Fractional Fringe Order Method Using Fourier Analysis for Absolute Measurement of Block Gauge Thickness |
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Authors: | Minghong Tsai Hongxin Huang Masahide Itoh Toyohiko Yatagai |
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Affiliation: | (1) Institute of Applied Physics, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8573, Japan |
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Abstract: | A fringe analysis method, which combines the Fourier transform with the fractional fringe order method for measuring the absolute thickness of a block gauge, is presented. An approximate integer part of the fringe order is estimated by mechanical measurements, and the fractional part is determined by Fourier analysis of the interferometric fringe patterns. The fringe patterns are obtained with a Michelson interferometer by illumination of several selected wavelengths, respectively. The use of the fractional fringe order method can determine accurately more than 2ϖ phase jumps. The measured thickness of a block gauge is 5999115.0 ± 0.7 nm, which is comparable with the standard thickness of 6 mm. The influence of wavelength and approximate integer part of fringe order on the measurement accuracy is discussed. |
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Keywords: | absolute measurement fractional fringe order method excess fraction Fourier transformation block gauge 2ϖ ambiguity |
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