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| Out-plane Error and Correction in Measurement Using Video Extensometer |
| CHAI Xing-hua1,ZHANG Jing2,CHEN Xin1,ZHOU Fu-qiang1 |
1. School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China
2. Computer Department, Xinzhou Teachers University, Xinzhou, Shanxi 034000, China |
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Abstract These errors of video extensometer are analyzed from the aspects of mechanical assembly, external vibration, and image processing. In addition, the out-plane error is analyzed in details and the correction method is proposed. To evaluate the performance of the correction method, real experiments were performed. The results showed the errors can be reduced by the optimization algorithm, and the relative accuracy can be maintained at 0.5%, which achieved the extensometer classification of 0.5 level.
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Received: 16 August 2016
Published: 27 September 2017
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2017, Vol. 38 
