Measurement of bubble diameter in a prism based on far-field interference
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1.
Department of Physics, Hebei North University, Zhangjiakou 075000, China;
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2.
Department of Machine, Hebei Institute of Architectural Civil Engineering, Zhangjiakou 075024, China
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Received Date:
2008-11-20
Accepted Date:
2009-04-13
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Abstract
In order to measure bubble diameter in transparent solid materials, the bubble diameter in the prism is measured by means of far-field interference. When parallel laser beam is irradiating the bubble in the prism, circular interference fringe is produced in the far-field. It is analyzed based on the far-field theoretical model. The interference fringes outside the prism is measured with spectrometer and a set of data of angle position of interference fringes is obtained and converted into the angle position of interference fringes inside the prism according to Snell's law and then bubble diameter is calculated with computing software MATHEMATICA. The results showed that the relative error is 0.2%,the measured diameter direction is incident laser beam direction and the demand for the bubble location over platform is not strict. When appropriate change in measurement method is made,the bubble diameter of transparent medium in other shape can also be measured. The result is helpful for studying the shape of the bubble in a transparent material.
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