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Whole field surface roughness measurement by laser speckle correlation technique

✍ Scribed by S.L. Toh; C. Quan; K.C. Woo; C.J. Tay; H.M. Shang

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
454 KB
Volume
33
Category
Article
ISSN
0030-3992

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✦ Synopsis

This paper describes a speckle correlation technique for the determination of surface roughness, ranging from 1.6 to 50 m. Instead of moving the laser beam, the specimen is rotated to achieve angular speckle correlation (ASC) in the far-ΓΏeld plane. The technique is simple and requires minimum optical alignment. The experimental results show a good agreement with the standard specimen of known roughness. An error analysis on the experiment has been carried out. Together with the theoretical curves, the roughness values can be easily related to the change of incidence angle at a particular visibility of the correlation fringes between two speckle patterns.

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Whole field measurement of surface rough
Whole field measurement of surface roughness using laser speckle
✍ C.J. Tay; S.L. Toh; H.M. Shang; J.B. Zhang πŸ“‚ Article πŸ“… 1993 πŸ› Elsevier Science 🌐 English βš– 426 KB

## Industrial snmm~ry The importance of accurate measurements of the surface roughness of products can never be over-emphasised, for instance, the design and manufacture of moulds and dies is never complete without their surface roughness being specified and measured. The surface finish of product