[OPTICAL REVIEW Vol. 9, No. 4 (2002) 159-162]

Measurement of Sectional Profile of a Cylinder using a Sinusoidally Vibrating Light with Sinusoidal Intensity

Jinhuan LI, Osami SASAKI and Takamasa SUZUKI

Faculty of Engineering, Niigata University, Niigata 950-2181, Japan

(Received April 15, 2002; Accepted May 24, 2002)

A method for accurately measuring a sectional profile of a cylinder is proposed in which a sinusoidally vibrating sinusoidal grating is used to generate a sinusoidally vibrating sinusoidal intensity distribution. A light coming from the top point of the cylinder surface is extracted with an optical system to make an image of this point. A sectional profile of the cylinder is measured by detecting a phase of a time-varying signal contained in the image intensity at a position where the amplitude of the signal is maximum. Detection of the amplitude and the phase is carried out easily and exactly.

Key words: grating, sinusoidal phase-modulation, sectional profile, optical imaging

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