Yubin Du, Pin Cao, Yongying Yang, Fanyi Wang, Rongzhi Liu, Fan Wu, Pengfei Zhang, Huiting Chai, Jiabin Jiang, Yihui Zhang, Guohua Feng, Xiang Xiao, Yanwei Li
Aimed at the problem of strong background interference introduced in digital image processing from complex surfaces under industrial defect detection, a method for complex surface defect detection based on human visual characteristics and feature extracting is proposed. Inspired by the visual attention mechanism, defect areas can be identified from the background noise conveniently by human eyes. We introduce the improved grayscale adjustment and frequency-tuned saliency algorithm combined with the salient region mask obtained by dilation and differential operation to eliminate the background noise and extract defect areas. Meanwhile the directional feature matching and merging algorithm is applied to enhance directional features and retain details of defects. Testing images are captured by our established detecting system. Experimental results show that our method can retain defect information completely and achieve considerable extracting efficiency and detecting accuracy.
{"title":"Defect detection method for complex surface based on human visual characteristics and feature extracting","authors":"Yubin Du, Pin Cao, Yongying Yang, Fanyi Wang, Rongzhi Liu, Fan Wu, Pengfei Zhang, Huiting Chai, Jiabin Jiang, Yihui Zhang, Guohua Feng, Xiang Xiao, Yanwei Li","doi":"10.1117/12.2511490","DOIUrl":"https://doi.org/10.1117/12.2511490","url":null,"abstract":"Aimed at the problem of strong background interference introduced in digital image processing from complex surfaces under industrial defect detection, a method for complex surface defect detection based on human visual characteristics and feature extracting is proposed. Inspired by the visual attention mechanism, defect areas can be identified from the background noise conveniently by human eyes. We introduce the improved grayscale adjustment and frequency-tuned saliency algorithm combined with the salient region mask obtained by dilation and differential operation to eliminate the background noise and extract defect areas. Meanwhile the directional feature matching and merging algorithm is applied to enhance directional features and retain details of defects. Testing images are captured by our established detecting system. Experimental results show that our method can retain defect information completely and achieve considerable extracting efficiency and detecting accuracy.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116848842","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}
Lin Jiang, Jingzhi Huang, Xiangshuai Ding, Xiangzhang Chao
To obtain the accurate evaluation of minimum zone sphericity, this paper investigates a method in Cartesian coordinates using cuckoo search (CS) algorithm. In this method, an appropriate space is set as the search zone according to the solution obtained which is based on least square criteria. The aim of search is to find the best candidate position infinitely approximating the ideal reference center of minimum zone sphere. In order to improve the search efficiency, two essential parameters in CS, namely the control coefficient α of step size and the probability pa of discovering an invasive cuckoo's egg are set to 0.618 (value of golden ratio) and 0.05 (common value of statistical significance), respectively. The updating of the candidate points is carried out by Levy flights and biased/selective random walk mechanisms. Levy flights mechanism can ensure the real global optimum is not missed, biased/selective random walk mechanism guarantee the diversity of search direction and adaptability of search step size. During the updating, the new solution can be kept when it is better than the old one. In each search iteration, the position which corresponds to the smallest sphericity is regarded as the present optimum solution. When the iteration terminal condition is satisfied, the optimum position and corresponding sphericity are output as evaluation results. The validness of the proposed CS algorithm was tested by an application example, the results indicate that the proposed method has the advantage of excellent convergence and high efficiency, which is suitable for the hith-precision evaluation of minimum zone sphericity efficiently.
