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《Optics and Precision Engineering》 2019-04
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Position measurement for linear motor mover based on aperiodic sinusoidal stripe image

ZHAO Ji-wen;GONG Kai-ge;ZHAO Jing;WANG Hui;JIANG Xu;School of Electrical Engineering and Automation,Anhui University;  
To improve the accuracy and anti-interference of the position detection of a linear motor mover from a target shooting source,an aperiodic sinusoidal stripe image was constructed and a subpixel measurement method based on the gradient method was introduced to achieve high-precision measurement of the mover position.First,by changing the stripe cycle of the sinusoidal stripe,an aperiodic sinusoidal stripe image was generated.Second,an aperiodic sinusoidal stripe image with strong robustness was selected by using the Pnatt entropy of the image.Finally,the subpixel displacement of the adjacent target image was calculated using the gradient method based on the Barron operator,and the actual displacement of the linear motor mover was obtained by combining the calibration coefficients of the calibration system.Simulation and experimental results show that when compared to the aperiodic fence image,the aperiodic sinusoidal stripe image has strong robustness and a measurement accuracy of 0.02 pixels.
【Fund】: 国家自然科学基金资助项目(No.51837001 No.51707002 No.51637001 No.51577001);; 安徽省教育厅项目资助(No.KJ2017A003);; 安徽省自然科学基金项目资助(No.1808085QE123)
【CateGory Index】: TP391.41;TM359.4
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