel level position coordinates. The metrological verification of the compensation error is completed after calibrating the angular grid values of the CCD in the x and y directions, the error angles of the x and y axes, and the parameters of the collimator coordinate system and attitude. The experimental results show that the machine vision-based method meets the requirements of the metrological verification of the compensation error of automatic levels, and the accuracy of the measurement results is higher than the traditional optical method.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127860528","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}
Mohan Chen, Wenxian Zhang, X. Du, Huan Liang, Yumeng Wu, Yuxin Fan, M. Jin, Jiankai Sun
Under the background of information technology, virtual reality technology has gradually been applied to the field of education and training. Immersive VR can promote the progress of university education, realize the transformation of university education from two-dimensional flat teaching to three-dimensional three-dimensional teaching, and enhance the situational and contextual nature of classroom teaching. Interactivity. The application of VR technology in education can effectively improve the learning effect and enthusiasm of students. Students can independently choose their own learning time, learning location, and learning style, with stronger learning motivation and higher autonomy. This article is based on the establishment of an immersive interactive teaching platform and a teaching resource library so that users can better enter the learning atmosphere.
{"title":"Research on interactive teaching platform based on VR technology","authors":"Mohan Chen, Wenxian Zhang, X. Du, Huan Liang, Yumeng Wu, Yuxin Fan, M. Jin, Jiankai Sun","doi":"10.1117/12.2668106","DOIUrl":"https://doi.org/10.1117/12.2668106","url":null,"abstract":"Under the background of information technology, virtual reality technology has gradually been applied to the field of education and training. Immersive VR can promote the progress of university education, realize the transformation of university education from two-dimensional flat teaching to three-dimensional three-dimensional teaching, and enhance the situational and contextual nature of classroom teaching. Interactivity. The application of VR technology in education can effectively improve the learning effect and enthusiasm of students. Students can independently choose their own learning time, learning location, and learning style, with stronger learning motivation and higher autonomy. This article is based on the establishment of an immersive interactive teaching platform and a teaching resource library so that users can better enter the learning atmosphere.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":"45 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120913648","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}
Denoising is significant in many fields, especially for computational imaging. Coherent diffraction imaging and speckle correlation imaging are regarded as the most promising computational imaging techniques. The above two imaging techniques can be classified as phase-retrieval-based imaging due to the phase-retrieval is a vital procedure for object reconstruction. However, the acquisition process would generate unavoidable noise and participate in the iteration process of phase-retrieval. Hence, it is necessary to denoising after obtained the original reconstruction image. Here, a denoising method that based on connected domain is proposed for phase-retrieval method. We experimentally demonstrate the denoising results and quantitatively analyze the effect. Comparison of the classical median filter, wiener filter and bilateral filter, our method shows a satisfactory denoising effect. Our results prove that connected domain denoising is useful and promising, which provides a new post-processing denoising method for phase-retrieval-based imaging.
{"title":"A denoising method for phase-retrieval-based imaging","authors":"Shuyue Zhu, Wen-jun Yi, Meicheng Fu, Junli Qi, Mengjun Zhu, Xiujian Li","doi":"10.1117/12.2667772","DOIUrl":"https://doi.org/10.1117/12.2667772","url":null,"abstract":"Denoising is significant in many fields, especially for computational imaging. Coherent diffraction imaging and speckle correlation imaging are regarded as the most promising computational imaging techniques. The above two imaging techniques can be classified as phase-retrieval-based imaging due to the phase-retrieval is a vital procedure for object reconstruction. However, the acquisition process would generate unavoidable noise and participate in the iteration process of phase-retrieval. Hence, it is necessary to denoising after obtained the original reconstruction image. Here, a denoising method that based on connected domain is proposed for phase-retrieval method. We experimentally demonstrate the denoising results and quantitatively analyze the effect. Comparison of the classical median filter, wiener filter and bilateral filter, our method shows a satisfactory denoising effect. Our results prove that connected domain denoising is useful and promising, which provides a new post-processing denoising method for phase-retrieval-based imaging.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126897155","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 phase screen with different atmospheric turbulence intensities was numerically simulated by Fourier transform method. Meanwhile, the phase and light intensity distribution characteristics of the Gaussian laser beam passing through the atmospheric turbulence were numerically studied, and the theoretical results and practical conclusions of the atmospheric phase screen were verified. The results show that the phase screen produced by Fourier transform method can intuitively illustrate the phase characteristics of atmospheric turbulence, and the phase and light intensity distribution of the Gaussian laser beam passing through atmospheric turbulence of different intensities were consistent with the theoretical analysis. Numerical simulation has certain guiding significance for the engineering application of laser transmission in the atmosphere.
