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Measurements of flow velocity in a microscopic region using a transmission grating: a practical velocimeter

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Abstract

This paper reports a practical differential-type transmission-grating velocimeter system for measuring the flow velocity in a microscopic region. This practical velocimeter is constructed with a useful optical system and an improved signal-analyzing system; it is used for measurements of the flow velocity in a biological field. The velocimeter also measures moving rough surfaces in a small probe area. The experimental results show the applicability of the transmission-grating velocimeter to measurements of blood flow velocity and to the velocities of various moving rough surfaces in a microscopic region.

© 1986 Optical Society of America

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