Determination of the central position of rotation of a rotating object by laser Doppler velocimetry

Tomoaki Eiju; Kiyofumi Matsuda

doi:10.1117/12.55982

1 November 1991 Determination of the central position of rotation of a rotating object by laser Doppler velocimetry

Tomoaki Eiju, Kiyofumi Matsuda

Author Affiliations +

Optical Engineering, Vol. 30, Issue 11, (November 1991). https://doi.org/10.1117/12.55982

Abstract

New methods to determine the central position of rotation of a rotating object using laser Doppler velocimetry (LDV) are described. The principle is based on the fact that the tangential velocity of the rotating object is proportional to the distance from the center of rotation and that it can be measured by LDV with a microscope optical system. To realize this principle, three methods (angular and tangential velocity method, multiple-point method, and two-point method) are proposed. In the third method, a holographic optical element was used to play the role of multiple beamsplitter and a lens to obtain a rigid and simple optical system. From experimental results, it has been indicated that the position of the center of rotation is determined with an accuracy of 1 to 2 μm by these methods.

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Tomoaki Eiju and Kiyofumi Matsuda "Determination of the central position of rotation of a rotating object by laser Doppler velocimetry," Optical Engineering 30(11), (1 November 1991). https://doi.org/10.1117/12.55982

Published: 1 November 1991

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