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Proceedings Paper

Measurement of diameter of metal cylinders using a sinusoidally vibrating interference pattern
Author(s): Jinhuan Li; Osami Sasaki; Takamasa Suzuki
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Paper Abstract

A method for measuring diameters of metal cylinders is proposed. In this method a sinusoidally vibrating interference pattern (SVIP) of 100μm-period is used to generate an exact spatial scale along x-axis. Detection of the amplitude and the phase of the SVIP are carried out easily and exactly with sinusoidal phase-modulating interferometry. First, phase values of the SVIP on the pixels of the CCD image sensor are measured as the exact scale along the x-axis. Next, an image of the end-points of the cylinder surface is formed by extracting lights from the end-points of the cylinder. The phase of the SVIP on the end-point of the cylinder appears at a position where the amplitude of the image has maximum value along the x-axis. The x-coordinate of the end-point of the metal cylinder is calculated from the phase value of the end-point and the exact scale. The diameter is obtained from the x-coordinates of the two end-points. Metal cylinders of 9mm and 8mm-diameters are measured with an error of about ±2μm.

Paper Details

Date Published: 9 December 2005
PDF: 6 pages
Proc. SPIE 6024, ICO20: Optical Devices and Instruments, 60240Q (9 December 2005); doi: 10.1117/12.666832
Show Author Affiliations
Jinhuan Li, Niigata Univ. (Japan)
Osami Sasaki, Niigata Univ. (Japan)
Takamasa Suzuki, Niigata Univ. (Japan)

Published in SPIE Proceedings Vol. 6024:
ICO20: Optical Devices and Instruments
James C. Wyant; X. J. Zhang, Editor(s)

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