Out-of-plane light-scattering polarimetric imaging of a thread surface

doi:10.1016/j.optlaseng.2014.06.018

機構典藏 > College of Engineering > Graduate Institute & Department of Mechanical and Electro-Mechanical Engineering > Journal Article > Item 987654321/98323

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Title:	Out-of-plane light-scattering polarimetric imaging of a thread surface
Other Titles:	螺紋表面特徵的平面外散射光偏振成像研究
Authors:	Cheng-Yang Liu;Li-Jen Chang
Contributors:	機械與機電工程學系暨研究所
Keywords:	Light scattering;Bidirectional ellipsometry;Screw
Date:	2014-12
Issue Date:	2014-07-17 11:58:34 (UTC+8)
Publisher:	Elsevier Ltd
Abstract:	A novel polarimetric measurement based on hemispherical light-scattering for the assessment of superficial screw is presented. The optical system is capable of capturing polarized light images. The effect of the thread surface backscattering is estimated with the use of in-plane and out-of-plane illumination. The angular distributions of polarized light scattered by the ISO metric screws are measured for light incident from a green laser. A partial Stokes vector imaging detector is mounted on a motorized rotating arm at an oblique angle to the sample normal and consists of a 10-bit scientific camera, an object lens, and a polarizer. The partial Stokes vector images of light scattered towards the camera are generated for each direction and a useful decomposition of the partial Stokes vector is presented. The thread surface effects can be minimized using out-of-plane polarized illumination in conjunction with polarized images. The experimental result may provide a new polarized imaging technique for using visible light to inspect the key features of a screw in automated optical inspection system.
Relation:	Optics and Lasers in Engineering 63, pp.76-81
DOI:	10.1016/j.optlaseng.2014.06.018
Appears in Collections:	[Graduate Institute & Department of Mechanical and Electro-Mechanical Engineering] Journal Article

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