{"title":"Method for spherical form error evaluation using cuckoo search algorithm","authors":"Lin Jiang, Jingzhi Huang, Xiangshuai Ding, Xiangzhang Chao","doi":"10.1117/12.2513585","DOIUrl":"https://doi.org/10.1117/12.2513585","url":null,"abstract":"To obtain the accurate evaluation of minimum zone sphericity, this paper investigates a method in Cartesian coordinates using cuckoo search (CS) algorithm. In this method, an appropriate space is set as the search zone according to the solution obtained which is based on least square criteria. The aim of search is to find the best candidate position infinitely approximating the ideal reference center of minimum zone sphere. In order to improve the search efficiency, two essential parameters in CS, namely the control coefficient α of step size and the probability pa of discovering an invasive cuckoo's egg are set to 0.618 (value of golden ratio) and 0.05 (common value of statistical significance), respectively. The updating of the candidate points is carried out by Levy flights and biased/selective random walk mechanisms. Levy flights mechanism can ensure the real global optimum is not missed, biased/selective random walk mechanism guarantee the diversity of search direction and adaptability of search step size. During the updating, the new solution can be kept when it is better than the old one. In each search iteration, the position which corresponds to the smallest sphericity is regarded as the present optimum solution. When the iteration terminal condition is satisfied, the optimum position and corresponding sphericity are output as evaluation results. The validness of the proposed CS algorithm was tested by an application example, the results indicate that the proposed method has the advantage of excellent convergence and high efficiency, which is suitable for the hith-precision evaluation of minimum zone sphericity efficiently.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117213013","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}
T. Guo, Zhenshan Sun, Jinping Chen, Xing Fu, Xiaotang Hu
As the ultra-precision machining technology is developing in various directions and evolving into a higher level, the micro-nano measurement technology is also developing constantly. According to the different manufacturing processes and texture of measurement objects, the requirements of micro-nano measurement technology vary a lot. Optical Microscopy (OM), Scanning Probe Microscopy (SPM) or Scanning Electron Microscopy (SEM) cannot meet requirements of high efficiency, high resolution and three-dimensional morphology characteristics obtaining at the same time. Hence a hybrid measuring system including the Atomic Force Microscopy (AFM) and vertical scanning white-light interferometry is built. The measurement function of the dual feedback AFM system was verified by scanning a one-dimensional grid and the measurement function of white light vertical scanning interferometer was verified by measuring the step structure and comparing it with a three-dimensional optical profiler. And then the micro-arrayed structure is measured by white light vertical scanning interferometry. The vertices of the micro-arrayed unit structure is scanned by using AFM in the same coordinate system to verify the complex measurement function of the system on the complex micro-arrayed surface.
{"title":"Development of hybrid measuring system for the complex micro-arrayed surface","authors":"T. Guo, Zhenshan Sun, Jinping Chen, Xing Fu, Xiaotang Hu","doi":"10.1117/12.2509357","DOIUrl":"https://doi.org/10.1117/12.2509357","url":null,"abstract":"As the ultra-precision machining technology is developing in various directions and evolving into a higher level, the micro-nano measurement technology is also developing constantly. According to the different manufacturing processes and texture of measurement objects, the requirements of micro-nano measurement technology vary a lot. Optical Microscopy (OM), Scanning Probe Microscopy (SPM) or Scanning Electron Microscopy (SEM) cannot meet requirements of high efficiency, high resolution and three-dimensional morphology characteristics obtaining at the same time. Hence a hybrid measuring system including the Atomic Force Microscopy (AFM) and vertical scanning white-light interferometry is built. The measurement function of the dual feedback AFM system was verified by scanning a one-dimensional grid and the measurement function of white light vertical scanning interferometer was verified by measuring the step structure and comparing it with a three-dimensional optical profiler. And then the micro-arrayed structure is measured by white light vertical scanning interferometry. The vertices of the micro-arrayed unit structure is scanned by using AFM in the same coordinate system to verify the complex measurement function of the system on the complex micro-arrayed surface.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114888469","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}
Press-fit assembly is one of the traditional methods for assembly of interference fitting parts, but the assembly quality cannot be acquired directly from this method. At present, the press-fit curve is employed for quality estimation, and thickwalled cylinder theory (TCT) is used for standard press-fit curve prediction. However, the evaluation results cannot predict the stress concentration occurred on the mating surface, and most interference fitting parts fail due to this reason. This paper aims to explore ultrasound as a tool for non-destructive evaluation of contact stress, and then acquire the contact stress distribution eventually. Therefore, it is more convenient and intuitive to evaluate the assembly quality based on this method.
{"title":"Ultrasonic characteristics of contact stress of small interference fitting parts","authors":"Yue Wang, Z. Lou, Xingyuan Wang, Xiao-dong Wang","doi":"10.1117/12.2512438","DOIUrl":"https://doi.org/10.1117/12.2512438","url":null,"abstract":"Press-fit assembly is one of the traditional methods for assembly of interference fitting parts, but the assembly quality cannot be acquired directly from this method. At present, the press-fit curve is employed for quality estimation, and thickwalled cylinder theory (TCT) is used for standard press-fit curve prediction. However, the evaluation results cannot predict the stress concentration occurred on the mating surface, and most interference fitting parts fail due to this reason. This paper aims to explore ultrasound as a tool for non-destructive evaluation of contact stress, and then acquire the contact stress distribution eventually. Therefore, it is more convenient and intuitive to evaluate the assembly quality based on this method.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123387225","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}
As the basic element of a road, road edges are of great significance for intelligent transportation and urban foundational geographic information construction. Mobile laser scanning (MLS) provides an effective way to extract road information, but it is difficult to extract accurate road edges from a large-scale dataset with complex road conditions. In this paper, we propose a method to extract road edges from MLS data based on a local planar fitting algorithm. First, scanning lines are extracted based on the horizontal projection distance between the laser points. Second, a planar fitting method is adopted to extract road curb points. Road curb points are then clustered and optimized by differentiating the distance between road curb points and the auxiliary line. Finally, a linear least squares fitting method is applied to obtain the road edges. Three experimental datasets with multi-type road markings were used to evaluate the performance of the proposed method. The results demonstrate the feasibility and effectiveness of the proposed method.
