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  • 2006 [1]
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Grating interferometry method for torsion measurement (EI CONFERENCE) 会议论文  OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者:  Liu W.
收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25
Method of grating interferometry was presented for torsion angle measurement  moire fringe generated by two gratings is used in a new field  it breaks through moire fringe's routine application. Measurement principle is described  torsion angle can be gotten by the tilt angle or the width of moire fringe. Different from moire fringe's characteristic information extracting methods in traditional measurement fields  fringe-tilt method and fringe-width method were put forward to extract moire fringe's characteristic information. Fringe-tilt method is on the basis of moire fringe's tilt to acquire torsion angle  uniform formula was built aiming at all positions of two gratings in the coordinates  fringe-width method is on the basis of moire fringe's width to acquire torsion angle  three key problems are given about fringe-width method. Thick  middle and thin moire fringe were collected in experiments and processed by two methods  fringe-width method's result shows that magnitude of boat torsion error is satisfied with that of theoretical precision analysis  and the change rule of torsion error is also same to that of theoretical analysis  the thicker fringe is  the higher precision is  when fringe width arrives to be 1695m  the precision is 1.7"  the thinner fringe is  the lower precision is  when fringe width arrives to be 734.7m  the precision is 6.7". In addition to these  the results of repeatability experiments  sensibility experiments are given. In a word  the measurement principle is right and the precision of fringe processing is also reliable.