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A dispersion interferometer is free from mechanical vibrations, which cause measurement errors. Hence, a vibration compensation system is not required and the interferometer is suitable for future large fusion reactors. We propose a combination of phase modulation and the use of a ratio of modulation amplitudes for phase extraction to improve the phase resolutions, which are evaluated during bench testing. The design of the optical system for the Large Helical Device is shown.
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Akiyama et al. (2012) studied this question.
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