Abstract
In this work, a new method to determine the interference grade of the central film is put forward. The interference figure is generated on a steel ball and a glass disc with a green monochromatic two-beam interferometry. With gradually increasing the rotational speed of the glass disc, the corresponding interference intensities of the central contact area are continually collected and sent to the computer. With these data, the periodical curve of the central interference grey value with the sliding speed has been drawn. Then, the curve is compared with the theoretical result so that the central interference grade of each figure can be determined. It has been found that while the sliding speed varies from 0.09 m/s to 0.21 m/s, the central interference grade of the interference figure is the first under the working conditions of the present paper. As the sliding speed increases between 0.21 m/s and 0.4 m/s, the second grade of the central interference figure is achieved. As the central interference grade has been known, the film thickness and the film shape can be easily determined by the interference picture of the EHL film and the relative optical intensity principle.
Published Version
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