{"title":"Extracting road edges from MLS point clouds via a local planar fitting algorithm","authors":"Jingzhong Xu, Ge Wang, Lina Ma, Jiarong Wang","doi":"10.1117/12.2511423","DOIUrl":"https://doi.org/10.1117/12.2511423","url":null,"abstract":"As the basic element of a road, road edges are of great significance for intelligent transportation and urban foundational geographic information construction. Mobile laser scanning (MLS) provides an effective way to extract road information, but it is difficult to extract accurate road edges from a large-scale dataset with complex road conditions. In this paper, we propose a method to extract road edges from MLS data based on a local planar fitting algorithm. First, scanning lines are extracted based on the horizontal projection distance between the laser points. Second, a planar fitting method is adopted to extract road curb points. Road curb points are then clustered and optimized by differentiating the distance between road curb points and the auxiliary line. Finally, a linear least squares fitting method is applied to obtain the road edges. Three experimental datasets with multi-type road markings were used to evaluate the performance of the proposed method. The results demonstrate the feasibility and effectiveness of the proposed method.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125895316","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}
Heterodyne interferometer is a nanometer measurement system that uses the laser wavelength as the working reference for length measurement. Under ideal conditions, the laser wavelength is the wavelength λ0 of the light wave in the vacuum, but in practical applications, the laser wavelength will change with the influence of the air refractive index and the refractive index of air is greatly affected by the environment. This will have a great influence on the measurement results of the high-precision and high-resolution nano-displacement measurement system. Therefore, it is necessary to correct the air refractive index to compensate the laser wavelength. In this paper, the air refractive index in the initial measurement is obtained by using the Edlen empirical formula. Then the relationship between the current air refractive index and the initial air refractive index is obtained by using the wavelength compensation unit to achieve the automatic real-time compensation of the wavelength. The wavelength compensation component is mainly composed of an interference mirror and a fixed length etalon. Through the measurement of air refractive index and the experiment of compensation, the feasibility of the method is confirmed. The relative error after wavelength compensation is less than 0.03% relative to the relative error before compensation.
{"title":"Automatic real-time compensation of wavelength of heterodyne interferometer","authors":"Wei Jin, Qi Li, Yu-shu Shi, S. Gao, Wei Li, S. Li","doi":"10.1117/12.2512162","DOIUrl":"https://doi.org/10.1117/12.2512162","url":null,"abstract":"Heterodyne interferometer is a nanometer measurement system that uses the laser wavelength as the working reference for length measurement. Under ideal conditions, the laser wavelength is the wavelength λ0 of the light wave in the vacuum, but in practical applications, the laser wavelength will change with the influence of the air refractive index and the refractive index of air is greatly affected by the environment. This will have a great influence on the measurement results of the high-precision and high-resolution nano-displacement measurement system. Therefore, it is necessary to correct the air refractive index to compensate the laser wavelength. In this paper, the air refractive index in the initial measurement is obtained by using the Edlen empirical formula. Then the relationship between the current air refractive index and the initial air refractive index is obtained by using the wavelength compensation unit to achieve the automatic real-time compensation of the wavelength. The wavelength compensation component is mainly composed of an interference mirror and a fixed length etalon. Through the measurement of air refractive index and the experiment of compensation, the feasibility of the method is confirmed. The relative error after wavelength compensation is less than 0.03% relative to the relative error before compensation.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125923136","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}
Xiao-dong Wang, Xingyuan Wang, T. Ren, Yue Wang, Z. Lou, Yi Luo
Measurement is the prerequisite technology for assembling precise devices in order to guarantee the quality requirements. As a typical category of assembly, peg-in-hole is the most widely employed assembly method in industrial fields, including precision instruments and machinery. Some of the measurement problems and solutions of two major categories of the peg-in-hole assembly, i.e. clearance fits and interference fits, were discussed. The parts to be assembled are small in size. The precision clearance fits require mating surfaces to avoid collisions during assembly; for the precision interference fits, the mating surfaces should not be damaged or generating abrasive chips during press-fit. The hole-shaft alignment and attitude adjustment are the main task need to be carried out precisely in assembly. Furthermore, real-time monitoring and connection strength measurement is also the important for interference fit assembly. Therefore, the purpose of this paper is to achieve precise hole-shaft alignment and attitude adjustment of these two kinds of fits and to real-time monitor the assembly process, as well as connection strength assessment of the interference fit. Two assembly instruments were built for interference fits and clearance fits to achieve precise alignment, attitude adjustment, and real-time monitoring. In addition, an ultrasonic testing apparatus was built to evaluate the connection strength. After calibration, the precision press-fit instrument can achieve high assembly accuracy and demonstrated with experiments. The prediction results of connection strength are in good agreement with experimental results with a relative error less than 20%. Furthermore, the instrument for clearance fits was also designed and introduced.