{"title":"Numerical study of turbulence effect of Gaussian laser beam propagation in atmosphere","authors":"Yufa Zhang, Yangyang Wang, Zongwei Ou, Xin Hu","doi":"10.1117/12.2667937","DOIUrl":"https://doi.org/10.1117/12.2667937","url":null,"abstract":"The phase screen with different atmospheric turbulence intensities was numerically simulated by Fourier transform method. Meanwhile, the phase and light intensity distribution characteristics of the Gaussian laser beam passing through the atmospheric turbulence were numerically studied, and the theoretical results and practical conclusions of the atmospheric phase screen were verified. The results show that the phase screen produced by Fourier transform method can intuitively illustrate the phase characteristics of atmospheric turbulence, and the phase and light intensity distribution of the Gaussian laser beam passing through atmospheric turbulence of different intensities were consistent with the theoretical analysis. Numerical simulation has certain guiding significance for the engineering application of laser transmission in the atmosphere.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130482044","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 phase unwrapping method is the important step of phase retrieval in fringe projection profilometry. Although the mask cut (MC) algorithm has been successfully applied in multiple fields, it also has inherent flaws. In order to overcome the shortcomings of MC algorithm, and synthesize the advantages of MC and quality-guided (QG) algorithm, a quality-guided mask-cutting (QG - MC) algorithm for phase unwrapping is proposed. The basic idea of QG - MC algorithm is to reduce the effects of noise on phase unwrapping at first., Then, the process of phase unwrapping is guided by the phase quality map from the point with the highest quality value to the point around that point. Take the point with the highest quality as the seed point, put its adjacent points into the queue, sort by quality value, and the new highest quality point is used as a seed point. Repeats the process until the queue is empty and the unwrapped phase will be obtained. To verify the feasibility and reliability of QG - MC algorithm, computer simulations and real experiments are carried out. The results show that the algorithm improves the efficiency of phase unwrapping.
{"title":"Quality-guided mask cut method for phase unwrapping","authors":"Minghao Dong, Jun Ma, Cuieng Xu, Jing Ling","doi":"10.1117/12.2668325","DOIUrl":"https://doi.org/10.1117/12.2668325","url":null,"abstract":"The phase unwrapping method is the important step of phase retrieval in fringe projection profilometry. Although the mask cut (MC) algorithm has been successfully applied in multiple fields, it also has inherent flaws. In order to overcome the shortcomings of MC algorithm, and synthesize the advantages of MC and quality-guided (QG) algorithm, a quality-guided mask-cutting (QG - MC) algorithm for phase unwrapping is proposed. The basic idea of QG - MC algorithm is to reduce the effects of noise on phase unwrapping at first., Then, the process of phase unwrapping is guided by the phase quality map from the point with the highest quality value to the point around that point. Take the point with the highest quality as the seed point, put its adjacent points into the queue, sort by quality value, and the new highest quality point is used as a seed point. Repeats the process until the queue is empty and the unwrapped phase will be obtained. To verify the feasibility and reliability of QG - MC algorithm, computer simulations and real experiments are carried out. The results show that the algorithm improves the efficiency of phase unwrapping.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132816734","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 calibration accuracy of inertial measurement unit (IMU) is one of the important factors affecting the positioning accuracy of strapdown inertial navigation system (SINS). A 24-sequence calibration rotation scheme is proposed in this paper, which improves the observability and observability degree compared with the traditional 18-sequence scheme, and makes the calibration results more accurate. Simulation results show that the calibration results of 24-sequence scheme are closer to the actual value than those of 18-sequence scheme.
{"title":"A 24-sequence calibration scheme of laser gyro strapdown inertial navigation system","authors":"Huiying Fan, Haonan Liu, Junhong Liu, Qiongnan Huang, Zhanming Hu, Fang Lin, Gongchang Wang","doi":"10.1117/12.2668359","DOIUrl":"https://doi.org/10.1117/12.2668359","url":null,"abstract":"The calibration accuracy of inertial measurement unit (IMU) is one of the important factors affecting the positioning accuracy of strapdown inertial navigation system (SINS). A 24-sequence calibration rotation scheme is proposed in this paper, which improves the observability and observability degree compared with the traditional 18-sequence scheme, and makes the calibration results more accurate. Simulation results show that the calibration results of 24-sequence scheme are closer to the actual value than those of 18-sequence scheme.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115456128","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}
There are many kinds of infrared detection system operating range evaluation models and their parameters are complex, which result in the lacking of evidence for model selection in practical application. To solve this problem, the adaptability of four common operating range models of infrared detection system are analyzed. Using theoretical and simulation analysis, the defects of traditional model, NETD based model and SNR based model in practical application are pointed out, and the model based on NEP is selected as the operating range evaluation model of airborne infrared detection system. Then an operating range evaluation system is developed to provide reference and evidence for model selection in practical application.
{"title":"Applicability analysis of operating range model of airborne infrared detection system","authors":"Min Y. Liu, Caiping Dong, X. Li, Xiguo Liu","doi":"10.1117/12.2667939","DOIUrl":"https://doi.org/10.1117/12.2667939","url":null,"abstract":"There are many kinds of infrared detection system operating range evaluation models and their parameters are complex, which result in the lacking of evidence for model selection in practical application. To solve this problem, the adaptability of four common operating range models of infrared detection system are analyzed. Using theoretical and simulation analysis, the defects of traditional model, NETD based model and SNR based model in practical application are pointed out, and the model based on NEP is selected as the operating range evaluation model of airborne infrared detection system. Then an operating range evaluation system is developed to provide reference and evidence for model selection in practical application.","PeriodicalId":227067,"journal":{"name":"International Conference on Precision Instruments and Optical Engineering","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115674865","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：