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This article proposes a laser-induced surface displacement detection instrument for measuring the viscosity of liquid. The features of this instrument can obtain the absolute value of timeresolved surface displacement with an adjusted-free and non-calibration. The constitution method of our proposed apparatus and its trial prototype are shown, and experimental results are demonstrated. Finally, our proposed scheme that estimates liquid viscosity is described briefly.doi:10.5162/imcs2018/p2em.1 fatcat:zdvqyxzwrfajjgdzs5b6bsmakm