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Vol. 158, Issue 11, November 2013, pp. 236-241

 

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Automatic Measurement and Control Method for the Code Edge of Stripe Rod
 
Min ZHAO, Zongming QIU

School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China
Tel.: +86-029-8231 2861, fax: +86-029-8231 2677
E-mail: zhaomin1973@xaut.edu.cn

 

Received: 3 September 2013   /Accepted: 25 October 2013   /Published: 30 November 2013

Digital Sensors and Sensor Sysstems

 

Abstract: It is a tough question to measure the code edges of the stripe rod with high precision and high efficiency. An automatic measurement and control method for the code edges of the stripe rod is put forward in the paper. A laser interferometer is used not only as a means in distance measurement but also as a positioning sensor in closed-loop control. The acceleration-deceleration control of S curve is designed to ensure the system performance. An alignment area is set up to provide control redundancy and the alignment offset of measured edge can be obtained by image measurement. The measured code edge position is obtained by combining interferometer data with image data. The S curve control proves high efficiency and positioning precision of 0.03 mm. The repetition criterion deviation of edge measurement is less than 0.5 mm, which proves the data combination method is high precision. This is the first time that closed-loop control and control redundancy method is used to calibrate the stripe rod.

 

Keywords: Code edge, Automatic measurement, Motion control, S curve.

 

 

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