{"title":"The measurement technology for precision peg-in-hole assembly","authors":"Xiao-dong Wang, Xingyuan Wang, T. Ren, Yue Wang, Z. Lou, Yi Luo","doi":"10.1117/12.2512439","DOIUrl":"https://doi.org/10.1117/12.2512439","url":null,"abstract":"Measurement is the prerequisite technology for assembling precise devices in order to guarantee the quality requirements. As a typical category of assembly, peg-in-hole is the most widely employed assembly method in industrial fields, including precision instruments and machinery. Some of the measurement problems and solutions of two major categories of the peg-in-hole assembly, i.e. clearance fits and interference fits, were discussed. The parts to be assembled are small in size. The precision clearance fits require mating surfaces to avoid collisions during assembly; for the precision interference fits, the mating surfaces should not be damaged or generating abrasive chips during press-fit. The hole-shaft alignment and attitude adjustment are the main task need to be carried out precisely in assembly. Furthermore, real-time monitoring and connection strength measurement is also the important for interference fit assembly. Therefore, the purpose of this paper is to achieve precise hole-shaft alignment and attitude adjustment of these two kinds of fits and to real-time monitor the assembly process, as well as connection strength assessment of the interference fit. Two assembly instruments were built for interference fits and clearance fits to achieve precise alignment, attitude adjustment, and real-time monitoring. In addition, an ultrasonic testing apparatus was built to evaluate the connection strength. After calibration, the precision press-fit instrument can achieve high assembly accuracy and demonstrated with experiments. The prediction results of connection strength are in good agreement with experimental results with a relative error less than 20%. Furthermore, the instrument for clearance fits was also designed and introduced.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126035804","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}
Particle charging is a universal phenomenon due to the collision and contact between particle and particle, particle and wall in the powder pneumatic conveying process. The linear electrostatic sensor matrix (LESM) is able to capture the dynamic information of the moving charged particles in pipeline, whose spatial filtering characteristics has been employed to obtain the flow velocity of particles in gas-solid flow. The spatial filtering characteristics of LESM are closely related to its dynamic sensitivity (DS) distribution. In this paper, the 3D simulated model of the LESM was built by finite element method and the effects of its structural parameters on its dynamic sensitivity and spatial filtering characteristics were studied. The geometric dimensionless model of dynamic sensitivity of LESM was further established. Finally the experiment was carried out on a gravity-fed solids flow rig, and the experimental results was verified the simulation results.
