Development of optical noncontact sensor for measurement of  three-dimensional profiles using depolarized components of scattered   light

Kanji Mashimo; Tetsuya Nakamura; Yoshihisa Tanimura

doi:10.1117/1.601164

1 January 1997 Development of optical noncontact sensor for measurement of three-dimensional profiles using depolarized components of scattered light

Kanji Mashimo, Tetsuya Nakamura, Yoshihisa Tanimura

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Optical Engineering, Vol. 36, Issue 1, (January 1997). https://doi.org/10.1117/1.601164

A new optical noncontact sensor is proposed for measuring profiles of an object with 3-D free-form surfaces. The sensor consists of both low-resolution and high-resolution optical systems. Two linearly polarized laser beams from the sensor are focused on the object surface to be measured. Some of the depolarized components of light scattered from the object surface, i.e., the polarized components orthogonal to those of the incident beams, are detected to exclude specularly reflected light. The triangulation method is applied to the low-resolution optical system, which can be used to detect a wide range of height. The astigmatic focus error method is applied to the high-resolution optical system to detect the focused positioning signal of the object surface more precisely than with the low-resolution system. Using a measuring instrument fabricated with the new optical noncontact sensor, 3-D profiles of diffuse reflection surfaces and metal surfaces on which both specular reflection and diffuse reflection occur can be measured. Adverse effects of surface roughness, scratches, and diffraction on measurements can be reduced.

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Kanji Mashimo, Tetsuya Nakamura, and Yoshihisa Tanimura "Development of optical noncontact sensor for measurement of three-dimensional profiles using depolarized components of scattered light," Optical Engineering 36(1), (1 January 1997). https://doi.org/10.1117/1.601164

Published: 1 January 1997

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