323 Improvement of Temperature Induced Measuring Error in the Positioning Error Measurement of the Ultra Precision Stages
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概要
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The heterodyne He-Ne laser interferometer is the most widely used system to measure the position error. It measures the positioning error from the displacement of a moving reflector in terms of the wave length. But, the wave length is affected by the variation of atmospheric temperature. Temperature variation of 1℃ results in the measuring error of 1ppm. In this paper, for measuring the position error of the ultra precision stage more accurately, the refractive index compensation method is introduced. The wave length of the laser interferometer is compensated using the simultaneously measured the variation of room temperature in the method. In order to investigate the limit of compensation, the stationary test against two fixed reflectors mounted on the zerodur plate is performed firstly. From the experiment, it is confirmed that the measuring error of the laser interferometer can be improved from 0.34μm to 0.11μm by the application of the method. Secondly, for the verification of the compensating effect, it is applied to estimate the positioning accuracy of a ultra precision aerostatic stage. Two times of the refractive index compensation are performed to acquire the positioning error of the stage from the initially measured data, that is, to the initially measured positioning error and to the measured positioning error profile after the NC compensation. Although the positioning error of the aerostatic stage cannot be obtained clearly, it is known that by the compensation method, the measuring error in the laser interferometer can be improved to within 0.1μm in the practical measurement on ultra precision stage.
- 一般社団法人日本機械学会の論文
著者
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Kim S.
Department Ob
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Park C.
Machine Tools Group Department Of Intelligence And Precision Machine Korea Institute Of Machinery An
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Hwang J.
Machine Tools Group, Department of Intelligence and Precision Machine, Korea Institute of Machinery
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Lee C.
Machine Tools Group, Department of Intelligence and Precision Machine, Korea Institute of Machinery
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Kim S.
Department Of Mechanical Engineering Korea Advanced Institute Of Science And Technology
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Lee C.
Machine Tools Group Department Of Intelligence And Precision Machine Korea Institute Of Machinery An
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