{"title":"Dynamic sensitivity distribution of linear electrostatic sensor matrix","authors":"Heming Gao, B. Fan, H. Deng, Y. Min, Jun Liu","doi":"10.1117/12.2511097","DOIUrl":"https://doi.org/10.1117/12.2511097","url":null,"abstract":"Particle charging is a universal phenomenon due to the collision and contact between particle and particle, particle and wall in the powder pneumatic conveying process. The linear electrostatic sensor matrix (LESM) is able to capture the dynamic information of the moving charged particles in pipeline, whose spatial filtering characteristics has been employed to obtain the flow velocity of particles in gas-solid flow. The spatial filtering characteristics of LESM are closely related to its dynamic sensitivity (DS) distribution. In this paper, the 3D simulated model of the LESM was built by finite element method and the effects of its structural parameters on its dynamic sensitivity and spatial filtering characteristics were studied. The geometric dimensionless model of dynamic sensitivity of LESM was further established. Finally the experiment was carried out on a gravity-fed solids flow rig, and the experimental results was verified the simulation results.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126368368","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}
T. Ren, B. Qin, Xiang-dong Xu, Zhi-rou Liu, Xiao-dong Wang
The size of internal air gap of dynamic pressure motor is an important index to determine its performance and running stability. In order to improve the precision and automation degree of the internal air gap measurement for dynamic pressure motor, an automatic measurement equipment was developed based on modular design concept. The equipment was mainly composed of clamping module, automatic forcing module, and displacement measurement module. During measurement, the stator was mounted by clamping module with a flexible support at two ends. Then an external force was loaded by forcing module, which was a 3-D electric precision motion platform integrating one triaxial force transducer. A relative displacement was generated because of the internal air gap. And the relative displacement increased until the rotor and stator touched each other. Thus the air gap was transformed into an external micro displacement. Finally, the displacement was measured by measurement module, a 2-D precision motion platform integrating double inductive probes, with relative measurement principle. Experimental results showed that the measurement accuracy was about 0.2μm.
{"title":"The internal air gap measurement equipment for dynamic pressure motor","authors":"T. Ren, B. Qin, Xiang-dong Xu, Zhi-rou Liu, Xiao-dong Wang","doi":"10.1117/12.2517302","DOIUrl":"https://doi.org/10.1117/12.2517302","url":null,"abstract":"The size of internal air gap of dynamic pressure motor is an important index to determine its performance and running stability. In order to improve the precision and automation degree of the internal air gap measurement for dynamic pressure motor, an automatic measurement equipment was developed based on modular design concept. The equipment was mainly composed of clamping module, automatic forcing module, and displacement measurement module. During measurement, the stator was mounted by clamping module with a flexible support at two ends. Then an external force was loaded by forcing module, which was a 3-D electric precision motion platform integrating one triaxial force transducer. A relative displacement was generated because of the internal air gap. And the relative displacement increased until the rotor and stator touched each other. Thus the air gap was transformed into an external micro displacement. Finally, the displacement was measured by measurement module, a 2-D precision motion platform integrating double inductive probes, with relative measurement principle. Experimental results showed that the measurement accuracy was about 0.2μm.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123228658","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, a quality detection method for battery FPC (Flexible Printed Circuit) connectors based on active shape model template matching is proposed. It can deal with different kinds of connector appearance defects. Firstly, construct template data set of connector, acquire test images and apply cutting operation to original image, then execute tilt correction and image reconstruction by means of least square method and affine transformation to fulfil the pre-processing stage. Then, match and locate connector region in per-processing image with the help of the active shape model (ASM) based template matching method. To deal with different kinds of defect (soldering offset/tilt, exposed copper clad layer in FPC, broken edge in FPC, defects in center area of connector, defects on metal and plastic components), independent detection algorithm units are integrated in the system. Template can also be real-timely updated according to detection result. Finally, the defects will be classified, located and marked in detection image. In addition, aimed at the need of battery industry, a set of detection system with low cost, high performance and strong stability has been designed. It can be concluded from online and offline experiments that the proposed method is of high detection rate, good real-time performance and strong robustness.
{"title":"Online vision system for battery FPC connector defect detection based on active shape model template matching","authors":"Zhu Zhao, Bing Li, Fei Gao, Lei Chen, Meiting Xin","doi":"10.1117/12.2511378","DOIUrl":"https://doi.org/10.1117/12.2511378","url":null,"abstract":"In this paper, a quality detection method for battery FPC (Flexible Printed Circuit) connectors based on active shape model template matching is proposed. It can deal with different kinds of connector appearance defects. Firstly, construct template data set of connector, acquire test images and apply cutting operation to original image, then execute tilt correction and image reconstruction by means of least square method and affine transformation to fulfil the pre-processing stage. Then, match and locate connector region in per-processing image with the help of the active shape model (ASM) based template matching method. To deal with different kinds of defect (soldering offset/tilt, exposed copper clad layer in FPC, broken edge in FPC, defects in center area of connector, defects on metal and plastic components), independent detection algorithm units are integrated in the system. Template can also be real-timely updated according to detection result. Finally, the defects will be classified, located and marked in detection image. In addition, aimed at the need of battery industry, a set of detection system with low cost, high performance and strong stability has been designed. It can be concluded from online and offline experiments that the proposed method is of high detection rate, good real-time performance and strong robustness.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"323 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123303191","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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