International Conference on Precision Instruments and Optical Engineering最新文献_第4页

FMCW LiDAR-based ranging system application to VR optical measurement 基于FMCW激光雷达的测距系统在VR光学测量中的应用

International Conference on Precision Instruments and Optical Engineering Pub Date : 2023-02-27 DOI: 10.1117/12.2667878

Bing Dai, Yongyan Xie, Jiajing Wu, Yingjie Peng

引用次数: 0

Real-time warpage deformation monitoring using distributed optical fiber sensing 基于分布式光纤传感的实时翘曲变形监测

International Conference on Precision Instruments and Optical Engineering Pub Date : 2023-02-27 DOI: 10.1117/12.2668453

Shun Liu, P. Zhu, Zhecong Lin, Yabin Zhou, M. Soto

引用次数: 0

Research on forest height inversion algorithm based on X-band SAR data 基于x波段SAR数据的森林高程反演算法研究

International Conference on Precision Instruments and Optical Engineering Pub Date : 2023-02-27 DOI: 10.1117/12.2667940

Chen Shen, Jinlan Zhang, Teng Zhu, C. Yue, Wanqiu Zhang

引用次数: 0

Investigation of spatial spin polarization of 87Rb and 129Xe atomic ensemble pumped by Gaussian beam in a miniature nuclear magnetic resonance gyroscope 高斯束泵浦87Rb和129Xe原子系综在微型核磁共振陀螺仪中的空间自旋极化研究

International Conference on Precision Instruments and Optical Engineering Pub Date : 2023-02-27 DOI: 10.1117/12.2667783

Shu Qiang, Ji Fang

{"title":"Investigation of spatial spin polarization of 87Rb and 129Xe atomic ensemble pumped by Gaussian beam in a miniature nuclear magnetic resonance gyroscope","authors":"Shu Qiang, Ji Fang","doi":"10.1117/12.2667783","DOIUrl":"https://doi.org/10.1117/12.2667783","url":null,"abstract":"The spin polarization of 87Rb and 129Xe atomic ensemble has great impact on the signal intensity of a nuclear magnetic resonance gyroscope. The coupled spin polarization modelling process for 87Rb and 129Xe atoms ensemble is presented in detail. Three dimensional spatial distribution of the spin polarization field is obtained by numerical solution and is in good agreement with the experiment results. Influencing factors including temperature, power and detuned frequency of the pumping laser, average collision times of anti-relaxation coatings and partial pressure of gas composition are investigated. The work presents an indirect method to estimate the average collision times given the Xe polarization with different temperatures. It is found the average collision times of the 129Xe atoms with the inner surface of a bare glass cell of 3×3×3mm3 can reach up to about 2.7×105 times. It is also found that the pumping frequency corresponding to the maximum polarization of the Xe atoms polarized by spin exchange of Rb atoms is not consistent with the D1 line of the 87Rb atom when the temperature of the cell is above a certain temperature, but is detuned at a certain frequency. Quantitative analysis of the effect of anti-relaxation coatings on the spin polarization suggests that the appropriate average number of collisions of the Rb atoms with the inner surface of the cell is about 1500 times.","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":"127737359","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: 1

Research and verification of space position of precast segmental beam based on photogrammetry 基于摄影测量的预制节段梁空间位置的研究与验证

International Conference on Precision Instruments and Optical Engineering Pub Date : 2023-02-27 DOI: 10.1117/12.2667859

ChenYang Fan, Maolin Cheng, Hao Xiao, Zhangyan Zhao

{"title":"Research and verification of space position of precast segmental beam based on photogrammetry","authors":"ChenYang Fan, Maolin Cheng, Hao Xiao, Zhangyan Zhao","doi":"10.1117/12.2667859","DOIUrl":"https://doi.org/10.1117/12.2667859","url":null,"abstract":"In the process of aligning and assembling prefabricated segmental beams, the measurement method of using total station to obtain spatial pose has the problems of high manual dependence, low measurement efficiency and high construction risk. The existing non-contact measurement methods are analyzed. It is concluded that photogrammetry has the conditions to realize automatic measurement and can reduce certain construction risks. According to the complex situation of bridge construction site and the harsh environment, traditional camera calibration methods are not applicable. Therefore, a self-calibration method is proposed. At the same time, according to the self-calibration algorithm, all photos taken cannot be solved, and there are problems of photo redundancy. The algorithm is further optimized to obtain a focal length calibration method based on global scanning, and the camera shooting is used to test and verify the construction site of prefabricated segmental beam assembly to explore whether the measurement accuracy of the method can meet the construction requirements in the actual construction environment. The results show that the measurement method can be realized in the construction environment of precast segmental beams. And the measurement accuracy meets the assembly requirements of precast segmental beams.","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":"128297321","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

Research on relative positioning algorithm for large aircraft aerial refueling 大型飞机空中加油相对定位算法研究

International Conference on Precision Instruments and Optical Engineering Pub Date : 2023-02-27 DOI: 10.1117/12.2667896

Jun Yu Li, Jixuan Zhang

引用次数: 2

Design of seed laser injection locking system for 2μm solid-state laser based on FPGA 基于FPGA的2μm固体激光器种子激光注入锁定系统设计

International Conference on Precision Instruments and Optical Engineering Pub Date : 2023-02-27 DOI: 10.1117/12.2667935

Dongfang Guo, Yuan Gao, Hongzhi Yang, Junru Zhou, Y. Mao, Zi-li Zhang, L. Wang

{"title":"Design of seed laser injection locking system for 2μm solid-state laser based on FPGA","authors":"Dongfang Guo, Yuan Gao, Hongzhi Yang, Junru Zhou, Y. Mao, Zi-li Zhang, L. Wang","doi":"10.1117/12.2667935","DOIUrl":"https://doi.org/10.1117/12.2667935","url":null,"abstract":"The excellent properties of the narrow linewidth, single longitudinal mode and constant frequency of the seed-injected solid-state single-frequency pulse laser make it suitable in the applications of the gravitational wave detection, doppler wind radar, and greenhouse gas flux measurement. FPGAs have been widely utilized in the laser electronic control systems due to its high integration and parallel processing capabilities. Based on the classical Ramp-Hold-Fire principle, we develop an injection locking system by using the modular FPGA architecture and the Verilog programming language. To demonstrate the program's viability, Vivado software is utilized for online simulation and debugging to guarantee the correctness of time conversion between different modules. The simulation results show a good time match between the master and slave lasers. The realization of seed injection locking is verified by detecting the increase of output laser energy, shortening pulse setup time and single longitudinal mode output pulse after injection. Finally, a 2 μm single frequency pulse laser is generated with a repetition rate 300 Hz and output power 4.5 mJ.","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":"121682577","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

Application of three-dimensional laser measurement technology in dynamic monitoring of mine geological environment 三维激光测量技术在矿山地质环境动态监测中的应用

International Conference on Precision Instruments and Optical Engineering Pub Date : 2023-02-27 DOI: 10.1117/12.2667945

Yi Wang, Wei Sun, Peiyong He, Wen Qiao

引用次数: 0

Research on method of avoiding phase unwrapping error in 3D measurement of gray code 灰度码三维测量中相位展开误差的避免方法研究

International Conference on Precision Instruments and Optical Engineering Pub Date : 2023-02-27 DOI: 10.1117/12.2667751

JiLong Xia, Xiaofei Wang, H. Fan

{"title":"Research on method of avoiding phase unwrapping error in 3D measurement of gray code","authors":"JiLong Xia, Xiaofei Wang, H. Fan","doi":"10.1117/12.2667751","DOIUrl":"https://doi.org/10.1117/12.2667751","url":null,"abstract":"In the field of industrial automation, accurate acquisition of object three-dimensional information is beneficial to better product design. Structured light three-dimensional measurement technique has been widely used in industrial inspection and reverse engineering because of its advantages of non-contact and high measurement accuracy. The structured light three-dimensional measurement technique combined with gray code and phase shift method has high efficiency and strong robustness. However, in the process of extract the phase map of the measured objects, there will be misalignment between the wrapped phase and the fringe order. This will lead to the jump error of wrapping phase edge in phase unwrapping process, which will reduce the measurement accuracy. To solve this problem, the fast tripartite phase unwrapping method is proposed in this paper, which can effectively eliminate the phase unwrapping error and significantly improve the computational efficiency. Firstly, the mask image is obtained by threshold segmentation of full-bright images using OTSU method. Subsequently, phase unwrapping is carried out under the guidance of gray code coding sequence, and the absolute phase value of the target is obtained. In the process of phase unwrapping, the mask image is used as the guide to improve the phase decoding efficiency, and tripartite phase unwrapping method is used to eliminate the phase unwrapping error. Experimental results show that this algorithm eliminates the edge jump error and improves the efficiency of normal gray code phase unwrapping method.","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":"115296801","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

Frequency spectrum analysis and control technology analysis of converter noise in substation 变电站变流器噪声的频谱分析及控制技术分析

International Conference on Precision Instruments and Optical Engineering Pub Date : 2023-02-27 DOI: 10.1117/12.2667921

Kun Wang, Lianke Xie, Yidan Zhu, Hongbing Su, Dandan Dou, Guoying Zhang

引用次数: 0